Getting Started 1
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 27
If you see the waveform, but the square wave is not shaped correctly as
shown above, perform the procedure “Compensate Passive Probes" on
page 27.
If you do not see the waveform, make sure the probe is connected
securely to the front panel channel input BNC and to the left side,
Demo 2, Probe Comp terminal.
How AutoScale
Works
Auto Scale analyzes any waveforms present at each channel and at the
external trigger input. This includes the digital channels, if connected.
Auto Scale finds, turns on, and scales any channel with a repetitive
waveform that has a frequency of at least 25 Hz, a duty cycle greater than
0.5%, and an amplitude of at least 10 mV peak-to- peak. Any channels that
do not meet these requirements are turned off.
The trigger source is selected by looking for the first valid waveform
starting with external trigger, then continuing with the lowest number
analog channel up to the highest number analog channel, and finally (if
digital probes are connected) the highest number digital channel.
During Auto Scale, the delay is set to 0.0 seconds, the horizontal time/div
(sweep speed) setting is a function of the input signal (about 2 periods of
the triggered signal on the screen), and the triggering mode is set to Edge.
Compensate Passive Probes
Each oscilloscope passive probe must be compensated to match the input
characteristics of the oscilloscope channel to which it is connected. A
poorly compensated probe can introduce significant measurement errors.
1 Input the Probe Comp signal (see “Input a Waveform" on page 25).
2 Press [Default Setup] to recall the default oscilloscope setup (see “Recall
the Default Oscilloscope Setup" on page 25).
3 Press [Auto Scale] to automatically configure the oscilloscope for the
Probe Comp signal (see “Use Auto Scale" on page 26).
4 Press the channel key to which the probe is connected ([1], [2], etc.).
5 In the Channel Menu, press Probe.
6 In the Channel Probe Menu, press Probe Check; then, follow the
instructions on- screen.
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