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Changing the Units and Measurement Rate
Displayed units
Measurement rate
Displayed units 3-7
Measurement rate 3-7
To change the units of measure
1 Press Setup.
2 Press the MORE softkey.
3 Press the WL UNIT softkey.
4 Select one of the following units. Then, press RETURN to
complete your selection:
• NM for nanometers
• THZ for terahertz
Under normal operation, the Agilent 86121A makes a
measurement and displays the results about once every
second. It is in this normal update mode that maximum
accuracy and wavelength resolution are achieved. How-
ever, should a faster update be desired, for example
when real-time feedback is required to tune a laser to
its designated channel, the 86121A can be set to update
approximately two times per second. This reduces both
wavelength resolution and accuracy but can be benefi-
cial in some applications.
The instrument resolution in NORMAL update mode is
7 GHz (0.06 nm at 1550 nm). This resolution is useful
when measuring closely spaced laser lines carrying data
at up to 5 Gb/s rates.
The instrument resolution in FAST update mode is
14 GHz (0.12 nm at 1550 nm). This resolution is useful
when measuring laser lines carrying data at up to
10 Gb/s rates.
Changing the Units and Measurement Rate
3-7
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