Keithley 7022, Instruction Manual

Page: 78 / 107

Service Information
6-10
Channel functionality test
1. As shown in Figure 6-8, connect the suspect input or
output channel to an output or input channel that is
known to be functioning properly. The internal 5V
supply must be used.
2. From the front panel of the mainframe, turn on (close)
the output channel. Verify that the display indicates that
the output channel is on (closed). Keep in mind that the
output can be high (positive) or low (negative) when the
channel is turned on, depending on the logic
configuration.
3. Place the mainframe in the “read input channels” dis-
play mode. Verify on the display that the input channel
is off (open).
4. On the mainframe, turn off (open) the output channel
and verify on the display that the input channel turns on
(closes).
5. On the mainframe, return the instrument to the normal
display mode and verify on the display that the output
channel is off (open).
Figure 6-8
Testing an input or output channel
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
!
115V
!
90-110V
105-125V
180-220V
210-250V
A
B
C
1 3 4 5 6 2
Model 7022
H
Model 6517A
Model 7025
Unterminated
Triax Cable
(Red)
Banana to Banana Cable
Unterminated
Banana Cables
Source V and
Measure V/I
H
Columns
Jumpers
(1 of 5)
Rows
H L H L H L H L H L H L
H
L
H
L
H
L
D
H
L
E
H
L
Chassis Ground
is accessible
at 7001/7002 rear
panel
Ground Link
Removed
Figure 6-7
Common-mode isolation testing
Output Channel
Internal connections:
Internal voltage source (+5V) selected.
Pull-up resistor installed.
OUT
GND
Input Channel
IN
GND
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