Fluke 80i-1010 - Operation

4. Observe the voltmeter reading. If the reading falls between -100.0
and -170.0 mV, the probe is ready for use. (Newbatteries should read
approximately -150 mV.)
5. If the reading falls between 0.0 and -99.9 mV, both batteries should
be replaced. If the voltmeter reading is positive, either the test leads
are reversed or the batteries are installed incorrectly.
NOTE
The probe's internal circuit operation causes the two batter-
les to discharge at different rates. Therefore, it is essential
that both batteries be replaced simultaneously when the
battery test voltage falls below the lower operating limit.
y
-100.0mV
-170.0mV
-99.9mV
Figure 1. Battery Test
OPERATION
DC ZERO Adjustment
NOTE
The DC ZERO Adjustment procedure is required when
measuring de or ac + de currents in conjunction with a
voltmeter function that is de coupled. The DC ZERO Adjust-
ment procedure is not required when measuring ac current
only with a voltmeter function that is ac coupled.
1. Connect the probe output leads to the voltmeter inputs: black to
COMMON or LOW, and red to VOLTS.
2. Set the voltmeter function to de millivolts (de mV===), and turn the
voltmeter power on. Select a range capable of displaying 10 mV de
or more.
3. Turntheprobe ON/OFF switch located onthe probe handle tothe ON
position.
4. Observe the voltmeter display and adjust the thumbwheel ZERO
control for a reading as close as possible to 0.0 mV (see Figure 2).
NOTE
When making low level measurements below 5A, improved
accuracy can be achieved by performing the DC ZERO
Adjustment procedure before each measurement. It is also
advisable to check the ZERO adjustment if the current being
measured has undergone a bed change i.e., from 100A to
1A or if the measured current has changed polarity.
Figure 2. DC ZERO Adjustment