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Calibration

 

First post & maybe this is OT and if so please delete it.

I am looking for the calibration procedure for a:
Amprobe 37XR-A? DMM.

When I check it on my calibration source, everything is good but the resistance measurements which read low.
I did check the calibrator with my Fluke 189 & they are spot on.

I already called Amprobe/Fluke & they were no help.

Thanks.
--
-Bob
 

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If you do not have the operation manual it is here:


?I cannot find a reference for the calibration/service manual. ?There are several references to companies doing calibration on this instrument.
Don Bitters

 

After some pleading, Chris at Fluke, went above & beyond and was able to send me the full calibration procedure for the 37XR-A.
Ironically, Resistance is the only mode that is not calibratible in any way.
--
-Bob

 

How low are the readings and just on one scale or all scales? New battery, right?

Just a thought looking back at one of my flukes that had a strange resistance error on the lowest scale.? They used a resistor divider in a SIP package which turned out to have a cold solder joint on one lead.? Once open, the low range was off by a few ohms but worked otherwise. Touching the probes together gave a reading several ohms higher than usual.

A schematic would be very helpful to see how resistance is sensed by the meter. Since the accuracy should always remain very good, it is possible the problem is mechanical with the PCB unless the resistance range was exposed to a high voltage or current.

 

If you do not have the user manual it is?

 

All resistance ranges are low and the battery was tested good & measures over 9vdc.

According to the calibration procedure, the 37XR- A I have is just barely out of spec.

So it is not a big deal for the stuff I do, I just wanted to make the 37XR-A all it can be and apparently it is.

Thanx for the comments.? We can close this out.

--
-Bob

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