Hobbyist.

The eBay bidding on the Fluke 335D is already going up ...

I still own the 335A (though how long for is another question). 

Both the above are spares/repair as is the Efratom FRT (no lock).

The vendor also has Fluke 845 and Fluke 887 and scarily also a 540B, but I 
can't afford all that lot in one bite :(

I have a Keithley 155 Null Detector how does that rate?

Thanks
Dave
-----Original Message-----
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf 
Of WB6BNQ
Sent: 15 December 2012 02:31
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 335A versus HP 740B

David,

The difference between the 335 A or D model I don't recall off the top of my 
head specifically, but they were improvements.  I would probably take the D but 
really either one is good, assuming, of course, they are working.

You might want to consider getting both of them.  They can handle being 1000 
volts above ground.  So with two you have a calibrated DC voltage up to 2000 
volts.

You still need a good null meter.  While the 335's null meter is OK, it does 
not hold a candle to the Fluke 845 when it comes to isolation.

Are you just gathering this stuff for your own use as a hobbyist or are you 
intending to get into some commercial concern ?

Bill....WB6BNQ


"David C. Partridge" wrote:

> And also what is the difference between a 335A and a 335D?
>
> Thanks again,
> Dave
> -----Original Message-----
> From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] 
> On Behalf Of David C. Partridge
> Sent: 15 December 2012 02:16
> To: 'Discussion of precise voltage measurement'
> Subject: [volt-nuts] Fluke 335A versus HP 740B
>
> Both DC Voltage standards up to 1000V or so, and also null differential 
> meters.
>
> Also both being sold by the same vendor as the other stuff
>
> Do the assembled mavens have a view as to which is preferable?
>
> Thanks
> Dave
>
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