5502A
Operators Manual
9-20
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. Refer to the calibration
recommendations in your oscilloscope manual. For example, for the HP 54522C
oscilloscope, start at 600 mV @ 1 MHz. To record 600 mV, push
; then push .
3. Adjust the oscilloscope as necessary. The sine wave must show at six divisions,
peak-to-peak, as shown below.
If necessary, make small adjustments to the voltage amplitude until the wave gets to
six divisions. To fine-tune the voltage, push to bring a cursor into the Output
Display, move the cursor with the key, and turn the rotary knob to adjust the
value.
gl009i.bmp
4. Increase the frequency to 400 MHz (for 500 MHz instruments), or 500 MHz (for
600 MHz instruments). To record 400 MHz, push then
push .
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 with the rotary knob. To do this, push
to place a cursor in the Output Display, push again to place it in the
frequency field, and use the and keys to move it to the digit you want to
change. Then turn the rotary knob to change the value. Continue with small
increments in the frequency until the signal drops to 4.2 divisions. At 4.2 divisions,
the signal is at the frequency that agrees to the -3 dB point, see below.
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