Teledyne LeCroy OE695G - Manual (Page 12)

OE695G Optical-to-Electrical Converter
6 922562-00 Rev A
Channel Dialog
When the OE695G is connected to a particular channel, the respective Channel
dialog will change to reflect the connection of the device:

An OE695G tab for controlling the converter is added to the Channel
dialog (Figure 1)

Gain settings are adjusted and vertical scale labels automatically change
to µW/div units

Coupling, bandwidth limit (BWL), and other selections are prohibited
since they must be preset to certain values to allow proper functioning
of the OE695G.
Figure 1 shows the oscilloscope user interface menu for the OE695G converter.
The dialog allows for the selection of the converter’s Dark Calibration, Reference
Receiver selection and Optical Wavelength selection functions.
Figure 1: OE695G tab of the oscilloscope’s Channel dialog.
Dark Calibration
The OE695G incorporates a Dark Calibration function to measure the channel
offset signal without any light present in the optical receiver.
To perform dark calibration, cover the OE695G input with the supplied cap, and
press the Dark Calibration button on the OE695G dialog. A scale factor value will
be calculated and displayed.
Dark calibration will vary with internal OE695G temperature (the dark calibration
level variation with temperature is -2 μW/ ºC typical), so if the device
temperature varies considerably, additional dark calibrations may be required.
After a dark calibration is performed, the temperature it was performed at will
be displayed in the Attributes section of the OE695G dialog, to the right.
Touch Set to Zero to reset the Dark Calibration value to zero.