Re: [time-nuts] adjustable gain/offset amplifiers
I have been considering making a tray for one or two 7A13 Differential Amplifier plug-ins from the Tek 7k series. The 7A13 has differential output, so aside from a few supply voltages, I need a wideband diff amp and voila. This could drive a conventional (read: limited dynamic range) DSO or anything else as needed. I have two such plug-ins and a donnor 7603 mainframe for the chassis, just need some time and more motivation or need than I can muster at the moment... Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Lux, James P (337C) Sent: Friday, July 24, 2009 1:04 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] adjustable gain/offset amplifiers 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 +1(818)354-2075 phone +1(818)393-6875 fax ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] adjustable gain/offset amplifiers
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 +1(818)354-2075 phone +1(818)393-6875 fax ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
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 +1(818)354-2075 phone +1(818)393-6875 fax ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
I have an EGG (Now signal recovery) 5185 wideband preamp that would suit. see http://www.signalrecovery.com/5185page.htm This is not a solitation to sell mine:-) They do a range of other models. Robert G8RPI. --- On Fri, 24/7/09, Lux, James P (337C) james.p@jpl.nasa.gov wrote: From: Lux, James P (337C) james.p@jpl.nasa.gov Subject: [time-nuts] adjustable gain/offset amplifiers To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 July, 2009, 7:03 PM 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 +1(818)354-2075 phone +1(818)393-6875 fax ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Friday, July 24, 2009 11:35 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] adjustable gain/offset amplifiers 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. the venerable (and discontinued) AM502 that plugged into the TM500 series racks. And what I was actually thinking when I set out on this quest, having used them in the 70s. Turns out that they only have 1 MHz BW (the SRS SIM983 is essentially an improved AM502, functionally, and works the same.. shared power supply cage, etc.) 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. oetech.com is the guy. This is for work, so we can buy/rent new, if it exists. I'll check Berkeley Nucleonics and Canberra.. good hint. 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. that's what I noticed. 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. that's the fallback.. but I wanted to just buy a box with nice knobs, a power supply, etc., rather than engage in a development project. Already got too many little unlabeled boxes with trimpots, some opamps, and unlabeled power connectors.. If someone sold a few thousand dollar box that does this, then I don't have to rummage through the cabinets, reverse engineer the design, etc. Thanks Jim 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. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Atkinson Sent: Friday, July 24, 2009 12:55 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] adjustable gain/offset amplifiers I have an EGG (Now signal recovery) 5185 wideband preamp that would suit. see http://www.signalrecovery.com/5185page.htm This is not a solitation to sell mine:-) They do a range of other models. Robert G8RPI. Thanks.. getting closer to what I need.. It has the gain and BW, but not the adjustable offset. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
Hi, Have another look at the spec, it has adjustable offset via a multi turn trimmer accessed through a hole in the front panel. I just saw your comment on cost, for $1000 dollars you can have mine, I'll even fit a ten-turn pit and dial for the offset if you wish. You can download the manual from the website. Regards, Robert. --- On Fri, 24/7/09, Lux, James P (337C) james.p@jpl.nasa.gov wrote: From: Lux, James P (337C) james.p@jpl.nasa.gov Subject: Re: [time-nuts] adjustable gain/offset amplifiers To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, 24 July, 2009, 9:03 PM -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Atkinson Sent: Friday, July 24, 2009 12:55 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] adjustable gain/offset amplifiers I have an EGG (Now signal recovery) 5185 wideband preamp that would suit. see http://www.signalrecovery.com/5185page.htm This is not a solitation to sell mine:-) They do a range of other models. Robert G8RPI. Thanks.. getting closer to what I need.. It has the gain and BW, but not the adjustable offset. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
Lux, James P (337C) wrote: -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Atkinson Sent: Friday, July 24, 2009 12:55 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] adjustable gain/offset amplifiers I have an EGG (Now signal recovery) 5185 wideband preamp that would suit. see http://www.signalrecovery.com/5185page.htm This is not a solitation to sell mine:-) They do a range of other models. Robert G8RPI. Thanks.. getting closer to what I need.. It has the gain and BW, but not the adjustable offset. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. Jim The AD830 differential input amplifier has a reasonably high bandwidth (85MHz at unity gain) and can easily be configured for an input dc offset of in the (-5V to +5V) range as its input common mode range is (-12, +12.8). However it only has a linear input range of about 2V and the input noise is around 30nV/rtHz. Gain is set by a pair of resistors. Bruce ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] adjustable gain/offset amplifiers
Hi Jim, Take a look at the LeCroy DA1855A... I think that might be just what you need. 100MHz BW, precision offset generator, gain settings up to 10x (or is it 100x? ... been a while since I've used one). You'll need 1x probes to get the max gain though. - Chad. On Fri, Jul 24, 2009 at 11:03 AM, Lux, James P (337C) james.p@jpl.nasa.gov wrote: 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 +1(818)354-2075 phone +1(818)393-6875 fax ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
