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Average Energy Mode
The average energy mode displays a running average of a selected number of pulses from 2 to 9999. Enter
into the average energy mode by pressing the MODE button until the “J AVG” annunciator appears in the
display. Press the SELECT button or simply wait a few seconds and the range in the display will
automatically be activated. The number of pulses to be averaged will appear in the display. To change the
number, press the RANGE (count up) and/or MODE (count down) buttons. When the desired number of
pulses to be averaged appears in the display, press the SELECT button. The maximum repetition rate is 300
Hz.
Average Power Mode
The average power mode displays the average power (watts) of repetitively pulsed lasers (minimum rep rate
of 10 pps). Select the appropriate range for the average power level to be measured. To enter into the
average power mode press the MODE button repeatedly until the “W AVG” annunciator appears. Press the
SELECT button or simply wait a few seconds and the S310 will automatically enter into its operational state
in the average power mode. The maximum repetition rate is 300 Hz
Statistics Mode
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. If you select AUTO range, the first few pulses of a run may be missed (not
counted) if the S310 has to internally change ranges. Therefore, if you want the first pulse to be counted, do
not select AUTO range. 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 press the STATS button. The number of pulses in the last run will appear in
the display. Use the RANGE (count up) and MODE (count down) buttons to change the display to the desired
number of pulses (up to 1000). Press the SELECT button to enter the pulse population to memory. Press the
SELECT button to begin the run. The indicator will automatically stop once the data has been collected.
Pressing the STATS button recalls the data to the display. The STATS button must be pressed for each event.
Once all of the data has been recalled, pressing the SELECT button starts a new run. Pressing the CANCEL
button returns the indicator to the mode of operation in effect prior to statistics mode.
External Trigger
The automatic trigger threshold of the S310 is 7 % of full scale. Energy values below 7% of full scale on any
range will not be displayed unless an external trigger is used. The external trigger input is located on the rear
panel of the S310. The external trigger pulse needs to 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.
The trigger is generated on the rising edge of the incoming pulse.
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