Scientech S200 Vector - Manual (Page 17)

Log Units of Measure
When a dual channel indicator is being used as a ratiometer, log units of measure may be displayed. Use the
FUNCTION button to start the menu cycles as described in the Function Menu Cycles section. Press the
SELECT button when the LOG annunciator appears.
Analog Output
Pyroelectric Channels
Analog output is accessible from the 50 ohm terminated BNC connector on the rear panel labeled Analog
Output. The analog output is calibrated to 10 volts full scale on all ranges.
The 50 ohm terminated BNC connector labeled Pulse Out provides a profile of the analog signal from the
pyroelectric sensor. The peak voltage level is set to 10 volts full scale on all ranges.
Calorimeter Channels
In power mode, the analog output is calibrated to 10 volts full scale and is accessible via the 50 ohm
terminated BNC connector labeled Analog Output. In energy mode, the analog output is an amplified voltage
signal representative of the voltage generated by the calorimeter thermopile. To calculate energy using the
analog output, follow the equation:
1 (10/30 range)
J = (Vpk)(TC)
ч 10 ч 10 (1/3 range)
Cal 100 (.1/.3 range)
1000 (.01/.03 range)
where:
Vpk is the peak voltage, TC is the time constant listed on the calorimeter serial tag, and Cal is the calorimeter
output in V/W.
The analog output is set at Scientech and should not be adjusted without consulting the factory.
Joulemeter Sensor Operation With Oscilloscope
The joulemeter sensors may be hooked-up directly with a 1 M
Ω input oscilloscope. The peak output voltage
of the sensor divided by the V/J sensitivity = energy (joules).
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