Service manual

Table 2-1. Measured Protection Resistor Values
Resistor
Measured Value (Ω)
Resistor
Measured Value (Ω)
R38
R39
R40
________________
________________
________________
R41
R42
R43
________________
________________
________________
Chs 00-47 and 90-92
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 R43 from DMM reading
• Enter the result in Table 2-2 for Channel 00 HI
3. Repeat for Channels 01 - 47 HI
• Repeat step 2 for channels 01 - 47 HI
• Use CLOS (@nncc) and OPEN (@nncc), where nn =
card # and cc = channel # (omit leading zeroes in nn)
Figure 2-3. Ch 00-47 HI Measurement Connections
Verification Tests 2-5