Scientech S310 Vector - Manual (Page 21)

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8. To Measure a Statistical Run of Energy Pulses:
Note: Do not use AUTO range when making a statistical run.
Note: Do not go from the Average Power Mode to Stats since the range will be too high. Select
the range manually.
Note: When using the PHF09 pyroelectric detector in the long pulse setting, a manual range must
be selected when running statistics.
Note: Each time a new stats run begins, data from the previous run is lost. If statistical data is to
be saved, it must be done though the digital interface.
Note: To exit the statistical mode at any time, press the CANCEL button.
Note: Statistics mode can collect data at repetition rates of up to 750 Hz depending on the
detector model.
The statistics mode will collect data on a pulse population of up to 1000 pulses. At your prompting, the
indicator will display the number of pulses delivered, average energy, minimum energy, maximum energy,
standard deviation, and coefficient of variation. When the statistics mode is selected, the energy mode is
automatically activated regardless of the mode previously selected. Select the appropriate range for the pulse
energy level to be measured. It is very important to select the most appropriate range. If you have selected a
manual range and the laser pulse(s) has overflowed the maximum energy of the range, OF will be displayed
when the data is recalled. You should then select a higher range.
To enter into the statistics mode:
A. Press the STATS button. The number of pulses in the last statistics run will appear in the display.
B. Use the RANGE (count up) and MODE (count down) buttons to change the display to the desired
number of pulses to include in the statistics run (up to 1000).
C. Press the SELECT button to enter the pulse population to memory.
D. Press the SELECT button to begin the run. The indicator will automatically stop once the data has been
collected.
E. Press the STATS button to recall the data to the display. The STATS button must be pressed each time
to recall each of the following statistical calculations:
Number of pulses collected
Average energy (AVG)
Minimum energy (MIN)
Maximum energy (MAX)
Standard deviation (SIGMA)
Coefficient of variation (CV%)
F. After recalling the statistical information, the flashing STATS annunciator indicates that the S310 is
ready for a new run.
G. Press the SELECT button to start a new run (each time a new run begins, data from the previous run is
lost) or press the CANCEL button to return the indicator to the mode of operation in effect prior to
statistics mode.
9. External Trigger:
The automatic trigger threshold of the S310 is 7 % of full scale. The external trigger function is designed for
single pulse energy measurement with a calorimeter. It does not improve the trigger circuit of the S310 with
pyroelectric detectors.