Auto Setup - Tektronix 222 Operator's Manual

Section 4-222 DSO Oscillosco~e
SECTION
4
HOW IT WORKS
4.1 TURN ON
Press to start the oscilloscope. An audible beep is
sounded when the oscilloscope comes on. A few seconds are
needed to warm the crt heater before a display becomesvisible.
Press again to turn it off; battery power is always connected.
NOTE
If the AUTO TIMEOUT feature is on, the oscilloscope
turns itself off to conserve battery power if there is no
control activity in a two-minute period. The AUTO
TIMEOUT feature is disabled when an external source
is used to power the oscilloscope.
4.2 AUTO SETUP
Press
to auto range on the signal(s) at the probe tip(s).
A channel that has no signal applied is turned off (except if neither
channel has a signal applied, then CH
1
remains on). If a channel that
is off has a signal applied, Auto Setup turns the channel on. TheVerti-
cal controls default to the "on" channel when only one is on, and the
SECIDIV and Trigger LEVEL settings are autoranged to that channel's
applied signal. Channel
1
is the default channel
if
both channels have
a signal applied. See Section
6,
para.
6.1
for the default control set-
tings and events that occur with an an auto setup.
NOTE
AUTO SETUP does not set the SECIDIVsettinginto the ROLL
region (0.1 sldiv and slower). The practicallow frequency for
using the AUTO SETUP feature is about 20 Hz.