Ballantine 3207, Instruction Manual

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BALLANTINE LABORATORIES, Inc. MODEL 3207 MICRO-OHM METER
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3.4 Using test leads:
Use Appropriate test leads for specific application (see Section 1.5).
3.5 Zeroing The Instrument
Ensure that the instrument is warmed up for five minutes.
Ensure that correct range required for the measurement is selected through switches (e.g.
2m
Ω
TO 2000
Ω
)
Ensure that PULSE / CONT mode is off
Select OPERATE mode. Connect DUT. Disconnect the I+ terminal.
If display is not 0000, adjust the reading to Zero using a screwdriver through the hole
provided on the front panel.
Reconnect the I+ terminal.
Caution
Use the special Screwdriver provided with the instrument for zeroing, otherwise it may
damage the adjustment and void the warranty.
3.6 Pulse Mode Operation
NOTE: -
The Trigger switch shall be operated momentarily.
In this mode, current through the resistor is supplied only for a short duration whenever the
trigger switch is pressed, and the reading is stored until the next measurement cycle is
initiated. This results in minimum heating of the resistance under test. PULSE mode
operation permits accurate measurement of resistance, which are temperature dependent.
It is useful for non-destructive measurement of fuse links, riveted joints, welds, solder joints,
relay and switch contacts, etc.
Caution
Pulse mode operation must be used only for non-inductive resistors. Under no
circumstances should it be used to measure inductive resistances, otherwise you may
obtain erroneous readings and/or damage the instrument.