Table of Contents
Advertisement
Perform the following sample procedure to calibrate the frequency response.
1. Reconnect the signal by pressing the key on the 5080A. 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 Fluke PM3392A
oscilloscope, start at 120 mV @ 50 kHz. To enter 120 mV, press
; then press .
3. Adjust the oscilloscope as necessary. The sine wave should appear at exactly six
divisions, p-p, 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 to bring 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.)
4. Increase the frequency to 60 MHz (for 100 MHz instruments), or 150 MHz (for
200 MHz instruments). To enter 60 MHz, press ; then press .
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
to place a cursor in the Output Display. Press again to place it in the
frequency field, and use the and 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.
riešenia na presné meranie
Calibrating the Pulse and Frequency Response on an Oscilloscope
http://www.elso.sk
Scope Calibration Option
gl032i.eps
gl009i.bmp
15
Advertisement
Table of Contents
