Triggering
TDS 340A, TDS 360 & TDS 380 User Manual
3–13
allows only the low-frequency components to pass on to the triggering
system. High-frequency reject mode attenuates signals above 30 kHz.
H Press LF Reject to select low-frequency reject mode. Low-frequency
rejection is the opposite of high-frequency rejection. Low-frequency reject
mode attenuates signals below 80 kHz.
H Press Noise Reject to select noise reject mode. Noise rejection provides DC
low sensitivity, but it requires additional signal amplitude for stable
triggering.
Press the main-menu button Slope. Use the top two side-menu buttons to switch
between positive-going and negative-going slope.
Press the main-menu button Level. Use the side menu to select from these
options:
H Use the General Purpose Knob to adjust trigger level. (Note that this
selection performs the same function as the trigger LEVEL knob on the front
panel.)
H Press Set to TTL to automatically set the trigger level to the TTL switching
threshold.
H Press Set to ECL to automatically set the trigger level to the ECL switching
threshold.
H Press Set to 50% to set the trigger level to the midpoint of the trigger source
signal. (Note that this selection performs the same function as the SET
LEVEL TO 50% button on the front panel.)
Press the main-menu button Mode. Use the side menu to select either Auto or
Normal mode.
In normal trigger mode, the oscilloscope waits for a valid trigger from the trigger
signal source. In auto trigger mode, the oscilloscope produces an internal trigger
in the absence of other trigger events.
At horizontal scale settings of 100 ms per division and slower, auto trigger mode
switches to an untriggered roll display. When the display is in “roll” mode the
envelope and average acquisition modes does not work properly, and the display
does not show a trigger “T” on the waveform.
Press the main-menu button Holdoff to activate the General Purpose Knob. Use
the knob to adjust holdoff; the TDS 300 Series have a holdoff range of 500 ns to
10 s. Press the side-menu button Set to Min to quickly set the holdoff to 500 ns.
Change Trigger Slope
Adjust Trigger Level
Select Trigger Mode
Adjust Holdoff
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