HYDRA

Service Manual

Table 4-12. 4-Wire Ohms Calibration (5700A)

Command

CAL 3

Action

Puts Hydra in OHMS Calibration

Note

With the following CAL_REF commands, send the actual resistance value (e.g., xxx.xxxxx) displayed by the 5700A.

CAL_REF xxx.xxxxx

CAL_STEP?

Source 190Ω from the 5700A. Then wait 4 seconds for the 5700A to settle.

Hydra computes calibration constant 15 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 13.)

Note

If the input is incorrect, the "!>" response signifies that a Device Dependent Error has been generated. The calibration step could not be executed.Verify that the input to Hydra channel 1 is the correct value. Also verify that the 5700A is in OPERATE mode. If the input is correct, Hydra may require repair.

CAL_REF xxxx.xxxx

CAL_STEP?

CAL_REF xxxxx.xxx

CAL_STEP?

CAL_REF xxxxxx.xx

CAL_STEP?

CAL_REF xxxxxxx.x

CAL_STEP?

Source 1.9 kΩ from the 5700A. Then wait 4 seconds for the 5700A to settle.

Hydra computes calibration constant 16 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 14.) Source 19 kΩ from the 5700A. Then wait 4 seconds for the 5700A to settle.

Hydra computes calibration constant 17 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 15.) Source 190 kilohms from the 5700A. Then wait 4 seconds for the 5700A to settle.

Hydra computes calibration constant 18 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constant 16.) Source 1.9 megohms from the 5700A. Then wait 4 seconds for the 5700A to settle.

Hydra computes calibration constants 19 and 20 and returns the calibrated reading. (For software versions lower than 5.4, this step computes calibration constants 17 and 18.) Now set the 5700A output to 0.

4-31. Using the PC Compatible Firmware Loader Software

This procedure uses the 2635A Embedded Firmware Memory Loader Package for closed-case updating of the internal firmware in the 2635A. This software runs on an IBM PC or equivalent using the RS-232 interface. It consists of the following files:

∙An executable file (LD2635.EXE)

∙A text file containing usage information (README.TXT)

∙A 2635A instrument firmware file (DB_6_9.HEX for example)

∙A batch file to load the firmware via COM port #1 (LOADC1.BAT)

∙A batch file to load the firmware via COM port #2 (LOADC2.BAT)

4-28

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Fluke 2635A, 2625A service manual Using the PC Compatible Firmware Loader Software, Wire Ohms Calibration 5700A Command
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2635A, 2625A specifications

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