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254 PI-MAX
®
4 System Manual Issue 4
17.12 Gating Pulse Artifact Strings Displayed
PI-MAX4:512/1024 EM(B) cameras may experience noise in the form of gating pulse
artifacts, sometimes referred to as Machine Gun” dots, during readout. Figure 17-6 shows a
typical display with numerous gating pulse artifact strings displayed.
Figure 17-6: Typical Diagonal Line of Gating Pulse Artifacts
The “machine gun” effect may be observed when a PI-MAX4:512/1024 EM(B) camera has
been configured for:
• A very large number of on-chip accumulations;
• Interline Overlapped Mode
In this mode, as one frame of data is being read out, the intensifier is being gated
and the next frame of data is being exposed. The gating pulse artifacts are the result
of a 200 V gate pulse’s being emitted approximately 1 inch from the camera’s CCD.
Refer to Section 5.8.1, Interline CCD Readout, on page 71 for additional
information.
Recommended solutions include:
• Configure the system for fewer on-chip accumulations.
• Operate in Full-Frame mode.
This will prevent gating during readout. Refer to Section 5.8.2, Full-Frame CCD
Readout, on page 74 for additional information.
• Increase the EM Gain so that pulse artifact levels are minimized while desired
signal levels are amplified. Refer to Section 14.1.2, EM Gain Mode, on page 208
for additional information.
4411-0137_0179
GATING PULSE
ARTIFACT STRING