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6-4
Test 1. Absolute Wavelength Accuracy
Test 1. Absolute Wavelength Accuracy
Description
C A U T I O N
Procedure
Wavelength accuracy is verified using traceable light
sources based on a physical constant such as a
1523.488 nm HeNe gas laser (196.7804 THz).
Do not exceed +18 dBm source power. The input
circuitry of the Agilent 86121A can be damaged when
total input power exceeds 18 dBm.
1 Connect the output of the fiber coupled 1523 nm HeNe
laser to the OPTICAL INPUT of the Agilent 86121A.
2 Turn on the HeNe and allow the laser to warm up for
15 minutes.
3 On the font panel of the Agilent 86121A press the Preset
key. Press MORE, UNITS, WL, and then THZ.
4 Read the frequency measured on the Agilent 86121A,
and compare it to the specification listed in
"Specifications and Regulatory
Chapter 7,
Information".
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