5-42
IM AQ6370D-01EN
Gate Sampling Measurement
Gate sampling can be used to measure data only when the gate signal is active during
sweeping. By applying an external signal (gate signal) synchronized to the pulse light
emission to the AQ6370D, you can efficiently measure pulse light.
Because the gate signal and the sampling time are asynchronous, not all light pulses
may be sampled when a single sweep is performed.
When the AQ6370D measures several times in repeat sweep mode using the MAX
HOLD function, all the light pulses can be sampled, enabling the full waveform can be
displayed.
Because the AQ6370D does not show data that is sampled when the gate signal
is inactive, the wavelength data during this period may be missed, but because
the sampling time and gate signal (pulse light) are asynchronous, performing
repeat sweep using the MAX HOLD function eventually results in all the waveform
data in the span range to be shown.
* For details on the MAX HOLD function, see section 6.3.
First sweep
Pulse light
Sampling
Gate signal
Waveform display
second sweep
The broken line shows the MAX HOLD waveform of the first sweep.
(appears at a position
different from the first)
Sweeping
Pulse light
Gate signal
Sampling
Waveform display
5.15 Pulse Light Measurement
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