Products > Test Equipment

Easy way to test the calibration of a DMM (Fluke 45)?

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Majorassburn:
Thank you.  I should have known better. Sorry.

CalibrationGuy:
DISCLAIMER: I don't know Doug, just bought one of his 10V references from voltagestandard.com. Base cost is $140. I dusted the unit off and measured it. Attached is the picture.

Just to put things in perspective for those perusing threads like this one. First of all, I paid over $2,700.00 to calibrate that meter. The cable attached to the meter and the reference box costs more than the reference.

People measuring the Chinese/Asian boxes do NOT (most likely) have the capabilities that my lab has, so PLEASE take their observations with a grain of salt. They are well meaning, but measurement procedures/traceability DO matter. As a hobby, it is great to share experiences, but observations may be misleading without intending to be misleading.

Final thoughts, I'm impressed with Doug's device, I know it's out of the OP's price range, but I just thought I would show you how mine held up as measured with a calibrated, certified, accurate 3458A.

TomG.

shabaz:
It would be a complete waste of time and money spending $140 plus £2700, when the OP could simply send his meter in for a calibration check for under $100.

You'd need to be calibrating a _lot_ of equipment per year before that made any sense.

The OP observed a 20 mV discrepancy between meters. That doesn't require a 10.0000V standard to determine which instrument is faulty.

The OP could simply buy several calibrated meters, new, each year, and it would be cheaper than that.

KungFuJosh:

--- Quote from: shabaz on April 02, 2024, 07:44:10 pm ---It would be a complete waste of time and money spending $140 plus £2700, when the OP could simply send his meter in for a calibration check for under $100.

--- End quote ---

That wasn't his point at all. His point was that the reference for $140 is surprisingly accurate.

Also, where can he get his DMM calibrated for under $100? (besides bdunham7 that offered to do it for free)

CalibrationGuy:
I think you completely missed the point of my reply. As I said, it's out of range of the original poster's budget but I was just showing a contrast to the expense required to definitively get precision data.

TomG.

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