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

[Charles Black]

Hi Stephen,

Thanks for the info on the 4920M. It might be that I should pass on this 
but it is nice to know that it is probably working. If I don't have the 
necessary items needed for calibration it might still be a good source 
uncalibrated.

I was hoping that the 4920 had better minimum voltage out steps than my 
present Rigol 4062 for 3458a AC calibration. I have two EL 1400 0.25V 
voltage thermal converters that I was trying to use in a test setup but 
they had such a low voltage range that I was forced to use my ATV-60 
attenuator. It all kind of worked but a 0.1 db minimum step  is a little 
course for easy use. The Rigol also suffers from this malady.

Charlie

On 8/31/2014 1:06 PM, Stephen Grady wrote:
> 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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>>
>
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