Scope Calibration Option
Calibrating the Pulse and Frequency Response on an Oscilloscope
9
Volt mode. If you are, the Control Display shows the following menu.
gjm015.eps
Perform the following sample procedure to calibrate the vertical gain.
1.
Connect the calibrator to Channel 1 on the oscilloscope, making sure the oscilloscope
is terminated at the proper impedance (1 M
Ω
for this example). Verify that the
key on the 5080A is lit, indicating that the signal is connected.
2.
Key in the voltage level that is recommended for your oscilloscope. For example to
enter 30 mV, press
then press
. See “Keying in a Value”
earlier in this chapter.
3.
Adjust the oscilloscope as necessary. The waveform should be similar to the one
shown below, with the gain at exactly the amount specified for the calibration
settings for your oscilloscope.
This example shows the gain at 30 mV to be 6 divisions, at 5 mV per division.
gl006i.bmp
4.
Change the voltage to the next value recommended for calibrating your oscilloscope
model, and repeat this procedure at the new voltage level, verifying the gain is
correct according to the specifications in your manual.
5.
Repeat the procedure for each channel.
Calibrating the Pulse and Frequency Response on an
Oscilloscope
The pulse response is calibrated with a square-wave signal that has a fast leading edge
rise-time. Using this signal, you adjust the oscilloscope as necessary until it meets its
particular specifications for rise time and pulse aberrations.
Following pulse verification, the frequency response is checked by applying a leveled
sine wave and acquiring a frequency reading at the -3 dB point, when the amplitude drops
approximately 30 %.
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