Scientech S310 Vector - Manual (Page 26)

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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 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 external trigger input is located on the rear panel of the S310 as shown in Figure 2. The external trigger
function is designed to ensure the entire pulse energy of a single pulse is captured by the S310 indicator. An
external trigger “awakens” the S310’s circuitry so that it is ready for the arrival of the laser pulse. The external
trigger pulse must have the following characteristics:
1. 2.5 volts min. to 5 volts max.
2. A minimum pulse width of 10 µsec. to a maximum of the laser pulse repetition rate.
3. A maximum rise/fall time of 500 nsec.
4. Delivered 1 to 3 milliseconds prior to the laser pulse.
The trigger is generated on the rising edge of the incoming pulse.