Diagnostic Testing and Troubleshooting (2635A) 5A

Calibration Failures

5A-23. Retrieving Calibration Constants

If a calibration error is suspected, the stored constant can be retrieved and verified over the computer interface. Acceptable calibration constants for each function and range are listed in Table 5A-9. Retrieve the constant with the following command:

CAL_CONST? xx

(where xx denotes the calibration constant number)

The entire calibration of the Hydra Databucket can be retrieved from the instrument in tabular form by using the following command:

EEM_LIST?

The instrument response from this command shows the currently used FLASH memory block and page numbers, and each calibration constant in hexadecimal and floating point with a description of what function and range each calibration constant is used on. The following is a sample of a typical EEM_LIST? response:

Page 10 of Parameter Block 1 is currently in use.

Register Hex Value F.P. Value Description

---------------------------------------------------------------

0-1

0x3F8A847A1.

0821679100

Millivolt DC Gain

2-3

0x3F8A5D751.

08097711

Volt DC Gain

4-5

0x3F8A63571.

0811566300

Millivolt DC Gain

6-7

0x3F8A5BC01.

08092503

Volt DC Gain

8-9

0x3F8B4F571.

088358830

Volt DC Gain

10-11

0x3F8A7C8A1.

0819256150/300

Volt DC Gain

12-13

0xB8F20A00

-0.0001154300

Millivolt AC Offset

14-15

0x3F8A51191.

0805999300

Millivolt AC Gain

16-17

0xBA974800

-0.00115423

Volt AC Offset

18-19

0x3F8A7F291.

08200563

Volt AC Gain

20-21

0xBC3A6C00

-0.011378330

Volt AC Offset

22-23

0x3F8A863A1.

082221330

Volt AC Gain

24-25

0xBDE81400

-0.1133194150/300

Volt AC Offset

26-27

0x3F8AC8861.

0842445150/300

Volt AC Gain

28-29

0x3F808EAB1.

0043539

300 Ohm Gain

30-31

0x3F8097591.

0046188

3 Kilo Ohm Gain

32-33

0x3F80FD781.

0077353

30 Kilo Ohm Gain

34-35

0x3F7FF46C0.

9998233

300 Kilo Ohm Gain

36-37

0x3F7FFDD00.

9999666

3 Mega Ohm Gain

38-39

0x3F7FFDD00.

9999666

10/30 Mega Ohm Gain

40-41

0x3F80073D1.

0002209

Frequency Gain

42

0x000F

 

Calibration Status

43-44

0xAAAAAAAA

 

Product Serial Number

45

0xFFFF

 

Unused EEM Register #1

46

0xFFFF

 

Unused EEM Register #2

47

0xFFFF

 

Unused EEM Register #3

48

0x62F4

 

CRC of EEM Data (0x62F4)

5A-24. Replacing the Flash Memory (A1U14 and A1U16)

The FLASH Memory provides nonvolatile storage for the instrument serial number, the instrument firmware, and all calibration information. If the "boot" firmware in FLASH memory has been determined to be faulty, A1U14 and A1U16 must both be replaced.

Many other problems may be corrected by loading new instrument firmware in the instrument (see the section entitled "Updating the 2635A Instrument Firmware" in Section 4 of this manual), or recalibrating the instrument.

If the FLASH Memories must be replaced during repair, the instrument must be recalibrated. The new FLASH Memory can be programmed with the 7-digit serial number found on the rear panel of the instrument or any 7-digit identifier of your choosing. Note that the serial number is not programmed prior to shipment from the factory.

5A-29

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Fluke 2625A, 2635A service manual 5A-23. Retrieving Calibration Constants, 5A-24. Replacing the Flash Memory A1U14 and A1U16
Page 228 Page 230

2635A, 2625A specifications

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