Agilent 81623A Ge Optical Head
5mm
Diameter
The analog output is the BNC connector on
the back of the
optical head. It outputs a voltage directly
proportional to the
strength of the optical signal at the
optical input in the current
range. The analog signal is always in the
range between 0 and
2V, 2V corresponding to a full power input
signal in the current
range, 0V corresponding to no input signal.
During autoranging, the level to which 2V
corresponds changes.
You should disable autoranging when using
the analog output.
Disabling Autoranging
Applications
Possible applications for the analog output
are:
? to close the feedback loop controlling
the current supplied to
a laser
? to aid positioning the system for fiber
alignment tasks
? to monitor optical power on an
oscilloscope
The analog signal reacts instantaneously to
the input signal,
whereas the power shown on the display is
subject to averaging.