Fluke 522A/6, Operator'S Manual

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5522A
Operators Manual
10-20
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4. Increase the frequency to 400 MHz (for 400-MHz instruments), or 500 MHz (for
500-MHz instruments). To enter 400 MHz, press
4 0 0 M H
; then
press
E
.
5. Continue to increase the frequency slowly until the waveform decreases to 4.2
divisions, as shown below.
To increase the frequency slowly, fine-tune it using the rotary knob. To do this, press
e
to place a cursor in the Output Display. Press
e
again to place it in the
frequency field, and use the
L
and
W
keys to move it to the digit you want to
change. Then change the value by turning the rotary knob. Continue making small
increments in the frequency until the signal drops to 4.2 divisions. At 4.2 divisions,
the signal is at the frequency that corresponds to the -3 dB point.
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6. Remove the input signal by pressing
Y
.
7. Repeat this procedure for the remaining channels on your oscilloscope.
How to Calibrate the Time Base of an Oscilloscope
The horizontal deflection (time base) of an oscilloscope is calibrated using a method
similar to the vertical gain calibration. A time marker signal is generated from the
Calibrator and the signal’s peaks are matched to the graticule line divisions on the
oscilloscope.