Tektronix 2212 - Page 114

Trigger
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- LF REJ (Low Frequency Reject) - In the LF REJ cou-
pling position, the low-frequency components from the
trigger input signal (below 30 kHz), are attenuated.
"LFrej" is displayed in the crt trigger readout field.
NOTE
LF REJ trigger coupling is useful for providing a stable
display of high-frequency components of complex
waveforms and eliminates low-frequency interference
or power supply hum from the trigger signal.
- DC - In the DC trigger coupling position, all frequency
components of the triggering signal are coupled to the
trigger circuit (DC to full bandwidth).
If the conditions, mentioned for the Trigger LEVEL
readout are not met, "DC" is displayed in the crt trigger
readout field.
NOTE
DC trigger coupling is useful for most signals, but it is
especially useful for providing a stable display of low-
frequency or low-repetition-rate signals.
In Detail