--- In TekScopes@...,
"cheater00 ." wrote:
> Hi guys,
> De-lurking as I've been doing some measurement
equipment related shopping :)
> I'm slowly building up my workbench, and was
wondering if anyone could
> suggest what gear to get.
> After getting a Tek 7704 I now need a good sinewave
generator for some
> work. I thought to myself, why buy just a sinewave
generator, when I
> could get a distortion meter? Those have sinewave and
square built in,
> are of variable frequency, and it's better to have
one large box than
> two large boxes.
> Could someone suggest a good distortion analyzer that
can be had
> relatively inexpensively? I'm probably looking at
vintage equipment at
> this point because it can be had fairly cheaply.
Something around 100
> Euro would be a good start, but it's only a very
> price range.. maybe those things can be had for much
less -- or only
> for much more? Note - doesn't necessarily have to be
> although I'll be perfectly happy if it is.
> Also: are distortion analyzers always limited to 20
Hz - 20 kHz, or
> are there not-too-unusual ones that go below 1Hz and
> What is the 'workhorse' distortion analyzer? Is there
one or a few
> that were very good and very popular? It's important
to me not to buy
> something relatively unknown, so that when it breaks
I can find
> replacements, schematics, and people who know how to
> What other tools - other than a distortion analyzer -
could I see
> myself using when building filters, mixers,
amplifiers, etc? In the
> future I'd also like to work a bit on tube circuits,
but this is not
> currently a major focus.
> My plan is to get a distortion analyser (with
integrated square and
> sine wave oscillators), and I already have a
frequency counter for the
> Tek 7000 coming in. I'd probably get a curve tracer
at some point too,
> and maybe a precision current and voltage source or
> amplifier. Still need an esr/LC meter, I saw some
boxes online. To
> round this off I'd probably get an isolation
transformer and possibly
> variac (or both in one box). Currently not planning
for a tube tester
> or for anything that can measure transformers. Am I
> as far as the most basic measurement equipment goes?
I've not heard of a distortion analyzer that contains a
square wave generator, however, the HP 339A will certainly
handle the oscillator and distortion analysis criteria.
The frequency range is 10Hz to 110Hz for both functions.
The HP 334A has a wider frequency range (5Hz to 600KHz,
and also has an AM detector to allow distortion analysis
on AM signals), but contains no oscillator output.
Both are frequently available on eBay.
You might investigate the Tektronix TM500 series of
modular equipment. The series contains oscillators,
function generators, scopes, counters, pulse generators,
etc. The modules plug into a mainframe/power supply. This
flexibility means that you can build an instrument
containing all the instruments that you need for frequency
response, distortion, etc., into a single package. If your
aim is for scope repair and calibration, you can assemble
all the needed equipment into a single package,
interchanging the modules as you wish.
Most are on eBay frequently. These modules are somewhat
more costly than conventionally packaged bench test
equipment, but their small size and interchangeability are
All that said, the equipemnt that you should target is
highly dependent on the type of equipment that you will be
servicing. Give us an example of the types and quality of
the equipment to be serviced and we can offer more