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Measurements Applications
Measuring Laser Drift
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 maximum wavelength and maximum
power may not have occurred simultaneously.
Display shows absolute minimum values since the drift
measurement was started. This measurement gives the
shortest
wavelength and
smallest
power measured. The
If measurement updating stops or the values become blanked
If, in the middle of a measurement, the number of laser lines present changes, the mea-
surement stops until the original number of lines returns. You’ll notice that a
CLEAR
soft-
key 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 continuous 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 measurement acquisition. Or,
you can restore the original number of lines on the input so that the drift measurement
can continue.