User`s guide

176 53220A/53230A User’s Guide
5 Triggering and Gating
[SENSe:]FREQuency:BURSt:GATE:TIME {<time>|MINimum|
MAXimum|DEFault}
[SENSe:]FREQuency:BURSt:GATE:TIME? [{MINimum|MAXimum|
DEFault}] (query form)
[SENSe:]FREQuency:BURSt:GATE:DELay {<delay>|MINimum|
MAXimum DEFault}
[SENSe:]FREQuency:BURSt:GATE:DELay? [{MINimum|MAXimum|
DEFault}] (query form)
- time sets the gate time for measuring the pulse burst carrier frequency. For
accurate results, the gate window (open/close) must be within the threshold
detector’s (-6 dB, -12 dB) sensitivity range. The range for time is
1 µs to 100s with 10 ns resolution.
Following a reset (*RST) or instrument preset (SYSTem:PRESet or Preset
key), the gate time is set to 1 µs.
- delay sets the gate delay at the start of the measurement. The delay starts
when the input level reaches the detector threshold (-6 dB, -12 dB) set by the
INPut3:BURSt:LEVel command. The delay range is 0s to 10s, with 10 ns
resolution.
Following a reset (*RST) or instrument preset (SYSTem:PRESet or Preset
key), the delay is set to 0.0s.
Carrier Frequency Configuration Example
The following example shows a typical configuration for a burst carrier fre-
quency measurement. In the example, the gate delay and gate time are set
manually. If the characteristics of the pulse are unknown, the “on time” can be
measured separately to insure that the delay and time are set within the
threshold detector’s sensitivity range (see Chapter 3 for more pulse measure-
ment examples).
// measure the on time of the burst to determine