User guide

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Single
Performs a single sweep. Before a single sweep is triggered, the SignalHawk will
display the previous sweep. To begin a sweep, press the Manual Trigger soft
key. After the sweep finishes, it will display the results and stop sweeping.
Trigger - Sets the type of trigger that initiates a sweep. There are four types of
trigger to choose from:
 Internal Continuous - Sweeps continuously and is controlled by the Sig-
nalHawk.
 Internal Single - Sweeps once when triggered. Controlled by the Signal-
Hawk through the Arm Trigger soft key.
 External Continuous - See “External Trigger” below.
 External Single - See “External Trigger” below.
Note: Useful for signals that are time varying, such as ones that
change slow enough to trigger manually as well as carrier/interfer-
ence ratios. See “Carrier-to-Interference Ratio” on page 94.
Arm Trigger - Manually initiates a sweep.
External Trigger
External - Low Level / High Level /
Rise Edge / Fall Edge / Either Edge
 Low Level - Triggers if input = 0 ± 0.5 V (TTL “Low”).
 High Level - Triggers if input = 4.2 ± 0.8 V (TTL “High”).
 Rise Edge - Triggers if the input goes from “Low” to “High”.
 Fall Edge - Triggers if the input goes from “High” to “Low”.
 Either Edge - Triggers if the input goes from either “High” to “Low” OR
“Low” to “High”.
Gate Delay
Length of wait after the trigger signal and before beginning a sweep. The range
is 100 μs to 1 s.