Fluke service manual with calibration procedure.
Fluke recommends 5700A calibrator, but we will use poor-man DC standard, EDC MV106.
Initial inspection, "before calibration" state.
On right side - ADC calibration fixture (two-copper terminal jack made from two thermocouple T jacks).
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/1b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/2b.jpg)
Cal sticker is tampered.
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/3b.jpg)
-82°C with tested K-type thermocouple hanging in +25C room temp ain't right.
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/4b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/5b.jpg)
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.
I used copper wire from UTP LAN cable.
0.0000v set - meter shows 20-30C...
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/6b.jpg)
Calibration A-D convertor by providing 80.0000mV and -8.00000mV to inputs.
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/7b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/8b.jpg)
-8.00000mV read as -7996.9 uV, which is in range for calibration requirements of –7995.0 to –8005.0.
Calibration reference point:
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/9b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/11b.jpg)
REF point offset is 3.8C.
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/12b.jpg)
After corrected offset:
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/13b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/14b.jpg)
"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
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/c1b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/e1b.jpg)
2. 0.9193 mVDC / 23.0 °C
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/c2b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/e2b.jpg)
3. -5.7297 mVDC / -190.0 °C
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/c3b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/e3b.jpg)
4. 40.8853 mVDC / 990.0 °C
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/c4b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/e4b.jpg)
5. 48.8382 mVDC / 1200 °C
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/c5b.jpg)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/e5b.jpg)
Same K-type probe reads correct +25.6°C now.
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/10b.jpg)
Thanks for watching
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
![](http://dev.xdevs.com/projects/rnd/repository/entry/Fluke/52-2/small/15b.jpg)
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)