Anritsu MS9740B - Page 278

Chapter 7 Performance Test and Maintenance
7-18
Table 7.8-1 Check Item (Cont'd)
Phenomenon Possible cause Action
Incorrect measured
spectrum waveform
Incorrect resolution
Set a small resolution for light sources with a
narrow spectrum like LDs.
Too many smoothing points
Set smoothing to Off or reduce the number of
smoothing points
Displaying memory
calculation
Set the trace display to Wri.
MM Mode set to On
Set MM Mode to Off.
Incorrect measured
spectrum wavelength
Wavelength not calibrated
Calibrate as described in 3.1 “Calibrating
Before Measurement”.
Wavelength display in
air/vacuum incorrect
Set the desired wavelength display.
Low measured
spectrum level
Fiber cord or optical
connector dirty
Clean as described in 7.4 “Optical
Connector/Optical Adapter Cleaning”.
SM fiber connected instead of
MM fiber
Use MM fiber for light sources requiring MM
fiber.
Fiber cord damaged or under
excessive tension, etc.
Do not bend the fiber cord or put heavy
objects on it.
Fiber cord not inserted into
connector correctly
Insert the fiber cord into the connector
correctly.
Noisy optical
waveform at low level
measurement
Wide Rx optical bandwidth
Set a narrower Rx bandwidth.
Resolution too narrow for
wideband spectrum light
source such as LD
Set an appropriate resolution
ATT set to On
Set ATT to Off.
Peak point not found
by Peak Search
Peak point outside zone
markers
Set the zone markers to Off or move the peak
point into the range of the zone markers.
Analysis processing
not executed for entire
waveform
Zone markers set
Set the zone markers to Off or change Zone
Center so that the part to be analyzed is
between the zone markers.
Analysis cut or slice level too
small
Set the cut or slice level to include the range
to be analyzed.
Measurement data
not saved
Storage device
write-protected
Remove the write protection.
Storage device full
Change the storage device or delete some
files.
Destination folder set to read
only
Change the folder properties.