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Appendix F. Error Messages
Display Messages
Display Messages
Light A?, Light B?, Light A & B?
An attempt was made to zero the optical heads without shielding
them completely from light.
Do one of the following:
• Screw the protection caps onto the heads.
• Interrupt the signal path to the heads (e. g. by turning the source
off).
After that press
No Head A, No Head B, No Heads
This message is displayed, if there is no head attached to the
instrument. Or, if there is only one head attached to the instrument
and you activate the non-existent head. It also appears, if only one
head is connected and you start the applications Coupler Test or PD
Coupler Test, respectively.
P < P par ?
You may encounter this message when measuring Return Loss. It
appears whenever the optical power which is currently received
remains under the stored value of the power of parasitic reflections.
Zero the heads.
Switch the source on. The source indicator lamp must be lit.
Follow the calibration procedure described in section 3.2
"Measuring the Return Loss" on page 58: First store the power
reflected from the open end of the optical output as P ref. Then
remove the reflection from the open fiber end and store the
remaining power as P par. P par should be below –50 dBm.
After that attach your device under test.
243
Z
again.
ERO
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