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2-33 Sweep Menu Spectrum Analyzer
2-66 PN: 10580-00349 Rev. M Spectrum Analyzer MG
Triggering Menu
Key Sequence:
Shift > Sweep
(
3
) key
> Triggering
This menu is available only in Zero Span.
Source: Displays the “Trigger Source Menu” on page 2-67 .
Delay XX %: Used when External or Video is selected in the Trigger Source
menu. Measurement begins after set time delay once the trigger has
occurred.
Use the numeric keypad, rotary knob, or arrow keys to change the delay
value. When using the numeric keypad, the Units menu is displayed. Press
the appropriate key to enter the trigger delay value as a percentage of the
sweep time or a fixed value in units of ns,

s or ms.
A negative delay displays the trigger position on screen, while a positive
value places the trigger point off the screen to the left.
Level: Sets a trigger level to initiate a measurement when Video or IF Power
is selected in the “Trigger Source Menu” on page 2-67 . Press this key, then
use the rotary knob, arrow keys, or numeric keypad to enter the trigger power
level. The value ranges from –150 dBm to +30 dBm.
Slope: Sets the trigger slope to rising or falling.
Hysteresis: When used, value unit is in dB. Hysteresis can be used with
Level and Slope when setting a measurement trigger. Hysteresis is used to
prevent undesired triggering when the signal is hovering near the trigger
value. For example, the Level is set to 10 dBm, the Slope is set to Rising,
and Hysteresis is 1 dB. The first trigger occurs when the signal reaches at
least the 10 dBm level. To trigger again, the signal must drop below 9 dBm
before returning to 10 dBm. For another example, with Level set to 10 dBm,
slope set to Falling, and Hysteresis set to 1 dB, the opposite must occur to
activate a trigger. The signal amplitude falls and a trigger occurs when the
signal reaches the 10 dBm level. The signal must then reach at least 11 dBm
before falling to 10 dBm and initiating a trigger.
Holdoff: Delays the next trigger to the time set regardless of triggers
occurring within the set time.
Force Trigger Once: Forces a sweep regardless of meeting any trigger
criteria.
Back: Returns to the “Sweep Menu” on page 2-64 .
Figure 2-51. SPA Triggering Menu
Triggering
Delay
-1.0 %
Hysteresis
1.0 dB
Holdoff
0 ns
Force Trigger Once
Level
10.0 dBm
Slope
Rising Falling
Back
Source