9
2.3.9
REF SEL, Select Reference
The REF SEL key is used to select the reference value, Dref, to be used for
relative, REL, and logarithmic relative, dB, unit readings. Press the REF SEL
key to display the reference source in the message display area. The EDIT
annunciator will be lit and the current selection will blink. Press
, to
select a new reference source. The choices will be:
STO REF - The last stored measurement
USR REF - User defined reference (see the USRREF command in Section 5.3
Device Dependent Commands)
CH A(B) - The other channel
Press ENTER to accept the new reference source and exit the select reference
mode. Press REF SEL or ESC to exit without changing the reference source.
NOTE
The CH A(B) source is only applicable if the other channel is available. If the
other channel is not availble then N/A will appear next to CH A(B) and you
will not be able to select it.
2.3.10
λ
, Wavelength
A detector calibration module contains responsivity data for its assigned
detector at discrete wavelengths. By telling the meter which wavelength is
being measured, the correct responsivity value is used in calculating the
measured power or energy. When a wavelength falls between two calibration
points, linear interpolation is used to approximate the true responsivity value.
Press the
λ
key to display the measurement wavelength in the message
display area. Press ENTER to light the EDIT annunciator and cause the last
digit of the wavelength to blink. Press
, to adjust the blinking digit up or
down and , to change which digit blinks. Press the ENTER a second time
to accept the new wavelength and exit the wavelength edit/display mode.
Press
λ
or ESC to exit without changing the wavelength.
2.3.11 RANGE, Signal Range
RANGE key allows the user to view the amplifier signal range. Signal ranges
step in 1 or 1/2 decade gain increments (MODE dependent) as the RANGE is
changed in order to utilize maximum resolution from the meter’s analog-to-
digital converters. The available signal ranges are detector and mode depen-
dent. Press RANGE to display the signal range number in the message display
area. If AUTO is on, then the signal range number will change if the detector signal
varies more than a decade in magnitude. Signal range changes can occur without
an effect on the displayed measurement value. Press RANGE a second time to exit
the signal range display mode.
Press the
, arrow keys to increase or decrease the signal range. If AUTO
is on, pressing the
, arrow keys will disable AUTO and cause the signal
range to change. Manual ranging is useful when working with external analog
recording equipment.
NOTE
Pressing the
, arrow keys will disable AUTO ranging and change the signal
range even when the signal range is not being displayed via the RANGE key.
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