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" <[email protected]>
To: <[email protected]>
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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