Re: Multimeter Calibration and Voltage Referance


Bob Albert <bob91343@...>
 

I have a gold standard voltmeter, HP 3456A that takes care of everything. I actually have three very accurate voltmeters but the HP is the one on my bench that I use for a master reference.  It's good to better than .01% for most voltages and resistance.  It also measures AC volts.  For current I simply use a measured low value wire wound resistor and calculate the current.  For passive components I use the GR 1658 which is good to maybe 0.1% or better.  For frequency I have a nice counter with OCXO that I occasionally check with WWV.
These instruments are available used (and uncalibrated) for very reasonable prices.  Even uncalibrated they are far better than the everyday type of VOM, including the inexpensive digital ones.
Bob

On Friday, March 27, 2015 10:27 AM, "'Bene's Mails' bene.dienst@... [TekScopes]" <TekScopes@...> wrote:


  To calibrate my whole equipment, I only drive to work!

regards
Ben

From: mailto:TekScopes@...
Sent: Friday, March 27, 2015 6:10 PM
To: TekScopes@...
Subject: Re: [TekScopes] Multimeter Calibration and Voltage Referance

For voltage reference, I use a module I bought on eBay for $20 US. Just search eBay for "voltage reference ad584" (without the quotes) and you will get many examples. Some use the AD584L chip which is laser trimmed to +/- 5 mVolts which is good enough for most of us. Mine came with a hand written "final value" paper that gave the values to 5 digits.
If you want a step up, check out Low Cost Precision Voltage References . This seller offers several great references from simple DC voltage up to voltage (AC and DC), resistance, current, and frequency for $80 US.

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| Low Cost Precision Voltage ReferencesCheck out http://voltagestandard.com! voltagestandard.com low cost precision DC voltage references |
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| View on www.voltagestandard... | Preview by Yahoo |
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From: "henasau@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Friday, March 27, 2015 5:12 AM
Subject: [TekScopes] Multimeter Calibration and Voltage Referance

It would be interesting to know how members go about and keep in check accuracy of their workshop multimeters. I have 5 multimeters and each is giving slightly different results. It would be nice to calibrate them to a known voltage standard.

Of course I could pay the money and have them calibrated with the certificate but I am just wondering if there is an easy home made method to address this.

Henryk



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