Autoscale; Setting Up The Instrument - HP 54620A Programmer's Manual

Logic analyzer

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Programming Getting Started

Autoscale

The :AUToscale feature performs a very useful function on unknown

waveforms by setting up the instrument logic thresholds, initial channel

settings, and time base.

The syntax for the autoscale function is:

:AUTOSCALE<terminator>

A typical logic analyzer setup would set the threshold voltages, turn on the

appropriate channels, and set up the sweep speed, delay time, trigger mode,

trigger type, and trigger specification. An example of the commands sent to

the logic analyzer is as follows:

:LCHANNEL:THRESHOLD LCHAN0_7, TTL<terminator>

:LCHANNEL:THRESHOLD LCHAN8_15, ECL<terminator>

:BLANK LCHANNEL7<terminator>

:BLANK LCHANNEL12<terminator>

:BLANK LCHANNEL13<terminator>

:TIMEBASE:RANGE 100US;REFERENCE CENTER;DELAY 1.5US<terminator>

:TRIGGER:TYPE EDGE;EDGE LCHANNEL3,FALLING<terminator>

:TRIGGER:MODE NORMAL<terminator>

This example sets channels 0 through 7 to TTL thresholds, sets channels 8

through 15 to CMOS thresholds, and turns off channels 7, 12, and 13 (the

:BLANk command). It sets the sweep speed to 100 µs/div, with time

reference at center and positive delay of 1.5 µs. Finally, it sets the trigger

mode to normal with an edge trigger on the falling edge of channel 3.

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