Table 5-9. A/D
Converter/Microcornputer
Checks
-
Step
1
2
3
4
5
6
___
7
8
9
10
11
12
13
14
~
ltem/ComDonent
I
Reauired Condition
U124 pin 38
U119 pin 10
U119 pin 6
U119 pin 5
U119 pin 7
U119 pin 12
U118 pin 6
UllO pin 6
U108B pin 7
U117 pin 6
U105A pin 15
U105A pin 10
U117B pin 9
Turn on power; select 2VDC range.
Short the input.
3.276800MHz Clock
655.36kHz Clock
81.92kHz Clock
40.96kHz Clock
163.84.kHz Clock
1.28kHz Clock
+
5V to
=
OV pulse train, 3psec in
duration every 22psec. (Set
signal to end charge balance pulse.)
Integrator Waveform.
Variable waveform OV to
+
5V.
1
Variable pulse train, OV to
+
5V
Variable pulse train, OV to +5V.
4msec pulses approximately every
150msec. OV to +5V.
50msec and 100msec pulses
Remarks
Crystal Frequency (Y101)
AID tirnebase and
pP
address strobe.
Clocks for U117A.
Minimum pulse
generator signal.
Generates set for
U117A. (proper phase
of
Q4
and Q3 required).
Timebase for real time
pP
interrupt.
S1 input
of
U118B.
Comparator Output
(Charge Balance)
Charge Balance Current
Control.
U124 Timer Input
Single Slope Control
Line
Integrator charge
Balance Control
Table 5-10. Model 197 Static Sensitive Devices
Circuit Designation
0104, Q107
(2108, QllO
Q111, (3112
Q113
u101
U105
U107
U113
U114
U115
U117
U118
u119
u120
u121
u122
U123
U124
Keithley Part
No.
TG-139
TG-I39
TG-139
TG-I39
IC-415
IC-283
IC-347
IC-353
LSI-61
IC-143
IC-337
IC-341
IC-348
IC-351
LSI-62
197-800-**
IC-338
LSI-60
5-13/5-14
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