Agilent Technologies 75000 B Series Service Manual page 25

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
Figure 2-5. Tree LO Resistance Test Connections
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 kΩ
3.
Check Tree Switch LO Closed Channel Resistance
• Send SCAN:PORT ABUS to enable the tree switches
• Send CLOS (@nn00) 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 (@nn00) to open channel 00, where nn is the card
number
• Send CLOS (@nn15) 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
Verification Tests 2-7