Tektronix 2212 User Manual

Digital Storage Displays
SGL Sweep Roll Mode
In SGL Sweep Roll mode, the 2212 display continues to roll
although the trigger circuit is not armed. Press the RESET button to
arm the trigger circuit. The display continues to roll, until the
pretrigger portion of the waveform RECORD is filled. The READY
LED starts to light and the trigger point indicator (intensified dot)
appears on the waveform. The storage acquisition system now is
ready to accept a trigger event. When that trigger event occurs,
filling the remaining portion of the RECORD begins and the display
continues to roll. When the remaining portion of the RECORD is
filled, the READY LED dims and the display will be updated.
The time needed to fill the pretrigger and posttrigger portions of the
RECORD depends on :
- The sampling rate
- Seting of the PRE-TRIG 25%/75% switch.
Until a trigger occurs, the pretrigger data is continually updated,
but the RECORD display is not updated until a complete new
waveform is acquired.
With the 2212 in SGL Sweep Roll mode, the Vertical MODE is set
to ALT and Triggger SOURCE in VERT MODE, the triggered chan-
nel behaves as just described. The non-triggered channel is
blanked. When you press the RESET button again, the second chan-
nel is updated. For SGL Sweep Roll mode, you can use the follow-
ing procedure:
Step 1. Switch the 2212 on and obtain a baseline display in
Non-Store mode.
Step 2. Set the Store ON switch to the on state.
Step 3. Set the PRETRIGger switch to either 25% or 75% as
needed for your measurement.
Step 4. Apply a test signal to the CH 1 OR X input to be used for
setting the trigger LEVEL control.
For random signals, set the Trigger LEVEL control to trig-
ger the sweep on a signal that is approximately the same
amplitude as the random signal.
2212 User Manual
2-17

Tektronix 2212 Specifications

General

Brand	Tektronix
Model	2212
Category	Test Equipment
Language	English