Zero - ILX Lightwave FPM-8200 User Manual

To save a setup mode:
1
2
3
To recall a setup mode:
1
2
3
If you do not press SAVE or RECALL within the three seconds of number display,
the operation is aborted and the FPM-8200 returns to its previous state.

Zero

ZERO applies an offset to internal amplifiers that eliminates detectable fixed
errors. These errors can be from internal effects such as detector dark current, as
well as from external effects such as ambient light. Before any measurement, it is
good practice to first zero the meter. The concept is similar to shorting the leads of
a voltmeter and making sure the meter reads zero.
To zero the FPM-8200:
1
2
01_10
Press SAVE to display a memory number for three seconds.
Before the number display turns-off, press UP or DOWN to change the number as
needed.
When the desired memory number is displayed, press SAVE again.
Press RECALL to display a memory number for three seconds.
Before the number display turns-off, press UP or DOWN to change the number as
needed.
When the desired memory number is displayed, press RECALL again.
Make sure your fiber or connector is in place at the detector input and the light source is
off.
Press ZERO. The process takes about ten seconds. During the zero process, the ZERO
indicator blinks and the number 0 moves across the display. When the process is
complete the display shows "-LO-".
If you press ZERO before the process completes, it stops the process with no change to
the zero offset.
Note: The best results are obtained by minimizing external influences, because they are
rarely stable. For this reason, the FPM-8200 limits the amount of acceptable zero offset.
Error E-531 indicates there is too much ambient light for a reliable zeroing.
FR O N T PA N E L O P E R A T I O N
The FPM-8200 Front Panel
2
C H A P T E R
9
FPM-8200
