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HYDRA
Service Manual
5-28
5-23. 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 5-9 (software version 5.4 and higher) or 5-10 (software versions lower
than 5.4.) Retrieve the constant with the following command:
CAL_CONST? xx (where xx denotes the calibration constant number)
Table 5-10. Calibration Faults (for sotware versions lower than 5.4)
Input Range
Calibration Constant
Related Components
Number Acceptable Values
DC Volts
0.09000V
0.9000V
0.29000V
2.9000V
29.000V
290.00V
100 mV
1V
30 mV0
3V
30V
300V
1
2
3
4
5
6
1.0315 to 1.1565
1.0340 to 1.1540
1.0315 to 1.1565
1.0315 to 1.1565
1.0340 to 1.1640
1.0290 to 1.1590
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2, A3Z4
A3VR1, A3Z2, A3Z4
AC Volts (1 kHz)
0.02900V
0.29000V
0.2900V
2.9000V
29.000V
290.00V
300 mV
300 mV
3V
3V
30V
300V
7
8
9
10
11
12
-0.001 to 0.001
1.0040 to 1.1840
-0.01 to 0.01
1.0040 to 1.1840
1.0040 to 1.1840
1.0040 to 1.1840
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
Ohms
290.00Ω
2.9000 kΩ
29.000 kΩv
290.00 kΩ
2.9000 MΩ
2.9000 MΩ
300Ω
3 kΩ
30 kΩ
300 kΩ
3 MΩ
10 MΩ
13
14
15
16
17
18
0.9965 to 1.0115
0.9975 to 1.0125
1.0015 to 1.0165
0.9965 to 1.0115
0.9990 to 1.0090
0.9990 to 1.0090
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
Frequency
10.000 kHz
2.9V rms
19 0.9995 to 1.0005 A3Y2
5-24. Replacing the EEPROM (A1U1)
The EEPROM provides nonvolatile storage for the instrument serial number, some of the
instrument configuration, and all calibration information. If the EEPROM is replaced
during repair, the new EEPROM 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.