Agilent Technologies Agilent E1345A, Service Manual

Page: 27 / 84

Chs 00 - 07 and 90
HI Measurements
1.
Make Hardware Connections
–
Turn mainframe power OFF
–
Connect DMM leads as shown in Figure 2-3
–
Turn mainframe power ON
2.
Measure Channel 00 HI Resistance
–
Send
*RST
to multiplexer
–
Send
CLOS (@nn00)
to close chan 00, where
nn
= card #
–
Trigger the DMM with
TRIG SGL
and note reading
–
Send
OPEN (@nn00)
to open channel 00
–
Subtract measured value of R20 from DMM reading
–
Enter the result in Table 2-2 for Channel 00 HI
3.
Repeat for Channels 01 - 07 HI and Channel 90 HI
–
Repeat steps 1 and 2 for channels 01 - 07 HI and 90 HI
–
Use
CLOS (@nncc)
and
OPEN (@nncc)
, where
nn
=
card # and
cc
= channel # (omit leading zeroes in
nn
)
–
For Channel 90 HI, subtract combined value of R20 + R26
Ch 00 - 07 and 90
LO Measurements
1.
Make Hardware Connections
–
Turn mainframe power OFF
–
Connect DMM leads as shown in Figure 2-4
–
Turn mainframe power ON
2.
Measure Channel 00 LO Resistance
–
Send
*RST
to multiplexer
–
Send
CLOS (@nn00)
to close chan 00, where
nn
= card #
–
Trigger the DMM with
TRIG SGL
and note reading
–
Send
OPEN (@nn00)
to open channel 00
–
Subtract measured value of R21 from DMM reading
–
Enter the result in Table 2-2 for Channel 00 LO
Figure 2-3. Ch 0-7 and 90 HI Measurements Connections
Chapter 2 Verification Tests 25