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Old 06-10-2014, 09:30 AM
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Talking Fixing Fluke 52 II thermometer

I'm back home, and what we have here for today?



Any guess of what I'm doing here?
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Old 06-10-2014, 11:22 AM
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performing a calibration
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Old 06-10-2014, 12:40 PM
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Initial inspection, "before calibration" state.
On right side - ADC calibration fixture (two-copper terminal jack made from two thermocouple T jacks).



Cal sticker is tampered.



-82C with tested K-type thermocouple hanging in +25C room temp ain't right.



Closeup for connector used for voltage source (EDC MV106 DC standard calibrated to Keithley 2001 with Tek cal 5.FEB.2014) connection to Fluke 52-2 inputs

0.0000v set - meter shows 20-30C...



Calibration A-D convertor by providing 80.0000mV and -8.00000mV to inputs.



-8.00000mV read as -7996.9 uV, which is in range for calibration requirements of –7995.0 to –8005.0.

Calibration reference point:



REF point offset is 3.8C.



After corrected offset:



"After calibration" Performance test values (K-Type Thermocouple) with icebath.
Channel 1 on left, channel 2 on right:

1. 0.0000 mVDC / 0.0 C



2. 0.9193 mVDC / 23.0 C



3. -5.7297 mVDC / -190.0 C



4. 40.8853 mVDC / 990.0 C



5. 48.8382 mVDC / 1200 C



Same K-type probe reads correct +25.6C now.



Thanks for watching



P.S.

Used gear:

Calibrated Keithley 2001 Multimeter (5.FEB.2014)
Keithley 2002 Multimeter (10.APR.2007)
Calibrated EDC MV106 DC Voltage standard +-30ppm/C (8.FEB.2014)
Calibrated Keithley 2400 Sourcemeter (14.JAN.2014)
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Old 06-10-2014, 01:01 PM
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wow, a lot of work to calibrate the measurement instrumentation, TIN Should give thanks by not having to do this every day hahaha
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Old 06-10-2014, 01:22 PM
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If you want a "real" broken Fluke 52 II for repair, just let me know.
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Old 06-10-2014, 11:30 PM
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Awesome guide Tin, appreciated

Now I can use my lovely fluke again thanks man.

Last edited by hiwa; 06-11-2014 at 02:32 AM.
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