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Time Interval Multimeter on HP-1725A

 

Picked up an HP-1725A at Xenia this year with a couple of known defects including a non-functional Time Interval Multimeter option. Have the scope working for the most part.?

I have so far not found anything on the operation of the Time Interval Multimeter. Which is odd as most HP stuff is well covered online. Maybe I'm just not typing the correct search terms.

Can anyone help??

Thanks
 

On Sun, Jul 16, 2017 at 5:22 PM, W0MPM.John@...
[hp_agilent_equipment] <hp_agilent_equipment@...> wrote:



Picked up an HP-1725A at Xenia this year with a couple of known defects including a non-functional Time Interval Multimeter option. Have the scope working for the most part.

I have so far not found anything on the operation of the Time Interval Multimeter. Which is odd as most HP stuff is well covered online. Maybe I'm just not typing the correct search terms.

Can anyone help?
the multimeter option is covered by a separate service manual, but the
time interval multimeter
is a standard HP-3476A (or B, afair) with a separate switch to read
either its inputs or the time interval dependent voltage present on
all the 17xx scopes (always, as far as I remember).
So you could use the 3476 service manual and schematics to fix the
multimeter. With a slide switch in the "time interval" position, it
reads the 1725's time interval output, which is covered
by the scope manual.

HTH
Frank IZ8DWF
 

I have a 1742A scope (AFAIK just a 1740A plus the multimeter) with that time interval multimeter on it. The 1742A manual includes basic operating instructions for the multimeter, which is referred to as "option 034." Service information, as an earlier reply noted, is limited to the Time-Interval Decoder A17 (part of the scope), which is covered in Service Sheet 16 of the 1742A manual. I do not have the manual for the multimeter itself but, as mine works, or at least I think it does, I might be able to make tests or measurements on mine if that would help you.

Jeremy?


On Sun, Jul 16, 2017 at 8:22 AM W0MPM.John@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
?

Picked up an HP-1725A at Xenia this year with a couple of known defects including a non-functional Time Interval Multimeter option. Have the scope working for the most part.?

I have so far not found anything on the operation of the Time Interval Multimeter. Which is odd as most HP stuff is well covered online. Maybe I'm just not typing the correct search terms.

Can anyone help??

Thanks


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4.
 

Thanks all. That got me on the path. I think this must be a 3476A as it does not exactly match the 3476B manual available online. Just knowing what it was encouraged the dismantling of same and a quick and superficial alignment per the manual the actual fault was simply very bad connections at the funky fuse/input section.

John

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