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Adjustment and Test procedure Manual for digital multimeter Model: DM-332
LG Precision Co., Ltd.
1999/09/22
P/N:
Adjustment and test procedure Manual
DM-332
Revision History NO 1 Modification Test current error Correction(page 7 of 13) in DC Current Measurement ECN NO Date 1999/10/5 Name Yu Jong-Wook
Created : 1999/09/20 Last Modified : 1999/10/5
Page 2 of 13
LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
General Specifications of DM-332
Display: 3 3/4 Digit Multimeter Battery Life: Typical 200 hours Operating Temperature: 0ºC ~ 40ºC ( 80% RH) Storage temperature: -10ºC ~ 60ºC ( 70% RH) Accuracy guaranteed temperature: 23ºC ± 5ºC ( 80% RH) Maximum Reading Rate: 2 readings / second
Explanation of each part of DM-332
¨ç ¨è ¨é ¨ê LCD Display Power S/W Rotary S/W Used for selecting mode and range. Transistor Socket Used for inserting transistor to measure ¨í ¨ì ¨ë Terminal -V-mA-Hz Used for AC/DC voltage, Resistance, frequency and current measure terminal Terminal COM Used for common terminal Terminal 10A Used for measuring DC/AC current below 10A
LCD Display Power S/W
Rotary S/W
Transistor Socket Terminal -V-mA-Hz Terminal COM
Terminal 10A
Fig 1 - Front View of DM-332
Note Adjustment and Test of DM-332 should be conducted under proper test environment. Check operating temperature and relative humidity before adjustment and test. Accuracy guaranteed temperature: 23ºC ± 5ºC (Below 80% RH)
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual l
DM-332
Test Equipment List
DMM Calibrator: 1set. Decade Capacitor: 1set. DC Power Supply (0 ~ 12V) or 9V Battery. Decade Resistor, Decad Capacitor : Each 1 set Signal Generator: 1set DMM (3 3/4 Digit) : 1set
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual l
DM-332
Calibration Procedure 1. Power On Test
Turn DM-332 on by using power S/W. and check LCD display is turned on.
2. Function Check 2-1. LCD Display Test
Check LCD Display to each range by selecting range with Rotary S/W. Below chart shows correct display
Function
DC VOLTAGE AC VOLTAGE DC CURRENT AC CURRENT BAT HFE Capacitor Hz Diode Continuity Resistor
LCD Display to each range
000.0mV 0.000V 00.00V 000.0V 0000V 000.0mV 0.000V 00.00V 000.0V 0000V 0.000mA 00.00mA 000.0mA 00.00A 0.000mA 00.00mA 000.0mA 00.00A 0.000V 00.00V 0000 00.00nF 000.0nF 0.000uF 00.00uF 00.00Hz More than 2.400V 400.0 400.0 4.000k 40.00k 400.0k 4000k 40.00M
2-2. MIN/MAX Function Test
Check min/max display is set each time MIN/MAX button is pushed.
2-3. HOLD Function Test Check display is hold state when HOLD button is pushed. 2-4 Warning System Test Check Specification Buzzer Sound Insertion is not allowable Procedure Set other range with inserting a probe to 10A terminal on DC 10A range or AC 10A range. Insert a probe to 10A terminal on other range except DC 10A range or AC 10A range.
2-5 Auto Power Off Test DM-332 will be shut down after 30 minutes of no-operation. 2-6. Low Battery Warning Display Test
Check a message, "BATT" on LCD display when Power supply or Battery Voltage goes below 6.4V.
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
3. Adjustment of DC voltage, AC voltage DC current, Capacitance ,Frequency and Diode. Function
Reference Voltage
Adjustment Specification
0.999 ~ 1.000
Adjustment Procedure
1. Set Rotary S/W to DC Voltage 400mV range 2. Adjust VR2 to be 1.000V of TP1 voltage. 1. Set Rotary S/W to DC Voltage 400mV range 2. Apply DC 390mV to Terminal COM and Terminal V of DM-332 with a calibrator 3. Adjust VR3 to be displayed 390.00mV on LCD display 1. Set Rotary S/W to AC Voltage 4V range 2. Apply AC 3.9V/60Hz to Terminal COM and Terminal V with a calibrator 3. Adjust VR1 to be displayed 3.9V on LCD display 1. Set Rotary S/W to DC Current 10A Mode 2. Apply DC 10A current to Terminal COM and Terminal 10A with a calibrator 3. Adjust MN Wire(R39) to be displayed 10.00A on LCD display with a ripper
DC Voltage
389.98~390.02
AC Voltage
3.895~ 3.905
DC Current
9.95 ~ 10.05
4.Test 4-1 No Input on DC Voltage Mode
n n Specification : ±00.1mV Set Rotary S/W to DC Voltage 400mV range and check DM-332 to meet the above specification.
4-2 No Input on Capacitor Mode Range
40nF 400nF 4uF 40uF
Factory Specification
Less than 00.35 Less than 001.0 Less than 0.010 Less than 00.10
Test Procedure
Set Rotary S/W to CAP 40nF Range and check displayed value with test specification. Set Rotary S/W to CAP 400nF Range and check displayed value with test specification. Set Rotary S/W to CAP 4uF Range and check displayed value with test specification. Set Rotary S/W to CAP 40uF Range and check displayed value with test specification.
4-3 Short-circuit on DC Voltage Mode
n n n Specification : ±00.1 mV Set Rotary S/W to DC Voltage 400mV range and Short-circuit between terminal COM and terminal V Check DM-332 to meet the above specification.
4-4 Bar Graph Test
Check bar graph is proportional to measurement value and is displayed correctly.
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
4-5 DC Voltage Measurement Test
Set Rotary S/W to DC Voltage Mode and Apply below voltage to terminal COM and terminal V to each range with a calibrator
Range
DC 400mV DC 4V DC 40V DC 400V DC 1000V
Customer Specification
±(0.5% + 1dgt)
Factory Specification
±(0.4% + 1dgt)
Test DC Voltage
390mV 3.9V
±(0.5% + 3dgt) ±(0.7% + 2dgt)
±(0.4% + 3dgt) ±(0.6% + 2dgt)
39V 390V 1000V
4-6 AC Voltage Measurement Test
Set Rotary S/W to AC Voltage Mode and Apply below voltage to terminal COM and terminal V to each range with a calibrator. Check the measurement value to each frequency, 60Hz and 400Hz.
Range
AC 400mV AC 4V AC 40V AC 400V AC 750V
Customer Specification
Factory Specification
Test AC Voltage
390mV/60Hz 390mV/400Hz 3.9V/60Hz 3.9V/400Hz 39V/60Hz 39V/400Hz 390V/60Hz 390V/400Hz 750V/60Hz 750V/400Hz
±(1.0%+3dgt)
±(0.9%+3dgt)
4-7 DC Current Measurement Test
Set Rotary S/W to DC Current Mode and Apply below DC current to terminal COM and terminal mA to each range with a calibrator. Check the measurement value to each range
Range
DC 4m DC 40mA DC 400m
Customer Specification
±(1.5%+2dgt)
Factory Specification
±(1.4%+2dgt)
Test DC Current
3.9m 39mA 390m
Apply below DC current to terminal COM and terminal 10A with a calibrator.
Range
DC 10A
Customer Specification
±(2.0%+5dgt)
Factory Specification
±(1.9%+5dgt)
Test DC Current
9A
Created : 1999/09/20 Last Modified : 1999/10/5
Page 7 of 13
LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
4-8 AC Current Measurement Test
Set Rotary S/W to AC Current 20mA Mode and Apply below AC current to terminal COM and terminal mA to each range with a calibrator. Check the measurement value to each range
Range
AC 4mA AC 40m AC 400m
Customer Specification
Factory Specification
Test AC Current
3.9m/60Hz 3.9m/400Hz 39m/60Hz 39m/400Hz 390m/60Hz 390m/400Hz
±(1.5%+3dgt)
±(1.4%+3dgt)
Apply below AC current to terminal COM and terminal 10A with a calibrator.
Range
AC 10A
Customer Specification
±(2.0%+6dgt)
Factory Specification
±(1.9%+6dgt)
Test AC Current
9A/60Hz 9A/400Hz
4-9 Resistor Measurement Test
Set Rotary S/W to Resistance Measure Mode and Apply below resistance value to terminal COM and terminal V to each range with decade resistor. Check the measurement value to each range
Range
400 4k 40k 400k 4M 40M
Customer Specification
Factory Specification
Test Resistance value
390 3.9k 39k 390k
±(0.7%+2dgt)
±(0.6%+2dgt)
±(1.0%+2dgt) ±(2.5%+2dgt)
±(0.9%+2dgt) ±(2.4%+2dgt)
3.9M 10M
4-10 Capacitor Measurement Test
Apply below capacitance value between CAP jack with a decade capacitor. In this mode, bar graph is not shown on LCD display.
Range
40nF 400nF
Customer Specification
Factory Specification
Test Capacitance Value
39nF 390nF
±(5.0%+4dgt) 4µF 40µF
±(4.9%+4dgt) 3.9µF 39µF
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
4-11 Frequency Measurement Test
Set Rotary S/W to "HZ" mode and apply below frequency value to terminal COM and terminal V with a signal generator
Range
Customer Specification
Factory Specification
Test Frequency Value
100Hz/RMS Sine Wave100mV 1KHz/RMS Sine Wave 100mV
Frequency
±(0.3%+3dgt)
±(0.3%+3dgt)
10KHz / RMS Sine Wave 100mV 100KHz / RMS Sine Wave 2V 900KHz / RMS Sine Wave 4V
4- 12Diode & Continuity Test
Set Rotary S/W to diode test mode and apply a diode to terminal COM and terminal V with forward direction.
Range
Diode
Customer Specification
Factory Specification
Forward Direction : 0.500 Reverse Direction : 2.800
Set Rotary S/W to continuity test mode and Short-circuit between terminal COM and terminal V.
Buzzer will sound when measurement value is lower than 40.
Range
Continuity
Customer Specification
Factory Specification
Short Circuit : less than 000.3
4- 13 Battery Test
Set Rotary S/W to "BAT" test mode and apply below current to terminal COM and terminal V.
Range
1.5V 9V
Factory Specification
1.42V ~ 1.58V 8.5V ~ 9.5V
Test Procedure
Apply DC 110mA on 1.5V range Apply DC 9mA on 9V range
4-14 Transistor hFE Measurement Test
Set Rotary S/W to "hFE" mode and insert transistor below to transistor socket
Range
NPN
Customer Specification
Factory Specification
120 ~ 240
Test Transistor
3198Y 1266Y
PNP
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
4-15 Short-circuit ohm Test
Set Rotary S/W to Resistance 400 range and short-circuit to terminal COM and terminal V
Range
400
Customer Specification
Factory Specification
Less than 0.4
Created : 1999/09/20 Last Modified : 1999/10/5
Page 10 of 13
LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
Appendix A) Bill of material
LGP P/N 334-013-1 334-013-2 362-035 384-016-1 418-100 513-549R5 521-131 531-400 563-064-2 563-066 563-068 564-015 564-019 571-315 571-316 573-119 573-121 573-137 573-138 573-139 573-140 573-141 573-142 574-052-2 574-052-2 574-055 581-176 581-195 581-204 581-220 581-221 581-222 585-154-1 585-248 585-262 591-645 611-664 611-665 637-013 648-074 873-028R 873-027 884-028 Category BUSHING BUSHING SPRING HOLDER FILM VINYL PCB BARE B/D SWITCH CONNECTOR FUSE FUSE FUSE FUSE HOLDER FUSE HOLDER VARIABLE RESISTOR VARIABLE RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR PTC PTC SPARK GAP CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR DIODE DIODE DIODE IC TRANSISTOR TRANSISTOR BUZZER CRYSTAL Specification INPUT CORE BLACK DMM INPUT CORE RED DMM SHIELD SPRING DMM BAT HOLDER AA(UM-3)X2 UL PPI255 W=65.0 DMM M DM-332 PCB REV 5 PUSH S.W PS-2216A-L NS HFE SOCKET ESQ-104-23-G-S 250V 0.5A 50F UL&EU 250V 10A H314010 ULE14080 125V 1A 22NM MICRO 101L FUSE HOLDER FC51A(DMM) FUSE HOLDER FC61B 10A VR TMC3K B10K (SMD) VR TMC3K B20K (SMD) M.G 5 MOHM 1/2W 0.25% VR1 VR2,VR3 R40 R21 R9 R16 R15 R14 R13 R12 R8 R8A SG1 C7 C12,C13,C15,C17 C14 C10,C11 C4,C5 C8,C9 D2,D3,D4,D5 D1 D6,D7,D8,D9,D10 U1 Q2,Q3,Q4 Q1 B1 Y1 R39 F1 F2 F3 SP1 PCB Find No Quantity 1 2 1 1 1 1 2 1 1 1 1 2 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 4 1 2 2 2 4 1 5 1 3 1 1 1 1 1 1
W.W 0.99 OHM 1W 0.25% M.G 10 MOHM 1/2W -0.2/0.05% M.G 1.11MOHM 1/2W -0.2/0.05% M.F 101 KOHM 1/4W -0.2/0.05% M.F 10 KOHM 1/4W -0.2/0.05% M.F 1 KOHM 1/4W -0.2/0.05% M.F 100 -OHM 1/4W -0.2/0.05% PT05MP-L1K6001 PT05MP-L1K6001 AG15PC 152FS-K2M DAIYOYDEN ELEC 10UF 16V SRE-TYPE MP 0.1UF 63V J MMY168 MP 0.01UF 63V J MMY168 MP 0.033UF 63V K MMY168 ELEC 0.47UF 50V SRE-TYPE ELEC 2.2UF 35V SRE-TYPE RL105 KDS226 (SMD) KEC KDS184 (SMD) NJU9210FD A-D CON NJRC KSC2328A KRC110S (SMD) BUZZ SBT-11P X-TAL 4MHZ HC-49/U TYPE
MN WIRE MN WIRE CM2 10MOHM Mn WIRE CM2 DIA Mn WIRE CM2 DIA1.6MM 1.6MM PVC TUBE PVC TUBE VIT-300 27MM ULE843
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
LGP P/N CK1HI100D CK1HI104M CK1HI150J CK1HI220J RD0BP2R2J RD0CP102J RD0CP200J RD0CP220J RG0CP107J RMAH1000J RMAH1001F RMAH1003F RMAH1003J RMAH1004F RMAH1004F RMAH1502J RMAH2202J RMAH3303J RMAH3303J RMAH3602J RMAH43R0F RMAH5100F RMAH6802J RMAH6803J RMBP1000F RMBP6803C RMBP90R0C RMBP9R00C RMCP1004F
Category CAPACITOR CAPACITOR CAPACITOR CAPACITOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR
Specification CER 10PF 50V D (2012) CER 0.1UF 50V M (2012) CER 15PF 50V J (2012) CER 22PF 50V J (2012) C.F 2.2 -OHM 1/4W 5% C.F 1 KOHM 1/2W 5% C1
PCB Find No
Quantity 1 3 1 1 1 1 1 1 2 2 1 2 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1
C3,C6,C18 c19 C2 R38 R43 R36 R37 R22,R41 R5,R42 R28 R17,R18 R4 R1 R29 R26 R24,R25 R23 R27 R30 R3 R35 R31 R32 R11 R33,R34 R19 R20 R10
C.F 20 -OHM 1/2W 5% C.F 22 -OHM 1/2W 5% M.G 100 MOHM 1/2W 5% M.F 100 -OHM 1/8W 5% (3216) M.F 1 KOHM 1/8W 1% (3216)
M.F 100 KOHM 1/8W 1% (3216) M.F 100 KOHM 1/8W 5% (3216) M.F 1 MOHM 1/8W 1% (3216) M.F 1 MOHM 1/8W 1% (3216) M.F 15 KOHM 1/8W 5% (3216) M.F 22 KOHM 1/8W 5% (3216) M.F 330 KOHM 1/8W 5% (3216) M.F 330 KOHM 1/8W 5% (3216) M.F 36 KOHM 1/8W 5% (3216) M.F 43 -OHM 1/8W 1% (3216) M.F 510 -OHM 1/8W 1% (3216) M.F 68 KOHM 1/8W 5% (3216) M.F 680 KOHM 1/8W 5% (3216) M.F 100 -OHM 1/4W 1% M.F 680 KOHM 1/4W .25% M.F 90 -OHM 1/4W .25% M.F M.F 9 -OHM 1/4W .25% 1 MOHM 1/2W 1%
Created : 1999/09/20 Last Modified : 1999/10/5
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LG Precision Co., Ltd.
Adjustment and Test procedure Manual
DM-332
Appendix B) Schematic Diagram of DM-332
Created : 1999/09/20 Last Modified : 1999/10/5
Page 13 of 13
LG Precision Co., Ltd.