Tektronix TPS2012B, User Manual

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Reference
Source Options.
Source option Details
Channel 1, 2, 3 1 , or 4 1 Triggers on a channel whether or not the waveform is
displayed
Ext Does not display the trigger signal; the Ext option uses the
signal connected to the Ext Trig front-panel BNC and allows a
trigger level range of +4 V to -4 V
Ext/5 Same as the Ext option, but attenuates the signal by a factor
of
fi ve, and allows a trigger level range of +20 V to -20 V; this
extends the trigger level range
Ext/10 Same as the Ext option, but attenuates the signal by a factor
of ten, and allows a trigger level range of +40 V to -40 V; this
extends the trigger level range
1
Available only on a 4-channel oscilloscope.
NOTE.
To view an Ext, Ext/5, or Ext/10 trigger signal, push and hold down the
Trig View button.
Coupling.
Coupling allows you to fi lter the trigger signal used to trigger an
acquisition.
Option Details
DC Passes all components of the signal
Noise Reject Adds hysteresis to the trigger circuitry; this reduces sensitivity
which reduces the chance of falsely triggering on noise
HF Reject Attenuates the high-frequency components above 80 kHz
LF Reject Blocks the DC component and attenuates the low-frequency
components below 300 kHz
AC Blocks DC components and attenuates signals below 10 Hz
NOTE. Trigger coupling affects only the signal passed to the trigger system. It
does not affect the bandwidth or coupling of the signal displayed on the screen.
Pretrigger.
The trigger position is typically set at the horizontal center of the
screen. In this case, you are able to view fi ve divisions of pretrigger information.
Adjusting the Horizontal Position of the waveform allows you to see more or less
pretrigger information.
114 TPS2000B Series Digital Oscilloscope User Manual