Agilent Technologies N8201A Service Manual Page 226

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226 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz
12 Marker Fctn
Example:
CALC:MARK2:FCO ON
CALC:MARK2:FCO:X? returns the counted frequency.
Gate Time
Controls the length of time during which the frequency counter measures the signal
frequency. For 2 ms and longer gate times, the counter resolution is 0.001 Hz. Longer gate
times allow for greater averaging of signals whose frequency is “noisy”, at the expense of
throughput. If the gate time is an integer multiple of the length of a power-line cycle (20 ms
for 50 Hz power, 16.67 ms for 60 Hz power), the counter rejects incidental modulation at the
power line rate. The shortest gate time that rejects both 50 and 60 Hz modulation is 100 ms,
which is the value chosen when gate time is in
Auto.
Key Path: Marker Fctn, Marker Count
State Saved: Saved in Instrument State.
Factory Preset: Auto, 100 ms
Range: 1 μs to 500 ms
Remote Command:
:CALCulate:MARKer:FCOunt:GATetime:AUTO OFF|ON|0|1
:CALCulate:MARKer:FCOunt:GATetime:AUTO?
:CALCulate:MARKer:FCOunt:GATetime <time>
:CALCulate:MARKer:FCOunt:GATetime?
Example:
CALC:MARK:FCO:GAT:AUTO On
CALC:MARK:FCO:GAT 1e-2 sets the gate time to 10
-2
s = 10 ms.
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