Burleigh WAVEMETER JR WA-2500, Operating Manual, Page: 27 / 47

Wavemeter
jr
Operating Manual 4. Maintenance and Service
Burleigh Instruments, Inc. (04659-M-00 Rev E) page 4-3
Burleigh Park, Fishers, NY 14453
4.2 TROUBLESHOOTING
Symptom Corrective Procedure.
Blown fuse Check 115/230 VAC selector switch. Replace fuse. If fuse
blows again, disconnect transformer from main circuit board
at P1 and try new fuse to determine if transformer is bad.
No display Check fuse. Check display panel is connected to main circuit
board at P3. Verify low voltage power supply is good. The red
LED on the circuit board should be lit and the test point
voltages relative to the GND test point (TP6) should be:
TP1 = + 5 volts
TP2 = + 12 volts
TP3 = - 12 volts
TP4 = + 5 volts
Display is very
weak Check 115/230 VAC selector switch. 5 volts at TP4.
VIS/IR on rear
panel not lit. Check that Detector Board connector is attached.
ALI Er Realign interferometer (refer to Section 3.11).
HI SIG but bar-
graph not fully
lit. Check MONITOR signal character for extreme amplitude
variations or laser instability. Realign interferometer (Refer
to Section 3.11).
PLL Er Check that the Moiré gauge signal at TP5 exceeds 2 volts
peak-to-peak throughout the TRIGGER interval. Verify that
the interferometer scan assembly swings freely without
touching other components, approximately 9 mm travel.
Display is
frozen on zero
after power up. Check that the solenoid releases the scan mechanism on
power up. The solenoid is located below the interferometer.
Verify that the interferometer scan assembly swings freely
without touching other components, approximately 9 mm
travel.
LO SIG
displayed for
input power of
several
milliwatts Check the beam receiver alignment. (Section 3.3.) Check the
fiber optic cable for damage, or dirt on the ends, that might
reduce its transmission. Check interferometer alignment
(Section 3.11). Check that the Detector Board jumper is set
correctly for the VIS or IR detector (Section 3.12).
Displayed value
changes
erratically Reflection from the beam receiver is destabilizing the laser.
Check the MONITOR signal and slightly misalign the beam
receiver. Laser stability may also be affected by feedback
from other optical components in the beam.
Displayed value
is incorrect Calibration error. See Section 3.7 to recalibrate. Noise on the
laser input is interpreted as part of the fringe signal. As you
view the MONITOR signal, reduce the input power until the
amplitude noise following the fringe envelope is less than 0.5
volts peak-to-peak.
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