Specifications

To display signals automatically using Autoscale
•
To configure the instrument quickly, press
Autoscale
.
Autoscale displays all connected signals that have activity.
•
To undo the effects of autoscale, press
Setup
, then press
Undo
Autoscale
.
How Autoscale Works
If there is at least one oscilloscope or digital channel with an active signal, the
instrument turns off all other channels having no activity, and turns on all
channels having activity.
A scope channel is active if it is at least 10 mVp-p. Autoscale finds dc
(> 50 mV) on the HP 54645A/D scope channels. The scope channels that are
on are scaled vertically to best fit the screen.
For testing for digital channel activity, TTL, ECL, and variable thresholds are
used (in that order). Digital channels not previously displayed will be added
below those channels already displayed, with the lowest-numbered channel
at the top. Higher-numbered channels will be displayed in order down the
display.
The instrument checks for activity using a time window of 20 ms, allowing it
to recognize signals as slow as 50 Hz for autoscaling. If the instrument does
not find any channel with an active signal, it restores the setup to the
pre-autoscale state.
Front-Panel Overview
To display signals automatically using Autoscale
2-19