12
Scale Selection
Readings are taken on the scale having the appropri-
ate significant figures (both 3 and 300 volts are read
on the 0-300 scale) by multiplying or dividing by a
factor of 10 or 100 as indicated by the range/scale
ratio (i.e., on the 3 volt range, divide the scale read-
ings by 100). See Operation Chart on page 25.
Polarity Selection (Model 310-C only)
The Polarity Reversing Switch allows the user to elec-
trically reverse the test lead connections. That is, when
the user mistakenly connects the test leads to a cir-
cuit and obtains a “downscale” reading, the Polarity
Reversing Switch may be operated to obtain an “up-
scale” reading.
Changing Settings
The test probes should be disconnected from the volt-
age source (or the source shut off) before the Range
Switch or Polarity Reversing Switch (310-C only) po-
sition is changed. This practice will result in an in-
creased life and reliability for the tester, as well as es-
tablishing a good safety practice.
Zero Adjustment
The Meter Zero Adjust Screw is located near the cen-
ter of the tester. It should be periodically adjusted so
the meter pointer is on zero with no input into the
tester.
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