Time resolution in the range from less than 50 nanoseconds to 1 millisecond is readily achieved by use of a Gated Optical Multichannel Analyzer (OMA). The OMA has high sensitivity from the vacuum ultra violet to the near infra red. Shutter ratios in excess of 106 are obtained under some conditions. Linear operation has been shown for CW and pulsed sources. The pulsed source case was investigated for rapidly pulsed sources and for sources pulsed at intervals. Overall system gamma was unity within 2%.