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You can restart the drift measurement at any time by pressing the
RESET softkey. All minimum and maximum values are reset to the ref-
erence values, and the Agilent 86120C begins to monitor drift from the
current laser line values. Move the cursor up and down the listing to
see the reference wavelength and power of each laser line.
If measurement updating stops or the values become blanked
If, in the middle of a measurement, the number of laser lines present changes, the
measurement stops until the original number of lines returns. You'll notice that a
CLEAR softkey appears and one of the following message is displayed:
E46 NUM LINES < NUM REFS
E47 NUM LINES > NUM REFS
To view the data measured before the conditions changed, press CLEAR and
then MAX-MIN. Notice that the measurement acquisition is changed from con-
tinuous to single.
To restart testing, press CLEAR, the CONT key, and then RESET to use the new
number of lines as the reference. Pressing CONT restarts continuous measure-
ment acquisition. Or, you can restore the original number of lines on the input
so that the drift measurement can continue.
To measure drift
1 Press the front- panel Preset key.
2 Press Peak WL, List by WL, or List by Power to select the display style for
observing drift.
3 Press Appl's and then DRIFT.
Pressing DRIFT sets the current laser- line values as the reference from
which to compare all drift.
4 Press MAX-MIN for the desired type of drift measurement as described
in the following paragraphs:
Display shows the current values of laser lines relative to the
wavelength and power values measured when the test was
begun or the RESET softkey was pressed.
Display shows absolute maximum values since the drift
measurement was started. This measurement gives the longest
wavelength and greatest power measured. The laser line of
interest may have since drifted to a lesser value. Note that the
Making Measurements
Measuring Laser Drift
2-23
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