Chapter 6 6-85
Front-Panel Key Reference
Sweep
Edge Setup Accesses menu keys that allow you to set up edge
triggering. Key Access:
Sweep, Gate Setup
Edge Pos Neg
Sets the polarity for edge triggering of the gate. When
Edge (Pos) is pressed, a positive-going edge will trigger
the opening of the gate, after the delay set with the
Gate
Delay key. When Edge (Neg) is pressed, a negative-going
edge will trigger the opening of the gate after the set
delay. Key Access:
Sweep, Gate Setup, Edge Setup
Gate Delay
Controls the length of time from the trigger until the
gate is turned on. Key Access:
Sweep, Gate Setup, Edge
Setup
Gate Length
Controls the length of time that the gate is on when
using edge triggering to control the gate. Key Access:
Sweep, Gate Setup, Edge Setup
Level Setup Sets up level polarity that will open the gate. Key
Access:
Sweep, Gate Setup
High
Selects a high TTL level to open the gate. Key Access:
Sweep, Gate Setup, Level Setup
Low
Selects a low TTL level to open the gate. Key Access:
Sweep, Gate Setup, Level Setup
Points Allows you to set the number of points per sweep, from 101 to 8192 in
non-zero span and 2 to 8192 in zero span. Use the knob, step keys, or
numeric keypad to set this value. When the sweep time is limited by the
Analog to Digital Converter (ADC) sample rate, the sweep time changes
with the number of points selected. The greater the number of points,
the longer the sweep time becomes. If
Preset is pressed, or the analyzer
power is cycled, the number of points per sweep will default to 401. The
current value of points is displayed next to the sweep time (refer to
page 2-14).
Changing the number of points has several effects on the analyzer.
Since markers are read at the point location, the marker reading may
change. Press
Peak Search, again for greater accuracy in the marker
reading. All trace data for the current window is cleared. If in
continuous sweep mode,
(Sweep, Sweep (Cont)), a new sweep begins
immediately. If average is on
(BW/Avg, Average (On)), the averaging
starts over with a count of 0.
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