Teledyne Princeton Instruments PI-MAX 3, Системное руководство

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Chapter 2 PI-MAX3 Camera System 25
Refer to Table 2-1 for information about each rear-panel connector and indicator.
Table 2-1: PI-MAX3 Rear-Panel Connectors and Indicators (Sheet 1 of 2)
Label Description
MONITOR BNC port for TTL logic 1 pulse delayed ±3 ns with respect to
photocathode gating.
Cable delay, ~1.5 ns/ft, will be in addition to the delay at the connector.
I.I.T PWR ON/OFF This switch biases the image intensifier photocathode ON or OFF.
• When the I.I.T. switch is set to ON, the photocathode can be gated
ON.
Exception: Selecting SAFE on the Experiment Setup Main screen
overrides control and will prevent the photocathode from being
biased on regardless of the I.I.T. switch setting.
• When the I.I.T. switch is set to OFF, then the photocathode cannot
be turned on from software.
CAUTION:
It is advisable to set the I.I.T. switch to OFF as a fail-safe
measure if the PI-MAX3 is left ON but unused for a period of
time.
ERROR This RED LED lights to warn of excessive repetition rate.
Must be off for proper operation.
NOTE: Excess Rep Rate LED is also activated by MCP bracket pulsing.
The MCP bracket repetition rate limit is 6.25 kHz.
TRIGGER IN When external triggering is selected within the software, the internal
timing generator will be triggered by an externally derived trigger pulse
(range of ±5.5 V) applied to this input.
The threshold, slope, coupling mode (i.e., AC or DC,) and input
impedance (i.e., High or 50

,) are selectable in software.
The corresponding Green LED flashes each time PI-MAX3 is triggered. At
high repetition rates, the LED glows steadily.
NOTE: In gated operation, the Green LED indicator flashes each time
the PI-MAX3 is triggered. The actual triggering can also be
readily determined by observing the signal at the PI-MAX3
Monitor output with a fast oscilloscope.
COOLANT PORTS:
• OUT
• IN
Two standard ¼” barbed brass fittings for circulating coolant are located
on the back panel.
Either port may be used as the inlet.
The coolant cannot be chilled.
Use the Teledyne Princeton Instruments CoolCUBE
II
coolant circulator.
For additional information, refer to:
• Section 5.5, Connect PI-MAX3 to CoolCUBE
II
, on page 45
• Section 7.5, Temperature Control , on page 68.
NOTE: Although circulating water will extend the PI-MAX3's cooling
capabilities, it is not necessary. Most of the PI-MAX3 cooling is
provided by the fan.
READY OUT Level at this BNC is initially LOW.
It changes state on completion of cleaning cycles before the first exposure.