开云体育

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of cmjones01
Sent: 01 March 2021 12:00
To: [email protected]
Subject: Re: [TekScopes] Looking for P6042 current probe transformer/hall-sensor replacement instructions

Is this anything like the procedure for the A6302 current probe? I've
got a couple of those here and seem to remember that there is an
adjustment for the offset voltage of the hall effect sensor. In early
models it was a variable resistor, but later it was changed to be a
fixed resistor whose value was specified for the individual hall
effect/current transformer assembly.So if that assembly was replaced,
the resistor would probably need changing too.

Some hall sensors needed a positive offset, some negative, so
sometimes the resistor was connected with one end to the positive
supply rail and sometimes to the negative. In either case, the
existing variable resistor would need to be turned all the way to one
end because it's no longer in use, and presumably the fixed resistor's
value is determined based on the variable resistor being set this way.

Chris

On Mon, Mar 1, 2021 at 11:19 AM benj3867 via groups.io
<benj3867@...> wrote:

@zenith5106 Thanks a lot!

Unfortunately, I do not see the information on how to calibrate R12 :-(
It looks like every manual promises the information will be in another manual. It is highly frustrating.

The P6042 service manual says "...adjustment procedure for R12 supplied with T1. Order Tektronix Part No. 050-0439-00"

The 050-0439-01 instructions you so kindly provided say: "If R11 was installed...adjust R12... to the CLOCKWISE extreme" and "If R13 was installed...adjust R12... to the COUNTERCLOCKWISE extreme", followed by "Refer to Manual Insert for recalibration"

And the manual insert (that you also kindly provided) totally ignores the issue :-( :-(

I can hardly believe that fully clockwise or fully counterclockwise is the final position of the adjustment. If that was the case why use a variable resistor?