xiv
Detector Signals and Calculations:
S
Represents the most recent signal value ob-
tained from the A/D converter. It may represent
amps or volts and may be analog and or digitally
filtered.
S
d
Represents the value stored as a reference signal
for subsequent use in signal offset, i.e. ZERO
calculations. S
d
=0 when ZERO is off.
S – S
d
Represents the most recent net signal value.
This is the value that is displayed when units are
set to Amps or Volts. Note that Sd = 0 when
ZERO is off.
Measurement calculation when the display units
are Watts or Joules. R
λ
is the detector
responsivity associated with the current wave-
length setting.
Measurement calculation when the display
units are ten times the (base ten) logarithm of the
ratio of the measured power to 1 mW, i.e. dBm.
Measurement calculation when the display units
are the ratio of measured power to the value
stored by the STO-REF function.
Measurement calculation when the display units
are ten times the (base ten) logarithm of the
ratio of measured power to the value stored by
the STO-REF function.
S
S
R
d
−
(
)
λ
10
1
log
/
S
S
R
d
−
(
)
λ
mW
S
S
R
d
−
(
)
/
λ
STO-REF
10 log
/
S
S
R
d
−
(
)
λ
STO-REF
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