[volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

[Stephen Grady]

Charlie,


The "Error Ur" is an under-range error; you have to apply an input above 10% of the range before it will display a reading. The 4920's are a very nice instrument. Their only problem is that they are all so old that they are reaching the stage where some components are drifting excessively or failing. I have come across 4920's that are drifting a little (more than there spec) between cals (and yes they need to be cal'd annually), another 4920 I came across had an intermittent failure in one of its power supplies.

Kind Regards,

Stephen Grady
Sydney Australia

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of Charles Black
Sent: Monday, 1 September 2014 3:19 AM
To: ben at veritechmeasurements.com.au; Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 4920M, AC Voltmeter, for sale on ebay - 1 day left

Hi Ben,

I am going to check this out today to find if it might be helpfull around here for my AC calibration. It has an error message: "Error Ur" 
so some fixing is going to be needed. On the back it says it's got Option 80, whatever that is.

Charlie


On 8/31/2014 5:37 AM, ben wrote:
> Hello all,
> Just a heads up. I noted there is a lonely Datron / Wavetek 4920M AC 
> voltmeter for sale on ebay, starting at US$650 (ending in 1 day !). I 
> have little idea of its true working state or not (picture shows it powered on).
> If fully working it would be a good buy for an AC voltmeter that is, I 
> reckon, better than an HP 3458A. Only drawback with these models is 
> the voltage input shell is always earthed, not floating. I have two of 
> these 4920M's already, not really tempted by a third. I have a paper 
> copies of operator, calibration, and service manual if anyone interested.
>
> regards,   ben.
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