[time-nuts] Analog Devices precision voltage source

Dave Brown tractorb at ihug.co.nz
Wed Jan 13 08:56:42 UTC 2010


Do you mean the 428B? (the 628A is a 20 Gig sig gen)
Exceptionally useful instruments- use mine all the time.
DaveB, NZ

----- Original Message ----- 
From: "Michael Baker" <mpb45 at clanbaker.org>
To: <time-nuts at febo.com>
Sent: Wednesday, January 13, 2010 4:03 PM
Subject: [time-nuts] Analog Devices precision voltage source


> Hello, TimeNutters--
>
> I used the Analog Devices AD588 chip
>
> > http://www.analog.com/static/imported-files/data_sheets/AD588.pdf 
> > <
>
> to build a precision current reference for an older
> model HP-628B clamp-on current meter.
>
> I used the precision 10VDC to feed a 0.1% 1K resister for
> a 10mA reference.  I brought a loop of wire in series
> with the 10K resistor out to the front panel for access
> by the probe.  The meter's full-scale meter ranges are:
> 1mA -  3mA - 10mA - 30mA - 100mA - 300mA - 1A - 10A
>
> The HP628B clamp-on current meter has been a very useful
> item on my work bench and the precision 10mA current reference
> to check the meter calibration has been very handy.
>
> Mike Baker
>
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