Suggestions for Calibration Service in UK

[Chance92]

I am considering getting a Keithley 2010 7.5 digit DMM calibrated and adjusted. I wonder if anyone got any suggestions for service providers in UK? How much would it normally cost?

[strawberry]

for personal use it would be reasonable to find someone with recent calibrated meter/reference
during transportation could loose some ppm anyway (humidity , vibration, temperature, radiation..)

[mendip_discovery]

CMR I have found have good prices, good uncertainties, quick turn around.

Not my lab but I do use them myself. I would suggest you as for thier best Uncertainties otherwise they use the not so good calibrator.

[Chance92]

for personal use it would be reasonable to find someone with recent calibrated meter/reference
during transportation could loose some ppm anyway (humidity , vibration, temperature, radiation..)

Thanks for your suggestions. Unfortunately, I don't know anyone with such equipment living close to me.

[Chance92]

CMR I have found have good prices, good uncertainties, quick turn around.

Not my lab but I do use them myself. I would suggest you as for thier best Uncertainties otherwise they use the not so good calibrator.

Thanks. I'll give them a call.

[strawberry]

it is good to have some stable ref to do routine/sanity check
calibration is valid till some component fail/drift

[Chance92]

it is good to have some stable ref to do routine/sanity check
calibration is valid till some component fail/drift

I've tested the 2010 with a recently calibrated calibrator and confirmed the meter is out of spec. However, the calibrator is not accurate enough to serve as a standard for adjusting the DMM. Then again, this DMM was last calibrated about 22 years ago.

[strawberry]

measure within spec :
yes : do nothing
no : do logging
instrument is stable :
yes : calibrate
no : repair
repair successful :
yes : well done
no : road roller

[Kleinstein]

Before sending the meter out to calibration / adjustment, I would suggst doing some more testing.
A first point is checking for the input current / bias - this can indirectly cause errors and not als calibration services test this. The test is also relatively simple and does not need special equipment.
Another point is stability of the readings, at least in a few ranges, depending on the stable references on can get. This could be something like a few good resistors and maybe a 7 V reference that is reasonable stable over maybe 1-3 months.
A few points (e.g. resistors) could be checked in 2 ranges to check consistancy.

With an old Keithly 20xx meter one may consider checking the age of the filter capacitors and depending on the age consider an exchange. There are quite a few reports of leaking capacitors doing damage with these meters. At the very least check if they already leak.

[iJoseph2]

Not a recommendation...

https://glanfordelectronics.com/equipment-calibration/calibration-prices.html

I'm just aware of their existence as they're reasonably close to me.
Prices are on their website.

[Chance92]

With an old Keithly 20xx meter one may consider checking the age of the filter capacitors and depending on the age consider an exchange. There are quite a few reports of leaking capacitors doing damage with these meters. At the very least check if they already leak.

Hi Kleinstein. Thanks for your suggestions. Most of the caps look alright. One of them looks strange. The skin seems to be damaged near the pins. The cap measured fine though (470 uF rated, 430 uF measured). Does it look like a leaking cap?

[Kleinstein]

The mark on the capacitor does not look like a leaking cap. Leackage is essentially always at the leads / rubber plug. It is more like a mark from a soldering iron hitting it. So the capacitors could already be replaced. Not sure if there is a data code visible on the capacitors to see the approximate age in comparison to most of the chips.

[strawberry]

430 seems a bit dry but should be fine, if replaced even better. ESR in spec?
near heating components capacitors wear down faster


https://www.eevblog.com/forum/testgear/keithley-2010-preliminary-porn/