MM0474
(d) Meter linearity
1.
The test instrument range switch should be set to position 3.
2. With the power meter calibrator power switch in position 1,
the test instrument will indicate 1 milliwatt.
3. With the power meter calibrator power switch in position 2,
the test instrument will indicate 2 milliwatts.
4. With the power meter calibrator power switch in position 3,
the test instrument will indicate 3 milliwatts.
(e) Zero carryover
1. For this test the thermistor mount should be connected to the
test instrument while deenergized.
2. After a 15 minute warm up period, set the test instrument
range switch to course zero and adjust for a zero indication on the test
instrument meter.
3. With the test instrument range switch in position .01, press
the test instrument fine zero switch, the test instrument meter should indicate
zero.
4. The meter should remain on zero as the range switch is
rotated through each position.
5. For this test an oscilloscope can also be used instead of the
test instrument meter. It should be connected to the recorder output through a
filtering network as shown in Figure 5.
b. Without a power meter calibrator
(1) Meter accuracy test
(a) The test instrument controls should be set to the following
positions.
1.
Range switch to coarse zero.
2.
Mount resistance switch to 200.
3.
Calibration Factor switch to 100%.
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