IMPORTANT: hp3478a_write_calibration.py will overwrite the calibration data of your multimeter!!! Make sure that you know what you're doing before using it!
Simple PyVISA scripts to dump and restore the calibration data of an HP 3478A multimeter.
Check out my HP 3478A Multimeter Calibration Data Backup and Battery Replacement blog post for more info.
To use, first install the linux-gpib kernel drivers, and install pyvisa and pyvisa-py as follows:
pip3 install pyvisa
pip3 install pyvisa-pyThen edit the hp3478a_read_calibration.py script to point to the correct VISA interface. The default
script points to GPIB::7.
On my machine, running the script results in the following:
Fetching calibration data...
Contents of calibration RAM:
0000: 40 40 40 40 43 40 48 42 4f 44 44 40 4d 4b 40 40 @@@@C@HBODD@MK@@
0010: 40 40 43 43 42 4f 45 43 40 4e 40 40 40 40 40 40 @@CCBOEC@N@@@@@@
0020: 43 42 4f 44 40 40 4e 47 49 49 49 49 49 47 42 40 CBOD@@NGIIIIIGB@
0030: 4f 43 4c 4a 4b 49 49 49 49 49 49 42 40 4e 4f 4e OCLJKIIIIIIB@NON
0040: 49 4c 40 40 40 40 40 40 40 40 40 40 40 4f 4f 49 IL@@@@@@@@@@@OOI
0050: 49 48 46 40 49 42 4e 4e 40 4c 4a 4c 49 49 49 49 IHF@IBNN@LJLIIII
0060: 49 45 41 4c 40 45 4e 4a 4d 49 49 49 49 49 48 41 IEAL@ENJMIIIIIHA
0070: 4c 41 4f 41 4a 4c 40 40 40 40 40 40 41 4c 4f 43 LAOAJL@@@@@@ALOC
0080: 40 4e 40 49 49 49 49 49 49 41 4c 4d 42 4e 49 4f @N@IIIIIIALMBNIO
0090: 49 49 49 49 49 49 41 4c 4d 44 42 4a 49 49 49 49 IIIIIIALMDBJIIII
00a0: 49 49 49 41 4c 4e 4c 4d 49 45 49 49 49 49 49 49 IIIALNLMIEIIIIII
00b0: 41 4c 42 41 4f 4a 4a 40 40 40 40 44 42 43 40 40 ALBAOJJ@@@@DBC@@
00c0: 43 4c 4e 47 40 40 40 40 40 44 43 40 41 4c 43 4e CLNG@@@@@DC@ALCN
00d0: 48 40 40 40 40 40 40 40 40 40 40 40 4f 4f 49 49 H@@@@@@@@@@@OOII
00e0: 48 46 40 49 43 4e 43 41 41 4c 40 40 40 40 40 40 HF@ICNCAAL@@@@@@
00f0: 40 40 40 40 40 40 4f 4f 40 40 40 40 40 40 40 40 @@@@@@OO@@@@@@@@
Checksum for all calibration values:
Checksum 0: 0xff PASS
Checksum 1: 0xff PASS
Checksum 2: 0xff PASS
Checksum 3: 0xff PASS
Checksum 4: 0xff PASS
Checksum 5: 0xff PASS (unused, FAIL is OK)
Checksum 6: 0xff PASS
Checksum 7: 0xff PASS
Checksum 8: 0xff PASS
Checksum 9: 0xff PASS
Checksum 10: 0xff PASS
Checksum 11: 0xff PASS
Checksum 12: 0xff PASS
Checksum 13: 0xff PASS
Checksum 14: 0xff PASS
Checksum 15: 0xff PASS
Checksum 16: 0xff PASS (unused, FAIL is OK)
Checksum 17: 0xff PASS
Checksum 18: 0xff PASS (unused, FAIL is OK)
Writing calibration data to 'hp3478a_cal_data.bin'.
On your HP 3478A, the calibration data will obviously be different...
Note that in the printout above, each calibration value has an offset of 64. The actual RAM values go from 0 to 15, not from 64 to 79.
To restore the calibration data, just run hp3478a_write_calibration.py.
Make sure that the CAL ENABLE switch on the front panel is set to ON.
I added calibration data read/write functionality to pymeasure.
The pymeasure_calibration_read_write.py script show how to use it.
In addition to installing pyvisa and pyvisa-py, you also need to install pymeasure to
run the script:
pip3 install pymeasure
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