[time-nuts] adjustable gain/offset amplifiers

[J. Forster]

Hi Jim,

A couple of thoughts:

Tektronix made a TM500 Op-Amp module that would do what you want
functionally, but I don't know about the BW.

If you are interested, there is a NIM and CAMAC Yahoo Group. It's pretty
new. CAMAC is more likely to have such a thing than NIM, since it's a much
newer standard. You should also check other vendors, like Canberra. There
is a guy in New Mexico (?) that specializes in used modules and cages and
has a very extensive web site listing modules.

Strain gage stuff is usually very low level and is often set up for full
bridges. Wide band is not usually required as the measurements are mostly
static or low bandwidth.

You might want to look at Instrumentation Amp ICs from Analog Devices or
others. They have a gain set resistor, + and - inputs with typically hi-Z
and very, very good CMRR.

Best,
-John

===============



> I'm looking for some amplifiers with adjustable gain (say from 0 to 5) and
> offset (say +/- 5V) for general benchtop use (e.g. you have some widget
> you want to test as a replacement, but the original device had different
> input ranges, and before you go redesign the rest of the circuit..) with
> at least 10 MHz BW.
>
> SRS has something close (SIM983) but it's only 1 MHz BW..
>
> I'm thinking that someone might have run across it in the nuclear
> instrumentation or experimental physics area? (I looked through the Ortec
> NIM module listing, but nothing lept out).  I've also run across the
> instrumentation amps used for strain gages, but they're all in the few
> tens of kHz range.
>
> I'd like to avoid cobbling up something with some wideband opamps and pots
> (which is what we've done in the past..).
>
>
> James Lux, P.E.
> Task Manager, SOMD Software Defined Radios
> Flight Communications Systems Section
> Jet Propulsion Laboratory
> 4800 Oak Grove Drive, Mail Stop 161-213
> Pasadena, CA, 91109
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