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Version 1.A Model IIC-200 Operation Manual 13
Power Up Steps
➧ Make sure the front-panel MCP Power switch is Off. Adjust MCP Gain to minimum
and turn on the chassis power.
Note:
As long as the image intensifier and IIC-200 are purchased from Roper
Scientific as part of the same order, the upper limit circuit will be set for the
maximum safe limit of the intensifier. In this case, the maximum voltage may be less
than -1000 V.
➧ After the MCP voltage has been properly set, set the MCP Power switch on and
slowly bring up the MCP voltage to the desired setting. High voltage will now be on
the intensifier. It is normal for the alarm beeper to sound when power is first applied.
However, if it continues to sound, set the MCP power switch off and determine the
cause (e.g. switch set to Shutter instead of Gate or excessive light on the
Photocathode).
If the intensifier is operated at excessive MCP voltage, ion feedback may occur. If
allowed to continue this condition may damage the intensifier. Therefore, be sure to
monitor the light output from the intensifier (usually done by reading the CCD or other
readout device) when increasing the MCP voltage setting. A sudden increase in output
light, especially if not related to light on the input, is evidence of ion feedback. As
intensifier tubes age, they sometimes become more susceptible to ion feedback, so it is
advisable to check rather than to rely entirely on the factory limit setting.
➧ For initial set-up, the Brightness Control feature can be used. Set the Auto Bright
Control switch to the on position. This will reduce MCP voltage (and hence gain) in
proportion to light level, so a greater range of input light can be tolerated. The alarm
is still functional in this mode, and the intensifier voltage will still be shut down in
case of excessive exposure levels. Be sure to set the Auto Bright Control switch off
before taking data, or the intensifier will be nonlinear.
The High Voltage Cable
Two versions of the 6-pin high voltage cable have been shipped by Roper Scientific.
Early high-voltage cables have a white housing. Later ones have a black housing and a
white stripe. These cables are wired differently. The IIC-200 is compatible with the
newer style cables only.
If you have an older style Princeton Instruments image intensifier unit, originally
supplied with the old-style cable, it will be necessary to return intensifier back to Roper
Scientific to be updated before it can be used with the IIC-200. Intensifiers for use with
black cables always have 6 conductors on the intensifier connector.
The cable with the white housing is unsafe if not used strictly according to instructions.
If a white cable is connected at one end only to an IIC-200 and the IIC-200 is turned on,
arcing at the open end of the cable is likely and could cause painful and possibly
hazardous electrical shock. Roper Scientific can update any white cable and 4 conductor
image intensifier combination to the black-cable 6-conductor combination. Roper
CAUTIONCAUTION
WARNING