[volt-nuts] A Fluke 732A: Return it or keep it?

[Orin Eman]

Best I can tell, the 3457A 1 year spec is 0.0040% of reading + 19 counts
for 6.5 digits on the 30V scale, 100PLC, cal temp +/- 5 deg C.

Your 10.00036 V reading is therefore +/- 0.00059 V.  I'd say you can't
really tell with the 3457A whether the 732A is close or not.

Orin.


On Fri, Mar 7, 2014 at 4:19 PM, Michael Hong <mikeyahee at yahoo.com> wrote:

> Hi nuts,
> This is my first message. Just reading the posted messages is a big
> learning to me so I didn't post but instead trying to read all.
>
> Here is my issue.
>
> I received a Fluke 732A yesterday which was purchased from an eBay seller.
>
>
> (1)
> I plugged in and started measuring the 3 voltages and thermistor
> resistance value.
> After about 2 hours later all 3 voltages were stabilized and thermistor
> value stabilized after 24 hours.
>
> All voltages and thermistor values were measured on a HP 3457 which was
> calibrated and certified by a local cal lab 10 months ago. Here is how I
> measure: After changing the connection to a different voltage I wait 30
> second. I start STAT and wait 1 minute and R MEAN.
>
> 10V      (10.000360 36.0ppm, 360uV)
> 1V        (1.0000383 38.3ppm, 38.3uV)
> 1.018V  (1.0180200 20ppm, 20uV)
>
> According to the manual adjustable(calibration) ranges are:
> 10V     5ppm 50uV
> 1V       5ppm 5uV
> 1.018   50ppm 50uV
>
> So obviously either 732A or 3457A is wrong.
> I tried to contact the person who calibrated the HP 3457A. No response.
>
> (2)
> No light on BTRY CHG and IN CAL
> Rear panel Battery Operation switch is on.
>
> (3)
> Front panel calibration hole
> I put a thin flat blade driver into the holes. I couldn't feel anything
> until 4 1/4" inside where I felt something but not the potentiometer.
>
>
>
> I offered to the seller that if I find the 732A is no problem but only
> requires the new battery, refunding $150 for the battery will close the
> deal. All other case, I return the item.
>
> He responded "Just return it."
>
> My questions:
> (1) Which one is wrong the DMM or 732A?
> (2) What is the cheapest battery replacement cost?
> (3) Were the calibration mechanism removed or they are there? In manual I
> couldn't find any detailed description or diagram of it.
>
> Last, I paid $650 plus $35 shipping. Do you think it is worth without
> battery, if voltages are in the range?
>
> Michael
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