Analog Meters for sale - RF Cafe Forums
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Post subject: Analog Meters for sale
Posted: Tue Aug 21, 2007 10:09 am
Joined: Mon Apr 10, 2006
I have the following analog meters
for sale. These meters have been in storage for
the past couple of years. When they were removed
from service they were all working.
Wattmeter Model 432 Quantity of 1 $25.00
Model 264 0 to +/- 50 mA Quantity of 3 $20.00
Weston Model 264 0 to +/- 100 mA Quantity of
Weston 0 to 150 V AC Quantity of
Weston 0 to +/- 30 uA Quantity of 1
Weston 310 0 to 10V Quantity of 1
Western Electric 0 to 1 mA Quantity
of 1 $5.00
Knight 0 to 1 mA Quantity of
Knight 0 to 5 A Quantity of 3 $5.00
Simpson 0 to 50 uA Quantity of 1 $5.00
Simpson 0 to 1 mA Quantity of 6 $5.00
0 to 20 mA Quantity of 1 $5.00
Simpson 0 to
100 mA Quantity of 2 $5.00
Simpson 0 to 150
mA Quantity of 2 $5.00
Simpson 0 to 3 A Quantity
of 3 (this meter is marked AC) $5.00
0 to 5 A Quantity of 3 $5.00
Simpson 0 to 10
A Quantity of 1 $5.00
Triplet 420-G 0 to
1 mA Quantity of 3 $5.00
Triplet 420-G 0 to
1 A Quantity of 1 $5.00
Triplet 420-G 0 to 500
mA Quantity of 5 $5.00
Instrument 15V Quantity of 1 $5.00
is interested I can send a digital picture of the
meter. Buyer will pay for shipping.
Post subject: Meters
Posted: Wed Aug 22, 2007 10:03 am
Joined: Tue Dec 26, 2006
"private messaging is disabled on this board" so
I cannot 'pm' you.
send an email to
a l a
s.c o m
There is one on that list I definitely
(email address posted in a manner
that makes it tough for the spambots to read it.)
I have a 'broken' HP 425A that reads down
to +/-10 pA DC full scale.
The HV filter cap
went and killed the supply. Sure wish I had a schematic
Back whenever that was made they
called it micromicroamperes. The smallest division
on the meter is 0.2 pA To read this small of a current
it uses a chopper amp. The 'chopper amplifier' is
literally a small motor turning a disc with holes
in it. #12 lamps on one side and photocells on the
other. I wish they had these things in college.
When it worked I showed other engineers that if
you just grabbed a couple of 'test leads' out of
a drawer and 'shorted them' you would read several
pA at room temperature and the current would change
when I exhaled on the 'shorted' leads. Using a meter
that reads that low requires very careful choice
of conductors and connectors.
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