Re: HP 334a - and how to use it

"apa" <tacoma57@xxxxxxxxxxx> wrote in message
news:1133474264.512335.118920@xxxxxxxxxxxxxxxxxxxxxxxxxxxx

> I have an HP 334a sitting around that I've just been
> using as a extra votmeter. I'd like to use it as it's
> namesake implies but I don't have a manual or any real
> clue how to use in the distortion analyzer mode. Can
> anyone give a quick puch list for the procedure?

Ite's been about 3 decades since I used a 333/334 but...

Set up the UUT to produce a sine wave at some frequency, say
1 KHz.

For your initial testing, use the best sine wave generator
that you can find, or use a CD player playing a test CD with
sine waves on it.

These days you can easily generate the sine wave files for
your own test disc with shareware/freeware like Goldwave and
then burn your own disc with your CD burner. A good CD
player should be flat 50-15 Khz within 0.2 dB or better
with THD under 0.02%. Full scale output of a consumer
player should be something in the range of +6 to +10 dB.

IOW, a CD player + a teast disc can be a pretty good test
signal generator, especially if you have an analog
attenuator to adjust its output. A good qulaity 5K pot can
do the job.

Apply the test signal and adjust the gain of the UUT to
produce an output signal at some desired level such as +4
Vu.

On the 334 there's a set level mode where you set 100%
distortion by adjusting its input sensitivity. Make sure the
automatic nulling is turned off.

There is a nulling mode where you null out the the 1KHz sine
wave, leaving the distortion which you measure.

Start in the 100% range and null out the distortion. Work
down the ranges until you have a minimal reading that is
close to 1/4 and full scale. My recollection is that the
ranges are 10 dB apart, so you just step down until you get
a reading between 30% and 100% of full scale.

The 334 is auto-nulling so once you get close to best null,
it goes the rest of the way by itself.


.

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