HP 83481A, User Manual, Page: 64 / 98

Calibration Overview
User Calibrations|Optical and Electrical
T o perform a plug-in
module vertical
calibration
1. Remove any front-panel connections from electrical channels .
2. Cover the optical inputs for the optical channels .
3.
Press 4 Utilit y 5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Calibrate. . . , and then
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Calibrate plug-in. . . .
4.
Select the plug-in module to be calibrated, press
NNNNNNNNNNNNNNNNNNNNNNN
1 and 2 or
NNNNNNNNNNNNNNNNNNNNNNN
3 and 4 .
5.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Start cal to start the calibration.
6. F ollow the on-screen instructions .
No additional equipment is required to perform a plug-in vertical calibration.
Reference signals are both generated and routed internally , for the optical and
electrical channels . If you are prompted to connect the calibrator output to
the electrical channel during an optical vertical calibration, then the factory
O/E calibration has been lost. The module must then be returned to HP for
calibration.
Oset Zero Calibration
The oset zero calibration performs a quick oset calibration on the optical
channel for optical measurements . Since the primary source of calibration
error on the optical channel is oset drift, this function is useful between
the plug-in module vertical calibrations if the plug-in module has not been
removed or reinstalled and the operating temperature has not changed more
than 65 C. In order to ensure that instrument specications are met, perform
the plug-in vertical calibration.
P erforming an oset zero calibration is much faster than performing a
complete vertical calibration. F or critical measurements where oset
measurement uncertainty is important to consider , perform an oset zero
calibration between module vertical calibrations . P erform an oset zero
calibration if the vertical scale or oset changes .
3-12