Fluke 80i-1010 - Page 6

Figure 5. Conductor Positions
4. Use the following procedure to make the preliminary GAIN adjust-
ment:
a. Set the voltmeter function and range to accommodate a display
of 100 mV ac.
b. Verifythatthe voltmeter is ac coupled by changing the thumbwheel
ZERO control and observing that the reading returns to the
previous value after a brief settling period.
c. Clamp and center the probe around the 10-turn coil and adjust
R7 (GAIN) to obtain a voltmeter reading of 100 mV +5 mV. This
completes the preliminary GAIN adjustment procedure.
5. Use the following procedure to make the BALANCE adjustment:
a. Move the probe to position the butterfly conductor alternately
back and forth between the two opposite corners of the jaw
opening as shown in Figure 5. Observe the voltmeter reading
and adjust R105 (BALANCE) to equalize the readings (within
+0.5 mV) at the two different positions.
b. Slowly open the jaws and remove the probe from the coil.
c. Set the amplifier to standby.
d. Snap the probe jaws twice as described in step c, substeps 1, 2,
and 3 of the demagnetization procedure. This completes the
BALANCE adjustment procedure.
6. Use the following procedure to make the final COARSE ZERO
adjustment: |
a. Setthe voltmeter function and range to accommodate a display |
of 10 mV dc.
b. Turnthe thumbwheel ZERO control (R101) to one extreme of the
adjustment range and note the reading. Thenturn the thumbwheel
ZERO control (R101) to the other extreme and note the reading.
c. Using the insulated screwdriver, adjust R2 (COARSE ZERO) so
that the adjustment range of the thumbwheel ZERO gives
readings that are equally balanced around 0 mV. (For example,
the nominal range of output readings between the two extremes
is -9 mV to +9 mV.) This completes the final COARSE ZERO
adjustment procedure.