Agilent Technologies 75000 SERIES B, Service Manual, Page: 25 / 68

Tree Switch LO
Channel Measurements
1.
Make Hardware Connections
•
Turn mainframe power OFF
•
Connect DMM as shown in Figure 2-5
•
Turn mainframe power ON
2.
Check for Stuck Channels
•
Send *RST to the FET Multiplexer to open all channels
•
Trigger the DMM with TRIG SGL and note reading
•
Verify the reading is greater than 10 k
Ω
3.
Check Tree Switch LO Closed Channel Resistance
•
Send SCAN:PORT ABUS to enable the tree switches
•
Send CLOS (@
nn
00) to close channel 00 and the A tree switch,
where
nn
is the card number (typically 01)
•
Trigger the DMM with TRIG SGL and note the reading
•
Enter the result in Table 2-1 for Tree A LO
•
Send OPEN (@
nn
00) to open channel 00, where
nn
is the card
number
•
Send CLOS (@
nn
15) to close channel 15 and the B tree switch,
where
nn
is the card number
•
Trigger the DMM with TRIG SGL and note the reading
•
Enter the result in Table 2-1 for Tree B LO
•
Send *RST to the FET Multiplexer
Agilent E1300B/E1301B
Figure 2-5. Tree LO Resistance Test Connections
Verification Tests 2-7