HYDRA

Service Manual

Table 5-5. AC Volts HI Troubleshooting

Checkpoint

A3R11 HI

A3Z3 pin 1

A3U6 pin 13

A3Z1 pin 2

A3U8 pin 61

Signal Description

Input

Input

Amplified (X 2.5) input

DC equivalent of original input

DC equivalent of original 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, A3U8, A3R20, A3C6, A3C7, A3C10, A3R16, A3R17

A3Z1, A3U8, A3R20, A3C6, A3C7, A3C10, A3R16, A3R17

5-13. 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 5-6. If a high input impedance meter is not available, only the 30-kΩand lower ranges can be checked.

Table 5-6. Ohms Open-Circuit Voltage

Range

300Ω

3kΩ

30kΩ

300kΩ

3MΩ

10MΩ

Voltage

3V

1.3V

1.3V

3V

3V

3V

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 5-7.

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.

Table 5-7. Ohms HI Troubleshooting

Checkpoint

A3U8 pin 14

A3R10 HI SRC

Channel HI

A3U8 pin 23

A3U8 pin 58

Signal Description

Ohms Source

Ohms Source

Ohms Source

Ohms Source

Ohms Source filter output

Possible Fault

A3U8

A3R10, A3K16, A3RT1, A3Z4, A3Q10

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

A3R11, A3K17, A3R42, A3C32

A3U8, A3Q2

5-18

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Fluke 2635A, 2625A Ohms Troubleshooting, AC Volts HI Troubleshooting Checkpoint, Ohms Open-Circuit Voltage Range

2635A, 2625A specifications

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