displayed value
is
the function
10
log (DID,). D,
is
always a power reading
stored in the units of Watts. Press ST0 REF to cause a new D, to overwrite the
existing
D,
value.
NOTE
When not using remote interface operation and when displaying relative dB
or REL measurements with the stored reference selected, the message
display area will show the ST0 REF value used in the calculation.
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
V,
A
to
select a new reference source. The choices will be:
ST0 REF
-
The last stored measurement
USR REF
-
User defined reference
(see
the USRREF command in Section
5.3
Device Dependent Commands)
CH A@) -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 available then N/A will appear next to CH A@) and you
will not be able to select it.
2.3.10
A,
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
A
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
V,
A
to adjust the blinking digit up or
down and
4,)
to change which digit blinks. Press the ENTER a second time
to accept the new wavelength and exit the wavelength edit/display mode.
Press
h
or ESC to exit without changing the wavelength.
2.3.1
1
RANGE,
Signal
Range
RANGE key allows the user to view the amplifier signal range. Signal ranges
step in
1
decade gain increments in order to utilize maximum resolution from
the meter's analog-to-digital converters. The available signal ranges are
detector dependent. 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.
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