Diagnostic Testing and Troubleshooting (2635A) 5A

Analog Troubleshooting

Table 5A-4. DC Volts HI Troubleshooting (2635A)

Checkpoint

A3R11 HI

A3U8 pin 23

A3U8 pin 58

Signal Description

Input

Input

Input, DC filter output

Possible Fault

A3K1 through A3K14, A3U4, A3U5, A3U11, A3U12, A3L1, A3L2, A3L3

A3R11, A3K17, A3R42, A3C32

A3U8, A3Q2

5A-12. AC Volts Troubleshooting

Setup the instrument to measure a channel on the 300 mV ac range, and apply a signal to that channel. Then trace this HI signal (referenced to the input channel LO terminal) as described in Table 5A-5.

If the input HI path traces out properly, remove the input from the channel, and trace continuity through the LO path. Check among A3L4 through A3L24, A3K1 through A3K14, A3R43, A3R34, A3K16, and A3U8 pin 13.

Table 5A-5. AC Volts HI Troubleshooting (2635A)

Checkpoint

A3R11 HI

A3Z3 pin 1

A3U6 pin 13

Signal Description

Input

Input

Amplified (X 2.5) input

Possible Fault

A3K1 through A3K14, A3U4, A3U5, A3U11, A3U12 A3L1, A3L2, A3L3

A3R11, A3C31, A3K15

A3U7, A3Z3, A3Q3 through A3Q9, A3C15, A3C16, A3R24, A3A25, A3R26, A3R27, A3R28, A3C23, A3U6, A3Q13, A3U8

A3Z1 pin 2

A3U8 pin 61

DC equivalent of original input

A3Z1, A3U8, A3R20, A3C6, A3C7, A3C10, A3R16,

 

A3R17

 

 

DC equivalent of original input

A3Z1, A3U8, A3R20, A3C6, A3C7, A3C10, A3R16,

 

A3R17

 

 

5A-13. Ohms Troubleshooting

Setup a channel with an open input for the desired ohms range and place the instrument in monitor mode on that channel. Use a meter with high input impedance to measure the open-circuit voltage at the channel input for the ohms range as listed in Table 5A-6. If a high input impedance meter is not available, only the 30-kΩand lower ranges can be checked.

If the proper voltage is not measured, setup a channel on the 300Ω range (open input), and have the instrument monitor that channel. Check for 3V dc with respect to A3TP9, and work through the HI SOURCE and HI SENSE paths as described in Table 5A-7.

If the HI path works correctly, trace continuity through the LO path. Check among A3L4 through A3L24, A3K1 through A3K14, A3R35, A3U8 pin 11, A3R43, A3K16, A3R34, and A3U8 pin 13.

5A-17

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Fluke 2625A 5A-12. AC Volts Troubleshooting, 5A-13. Ohms Troubleshooting, DC Volts HI Troubleshooting 2635A Checkpoint
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2635A, 2625A specifications

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