Gentec-EO HP - Manual (Page 16)

Version 2.2
12
HP Series Instruction Manual Gentec Electro-Optics Inc. All rights reserved
2.2.3.3 Display - Status
FIG. 2-9 PC-HP SETTINGS WINDOW
The Settings window displays various settings.
2.2.3.3.1 Status - Wavelength
Use The Wavelength menu to select the power wavelength at which the detector is to be used. It
applies a correction to adjust for the variation in responsivity at different wavelengths. When a
new thermal detector is plugged in, the calibration wavelength is the default selection.
PC-
HP only allows you to choose values that fall within the detector’s range. If you select or
enter a value that is not valid, a menu pops up to signal the error and PC-HP automatically
selects the default value. That is the wavelength used for calibration at Gentec-EO during
manufacture or subsequent service.
The HP automatically recognizes every power detector, for accurate auto-calibration. More
importantly, it takes advantage of our Personal wavelength correction
™: it reads the memory in
the Smart Interface connector to provide a wavelength correction based on spectral data
measured from that specific detector. Your measurements across the band have never been this
precise and easy.
When working at a wavelength not available in the Wavelength menu, use the custom option. If
you choose custom, a dialog box appears where you can enter a wavelength. The wavelength
you enter must be within the range of valid wavelengths. The HP interpolates a wavelength
correction factor using the pre-
programmed data in the detector’s EEPROM.
2.2.3.3.2 Status - Corrections
The user can apply one multiplier and one offset to the detector reading. Correction factors are
most useful when sampling a percentage of a powerful laser beam or correcting for absorption
along an optical chain. The Status window displays the values of correction factors that are being
applied to the measurements. To activate the correction factor, select Status in the Display Menu
and then select Multiplier or Offset. A dialog box opens where you enter the correction value in
percentage or as an absolute value. This number will then multiply, or add to the actual
measured value to calculate the corrected value. PC-HP will then display the corrected value.
Note that the Statistics are computed for the corrected values only.
To disable the correction factor, do a Display – Status – 1 & 0.
2.2.3.3.3 Status - Anticipation
Thermal power detectors are inherently slow. The HP uses an algorithm to significantly
accelerate the response. This is called “anticipation”. By default, this option is enabled. The
reasons for disabling the anticipation are to slow down the response and to lower the noise level.