Electrical Engineering - Vintage HP Current Amplifier, Model 1111A

Author

Vintage HP Current Amplifier, Model 1111A

Engineer

2007-04-19, 8:25 pm

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 (P.Eng, EE, Canada)
PS. I'd appreciate an email to "analogdino 'at' rogers 'dot' com" as I
don't get back here often! Many thanks.

Salmon Egg

2007-04-19, 8:25 pm

On 4/19/07 3:25 PM, in article
1177021553.215144.99550@p77g2000hsh.googlegroups.com, "Engineer"
<analogdino@rogers.com> wrote:

> 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 (P.Eng, EE, Canada)
> PS. I'd appreciate an email to "analogdino 'at' rogers 'dot' com" as I
> don't get back here often! Many thanks.
>
There are places wher you can download or buy manuals. Google. HP might even
have a site itself.

Bill
-- Fermez le Bush--about two years to go.

TimPerry

2007-04-19, 9:25 pm

Salmon Egg wrote:
> On 4/19/07 3:25 PM, in article
> 1177021553.215144.99550@p77g2000hsh.googlegroups.com, "Engineer"
> <analogdino@rogers.com> wrote:
>
> There are places wher you can download or buy manuals. Google. HP
> might even have a site itself.
>
> Bill

the test instrument division, now called Agilent, has a great many manuals.
Unfortunately not this one. they call it a "probe amplifier" www.agilent.com

you might give these folks a call http://www.fairradio.com/ . i seem to
recall seeing quite a library of manuals last time i was there.

Engineer

2007-04-21, 1:25 pm

On Apr 19, 9:33 pm, "TimPerry" <timpe...@noaspama.net> wrote:
> Salmon Egg wrote:
>
>
>
>
> the test instrument division, now called Agilent, has a great many manuals.
> Unfortunately not this one. they call it a "probe amplifier"www.agilent.com
>
> you might give these folks a callhttp://www.fairradio.com/. i seem to
> recall seeing quite a library of manuals last time i was there.- Hide quoted text -
>
> - Show quoted text -

Thanks, Bill, but did not find it. I got some specs from Dave that
look interesting (higher bandwidth than I expected) so will set up
some tests.
Cheers,
Roger

Engineer

2007-04-29, 5:25 pm

On Apr 21, 2:22 pm, Engineer <analogd...@rogers.com> wrote:
> On Apr 19, 9:33 pm, "TimPerry" <timpe...@noaspama.net> wrote:
>
>
>
>
>
>
>
>
>
>
>
>
> Thanks, Bill, but did not find it. I got some specs from Dave that
> look interesting (higher bandwidth than I expected) so will set up
> some tests.
> Cheers,
> Roger- Hide quoted text -
>
> - Show quoted text -

I got this kind email from a David G.

"The 1111A model number is just for the amplifier.
The usual 1110A probe has a specified bandwidth of 850Hz-45MHz, so the
amp is good up to at least 45MHz.
It sounds like you have a different probe though."

I replied:
"David, many thanks. My probe is, indeed, a model 1110A marked "1110A
AC current probe 1 mV/mA". I'm surprised I got any 60 Hz signal at
all out of it (I clamped it around a single lamp cord), but the low
end of 850 Hz does explain why it seeemd to read very low - I thought
my scope was out of calibration.
I'll retest it using a sig. gen, audio amplifier and a 4 ohm speaker
load, measuring the current up to 15 KHz or so (and comparing to 60
Hz, too!)
Cheers,
Roger"

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