All,
For any who may be interested, the same guy I bought the LCR meter off of has
several ESI 230B guarded resistance bridges for sale at a good price. These are
easily converted to a very accurate resistance standard which would sell for
several hundred dollars. ESI actually makes one similar. One leg of the bridge
contains all the precision resistors you need. What you do is put them in
series with a DMM or Analog meter you want to test to set a meter. Not very
much re-wiring is needed. He provides a good blown up schematic of the bridge
on the auction page. There is also an internal DecaStat which is a precision 5
step potentiometer in another leg which you want to use in series with the
fixed resistors, or you can use it by itself. This bridge/standard comes in
handy for making precision resistors to use in metering circuits in amps. You
can compare the resistors your going to use with the standard, or set a pot to
a precision resistance to feed the meters. You can also use t
his without the modification as it but you need the rest of the equipment it
goes with that has the voltage source and the meter. I bought one of these
myself to do the conversion on and have a precision resistance standard.
Specs:
Resistance Range: 11 ranges, 1.2 Ogm to 12 GigaOhm full scale
Resolutions: Better than 1ppm of full scale on any range (1 microOgm per dial
division on lowest range)
Accuracy: +/- 0.01% of reading or +/- 1 dial division, whichever is greater,
when connected for short-circuit resistance.
Power Input: 1 Watt continuous, max.
http://cgi.ebay.com/ESI-230B-Guarded-Resistance-Bridge-1-Ohm-12-Giga-Ohm_W0QQitemZ7609246436QQcategoryZ25399QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Item number: 7609246436
Best,
Will
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