Monroe Electronics NanoCoulomb Meter - model 284 - Manual (Page 5)

Page 3 284.CBSM-12/98-RCA
Section 3
OPERATION
The Monroe Electronics Model 284 Nanocoulomb Meter has been designed for
extreme ease of operation.
1. Connect Faraday cup to Model 284.
2. Switch power on.
3. Set to least sensitive range (decimal point furthest to the right for your
instrument).
4. Zero the instrument.
5. Place charged object in cup and take reading.
The Faraday cup comes with a cover, which can be used when zeroing or when
taking readings in areas where one suspects that outside electric fields may be
affecting readings.
One can measure both “mobile” and “immobile” charge in objects to be tested.
To do this, follow the above procedure. After step 5, note the reading (this
reading is the “total” charge reading). Then remove the object being tested by
dumping it out of the cup or by lifting it out with a set of wooden tongs. The
reading that is now being displayed in the meter is the “mobile” charge on the
object being tested.
Since “total” charge = “mobile” charge + “immobile” charge, we can calculate the
“immobile” charge by subtracting the “mobile” charge from the “total” charge.