Keithley 194 Instruction Manual page 208

MAINTENANCE
Table 7-15. A/D Converter Checks
SteF
1
ttem/Component
Programming
5
6
U379, U380, U361, U370,
U382, pin ~1
U379, U380, U361, U370,
tJ382, pin 2
U379, U380, U361, U370,
U382, pin 3
Range
u379
7
8
9
LJ380
Range
u379
10 U380
11 Range
12 u379
I? U380
14 Range
15 u379
76 U380
17
U379, pin 6
18 U37Y, pin '14
19 Rate
20 U379, pin ~11
21 Rate
22 U379, pin 11
23 Coupling
24 LJ380, pin 12
25 Coupling
26 U380, pin 12
27 U374, pin 3
28 U374, pin 2
29 U375, pin 6
30 U371, pin 7
31 U37l, pin 14
32 Rate, samples
33
U371, pin 9
____
Required Condition
Program 100 samples, 1OOrsec
rate, continuous trigger, DC
Coupling, filter off.
10~s~ positive pulse when
range button is pressed.
Pulse train when range button
is pressed.
Pulse train when range button
is pressed.
Select 32OmV range.
Pins 4 and 12 low; pin 13
high.
Pin 11 low
Select 3.2V range.
Pins 4 and 13 low; pin 12
high.
Pin 11 low.
Sclcct 32V range.
Pins 4 and 13 low, pin 12 high
Pin 11 high.
Select 200V range.
Pins 4 and 12 high, pin 13 low
Pin 11 high.
High, filter off; low, either
filter on.
High, filter off, 50kHz filter;
low 500kHz.
Program 5fisrc interval.
High logic level.
Program 100psec interval.
Low logic level.
Select ground coupling.
High logic level.
Select DC coupling.
Low logic Icvel.
1OMHz square wave.
5MHz square wave.
10psec positive going pulse
rate.
2psec negative going pulse at
sample rate.
5MHz square wave.
Program 10,000 sample, 1Orsec
interval.
Data burst pulses every lO,,sec
Remarks
All voltages referenced to
analog common (outer shell of
VOLTAGE INPUT jack).
Serial control strobe.
Serial control data.
Serial control clock.
Input amplifier IW control.
Input amplifier rrlay cwltrol.
FET control
Relay control
FET control
Relay control
FET control
Relay control
Filter control
Filter control
8116 bit A/D select.
8116 bit A/D select.
Coupling control
Coupling control
IOMHz clock
5MHz clock
Data shift enable pulse.
5MHz data shift clock.
Even serial data.