PN 10795T 42
circumstances, the peak method accuracy usually falls between the numerical integration and initial
voltage interpolation methods.
SCIENTECH PHOTODIODE DETECTORS
Scientech does not recommend that Scientech photodiode detectors be used without a H410 power meter.
The crystals used in the detectors are wavelength dependent and the absorption characteristics vary from
batch to batch as they are manufactured. The H410 power meter’s software contains the correction factors
necessary to get accurate readings.
Cable Requirements
Photodiode detectors are powered up by the power meter. To use a photodiode detector without a
Scientech power meter you must construct a cable as described on page 30 and shown in Figure 6.
Operation of Scientech Photodiode Detectors with a Digital Volt Meter
The detectors may be used with any digital volt meter (DVM) capable of reading 5 volts full scale only at
the 632 nm wavelength. For use at any wavelength other than 632 nm you must contact Scientech to
determine the correct sensitivity for that wavelength.
A. Connect the output of the detector to the DVM.
B. Select the DC volts mode.
C. Direct the laser beam on to the absorbing surface of the detector.
D. When the display of the DVM has stabilized calculate the laser power using the formula:
W = V/S
where:
W = Laser power in watts
V = Voltage reading of the DVM in volts
S = Sensitivity of the calorimeter from page 2.
SCIENTECH CALIBRATION SERVICE
Scientech recommends that a complete calibration be performed annually to verify system accuracy.
Please visit Scientech’s website at www.scientechinc.com to obtain an RMA (returned material
authorization) number and complete the form noting that you are requesting calibration of your detector.
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