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Chapter 6 LightField and Gated Operation 101
6.4.5 Configuration
MCP Bracket pulse implementation is enabled by selecting Bracket Pulsing ON from
within the host software. Figure 6-2 illustrates the timing diagram for bracket pulsing.
NOTE:
Because Gen III Intensifiers do not respond in the UV, bracket
pulsing is not available for these intensifiers.
Figure 6-2: Timing Diagram: MCP Bracket Pulsing
As shown in Figure 6-2, the insertion delay between Trigger In and T0 is approximately
12 ns, and the insertion delay between
Trigger In and Photocathode Gating is 35 ns.
NOTE:
The minimum delay between Trigger In and Photocathode
Gating
in bracket mode is 35 ns in order to allow the MCP to
achieve full gain before the photocathode is gated on.
Bracket
Aux Out
~12 ns
ŮPU
`PU
Trigger In
T0
T0 remains high for the
duration of the pulse ensemble.
Switches Photocathode OFF
Gates MCP ON and OFF
Delay is programmable.
Switches Photocathode ON
T0
T0
Off Off
Off Off
On
On
Photocathode Gating
Photocathode Gating
MCP Gating
MCP Gating
Gate Start
Gate Stop
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