Trigger Controls, Connector, And In D Ic A To R - Tektronix 2213 Instruction Manual

Operating Instructions— 2213 Service
DC— A ll components o f the signal are coupled to
the trigger circuitry. This position is useful for
displaying low-frequency or low-repetition-rate
signals.
DC-MO—External trigger signals are attenuated by
a factor of 10.
(25) SOURCE Switch—Determines the source o f the
trigger signal that is coupled to the input o f the
trigger circuit.
IN T—Permits triggering on signals that are applied
to the CH 1 OR X and CH 2 OR V input con­
nectors. The source o f the internal signal is
selected by the INT switch.
Provides a triggering signal from a sample
L IN E —
of the ac-power-source waveform. This trigger
source is useful when channel-input signals are
time related (multiple or submultiple) to the
frequency the power-source-input voltage.
on
E XT-P erm its triggering on signals applied to the
EXT INPUT
connector.
„ g Trigger controls, connector, and indicator.
Figure *"
2-6
(26) INT Switch — Selects the source o f the triggering
signal when the SOURCE switch is set to INT.
CH 1—The signal applied to the CH 1 OR X input
connector is the source of the trigger signal.
VERT
determined by the signals selected fo r display by
the VERTICAL MODE switches.
CH 2— The signal applied to the CH 2 OR Y input
connector is the source o f the trigger signal.
( 2 ^ LEVEL Control— Selects the amplitude point on the
trigger signal at which the sweep is triggered.
( 2 ^ TR IG 'D Indicator— The light-emitting diode (LED)
illuminates to indicate that the sweep is triggered.
(29) SLOPE Switch— Selects the slope of the signal that
triggers the sweep, (also refer to TV Signal Displays
at the end of Section 2).
_ /~ — Sweep
portion o f the trigger signal.
~ \_ — Sweep
portion o f the trigger signal.
( 3 ^ MODE Switch—Determines the trigger mode fo r the
sweep.
AUTO—Permits triggering on waveforms having
repetition rates o f at least 20 Hz. Sweep free-runs
in the absence o f an adquate trigger signal or when
the repetition rate is below 20 Hz. The range o f
the TRIGGER LEVEL control w ill compensate
fo r the amplitude variations o f the trigger signals.
NORM—Sweep is initiated when an adequate
trigger signal is applied. In the absence of a trigger
signal, no baseline trace w ill be present. Triggering
on television lines is accomplished in this mode.
TV FIELD— Permits triggering on television field-
rate signals (refer to TV Signal Displays at the end
of Section 2).
(S i) VAR HOLDOFF C ontrol—Provides continuous con­
trol o f holdoff time between sweeps. Increases
3 3 97-0 7
the holdoff time by at least a factor o f four. This
control improves the ability to trigger on aperiodic
signals (such as complex digital waveforms).
MODE— The internal trigger source is
is triggered on the positive-going
is triggered on the negative-going
REV NOV 1981