[volt-nuts] Screws in bottom of 3457A

[Jerry Hancock]

John, I measured the threads to be metric at .7mm pitch.  I believe it to be an M4 x .7 x 49mm though most likely a 50mm will work or even a 48mm (length).


> On Jun 10, 2017, at 3:02 PM, Chuck Harris <cfharris at erols.com> wrote:
> 
> HP has been metric for years.
> 
> Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
>> I've done something rather stupid with my 3457A. I took it apart to replace
>> the battery, and then seem to have mislaid the screws that hold the thing
>> together. As far as I can see, there are 4 screws in the base. The problem
>> is, I don't know what type they are. Could anyone with a 3457A tell me the
>> type - a photo with dimensions on emailed to me would be great. I'm
>> guessing these will be an American thread of some sort. I can get these in
>> the UK, although not quite as readily as metric. But of course its
>> difficult if you don't know what you want.
>> 
>> FWIW, I decided not to change the battery. Having visited Keysight in
>> February, their cal lab manager said if I asked for it, they would check
>> the calibration of the instrument before replacing the battery, then
>> replace the battery at zero cost*, then calibrate it. So I would get before
>> and after data anyway.
>> 
>> * This assumes the battery is not very expensive. If the battery was
>> expensive, I'd have to pay for the battery.
>> 
>> My 3457A has not seen a cal lab in a couple of decades, so I think it
>> deserves a check over.
>> 
>> Dave
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