9.5.2 Notes on Intensifier Operation
CAUTION: Do NOT point the intensifier at bright lights or permanent damage to the intensifier
tube may result.
• The INT_PULSE (which is a camera-internal signal) follows negative logic, i.e. the Intensifier
is "off" when this pulse is HIGH; the Intensifier is "on" when this pulse is LOW. This pulse is
used under s/ware control to protect the Intensifier against “photon overload”.
• The pwr on default status of the INT_PULSE is HIGH. This will cut off all light to the camera
(protecting the Intensifier, since it is quite likely that a user may power up the camera before
connecting the cable required to view an image and may accidentally cause damage to the
Intensifier by pointing to a bright source of light for indefinite periods of time). Software will
have to be enabled to turn on the intensifier, by using the IMD [ION,PON,SON] command (see
below). Some apps (e.g. CView) will do this on "connect"; others will follow a more elaborate
process, requiring the user to "enable" the intensifier.
• Command "IMD ION": sets the INT_PULSE to be always LOW; this will set the Intensifier in
the ON state, allowing its gain to be adjusted using the IGN command.
• Command "IMD IOF": sets the INT_PULSE to be always HIGH; this will turn OFF the
Intensifier.
• Command "IMD PON": Sets the Intensifier in the pulse mode; toggling the signal INT_PULSE
once per frame, with a delay IPD (from the falling edge of ENF) and duration IPO.
1/10 sec
EN_FRAME
IPD
IPO
INTENSIFIER OFF (High)
INTENSIFIER
ON (Low)
Intensifier
gating pulse
• IPO: This parameter defines the “ON” or “LOW” time of the Intensifier Pulse in either the
PON(Long) or SON(Short) pulse mode. Depending on the IMD setting (i.e. IMD SON or IMD
PON) the range and the increment of the “ON” time is different. In the PON mode, it is from
25µs to 82.5ms, with 25µs increments .. requiring a three digit hex argument ranging from
001(25µs) to CDA (82.5ms). In the SON mode, it is from 50ns to 204.8µs, with 50ns
increments .. requiring a three digit hex argument ranging from 001(50ns) to FFF (204.8µs).
• IPD: range is from 50ns to 10us, with 50ns increments .. requiring a two digit hex argument
from 00(0ns) to FE(10us) in 50ns increments. Note: FF is not valid.
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