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2312G INSTRUCTION MANUAL
56-101-00550-D CH. 3
11/7/14 Page 13 / 20
2) Press the “CAL.” Pushbutton. Adjust the “CAL. ADJUST” control for full scale
“0” on the panel meter’s “INS.” scale.
NOTE: If deflection is not as specified, replace the 45-volt battery as outlined
above.
(b) To check the 1.5-volt battery used for all functions other than insulation:
1) Rotate the “FUNCTION” selector switch to the “RX1”, “RX10” or “IND.”
position.
2) Press the “CAL.” pushbutton switch. Adjust the “CAL. ADJUST” control for full-
scale infinity mark on the panel meter’s “RX1 / RX10” scale.
NOTE: If deflection is not as specified, replace the 1.5-volt battery as
outlined above.
NOTE: Approximate battery condition may be checked by rotating the “CAL.
ADJUST” fully counterclockwise. Set “FUNCTION” selector to “RX1”
for 1.5-volt battery, and to “INS.” for 45-volt battery test. Depress the
“CAL.” pushbutton, insure pointer deflection is beyond “BAT. OK” line
.
(5) Insert test lead plug fully into receptacle (Refer to 1-1, Figure 1, 1) at the top of
the2312G before attempting to operate the 2312G.
NOTE: For ALL battery checks, the test cable plug must be inserted and test lead clips
disconnected
.
(6) Adjust meter pointer with meter bezel knob to low end of scale zero (“0”) before
resistance or insulation tests. Adjust to ambient for indicator tests. (An accurate
thermometer placed next to the indicator under test is recommended.)
NOTE: More positive pointer action is achieved when bezel knob is positioned so
that clockwise knob movement moves pointer downscale. If action is reversed,
rotate knob 180 degrees.
(7) To remove inherent friction, gently tap 2312G meter bezel after each adjustment and
before reading. Also tap system indicator before reading unless specifically instructed
otherwise by manufacturer’s instructions.
C. Hot Engine Testing
A hot engine will cause thermocouples to generate a small potential, which will
produce errors in measured resistance values
. This effect is inherent in any type of
resistance measuring instrument. It is more troublesome in ohmmeters than in Wheatstone
Bridge circuits, so it will be more noticeable on the “RX1” and RX10” functions than on the
“LEAD” function.