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INSTRUCTION MANUAL
DIGITAL FUNCTION GENERATOR
MODEL: 8112
if. To pward
TABLE of CONTENTS
8112
Picture of Model .....................................
U'TJ-`bJN`
Introduction..................................................
Before we Begin..........Q....................................
Front Panel of the Model 8112 .......................w.....
Front Panel Description.......................................
Operating Instructions........................................ 8
Operating Cautions............................................1D
Theory of Operation...........................................11
Calibration...................................................1a
Troubleshooting...............................................16
Adjustfient Location...........................................20
Block Diagram.................................................21
Circuit Diagram...............................................22
Component Layout..............................................26
Specifications................................................2?
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PICTURE of MODEL 8112
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INTRODUCTION
The Topward 8112 is a portable, bench type multi-purpose digital
function generator/counter capable of producing 5 different waveforms. These
are Sine, Square, Triangle, Pulse and Ramp.
The model 8112 features: Adjustable frequency range from 0.1 Hz to 2
MHz in 7 ranges, variable output amplitude from 5 mV to 20 Vp-p, variable
symmetry/duty cycle from 5% to 95% in the Ramp/Pulse mode, continuous or
externally controlled outputs, DC offset between --10 V to +10 U can be added
to all output waveforms, inverted and attenuated output, built-in 100 MHz
frequency counter with 25 mV input sensitivity.
- 2 _
FRONT PANEL of the MODEL 8112
Figure -- 1
12 11 T 9
FREQUENCY RANGE Hz/GATE THME ATT
1M TOOK 10K 1K 100 10 EU__N_C m N % OdB..I.
` __
OVFL
I
GATE
[TIMI]
KHz Hz QJOTS 0 IS
LIEII+IEI_ I+RLIIfl
JET" 108 COUNT. ~30dB .-.
fl. PULL TO VAR AMPLITUDE SYNC VICF COUNT. OUTPUT
MAIN FINE . RAMP/PULSE DC OFFSET POWER OUT IN
PULL TO INVERT " `````
.C`P Q" [NW @®@@
+
I
l! Topward DIGITAL FUNCTION GENERATOR 81 12
1O
h
13
FRONT PANEL DESCRIPTION
The following is an explanation of the function of the front panel controls
and connectors. lease
Please refer to Figure 1 for location of each
control/connector.
control/connector.
1. POWER/AMPLITUDE n
" This is the main power switch and the amplitude
adjustment knob. Turning the control clockwise will increase the amplitude.
2. FUNCTION - This bank of switches is used to select the
-- output waveform.
Only one of these switches can be depressed at a time.
3. FREQUENCY CONTROL _
-- This pair of knobs is used to adjust the output
frequency. The frequency is dependent upon the setting of this pair of knobs
and the RANGE/GATE TIME switches (4). Pulling out the FINE control knob
the (3)
will invert the pulse output.
a. RANGE/GATE TIME - This bank of switches is used to select the frequency
range produced. At the same time, the counter gate time is changed.
5. RAMP/PULSE - This knob is used to adjust the duty cycle of the Square or
Triangle waveforms. when the knob is CAL. CCN
turned to EAL. (fully new position), the
duty cycle is fixed at 50%. Otherwise, the duty cycle is adjustable between 5
to 95$.
95%.
_ 5 -
-
B. ATTENUATOR this push button is out, the output/input
-- When this push button is out,
ATTENUATDR -- when the output/input signal
signal is
is
B. by
If the switch is depressed, the Output/Input signal is
unchanged. If the switch is depressed, the Output/Input signal is reduced
reduced by
unchan ged.
30 dB (Generator output / Counter input).
30 dB (Generator output / Counter input).
+10 V
DC OFFSET - This knob allows a variable DC voltage between ~10 V to +10 V
7. DC OFFSET - This knob allows a variable DC voltage between ~1O V to
7.
the knob has to be pulled out for
to be added to the output signal. Note that the knob has to be pulled out for
Note that
to be added to the output signal.
the to affect the signal. When the control is pushed in,
offset to affect the signal.
the offset When the control is pushed in, no offset
no offset
voltage is added.
voltage is added.
for all waveforms.
8. OUTPUT -- This connector provides the output signal for all waveforms.
8. DUTPUT - This connector provides
9. FUNC/CDUNT -- When the the 8 digits DISPLAY (11)
5 DISPLAY (11) shows the
shows the
9. FUNC/CDUNT - When the switch is out,
generator frequency. When the switch is in, the DISPLAY (11) shows
DISPLAY (11) shows the input
the input
generator frequency.
frequency of counter.
frequency of counter.
1OOMH2 frequency counter.
10. COUNTER IN - This is the input connector for the 1DDNH2 frequency counter.
connector
10. COUNTER IN
depressed.
FUNC/CDUNT switch (9) must be depressed.
FUNC/COUNT switch
that shows the output
11. FREQUENCY DISPLAY - This is a 6 digits LED display
11. FREQUENCY DISPLAY - This is a 6 digits LED display that shows the output
frequency of the main generator or the frequency of the counter.
input frequency of the counter.
frequency of the main generator or the input
12.
12. INDICATORS -- DVFL,
INDICATORS - OVFL, GATE, KHz, Hz LEDs enunciate frequency overflow, gate
GATE, KHz, Hz LEDs enunciate frequency overflow, gate
time and frequency units in KHz, Hz.
time and frequency units in KHz, Hz.
-
5 _
13. VCF IN - This input is used to modulate the main frequency to 1000:1 with
13. VCF IN - This input is used to modulate the main frequency to 1ODD:1 with
an external source of 0 -- SVDC.
an external source of 0 -- SVDC.
14. SYNC OUT - This connector supplies a TTL compatible output signal which is
14. SYNC OUT - This supplies a TTL compatible output signal which is
unaffected by either the FUNCTION (2) or AMPLITUDE (1) controls.
unaffected The output
frequency is the same as
frequency is the same as that of OUTPUT signal (8).
_ 7 -
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
Instrument Turn--on
1. Instrument Turn-on
1.
WARNING:
UARNING: Before applying power to your
Before applying power to your 8112
8112 ,, make sure that the input
make sure the input
voltage is set to your power source.
is
A. Connect the 8112 to an AC power source and turn on the POWER switch
(1)-
(1).
2. Main Generator
2.
A. Select the desired waveform using the FUNCTION switch (2). To generate a
A. Select To generate a
ramp or pulse output, turn on the RAMP/PULSE knob (5) and set the desired
desired
duty cycle.
8. Set the desired frequency with the FREQUENCY control (3) and the
B. Frequency RANGE
RANGE
switches (4).
C. Adjust the output amplitude with the AMPLITUDE control (1) to the
to the
desired level. If a very small signal is required, ATTENUATDR
depress the ATTENUATUR
(6).
switch (B) o
Smitch
D. Set DC Offset voltage with the DC OFFSET control (7).
required.
E. Use the SYNC output terminal (14) if TTL compatible level is required.
E. Use SYNC terminal compatible
F. Pull out the INVERT switch (3) to introduce a 180 degree phase shift.
F. Pull out the INVERT switch (3) to introduce a 180 degree phase shift.
Voltage Controlled Frequency
Voltage Controlled Frequency
A.
A. Supply a trim voltage between 0 and 5 VDC to the VCF IN terminal (13).
Supply a trim voltage between 0 and 5 VDC to the VCF IN terminal (13).
The main frequency will be varied over 1DUU:1.
The main frequency will be varied over 1000:1.
Frequency Counter
Frequency Counter
A. Push in FUND/COUNT
A. Push in the FUND/COUNT switch (9).
8. Apply
3. Apply input signal to COUNT IN (10).
C. Select resolution.
C. Select GATE TIME (4) for best resolution.
0.
D. Use
Use ATTANUATDR
ATTANUATUR (6)
(B) for large input signal to avoid damage to
to the
the
instrument.
instrument.
-
g -
OPERATING CAUTIDNS
OPERATING CAUTIDNS
To assure operation within the published specifications,
To assure operation within the published specifications. allow the unit to
allow the unit to
warm up and stabilize for at least 20 minutes.
warm up and stabilize for at least 20 minutes.
Failure to
Failure observe the operating procedure listed below will
will result
result in
in
damage to the unit and void your warranty.
damage TFG-8111
TFB~8111
Do not supply more than 10 Volts ( AC + DC ) into;
into:
Output terminal (8)
VCF IN terminal (13)
SYNC terminal (1h)
(14)
_ 10
_ 10 _
-
THEORY OF OPERATION
Counter Section
1. Counter Amplifier (refer to circuit diagram sheet 1)
A. The buffer amplifier (03 and 04) make up the impedance buffer circuit.
B. USA-U58 form a secondary high voltage gain stage. 05 and 05 form a level
shifter.
Counter Control Circuit (refer to circuit diagram sheet 4)
A. U14 (72160) is a single chip counter IC. U13 and CREE-ERAS form a gate
time selecting circuit.
8. CRaa--CRSA form a decimal point selecting circuit and H2, KHz indicating
circuit.
C. U15A-U160 form a generator frequency display / counter input frequency
display selecting circuit.
D. U1: is a divide~by~ten IC, use for the high frequency input measurement.
Generator Section
1. Tuning Amplifier, Summing Amplifier and Constant Current Source (refer to
circuit diagram sheet 2)
_ 11 _
A. The tuning amplifier is a non-inverting input amplifier (UBA), providing
A. The
a fixed voltage for frequency control MAIN and FINE (3). U88 is a voltage
USE
buffer IE, buffering the variable control voltage of frequency control
MAIN and FINE (3).
B. The summing amplifier (U6 and Q?) sums each current from the VCF input
a?)
and the tuning amplifier output. The output voltage of the amplifier is a
weighted average of the input signal voltages. The frequency control MAIN
., and FINE (3) varies the amount of voltage which determines the generator
output frequency.
E.
C. U7
U? and Q8 generate equalizing positive and negative voltages for the
current source circuit. The current source circuit includes positive
current source (U9 and D9) and negative current source (U10 and 010). The
09) Q10).
positive and negative current values are determined by frequency control
MAIN and FINE (3).
Triangle Generator and Comparator (refer to circuit diagram sheet 2)
The triangle waveform from the triangle generator is apply to the
voltage comparator which acts as an amplitude limiter. As the triangle
waveform alternately crosses the upper and lower switching levels (refer to
R47--R50) of the limiter input,
R47-R50) a square wave is generated at the output of
the voltage comparator (U11). The square is feedback to the triangle
generator where it controls the charge / discharge cycle of
it the triangle
triangle
output.
_ 12
- -
-
3. Sins Shaper and PRE-Amplifier (refer to circuit diagram sheét 3)
3. Sine sheet
'To obtain a
A. `To sine wave. The triangle wave is shaped by a diode
network (CR1B - CR31), in the sine shapper. There are four--stage diodes
(CR16 snapper.
network serves as a non-linear load which varies the attenuation of the
input triangle according to its level.
B. PRE-Amplifier
The DRE-Amplifier is a non-inverting closed loop amplifier. Q15 and Q15
Q16
form the differential input stage that provides DC stability. 017 forms the
Q17
second gain stage. 018 and 019 are the output buffer circuit.
Q18
4. Output Amplifier (refer to circuit diagram sheet 3)
The output amplifier works the same manner as DRE-Amplifier, and provides a
PRE-Amplifier,
50 ohms low output impedance for OUTPUT terminal (8).
-13-
_ 13 -
CALIBRATION
CAUTIUNS:
CAUTIDNS: Services performed by unauthorized person will void your warranty.
To assure the most stable operation possible, your Model 8112 should be
periodically adjusted. To perform the following adjustment procedures, you
will need a Phillips screwdriver, Timer/Counter, Voltmeter, an Oscilloscope
(SDMHz minimum),
(SUMHz Distortion meter, and high frequency (up to 1ODNH2)
1DOMH2) signal
generator. Calibration be performed under liboratory conditions having an
ambient temperature of 18° to 28°c(62° to 82°F), and relative humidity of less
1a" 28"r(62"
then 80%. As you perform this procedure, please refer to the adjustment
location drawing.
locatidn
1. Set the 8112 controls as follows:
RANGE (a) ............................ 1K
FUNCTION (2) ......................... AV
Av
DC OFFSET (7) ........................
0: OFF
DFF
AMPLITUDE (1) ........................ cm (Max.)
cw
RAMP/PULSE (5) .......................
(s) cum (CAL)
cow
FREQUENCY NAIN & FINE (3) ............
MAIN cw (Max.)
2. Connector OUTPUT (8) on Counter 1202 (or equivalent), adjust R127 (ZNHz
(ZMHz
ADJ) to display 2.3KH2 i SUHZ.
2.3KHZ : SUHz.
-
-
14 -
-
3.
3. Select RANGE(4) to 1 K and FUNCTION (2) to SINE.
Select RANGE(4) to 1 K and FUNCTION (2) to SINE. Set the FREQUENCY nAIu &
Set the FREQUENCY MAIN &
FINE (3) to read 1KHz on 1202 . Connect the OUTPUT (8) to a distortion
meter TBA-710 (or equivalent). Adjust R13O (SINE DIST1), R131 (SINE DISTZ) for
TDA-71O R130 DIST1).
minimum distortion.
h. Select FUNCTION (2) to TRIANGLE. Turn the AMPLITUDE (1) to mid location.
4.
1
Connect the output to an voltmeter. Adjust R135 (PA DC) to be DC : 10mV. Turn
the AMPLITUDE (1) to maximum location. Connect the OUTPUT (8) to an
oscilloscope. Adjust R134 (TRI ANPL) to let the Vp-p of triangle wave be 20.8V
AMPL) 20.3V
1" 0.2V.
3 0.2V.
5. Select FUNCTION (2) to SINE. Adjust R132 (SINE DC) to let DC offset be DC
Select FUNCTION t0
OV 1
0V i 10mV. Adjust R133 (SINE AMPL) to let the Vp-p of sine wave be 20.8V 1
Vp--p i
0.2V.
5. Select FUNCTION (2) to SQUARE. Adjust R128 to let the upper level of square
5. Select FUNCTION (2) to SQUARE. Adjust R128 to let the upper level of square
wave be +10.4V 1 O.1V.
+10.4U i 0.1V. Adjust R129 to let the lower level of square wave be
1 O.1V.
-10.4V 3 0.1V.
7. Press the FUNC/COUNT 1ONHz
switch (9) in. Connect a 1OMHz 1 1PPM standard
frequency to the COUNTER input (10). Adjust trimmer capacitor C2 until the
display reads OVFL
000.000 KHZ 1 1 digits (Hz). (with DVFL LED lit). Set the RANGE
KHz
switch (4) to 1 MHz. Apply a 100MHz SOmV signal to COUNT input (10). Adjust
(a) MHZ.
trimmer resistor R125 to let the display be stable.
R126
_ 15 _
TROUBLESHOOTING
TROUBLESHOOTING
If
If ybu are experiencing trouble
ybu are experiencing trouble with your Model
with your Model 8112
8112 Digital Function
Digital Function
Generator, follow the procedures below to find and correct the problem.
Generator, follow the procedures below to find and correct the problem.
1.
1. Power Supply
Power Supply
A. Verify that the voltage selector
A. Varify switch ( S1 ) is set correctly
(115V or 230V) for your available power.
available
8. Turn the POWER (1) on and using an voltmeter measure the voltages at
at
the following points:
the following points:
"3
U3 pin 1 00.000.00.00.
pin1............. +9V11US
+ 9V : 10%
U1 pin 1 ............. +23v 1 10%
............. +23V
Q1
Q1 Collector.......... ~23V : 10$
Collector-oonoooool '23V i 10`
If
If not,
not. check and repair the components from the line cord
cord to
to test
test
points.
points.
C.
C. Measure the voltages at the fOllowing points:
Measure following
U3 pin 3 ...........
........... 5v
+ 5V 1
i 5%
U1 pin 3 ...........
........... +15V
+15U 1
i 5%
5%
O1 Emitter ..........
O1 Emitter .......... ~15V
~15V i
i 5%
5%
02 Emitter ..........
OZ Emitter .......... - 5V
-- 5V 1
1 5%
5%
_ 15 _
_ 15 -
02
U2 pin 3 ........... + 5V 1 5%
If not, check and repair the components of U1, U2, U3, U4, Q1
01 and 02.
2. Counter Amplifier
Set the RANGE switch (4) to 1M. Push FUNC/CUUNT (9) in and the DISPLAY (11)
will blank out. Apply a 1MHz
1MH2 25mV signal to COUNTER INPUT (10). U sing
Using an
oscilloscope, trace this signal at the following points:
1
03 source ............... 1 MHz ......."\J
.......F\, SSmVp-p i 20%
55mVp--p 20%
I+|+g+l+l+x+l+|+l+
04 collector ............ 1 MHz .......'\J
......."b 150mVp-p i 20%
1SDmVp-p
05 pin 7 RDOOIIOIIIIIIIOO 1
U5 MHz
MHZ Wm
......."w 750mVp-p : 20%
750mVp~p 20%
................
pin 2 IIOIIIIIOOCOOIOI 1 MHZ
MHz .......J--L
.......11. 1 Up-p i 20%
Vp--p 20%
pin15 OIOCOOI'ICVOIII. 1 MHz .......n
........Fl 1Vp-p i 20%
1 Vp--p 207:.
05 collector ICICIOIOOOIQ 1
QB collector MHz .......n
.......J_L 1.8 Vp-p 1 20%
Vp--p
U16 pin 3 caoovcoucoovulol 1 MHz .......n
.......J_L 20%
1.8 Vp--p 1.20%
pin1
pin 1 1 MHz .......n
.......,F1 3 Vp-p i 20%
Vp--p 20%
pin 4 ................ 1
pin 4 MHz
MHz ......._F1
......._F1 Vp-p 20%
3.5 Vp--p i 20%
If not, check and repair the components of 03, 04,
04. U5,
05, US U18.
06 and U16.
3. Counter Control Circuit
Refer to circuit diagram sheet a.
The counters gate time were selected by RANGE/BATE switches (a).
RANGE/GATE If there
occurrs functional error,
occurws check and repair U13, U14 or
01` nearby components.
-
_ 17 _
4. Tuning Amplifier and Constant Current Source
4. Tuning Amplifier and Constant Current Source
A.A.
Turn the frequency control MAIN and FINE (3) to CCU (minimum) position.
Turn the frequency control MAIN and FINE (3) to CCU (minimum) position.
Check the voltage ratings of the following points:
voltage ratings of the following points:
U8 pin?................. +1UV i 10%
.i............... +1UV 1
U8 pin1......... ........
oocoaoo-Ioconcco- 0V 1 1DmV
i 1UmV
U7 pin3................. -15V (equals to -Vcc)
pea-ooooo-uo'uoon- --Vcc)
U9 pin2................. +15V (equals to +Vcc)
IOOIIIICIOCCOOOCO
U10 pin2 ooooooooooooooooo `15" (equals to -Vcc)
--15V ~Vcc)
8.
B. Turn the frequency control MAIN and FINE (3) to cw (maximum)
CU position.
Check the voltage ratings of the following points:
ue
UB pin?
pin? .................
leoeoolooeoonooou +10V
+1UV 10%
101
l+|+|+l+l+
l+|+t+l+i+
U8 pin1 .................
ole-conno-eluoool +10V 10%
U7 pin3
pin} .................
nooooeoooooooooeo -
-- 5V 101
10%
U9 pin2
pinZ .................
IOIOIoIoo'Iooeell + 5V 105
10$
U10 pinz
pin2 0.000.000.0000... - 5V
- 5" 10%
101
If not, check and repair the components of 09
us, U6, U7, U7, 08, U9, U10, D9
U8, US, 07,
and Q10.
and Q10.
5.
5. Buffer and
Triangle Buffer and Comparator
Set the RANGE switch (4) to 1 KHz.
Set the RANGE (A) Turn the AMPLITUDE (1) to CU location.
Turn
_ 18 _
Check and be sure that the waveform and voltage of the following points:
Check and be sure that the waveform and voltage of the following points:
Q13
013 Base
Base ODDCIIIIIIIIOOODN
0000.00.00.00... Av ZVp--pi'IUx
ZVP-P i 10%
,` U11
U11 pin4
pin4 concoucoooaavuoaJ--`L
oooooooooooaoooo I1 4.5Vp--p11DX
4.5Vp-p i 10%
ping
pins OOOOQGOOOODOEIOO
oooaasuonlnc;loo f1
I1 3-5Vp"p
3.5Up-p 1 10%
i
If not, check and repair Q11, Q13, Q14 and U11.
If not, check and repair Q11, Q13, Q14 and.U11.
Sine Shepar
6. Sins Shape: and PRE Amplifier
Check and be sure that the waveform and voltage of the following points:
Tp1
TP1 oooooooooooooooooooooo
onloooaoolI-ouaouaoooo AV 2Vp"p
2Vp`p : 10%
Q15
015 Base .o.o..n.....a..."\JU.5Vp--p310%
0000006000069... AU UoBVp`p i 10%
R87 (eaCh
(Each SidE)
Side) 00000-0...
IOOIOIIOI. AU
nu 2Vp*p
2Vp~p i
: 10%
If not,
not. check and repair CR16
CR1B to CR31 or Q15 to 019.
G15
7. Power Amplifier
Set the FUNCTION switch (2) to sine wave. Check and be sure the waveform
and voltage of the following points:
and voltage
020 Base CIIDDOOOIOOI`IIOIN"
ooooooooooooonoo`fik,' 2Vp--p
2Vp"p : 10%
10x
1+
(each side)
R103 (eaCh Side)
R103 av 20.8Vp-p
......... "V ZUoBUp`p
.....a... : 10%
10%
|+
If not, to
check and repair 020 to 024.
_ 1g _
_
A I B 1 C I D
REVISION
REVISION DATE
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R135 D
12;. DC 2
R152
R 132 ,[----
swe DC I O 52:26
O F` R133
O 4!
O'
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--J AMPL.
AMPL-
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Q
R134
R134
9127 [l
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TRI AMPL.
Tm aMHz ADJ.I
EHHz ADll
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at, GENERATOR 1K1 COUNTER
5K: COUNTER
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SINE ,
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R128
R139
me?
R18?
SQUAR
AMPL.
AMPL.
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SQUARE II
R150 0
R130 DC
05 .
SINE
SNE i
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9.57.1
DISTJ ,
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DO NOT SCALE THIS DRAWING TOLERANCE T "
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UNLESS SPECIFIEH ARE
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AMP VOLTAGE
REFERENCE
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3 DISPLAY SNAPER SWITCH OUT?" 3
LATCH A DECOOER
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1/10 1' . 7
COUNTER . + 23 v
-- 23 v
ATT. M." COUNTER
10HZ-1OOMHZ "NE +15V 4
VOLTAGE ~ 15 V
, '/` COUNTER + 5 v
_ 5v
""5 CONTROL
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CKT 5
L--`IFJ 1O MHZ
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REViSION DATE
CIRCUIT DIAGRAM `
COUNTER / "OUNTER AMP "OTESJ
1. ALL. RESISTOR VALUES ARE u OHMS
INPUT .~ g} _ - 4"":`--+5v wmss MARKEDOTHERMSETwKTLOHMS
M--MEGOHHS)
-
04 V"
`04--, C23 4 ~ 2-ALL mmcrron VALUES ARE no wcnorARnDS
'00 + CE" 3. ,5 DENOTE DTGTT GROUND
l 4. {, DENOTE ANALOG GROUMC
Crb :: 5` .i. DEHOYE EARTH Gnouun
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