External trigger, Single, External - low level / high level – Bird Technologies SH-36S-RM-Manual User Manual
Page 55: Gate delay
Settings
39
Single
Performs a single sweep. Before a single sweep is triggered, the Sig-
nalHawk 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:
z
Internal Continuous - Sweeps continuously and is con-
trolled by the SignalHawk.
z
Internal Single - Sweeps once when triggered. Controlled by
the SignalHawk through the Arm Trigger soft key.
z
External Continuous - See “External Trigger” below.
z
External Single - See “External Trigger” below.
Note:
Useful for signals that are time varying. Ones that
change slow enough to trigger manually as well as carrier/inter-
ference ratios. See “Carrier-to-Interference Ratio” on page 63.
Arm Trigger -
Manually initiates a sweep.
External Trigger
External - Low Level / High Level /
Rise Edge / Fall Edge / Either Edge
z
Low Level - Triggers if input = 0 ± 0.5 V (TTL “Low”).
z
High Level - Triggers if input = 4.2 ± 0.8 V (TTL “High”).
z
Rise Edge - Triggers if the input goes from “Low” to “High”.
z
Fall Edge - Triggers if the input goes from “High” to “Low”.
z
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.