Fluke 522A/6, Operator'S Manual

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SC1100 Oscilloscope Calibration Option
How to Calibrate the Pulse and Frequency Response on an Oscilloscope
10
10-19
Note
When you interrupt the frequency sweep by pressing HALT SWEEP, the
FREQ CHANGE method switches back to “jump.”
5. Repeat the procedure if necessary. For example, if you did a fast sweep, you may
want to pinpoint a certain frequency with a slow sweep over a subset of your
previous frequency range.
Oscilloscope Frequency Response Calibration Procedure
This sample procedure, which verifies the frequency response on your oscilloscope, is
usually performed after the pulse response is verified.
This procedure checks the bandwidth by finding the frequency at the -3 dB point for your
oscilloscope. The reference sine wave in this procedure has an amplitude of 6 divisions,
so that the -3 dB point can be found when the amplitude drops to 4.2 divisions.
Before you start this example procedure, verify that you are running the SC1100 Option
in LEVSINE mode. If you are, the Control Display shows the following menu.
gjh058.eps
Perform the following sample procedure to calibrate the frequency response:
1.
Reconnect the signal by pressing the
O
key on the Calibrator. Select 50
Ω
impedance or use a 50
Ω
external termination directly at the oscilloscope input.
2. Adjust the sine wave settings in the Output Display according to the calibration
recommendations in your oscilloscope manual. For example, for the HP 54522C
oscilloscope, start at 600 mV @ 1 MHz. To enter 600 mV, press
6 0 0 c V
; then press
E
.
3. Adjust the oscilloscope as necessary. The sine wave should appear at exactly six
divisions, peak-to-peak, as shown below.
If necessary, make small adjustments to the voltage amplitude until the wave reaches
exactly six divisions. To fine-tune the voltage, press
e
to bring a cursor into the
Output Display, move the cursor with the
L
key, and turn the rotary knob to
adjust the value. (See “Adjusting Values with the Rotary Knob” earlier in this
manual.)