User`s guide

Triggering 4
InfiniiVision Oscilloscopes User’s Guide 95
Trigger Output
You can select one of the following signals to be output at the TRIG OUT connector on the
rear panel of the oscilloscope:
• Triggers
• Source frequency
• Source frequency/8
• Mask test pass/fail (see “Mask Test Trigger Output” on page 342.)
Triggers
This is the default selection. In this mode, a rising edge is output each time the
oscilloscope triggers. This rising edge is delayed 17 ns from the oscilloscope’s trigger
point. The output level is 0-5 V into an open circuit, and 0-2.5 V into 50 .
Source Frequency
This mode is only available when the oscilloscope is set to positive or negative edge
trigger on a front-panel source (analog channel or the external input of a 2-channel
oscilloscope). In this mode, the TRIG OUT BNC is connected to the output of the trigger
comparator. The output level is 0-580 mV into an open circuit, and 0-290 mV into 50 .
The maximum frequency output is 350 MHz due to the bandwidth limitation of the TRIG
OUT BNC amplifier. This selection is useful for driving an external frequency counter.
Source Frequency/8
This selection produces the same signal as described in Source frequency except the
output frequency is one-eighth of the trigger comparator output frequency. This mode is
useful when your input signal is faster than 350 MHz.
The Trigger Out connector also provides the User Cal signal. See “User Calibration” on
page 394.