Looking for specs for a vintage HP Current Amplifier Model 1111A

Apr 19, 2007 3 Replies
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Hi, everyone. Can anyone point me in the direction of the specifications for Subject instrument. I've just refurbished one that I rescued from the dumpster, but I'm not sure over what frequency range it works - checks out good at 60 Hz, but what about audio frequencies? BTW, it consists of three pieces:



  1. a magnetic split-toroidal probe, plus coax cable,
  2. an electronics unit that drives a scope on the 50 mV/cm setting, and
  3. an old fashioned "wall-wart" p/s (before that term was in vogue!) - all built like a brick outhouse, typical of HP from that era. Cheers, Roger PS. I'd appreciate an email to "analogdino 'at' rogers 'dot' com" as I don't get back here often! Many thanks.

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D

Nope, I ain't gonna reply to your email. You asked the question here, and you should at least have the courtesy to look for your answer here.

OK, rant over. The 1111A has a rise time of 18ns. Accuracy in X10 mode is +-3%, in X100 mode is +-4%. Max AC current above 700 Hz is 50A p-p. Below 700 Hz, the max current is decreased by 1.4A/20Hz. Output impedance is 50 ohms. Noise is

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Well, that's a relief... I only came back to see if my post went in! Just think what I would have missed...

the

goes.- Hide quoted text -

Dave, thanks for the info - now copied into my specs file. I'll run a test using an audio power amplifier into a 4 ohm load up to a few KHz and see what I get. Oh, and I'm glad you did not email me... I would not like accepting such an extravagant accommodation that I could never repay. Cheers (still), Roger

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D

Good luck with your testing. You could repay by posting the results of your testing back here, so that if anyone else might be going through the same pains as you are would have the benefits of your work.

Cheers!!!

Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer to the end, the faster it goes.
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