LightWave Systems Microwave Oven Silicon Power / Wavehead User Manual download pdf (Page 40)

TROUBLESHOOTING

Troubleshooting Guide

24 OMH-6722B

CHAPTER 5



Symptom Causes and Corrective Actions

Measurement will not

stabilize

• The OMH-6722B is designed to accurately measure the

wavelengthofaCWsourcewithanamplitudeinstabilityofupto

40% depth of modulation. Ensure the laser source’s wavelength is

stable and that any modulation is minimized. This condition may

occur if the laser has not warmed up. Most gas laser cavities

expand when first turned on which can cause intensity and

wavelength fluctuations.

• Check for tight connections between the main unit and the 6722B

and ensure other “noisy” electronic devices are not located near

the Optical Measurement Head.

• In cases of low input power and/or high background light, try

working in a dark environment and be sure to zero the instrument

as described in Chapter 2.

Display shows "-----"

• The 6722B is not connected to the main unit.

Display shows "HI-P"

• This condition occurs when the laser’s input power exceeds the

maximum allowed for the selected gain range. Measurements at

this level are invalid. If in manual mode, press the DOWN switch

to select the next lower gain range.

Display shows “HI-

λ"

• This condition occurs when the instrument interprets the laser’s

wavelength as greater than 1100 nm which is beyond the

capability of the OMH-6722B.

Display shows “LO-

λ"

• This condition occurs when the instrument interprets the laser’s

wavelength as less than 400 nm which is beyond the capability of

the OMH-6722B.

Measurements are not

accurate at a known

wavelength or power

standard

• Be certain the zeroing procedure has been performed correctly.

• It may be necessary to perform the User Calibration.

• The source may be too close to the WaveHead and is emitting

non-lasing radiation into the aperture.

Measurement seems erratic

with a pulsed source input

• Change update rates. Best results with pulsed sources are usually

in the SLOW update rate.

• Work in MANUAL gain ranging mode; the AUTORANGING

algorithm may have difficulty with some pulsed sources, especially

those with duty cycles less than 50%.

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LightWave Systems Microwave Oven Silicon Power / Wavehead User Manual Page 40

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