Applications
DC
Voltage Measurement
Sometimes a 5% estimate of a dc voltage is good enough to verify the
operation of a power supply, trace power supply distribution, or verify the state of
a control system.
1.
Display either CH
1
or CH 2, and connect it to the voltage.
2.
Push AUTO Setup and read the voltage in the trigger level readout. For
voltages in the same range, simply touch the probe to the voltage. For best
accuracy, set VOLTS/DIV so the measured voltage is five to fifteen
divisions.
OR
1.
Push MEASURE.
2.
Select VOLTS from the menu.
The AVERAGE VOLTS readout is a good measure of the DC voltage present.
Amplitude Modulation
1.
Set VOLTS/DIV and VAR for five divisions of carrier amplitude. Carrier
amplitude is the difference between positive peaks of the modulated signal
and negative peaks of the minimum-amplitude part of the envelope.
2.
Align the reference AV cursor with the positive peaks of the minimum-
amplitude part of the envelope and the A cursor with the positive peaks of
the signal envelope.
3. The RATIO readout shows the modulation index in percent.
2465B/2455B/2445B Operators
3-3
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