Z-Mod Sensitivity.............................................t- ■ - Fluke PM3082 Service Manual

PERFORMANCE TEST
6.3.39 Z-MOD sensitivity
This test checks the sensitivity of the Z modulation facility.
test equipment:
Fluke 5500A mode: wavegen, wave square (Alternative: function generator PM5136)
T-piece
test set-up:
5500A
settings/procedure and requirements:
1 - Apply a 1 kHz square-wave signal, duty cycle 50%, amplitude between 0 to +2.5V, to input
CH1. Adjust the generator to a signal of 2.5 Vpp with an offset of 1.25V.
2 - Press the AUTOSET key.
3 - Set MTB to 0.5 ms/div.
4 - Set the trace of CH1 in mid position with the CH1 POS control.
5 - Apply the same signal by means of the T-piece to the Z input (rear side).
6 - Adjust TRACE INTENSITY so that only the bottom half of the square-wave is displayed: the
top half must be just invisible (0.5 ms light on; 0.5 ms light off).
7 - Decrease the input signal to 0.5 Vpp with an offset of 0.25V.
8 - Set CH1 to 0.5 V/div.
9 - Verify that the complete square-wave is visible.
OSCILLOSCOPE UNDER TEST
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