5500A-SC600 Option
Calibrating the Pulse and Frequency Response on an Oscilloscope
8
8-25
Before you start this example procedure, verify that you are running the SC600 Option in
LEVSINE mode. If you are, the Control Display shows the following menu.
Output @ SCOPE
terminal (50Ω)
MORE
OPTIONS
SET TO
LAST F
MODE
levsine
fffff
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 g 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
chapter.)
gl009i.eps
4. Increase the frequency to 400 MHz (for 500-MHz instruments), or 500 MHz (for
600-MHz instruments). To enter 400 MHz, press 400MH; 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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