Pyrocam IV Operator’s Manual Document No. 50337-001 Rev F 2/21/2017 Page 15
Set Gain Frame to Default
Click to set the gain frame to the default value of 1.0 for each pixel.
Pixel Gain Value
This is a dual operation control. It will display the current GC factor at the cursor selected
location, and can be used to enter a new value by editing its content and then clicking on
the adjacent button. Acceptable CG values are between 0.50 and 2.00.
3.3 Pulsed Operation
To operate with pulsed lasers, an external trigger must be supplied to the Pyrocam
TRIGGER connector. The relationship between the trigger pulse and the pulsed event
must meet certain timing and electrical requirements for correct operation. These
requirements are detailed in the following sections.
NOTE: Pulsed operation is the default operating mode for the Pyrocam on
power up. This is important to consider since users may start BeamGage with no
trigger pulses present. This results in the camera sitting idle and not collecting
frames, which could be confused as the camera not operating correctly.
3.3.1 Pulse Modes
Pulsed operation falls into three categories based on laser (trigger) pulse repetition rate.
One requires special external timing between the TRIGGER input pulse and the firing of
the laser. The three timing modes are designated as Pulse Modes 1, 2, and 3 and are
described in Figure 3.1 thru Figure 3.4.
Mode 1 describes operation when the laser fires at a trigger rate less than 3Hz. This
includes non-repetitive or Single Shot events. Trigger rate stability is not critical in this
mode. Positive Delay values can be programmed but not negative ones. Negative values
default to 0µs.
Mode 2 describes operations where the laser fires at a stable periodic rate of 3Hz to
115Hz. Mode 2 can also be used to split out a single pulse from a periodic burst of laser
pulses. When the trigger frequency exceeds 115Hz the Pyrocam will automatically switch
into Mode 3 timing.
Mode 3 is the high speed mode. This mode can operate up to about 1000Hz, but will
divide out trigger pulses to achieve a lower overall sample rate.
In all of the above modes the Exposure and Delay times must be adjusted so that the
resulting exposure time will contain the entire laser pulse. If these settings are not
correct, the Pyrocam may not capture the laser pulse, may capture only a portion of the
laser pulse, or may capture multiple laser pulses. Exposure time is adjustable from 1µs
to 40,000µs in 1µs increments. Delay times can be programmed from -3000µs to
+3,000µs in 1µs increments.
NOTE: When operating in pulsed mode, try to avoid periodic rates that border the
transitions between the three timing modes. This avoids erratic acquisition
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