Fig. 79 Waveform of Automation Measurement
35.2. Example 2
Gain of the Amplifier in the Metering Circuit
Set the probe menu attenuation coefficient as 10X and that of the switch in the probe as 10X (see “6. How to
the Probe Attenuation Coefficient” on page 101).
Connect the oscilloscope CH1 channel with the circuit signal input end and the CH2 channel to the output end.
Operation Steps:
1. Push down the Autoset button and the oscilloscope will automatically adjust the waveforms of the two
channels into the proper display state.
2. Push down the Measure button to show the Measure menu.
3. Press the H1 button.
4. Press the F2 button and choose CH1.
5. Press the F1 button and turn the M knob to choose PK-PK.
6. Press the F2 button and choose CH2.
7. Press the F1 button again and turn the M knob to choose PK-PK.
8. Read the peak-to-peak voltages of Channel 1 and Channel 2 from the bottom left of the screen (See Fig.
80).
9. Calculate the amplifier gain with the following formulas.
Gain = Output Signal / Input signal
Gain (db) = 20×log (gain)
-160-
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