34
Getting Started
Selecting the Wavelengt h Calibration and Its Function
• to reposition the filter so that the attenuation stays constant, or
• to change the attenuation factor on the display to show the
wavelength dependence. You use this to set the wavelength for
an unknown source (you alter the wavelength until the displayed
attenuation matches the measur ed attenu ation).
To set the fu nction of the calibration data press SYST repeatedly
until LAMBDCAL is shown at the bottom o f the display. Set
LAMBDCAL to OFF to use the calibration data to repositio n the
filter, and set LAMBDCAL to ON to use the calibration data to
change the attenuation factor.
As well as the wavelength calibration data measured for and stored
in your instrumen t in the factory, there is space reserved in memor y
for a set of your own user calibration data. (You load this data int o
the instrument over the GPIB. See “User Calibration Commands”
on page 123)
Press SYST repeatedly until USERCAL is shown at the bottom of the
display. OFF selects the factory-made wavelength calibration data.
ON selects the user wavelength calibration data.