Tektronix TDS 500C User Manual

Triggering on Waveforms

TDS 500C, TDS 600B, & TDS 700C User Manual

To trigger on the next valid trigger event and then stop, press SHIFT FORCE
TRIG. Now press the RUN/STOP button each time you want to initiate the
single sequence of acquisitions.

To leave Single Trig mode, press SHIFT ACQUIRE MENU ➞ Stop Af-
ter (main) ➞ RUN/STOP Button Only (side).

See the description under Stop After on page 3–35 for further discussion of
single sequence acquisitions.

(Single sequence triggering is not available in InstaVu mode; see Incompatible
Modes on page 3–58.)

To ascertain the state and setup of the triggering circuit, use the trigger status
lights, readout, and screen.

Trigger Status Lights.  To quickly determine trigger status, check the three status
lights TRIG’D, READY, and ARM in the Trigger control area. (See Fig-
ure 3–35.)

 When TRIG’D is lighted, it means the oscilloscope has recognized a valid

trigger and is filling the posttrigger portion of the waveform.

 When READY is lighted, it means the oscilloscope can accept a valid trigger

event and the oscilloscope is waiting for that event to occur.

 When ARM is lighted, it means the trigger circuitry is filling the pretrigger

portion of the waveform record.

 When both TRIG’D and READY are lighted, it means the oscilloscope has

recognized a valid main trigger and is waiting for a delayed trigger. When
the oscilloscope recognizes a delayed trigger, it will fill in the posttrigger
portion of the delayed waveform.

 When ARM, TRIG’D, and READY are all off, the digitizer is stopped.

 When ARM, TRIG’D, and READY are all lighted (TDS 500C and

TDS 700C models only), FastFrame or InstaVu modes are in effect. No
trigger status monitoring is taking place.