5502A
Operators Manual
10-20
5. Do the procedure again if necessary. For example, if you did a fast sweep, it can be
necessary to pinpoint a special frequency with a slow sweep over a subset of your
previous frequency range.
Frequency Response Calibration Procedure for an Oscilloscope
This sample procedure, which verifies the frequency response on your oscilloscope, is
usually done after the pulse response is verified.
To verify the bandwidth, this procedure finds 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 run the oscilloscope option in
Levsine mode. If you are, the Control Display shows the subsequent menu, see below.
gl032i.eps
Do the subsequent sample procedure to calibrate the frequency response.
1. Push the key on the 5502A to reconnect the signal. 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 to the calibration
recommendations in your oscilloscope manual. For example, for the Fluke PM3392A
oscilloscope, start at 120 mV @ 50 kHz. To key in 120 mV, push
, and then push .
3. Adjust the oscilloscope as necessary. The sine wave must show at six divisions, p-p,
as shown below.
If necessary, make small adjustments to the voltage amplitude until the wave gets to
exactly six divisions. To fine-tune the voltage, push to move a cursor into the
Output Display, move the cursor with the key, and turn the rotary knob to
adjust the value. (See “Fine-Tuning Values” earlier in this chapter.)
gl009i.bmp
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