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GPS

4303/ 4251/ 3303/ 2303


Verification/ Adjustment Manual




GPS-4303/ 4251/ 3303/ 2303
Table of Contents




Table of Contents

How to Use this Manual................................................ 4

Specification............................................................... 5

Front Panel ................................................................ 7

Performance Verification .............................................. 9
Overall Procedure............................................................ 9
Verification Equipment ..................................................... 9
Output Voltage Verification ..............................................10
Tracking Series Voltage Verification ...................................12
Output Current Verification ..............................................14
Tracking Parallel Current Verification .................................16
Current Load Regulation Verification .................................18
Ripple Current Verification ...............................................20
Voltage Load Regulation Verification..................................22
Tracking Series Load Regulation/ Ripple Verification ............24
Ripple Voltage Verification ...............................................26
Recording Tables ............................................................28

Adjustment ...............................................................31
Overall Procedure...........................................................31
Adjustment Equipment....................................................31
Opening the Case...........................................................32
Adjustment Point ...........................................................33
Output Voltage Adjustment..............................................37
Tracking Series Voltage Adjustment ..................................40
Output Current Adjustment .............................................42
Tracking Parallel Current Adjustment.................................44
Overload Indicator Adjustment.........................................46



3
GPS Verification/ Adjustment Manual




How to Use this Manual
This manual describes how to verify and adjust the performance of
GPS-4303/ 4251/ 3303/ 2303 Multiple Output D.C. Power Supplies.

Specification, page5, shows GPS electronic and mechanical specifications.
It also shows the locations of relevant verification and adjustment
procedures in this manual.

Front Panel, page7, describes the front panel switches, terminals, and
indicators. The Default Settings column shows the basic panel settings
applicable to all verification and adjustment items.

Performance Verification, page9, shows how to verify GPS performance,
step by step. Check the necessary equipment and the overall procedure
before start working on each item.

Adjustment, page31, shows how to adjust GPS specification. Same as
Performance Verification, check the equipment and the overall procedure
before start working on each item.




4
Specification




Specification
GPS-4303
Output Mode CH1, 2 CH3 CH4 Verification Adjustment
Voltage 0 ~ 30V 2.2 ~ 5.2V 8 ~ 15V Page10 Page37
Current 0 ~ 3A 1A Max. 1A Max. Page14 Page42
Tracking Series
0 ~ 60V --- --- Page12 Page40
Voltage
Tracking Parallel
0 ~ 6A --- --- Page16 Page44
Current
GPS-4251
Output Mode CH1, 2 CH3 CH4 Verification Adjustment
Voltage 0 ~ 25V 3 ~ 6V 8 ~ 15V Page10 Page37
Current 0 ~ 0.5A 2.5A Max. 1A Max Page14 Page42
Tracking Series
0 ~ 50V --- --- Page12 Page40
Voltage
Tracking Parallel
0 ~ 1A --- --- Page16 Page44
Current
GPS-3303
Output Mode CH1, 2 CH3 CH4 Verification Adjustment
Voltage 0 ~ 30V 5V Fixed --- Page10 Page37
Current 0 ~ 3A 3A Max. --- Page14 Page42
Tracking Series
0 ~ 60V --- --- Page12 Page40
Voltage
Tracking Parallel
0 ~ 6A --- --- Page16 Page44
Current
GPS-2303
Output Mode CH1, 2 CH3 CH4 Verification Adjustment
Voltage 0 ~ 30V --- --- Page10 Page37
Current 0 ~ 3A --- --- Page14 Page42
Tracking Series
0 ~ 60V --- --- Page12 Page40
Voltage
Tracking Parallel
0 ~ 6A --- --- Page16 Page44
Current
(Continued on next page)




5
GPS Verification/ Adjustment Manual



Constant Voltage Operation (CH1, CH2) Verification Adjustment
Line Regulation 0.01% + 3mV --- ---
0.01% + 3mV (rating current 3A)
Load Regulation Page22 ---
0.02% + 5mV (rating current > 3A)
Ripple & Noise 1mVrms, 5Hz ~ 1MHz Page26 ---
100S (50% Load Change,
Recovery Time --- ---
Minimum Load 0.5A)
Constant Current Operation (CH1, CH2) Verification Adjustment
Line Regulation 0.2% + 3mA --- ---
Load Regulation 0.2% + 3mA Page18 ---
Ripple Current 3mArms Page20 ---
Tracking Operation (CH1, CH2) Verification Adjustment
Tracking Error 0.5%(CH1) + 10mV Page12 Page41
Series Regulation 300mV --- ---
Load Regulation 0.01% + 3mV Page24 ---
Ripple & Noise 2mVrms, 5Hz ~ 1MHz Page24 ---
CH3 Output Verification Adjustment
Line Regulation 5mV --- ---
Load Regulation 15mV Page22 ---
Ripple & Noise 2mVrms, 5Hz ~ 1MHz Page26 ---
CH4 Output Verification Adjustment
Line Regulation 5mV --- ---
Load Regulation 10mV Page22 ---
Ripple & Noise 2mVrms, 5Hz ~ 1MHz Page26 ---
Meter Verification Adjustment
Model 3 Digits, 0.5" LED display --- ---
Out ON Accuracy (0.5% rdg + 2 digits) Page10, 14 Page38, 43
(0.5% rdg + 8 digits) Page10, 12, Page39, 41,
Out OFF Accuracy
* GPS-2303: (0.5% rdg + 2 digits) 14, 16 43, 45
Insulation Verification Adjustment
Chassis and Terminal DC 500V/ 20M --- ---
Chassis and AC Cord DC 500V/ 30M --- ---
Power Source Verification Adjustment
AC 100V/ 120V/ 220V ( 10%)/ 230V (+10% ~ -6%), 50/ 60Hz --- ---
Dimensions & Weight Verification Adjustment
255(W) x 145(H) x 265(D) mm, 7kg *GPS-4251: 6.3kg --- ---




6
Front Panel




Front Panel




Description and Default Settings

Default GPS- GPS- GPS- GPS-
No Description
Settings 4303 4251 3303 2303
1 Power Switch ON * * * *
2 CH4 - Output Terminal * *
3 CH4 + Output Terminal * *
CH2 C.V./ C.C. Indicator
4 Green : Constant Voltage (C.V.) * * * *
Red : Constant Current (C.C.)

5 CH2 - Output Terminal * * * *
6 CH2 + Output Terminal * * * *
Connect to
7 GND Terminal * * * *
Ground
8 CH1 - Output Terminal Connected * * * *
9 CH1 + Output Terminal Connected * * * *




7
GPS Verification/ Adjustment Manual




Default GPS- GPS- GPS- GPS-
No Description
Settings 4303 4251 3303 2303
CH1 C.V./ C.C. Indicator
10 Green : Constant Voltage (C.V.) * * * *
Red : Constant Current (C.C.)

11 CH3 - Output Terminal * * *
12 CH3 + Output Terminal * * *
13 CH3 Overload Indicator * * *
14 CH1/ CH3 Selector CH1 * *
15 CH3 Voltage Control Minimum * *
16 CH1 Voltage Control Minimum * * * *
CH1 CH1
17 CH1/ CH3 Voltage Meter * * Only Only

18 CH1 Current Control Minimum * * * *
CH1 CH1
19 CH1/ CH3 Current Meter * * Only Only

20 Mode Switch Independent
Independent * * * *
Series
22
Parallel
CH2 CH2
21 CH2/ CH4 Voltage Meter * * Only Only

23 CH2 Voltage Control Minimum * * * *
CH2 CH2
24 CH2/ CH4 Current Meter * * Only Only

25 CH2 Current Control Minimum * * * *
26 CH4 Voltage Control Minimum * *
27 CH2/ CH4 Selector CH2 * *
28 Output Switch OFF * * * *
29 Output Indicator * * * *
30 CH4 Overload Indicator * *




8
Performance Verification




Performance Verification

Overall Procedure
1. Prepare the Equipment according to the following table.
2. Set the front panel according to the Default Settings (page7).
3. Verify a specification item and record the result (page10 to 26).
The recording tables are at the end of this chapter (page28).
4. Repeat step 3 for all items.
5. In case of over- or under-specification, continue with the
relevant item in the Adjustment chapter (page31).


Verification Equipment
Recommended
Equipment Required Specification Used in
Model
AC & DC Voltage
Accuracy: < 0.1%
Digital GDM-8245
DC Current Range: 6A All items
Multimeter GDM-8246
DC Current Accuracy:
<0.1%
2nd Digital AC & DC Voltage GDM-8245
Ripple Current
Multimeter Accuracy: < 0.1% GDM-8246
DC Voltage Range: 60V
Load Regulation
DC Current Range: 6A Agilent
Electronic Load Ripple Voltage
CV, CC, CR Mode N3305A
Ripple Current
Short Mode
Capacity: 1k VA
AC Power Frequency: 50 60Hz APS-9102
Ripple Voltage
Supply Line Voltage: 10% Agilent 6813B
*230V: -6% ~ +10%
GPS
Voltage rating: > 60V
Multimeter All items ---
Current rating: > 6A
cable
GPS 2nd
Multimeter Voltage rating: > 30V Ripple Current ---
cable
GPS Load Regulation
Voltage rating: > 60V
Electronic Load Ripple Voltage ---
Current rating: > 6A
cable Ripple Current
For calculating the
Calculator All items ---
acceptance ranges


9
GPS Verification/ Adjustment Manual




Output Voltage Verification
Here we verify Minimum Output Voltage, Maximum Output Voltage, and
Voltage Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Verification steps

1. Set the front panel according to Default Settings, page7.
2. Connect the Multimeter to CH1 and turn ON the Output
Switch.
Minimum Output Voltage
3. (CH1, CH2 only) Turn up the Current Control to full.
4. (CH1, CH2 only) Make sure the indicator shows C.V. (green).
5. Record the Multimeter readout as Minimum Output Voltage.
Maximum Output Voltage
6. Turn up the Voltage Control to full.
7. (CH1, CH2 only) Make sure the indicator shows C.V. (green).
8. Record the Multimeter readout as Maximum Output Voltage.
Out ON Meter Accuracy
9. Record the GPS readout. Calculate the difference between the
previous Multimeter readout and record it as Out ON Meter
Accuracy.
Out OFF Meter Accuracy
10. Turn OFF the Output Switch.

10
Performance Verification


11. Record the GPS readout. Calculate the difference between the
previous GPS readout (Output ON) and record it as Out OFF
Meter Accuracy.
12. Switch the GPS connection to the next channel and turn ON
the Output Switch.
13. Repeat step 3 to 12 for CH2, CH3, and CH4.

Acceptance range: Output Voltage

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Min: < -30mV Min: < -30mV Min: < -30mV
CH1 Max: 30V +3% ~ Max: 25V +3% ~ Max: 30V +3% ~ +8% (30.9 ~
+8% (30.9 ~ 32.4) +8% (25.75 ~ 27) 32.4)
Min: < -30mV Min: < -30mV
CH2
Max: > CH1 +0.2V Max: > CH1 +0.2V
Min: 2.2V 8% Min: 3.0V 8%
Min: 5.0V 8%
(2.024 ~ 2.376) (2.76 ~ 3.24)
CH3 (4.6 ~ 5.4)
Max: 5.2V 8% Max: 6.0V 8%
Max: N/A
(4.784 ~ 5.616) (5.52 ~ 6.48)
Min: 8.0V 8% (7.36 ~ 8.64)
CH4
Max: 15.0V 8% (13.8 ~ 16.2)


Acceptance range: Voltage Meter Accuracy

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Out ON:
CH1 (0.5% rdg + Out ON:
2digits) (0.5% rdg +
Out ON: (0.5% rdg + 2digits) Out OFF: 2digits)
CH2 Out OFF: (0.5% rdg + 8digits) (0.5% rdg + Out OFF: N/A
8digits)
CH3 N/A
CH4


When out of range...

Refer to Output Voltage adjustment, page37.




11
GPS Verification/ Adjustment Manual




Tracking Series Voltage Verification
Here we verify Tracking Series Minimum Voltage, Tracking Error, and
Tracking Series Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Verification steps

1. Set the front panel according to Default Settings, page7.
2. Connect the Multimeter to CH1 and turn ON the Output
Switch.
Tracking Series Minimum Voltage
3. Turn up the Current Control to full and set the Tracking
Switch to Series .

4. Make sure the indicator shows C.V. (green) for both CH1 and
CH2.
5. Turn up the Voltage control to 1.0V and record the Multimeter
readout.
6. Switch the GPS connection to CH2, turn up the Current
Control to full, and record the Multimeter readout.
7. Calculate the difference between the CH1 readout and record
it as Tracking Series Minimum Voltage.
Tracking Error
8. Switch the GPS connection to CH1, turn up the Voltage
Control to full, and record the Multimeter readout.


12
Performance Verification


9. Make sure the indicator shows C.V. (green) for both CH1 and
CH2.
10. Switch the GPS connection to CH2, turn up the Voltage
Control to full, and record the Multimeter readout.
11. Calculate the difference between CH1 and record it as
Tracking Error.
Tracking Series Meter Accuracy
12. Switch the GPS connection to CH1 and record the GPS
readout. Turn OFF the Output Switch and record the GPS
readout.
13. Calculate the difference between Output ON and OFF GPS
readout and record it as CH1 Tracking Series Meter Accuracy.
14. Switch the GPS connection to CH2 and record the GPS
readout. Turn ON the Output Switch and record the GPS
readout.
15. Calculate the difference between Output ON and OFF GPS
readout and record it as CH2 Tracking Series Meter Accuracy.

Acceptance range

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Minimum Voltage: 10mV Minimum Voltage: 10mV
Error: 0.5% of CH1 + 10mV Error: 0.5% of CH1 + 10mV

CH1 Meter
Meter Accuracy: (0.5% rdg + Accuracy: N/A
8digits) (0.5% rdg +
CH2
8digits)


When out of range...

Refer to Tracking Series Voltage adjustment, page40.




13
GPS Verification/ Adjustment Manual




Output Current Verification
Here we verify Minimum Output Current, Maximum Output Current, and
Current Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Verification steps

1. Set the front panel according to Default Settings, page7.
2. Connect the Multimeter to CH1 and turn ON the Output
Switch.
Minimum Output Current
3. Turn up the Voltage Control to full.
4. (CH1, CH2 only) Make sure the indicator shows C.C. (red).
5. (CH1, CH2 only) Record the Multimeter readout as Minimum
Output Current.
Maximum Output Current
6. (CH1, CH2 only) Turn up the Current Control to full.
7. (CH1, CH2 only) Make sure the indicator shows C.C. (red).
8. (CH3, CH4 only) Make sure the Overload indicator turns on.
9. Record the Multimeter readout as Maximum Output Current.
Out ON Meter Accuracy
10. Record the GPS readout. Calculate the difference between the
previous Multimeter readout and record it as Out ON Meter
Accuracy.

14
Performance Verification


Out OFF Meter Accuracy
11. (CH1, CH2 only) Turn OFF the Output Switch.
12. (CH1, CH2 only) Record the GPS readout. Calculate the
difference between the previous GPS readout (Output ON)
and record it as Output OFF Meter Accuracy.
13. Switch the GPS connection to the next channel and turn ON
the Output Switch.
14. Repeat step 3 to 13 for CH2, CH3, and CH4.

Acceptance range: Output Current

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Min: < -30mA Min: < -30mA
Min: < -30mA
CH1 Max: 3A +2% ~ Max: 0.5A +2%~
Max: 3A +2% ~ +10% (3.06~3.3)
+10% (3.06~3.3) +10%(0.51~0.6)
Min: < -30mA Min: < -30mA
CH2
Max: CH1 < CH2 < CH1+150mA Max: CH1 < CH2 Min: N/A Min: N/A
Min: N/A
CH3 Max: 1.18A ~ Max: 3.38A ~
Max: 2.8A ~ 2.9A
1.20A 3.42A
Min: N/A
CH4
Max: 1.12A ~ 1.28A


Acceptance range: Current Meter Accuracy

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Out ON:
CH1 (0.5% rdg + Out ON:
Out ON: (0.5% rdg + 2digits) 2digits) (0.5% rdg +
Out OFF: (0.5% rdg + 8digits) Out OFF: 2digits)
CH2 (0.5% rdg +
8digits)
CH3 N/A
N/A
CH4


When out of range...

Refer to Output Current adjustment, page42.

Refer to Overload Indicator adjustment, page46.




15
GPS Verification/ Adjustment Manual




Tracking Parallel Current Verification
Here we verify Tracking Parallel Maximum Current and Tracking Parallel
Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Verification steps

1. Set the front panel according to Default Settings, page7.
2. Connect the Multimeter to CH1 and turn ON the Output
Switch.
Tracking Parallel Maximum Current
3. Turn up CH2 Voltage Control, CH2 Current Control, and CH1
Voltage Control to full.
4. Turn up CH1 Current Control to 3.000A by watching the
Multimeter.
5. Set the Tracking Switch to Parallel .

6. Record the Multimeter readout as Tracking Parallel Maximum
Current.
Tracking Parallel Meter Accuracy
7. Record the GPS readout.
8. Turn OFF the Output Switch.
9. Record the GPS readout. Calculate the difference between the
previous GPS readout (Output ON) and record it as Tracking
Parallel Meter Accuracy.


16
Performance Verification


Acceptance range: Output Current

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Max: 6.000A Max: 6.000A


Acceptance range: Meter Accuracy

GPS-4303 GPS-4251 GPS-3303 GPS-2303

(0.5% rdg +
(0.5% rdg + 8digits) N/A
8digits)


When out of range...

Refer to Tracking Parallel Current adjustment, page44.




17
GPS Verification/ Adjustment Manual




Current Load Regulation Verification
Here we verify Current Load Regulation for Independent and Tracking
Parallel mode.


Connection

Connect the Digital Multimeter in series with the Electronic Load
and GPS.

Digital Multimeter
GPS Series


V

A


Electronic Load
- 4+ - 2+ - 1+ - 3+




-+



Electronic Load settings

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
30V, 3A 25V, 0.5A 30V, 3A
CH2
Tracking Parallel Tracking Parllel
Tracking Parallel 30V, 6A
30V, 6A 25V, 1A




18
Performance Verification



Verification steps

1. Set the front panel according to Default Settings, page7 and
turn OFF the Electronic Load output.
2. Connect the Multimeter and Electronic Load to CH1 and turn
ON the Output Switch.
3. Turn ON the Electronic Load output. Set the output value
according to the table on the previous page.
4. Turn up the Voltage Control and Current Control to full.
5. (Tracking Parallel only) Set the Tracking Switch to
Parallel .

6. Record the Multimeter readout.
7. Short the Electronic Load output.
8. Record the Multimeter readout.
9. Calculate the difference between normal and shorted Load
Multimeter readout and record as Current Load Regulation.
10. Set the Electronic Load output to normal (No short).
11. Switch the GPS connection to the next channel and turn ON
the Output Switch.
12. Repeat step 3 to 11 for CH2 and Tracking Parallel (Connect to
CH1).

Acceptance range

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1 0.2% +3mA 0.2% +3mA 0.2% +3mA
CH2 ( 9mA) ( 4mA) ( 9mA)

Tracking Parallel Tracking Parallel Tracking Parallel
0.2% +5mA 0.2% +5mA 0.2% +5mA
( 17mA) ( 7mA) ( 17mA)




19
GPS Verification/ Adjustment Manual




Ripple Current Verification
Here we verify Ripple Current for Independent mode.


Connection

Connect the first Digital Multimeter in series with the Electronic
Load and GPS. Connect the second Digital Multimeter in parallel to
GPS.

Digital Multimeter
GPS Series


V

A


Electronic Load
- 4+ - 2+ - 1+ - 3+




Digital Multimeter
- +
V

A




Electronic Load settings

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
30V, 3A 25V, 0.5A 30V, 3A
CH2




20
Performance Verification



Verification steps

1. Set the front panel according to Default Settings, page7 and
turn OFF the Electronic Load output.
2. Connect the Multimeter and Electronic Load to CH1 and turn
ON the Output Switch.
3. Turn ON the Electronic Load output. Set the output value
according to the table on the previous page
4. Change the Electronic Load to CR mode.
5. Decrease the Electronic Load value until the C.C. indicator
turns on.
6. Record the first Multimeter readout (DC Current).
7. Record the second Multimeter readout (DC Voltage).
8. Calculate Load Resistance R = (DC Voltage)/ (DC Current).
9. Switch the second Multimeter range to AC mV. Record the
Multimeter readout.
10. Calculate the Ripple Current I = (AC mV)/ (Load Resistance
R).
11. Switch the GPS connection to CH2 and turn ON the Output
Switch.
12. Repeat step 3 to 11 for CH2.

Acceptance range

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
3mA rms 3mA rms
CH2




21
GPS Verification/ Adjustment Manual




Voltage Load Regulation Verification
Here we verify Voltage Load Regulation for Independent and Tracking
Parallel mode.


Connection
Digital Multimeter

GPS Series
V

A




Electronic Load
- 4+ - 2+ - 1+ - 3+




-+



Electronic Load settings

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
30V, 3A 25V, 0.5A 30V, 3A
CH2
CH3 5.2V, 1A 6V, 2.5A 5V, 3A
CH4 15V, 1A
Tracking Parallel Tracking Parllel
Tracking Parallel 30V, 6A
30V, 6A 25V, 1A




22
Performance Verification



Verification steps

1. Set the front panel according to Default Settings, page7 and
turn OFF the Electronic Load output.
2. Connect the Multimeter and Electronic Load to CH1 and turn
ON the Output Switch.
3. Turn ON the Electronic Load output. Set the output value
according to the table on the previous page.
4. Turn up the Voltage Control and Current Control to full.
5. (Tracking Parallel only) Set the Tracking Switch to Parallel
.

6. Record the Multimeter readout.
7. Turn OFF the Electronic Load output.
8. Record the Multimeter readout.
9. Calculate the difference between Load ON and OFF
Multimeter readout and record as Voltage Load Regulation.
10. Switch the GPS connection to the next channel and turn ON
the Output Switch.
11. Repeat step 3 to 10 for CH2, CH3, CH4, and Tracking Parallel
(Connect to CH1).

Acceptance range: Load Regulation

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1 0.01% +3mV 0.01% +3mV 0.01% +3mV
CH2 ( 6mV) ( 5.5mV) ( 6mV)

CH3 15mV 15mV
CH4 10mV
Tracking Parallel Tracking Parallel Tracking Parallel
0.01% +3mV 0.01% +3mV 0.01% +3mV
( 6mV) ( 5.5mV) ( 6mV)




23
GPS Verification/ Adjustment Manual




Tracking Series Load Regulation/ Ripple Verification
Here we verify Voltage Load Regulation and Ripple Voltage for Tracking
Series mode.


Connection

Connect the positive side to CH1 + and the negative side to CH2 -.

Digital Multimeter
AC Power Supply

V

A




Electronic Load GPS Series




-+
- 4+ - 2+ - 1+ - 3+




Electronic Load settings

GPS-4303 GPS-4251 GPS-3303 GPS-2303

60V, 3A 50V, 0.5A 60V, 3A




24
Performance Verification



Verification steps

1. Set the front panel according to Default Settings, page7 and
turn OFF the Electronic Load output.
2. Connect the Multimeter and Electronic Load as shown in the
previous page and turn ON the Output Switch.
3. Turn up CH1 Voltage Control and Current Control to full.
4. Turn up CH2 Voltage Control and Current Control to full.
5. Set the Tracking Switch to Series .

Tracking Series Voltage Load Regulation
6. Record the Multimeter readout.
7. Turn ON the Electronic Load output. Set the output value
according to the table on the previous page.
8. Record the Multimeter readout.
9. Calculate the difference between Load ON and OFF
Multimeter readout and record as Tracking Series Load
Regulation.
Tracking Series Ripple Voltage
10. Check the AC Selector on the rear panel for Power Supply
Voltage Rating. Set AC Power to Rating value -10%, 50Hz.
(for 230V, -6%, 50Hz).
11. Record the Multimeter readout (AC Voltage) as Ripple Voltage.
12. Repeat step 11 for AC Power -10%, 60Hz (for 230V, -6%,
50Hz) / +10%, 50Hz/ +10%, 60Hz.
13. Pick up the largest value of the four as Tracking Series Ripple
Voltage.

Acceptance range

GPS-4303 GPS-4251 GPS-3303 GPS-2303

Tracking Series Tracking Series
Load Regulation Load Regulation
Tracking Series Load Regulation
0.01% +3mV 0.01% +3mV
0.01% +3mV ( 9mV)
( 9mV) ( 8mV)
Tracking Series Ripple Voltage
Tracking Series Tracking Series
2mVrms
Ripple Voltage Ripple Voltage
2mVrms 2mVrms




25
GPS Verification/ Adjustment Manual




Ripple Voltage Verification
Here we verify Ripple Voltage for Independent and Tracking Parallel mode.


Connection

Digital Multimeter
AC Power Supply

V

A




Electronic Load GPS Series




-+
- 4+ - 2+ - 1+ - 3+




Electronic Load settings

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
30V, 3A 25V, 0.5A 30V, 3A
CH2
CH3 5.2V, 1A 6V, 2.5A 5V, 3A
CH4 15V, 1A
Tracking Parallel Tracking Parallel
Tracking Parallel 30V, 6A
30V, 6A 25V, 1A




26
Performance Verification



Verification steps

1. Set the front panel according to Default Settings, page7 and
turn OFF the Electronic Load output.
2. Connect the Multimeter and Electronic Load to CH1 and turn
ON the Output Switch.
3. Turn up Voltage Control and Current Control to full.
4. (Tracking Parallel only) Set the Tracking Switch to
Parallel .

5. Turn ON the Electronic Load output. Set the output value
according to the table on the previous page.
6. Check the AC Selector on the rear panel for Power Supply
Voltage Rating. Set AC Power to Rating value -10%, 50Hz.
(for 230V, -6%, 50Hz).
7. Record the Multimeter readout (AC Voltage) as Ripple Voltage.
8. Repeat step 7 for AC Power -10%, 60Hz (for 230V, -6%, 50Hz)
/ +10%, 50Hz/ +10%, 60Hz.
9. Pick up the largest value of the four as Ripple Voltage.
10. Switch the GPS connection to the next channel and turn ON
the Output Switch.
11. Repeat step 3 to 10 for CH2, CH3, CH4, and Tracking Parallel
(Connect to CH1).

Acceptance range

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1
1mVrms 1mVrms
CH2
CH3 2mVrms
2mVrms
CH4
Tracking Parallel Tracking Parallel
2mVrms 2mVrms




27
GPS Verification/ Adjustment Manual




Recording Tables

GPS-4303 GPS-4251 GPS-3303 GPS-2303
CH C.V. Multimeter Pass/ Fail Note
Minimum 1 ON OFF mV P F
Output 2 ON OFF mV P F
Voltage 3 V P F
4 V P F
CH C.V. Multimeter Pass/ Fail Note
1 ON OFF V P F
Maximum
V
Output 2 ON OFF P F
( CH1 + 0.2V = V)
Voltage
3 V P F
4 V P F
Multimeter GPS Out Multimeter 0.5% rdg +
CH Pass/ Fail
Out ON ON GPS 2 digits
Out ON
Voltage 1 V V mV mV P F
Meter 2 V V mV mV P F
Accuracy 3 V V mV mV P F
4 V V mV mV P F
GPS Out GPS Out GPS Out 0.5% rdg +
CH Pass/ Fail
ON OFF ON OFF 8 digits
Out OFF
Voltage 1 V V mV mV P F
Meter 2 V V mV mV P F
Accuracy 3 V V mV mV P F
4 V V mV mV P F
Tracking CH C.V. Multimeter CH2 CH1 Pass/ Fail Note
Series 1 ON OFF V
Minimum mV P F
Voltage 2 ON OFF V

10mV +
Tracking CH C.V. Multimeter CH2 CH1 Pass/ Fail
0.5%(CH1)
Series
1 ON OFF V
Error mV mV P F
2 ON OFF V
Tracking GPS Out GPS Out GPS Out 0.5% rdg +
CH Pass/ Fail
Series OFF ON ON OFF 8 digits
Meter 1 V V mV mV P F
Accuracy 2 V V mV mV P F




28
Performance Verification



Recording Tables cont.

Minimum CH C.C. Multimeter Pass/ Fail Note
Output 1 ON OFF mA P F
Current 2 ON OFF mA P F
CH C.C. Overload Multimeter Pass/ Fail Note
Maximum 1 ON OFF A P F
Output 2 ON OFF A P F
Current 3 ON OFF A P F
4 ON OFF A P F
Multimeter 0.5% rdg +
CH Multimeter GPS Pass/ Fail
- GPS 2 digits
Out ON
Current 1 A A mA mV P F
Meter 2 A A mA mV P F
Accuracy 3 A A mA mV P F
4 A A mA mV P F
Out OFF GPS Out GPS Out 0.5% rdg +
CH GPS Out ON Pass/ Fail
Current OFF ON - OFF 8 digits
Meter 1 A A mA mV P F
Accuracy 2 A A mA mV P F
Tracking Multimeter
CH Multimeter Parallel Pass/ Fail Note
Parallel Independent
Maximum
Current 1 A A P F
Tracking GPS Out GPS Out 0.5% rdg +
CH GPS Out ON Pass/ Fail
Parallel OFF ON - OFF 8 digits
Meter
Accuracy 1 A A mA mV P F
Load
Current CH Load ON Load short Pass/ Fail Note
ON - short
Load
1 A A mA P F
Regulation
2 A A mA P F
Tracking Load
CH Load ON Load short Pass/ Fail Note
Parallel ON - short
Current
Load 1 A A mA P F
Regulation
Ripple Load Ripple
CH DC Current DC Voltage AC Voltage
Current Resistance Current
Regulation 1 A V mV mA
CH1 P F
CH2 P F 2 A V mV mA
Load
CH Load ON Load OFF Pass/ Fail Note
ON - OFF
Voltage 1 V V mV P F
Load
2 V V mV P F
Regulation
3 V V mV P F
4 V V mV P F


29
GPS Verification/ Adjustment Manual



Recording Tables cont.

Tracking Load
CH Load ON Load OFF Pass/Fail Note
Parallel ON - OFF
Voltage
Load 1 V V mV P F
Regulation
Tracking Load
CH Load OFF Load ON Pass/Fail Note
Series ON - OFF
Voltage
Load 1
V V mV P F
Regulation 2
CH AC Power Multimeter Largest Pass/ Fail Note
Tracking -10/6%,50Hz mV
Series
Ripple 1 +10%, 50Hz mV
P F
Voltage 2 -10/6%,60Hz mV
+10%, 60Hz mV
CH AC Power Multimeter Largest Pass/ Fail Note
-10/6%,50Hz mV
Ripple
Voltage +10%, 50Hz mV
1 P F
-10/6%,60Hz mV
+10%, 60Hz mV
CH AC Power Multimeter Largest Pass/ Fail Note
-10/6%,50Hz mV
Ripple
Voltage +10%, 50Hz mV
2 P F
-10/6%,60Hz mV
+10%, 60Hz mV
CH AC Power Multimeter Largest Pass/ Fail Note
-10/6%,50Hz mV
Ripple
Voltage +10%, 50Hz mV
3 P F
-10/6%,60Hz mV
+10%, 60Hz mV
CH AC Power Multimeter Largest Pass/ Fail Note
-10/6%,50Hz mV
Ripple
Voltage +10%, 50Hz mV
4 P F
-10/6%,60Hz mV
+10%, 60Hz mV
CH AC Power Multimeter Largest Pass/ Fail Note
Tracking -10/6%,50Hz mV
Parallel
Ripple +10%, 50Hz mV
1 P F
Voltage -10/6%,60Hz mV
+10%, 60Hz mV




30
Adjustment




Adjustment

Overall Procedure
1. Prepare the Equipment according to the following table.
2. Open the Case according to the diagram on page32.
3. Set the front panel according to Default Settings, page7.
4. Connect the Multimeter to GPS CH1 and turn ON the Output
Switch.
5. Adjust the specifications according to your needs (page34 to
46). The adjustment points are shown in the diagram: page33
(GPS-4303), page34 (GPS-4251), page35 (GPS-3303), page36
(GPS-2303).
6. When the adjustment is completed, run the Performance
Verification again to verify the result (page9).


Adjustment Equipment
Recommended
Equipment Required Specification Used in
Model
AC & DC Voltage
Accuracy: < 0.1%
Digital GDM-8245
DC Current Range: 6A All items
Multimeter GDM-8246
DC Current Accuracy:
<0.1%
DC Voltage Range: 60V Agilent
Electronic Load Overload Indicator
Current Range: 6A N3305A
GPS
Voltage rating: > 60V
Multimeter All items ---
Current rating: > 6A
cable
GPS
Voltage rating: > 60V
Electronic Load Overload Indicator ---
Current rating: > 6A
cable
Flathead Screw 1.5mm
All items ---
Driver Small For adjustment
Phillips Screw 2mm
All items ---
Driver Small For adjustment
Phillips Screw 3mm/ 4mm
All items ---
Driver Large For opening the case




31
GPS Verification/ Adjustment Manual




Opening the Case
1. Take off six screws, 3x6mm, on the side panels.
2. Take off two screws, 4x12mm, holding the belt on the top
panel.




3. Hold the case, slide it behind, and pull it off upward.




32
Adjustment




Adjustment Point

GPS-4303


Left View Right View

VR201
VR801
VR701
VR901
VR101
VR803
VR103
VR303
VR203
VR301
VR702
VR902
VR601 VR401
VR602 VR402




Top View
VR501
VR306 VR804
VR802 VR202
VR502 VR904
VR903 VR703




33
GPS Verification/ Adjustment Manual



GPS-4251


Left View Right View


VR901 VR701
VR902 VR702
VR803 VR203
VR303 VR101
VR301


VR401
VR602
VR601 VR402




Top View
VR306 VR804
VR802 VR501
VR302 VR703
VR502 VR904
VR903 VR102




Main PCB - Rear View

VR201 Daughter VR801
VR202 Board



VR103



34
Adjustment



GPS-3303


Left View Right View

VR201
VR701
VR801
VR101
VR901 VR103
VR203
VR303
VR702
VR301 VR403
VR401
VR402




Top View
VR501
VR306 VR804
VR802 VR202
VR502 VR904
VR903 VR703




35
GPS Verification/ Adjustment Manual



GPS-2303


Left View Right View




VR201
VR801
VR103
VR101




Top View

VR802
VR303
VR202
VR502
VR306 VR501

VR301




36
Adjustment




Output Voltage Adjustment
Here we adjust Minimum Output Voltage, Maximum Output Voltage, Out
ON Voltage Meter Accuracy, and Out OFF Voltage Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Minimum Output Voltage Adjustment (GPS-4251 only)

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up the Current Control to full.
3. Adjust the Multimeter readout. The following table shows the
adjustment point and range.
4. Switch the connection to CH2 and repeat step 2 and 3.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR102
CH1 N/A
< -30mV
N/A
VR302
CH2 N/A
< -30mV
CH3 N/A
N/A
CH4




37
GPS Verification/ Adjustment Manual



Maximum Output Voltage Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up the Current Control and Voltage Control to full.
3. Adjust the Multimeter readout. The following table shows the
adjustment point and range.
4. Switch the connection to CH2. Repeat step 2 and 3 for CH2
and CH3 (GPS-3303 only).
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR101 VR101
VR101
CH1 30V +3% ~ +8% 25V +3% ~ +8%
30V +3% ~ +8% (30.9 ~ 32.4)
(30.9 ~ 32.4) (25.75 ~ 27)
VR301 VR301
CH2
> CH1 +0.2V > CH1 +0.2V
VR403
CH3 5V 8%
N/A (4.6 ~ 5.4)
CH4


Out ON Voltage Meter Accuracy Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up the Current Control and Voltage Control to full.
3. Adjust the difference between Multimeter and GPS readout.
The following table shows the adjustment point and range.
4. Switch the connection to CH2 and repeat step 2 and 3.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR201 VR201
CH1
(0.5% rdg + 2digits) (0.5% rdg + 2digits)
VR801 VR801
CH2
(0.5% rdg + 2digits) (0.5% rdg + 2digits)
CH3 N/A
N/A
CH4




38
Adjustment



Out OFF Voltage Meter Accuracy Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn ON the Output.
2. Turn up the Current Control and Voltage Control to full.
3. Check the GPS readout. Turn OFF the Output and adjust the
difference between Out ON and OFF GPS readout. The
following table shows the adjustment point and range.
4. Switch the connection to CH2. Repeat step 2 and 3 for CH2,
CH3, and CH4.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1 VR202 VR202
(0.5% rdg + N/A
CH2 (0.5% rdg + 8digits)
8digits)
VR203
CH3 N/A
(0.5% rdg + 8digits)
VR803
CH4
(0.5% rdg + 8digits)




39
GPS Verification/ Adjustment Manual




Tracking Series Voltage Adjustment
Here we adjust Tracking Series Minimum Voltage, Tracking Series Error,
and Tracking Series Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Tracking Series Minimum Voltage Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up the Current Control to full and set the Tracking
Switch to Series . Turn up the Voltage Control to 1.0V.
3. Check the Multimeter readout. Switch the connection to CH2
and adjust the difference between CH1 and CH2 Multimeter
readout. The following table shows the adjustment point and
range.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR306 VR306
10mV 10mV




40
Adjustment



Tracking Series Error Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up CH1 Current Control and Voltage Control to full.
Turn up CH2 Current Control and Voltage Control to full.
3. Set the Tracking Switch to Series and check the
Multimeter readout.
4. Switch the connection to CH2 and adjust the difference
between CH1 and CH2 Multimeter readout. The following
table shows the adjustment point and range.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR501 VR501
0.5% of CH1 + 10mV 0.5% of CH1 + 10mV


Tracking Series Meter Accuracy Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up CH1 Current Control and Voltage Control to full.
Turn up CH2 Current Control and Voltage Control to full.
3. Set the Tracking Switch to Series .
4. Check the GPS readout and turn OFF the Output.
5. Adjust the difference between Out ON and OFF GPS readout.
The following table shows the adjustment point and range.
6. Switch the connection to CH2 and repeat step 2, 3, and 4.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1 VR804 VR804
(0.5% rdg + N/A
CH2 (0.5% rdg + 8digits)
8digits)




41
GPS Verification/ Adjustment Manual




Output Current Adjustment
Here we adjust Maximum Output Current, Out ON Current Meter Accuracy,
and Out OFF Current Meter Accuracy.


Connection

GPS Series
Digital Multimeter


V

A

- 4+ - 2+ - 1+ - 3+




Maximum Output Current Adjustment

1. Set the front panel according to Default Settings, page7, and
connect the Multimeter to CH1. Turn on the Output.
2. Turn up the Current Control and Voltage Control to full.
3. Adjust the Multimeter readout. The following table shows the
adjustment point and range.
4. Switch the connection to CH2 and repeat step 2 and 3.
GPS-4303 GPS-4251 GPS-3303 GPS-2303

VR103 VR103
VR103
CH1 3A +2% ~ +10% 0.5A +2%~+10%
3A +2% ~ +10% (3.06 ~ 3.3)
(3.06 ~ 3.3) (0.51 ~ 0.6)
VR303 VR303
CH2
CH1 < CH2 < CH1+150mA CH1 < CH2 < CH1+150mA
CH3 N/A
N/A
CH4




42
Adjustment



Out ON Current Meter Accuracy Adjustment

1.