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92
PI-MAX
®
3 System Manual
Version 1.A
I.I.T. PWR On/Off switch:
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.
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:
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; MCP bracket
repetition rate limit is 6.25 kHz.
Trigger In:
When external triggering is selected in the software, the internal timing
generator will be triggered by an externally derived trigger pulse applied to this input.
The threshold (range of ±10 V), slope, coupling mode (AC or DC), and input impedance
(High or 50
) are selectable in software. The associated Green LED flashes each time
PI-MAX3 is triggered (glows steadily at high repetition rates).
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:
Two standard ¼
size 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 Princeton Instruments CoolCUBE
II
coolant circulator.
See
Making the Camera-Circulator Connections,
” page 25 and
page 36 for additional information.
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.
AUX I/O:
26-pin male DB connector. Provides the following five I/O signals (that can
be used to input a trigger to initiate data acquisition, to monitor frame readout
status, and to control an external shutter): T0 Out, Pre-Trigger In, SyncMASTER1,
General Purpose Input 0, and SyncMASTER2. Refer to "
", page 104, for more information.
Logic Out:
0 to +3.3V logic level output (TTL-compatible). WinView/WinSpec32
(
Ver. 2.5.25 or
higher) software-selectable Acquiring, Image Shift, Logic 1, Read Out,
Shutter, and Wait for Trigger signal.
When the
Invert LOGIC
check box is checked,
the output is at a logic low when the action is occurring.
Fan:
Ventilation fan that runs continuously to remove heat generated by the
thermoelectric cooler and the electronics. Air is drawn into the camera through the
rear grill, picks up the heat from the electronics and the cooler, and is then exhausted
through the side ventilation slots.
Caution
Summary of Contents for PI-MAX 3 System
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