Getting Started 1
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 29
Autoscale 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 where no signal is found
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 Autoscale, 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 27).
2 Press [Default Setup] to recall the default oscilloscope setup (see "Recall the
Default Oscilloscope Setup"
on page 27).
3 Press [Auto Scale] to automatically configure the oscilloscope for the Probe
Comp signal (see "Use Autoscale" on page 28).
4 Open the Channel dialog box (from the menu, choose Sources > Channel N...)
where N is the channel to which the probe is connected (1, 2, etc.).
5 Select Probe....
6 In the Probe dialog box, select Probe Check; then, follow the instructions
on-screen.
If necessary, use a nonmetallic tool (supplied with the probe) to adjust the
trimmer capacitor on the probe for the flattest pulse possible.
On N2894A probes, the trimmer capacitor is located on the probe BNC
connector.
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