Agilent Technologies N4373A User Manual page 131

Specifications and Regulatory Information
130
results in the table. The results should be lower than the
corresponding specification.
31 Recall the file oeDark. Export the S
magnitude format. Divide the frequency range of the trace
into 10 segments. For each segment, calculate the average
signal level. Then convert these 10 numbers to electrical
dB with the formula 20log(x). These values now represent
the optical- to- electrical minimum measurable
responsivity vs. frequency. Depending on the NWA option
of the LCA, this parameter is specified separately above
and below a particular frequency. Determine the highest
level of dark signal in these two frequency ranges and
record the results in the table. The results should be
lower than the corresponding specification.
32 Recall the file eoDark. Export the S
magnitude format. Divide the frequency range of the trace
into 10 segments. For each segment, calculate the average
signal level. Then convert these 10 numbers to electrical
dB with the formula 20log(x). These values now represent
the electrical- to- optical minimum measurable
responsivity vs. frequency. Depending on the NWA option
of the LCA, this parameter is specified separately above
and below a particular frequency. Determine the highest
level of dark signal in these two frequency ranges and
record the results in the table. The results should be
lower than the corresponding specification.
33 Recall the file ooIntRec (or ooIntRec1600 for Options
#302 or 303). Determine the midpoint "AvgResp_O/O" of
the trace as the average of the maximum and minimum
value of the trace. Then use this value to offset the
ooIntRec trace so that it is centered at 0 dB, according to
RelResp_O/O(f) = ooIntRec(f) – AvgResp_O/O. Check
the vertical range of this trace against the specified
accuracy for optical- to- optical system relative frequency
response uncertainty and record this range in the table.
34 Recall the file oeRefRec and determine its offset from the
calibration data of the reference receiver as:
∆Resp_O/E(f) = oeRefRec(f) – Resp_Ref(f). Determine
the midpoint AvgResp_O/E of the trace ∆Resp_O/E(f) as
the average of the maximum and minimum value of the
trace. Then use this value to offset the ∆Resp_O/E(f)
trace so that it is centered at 0 dB, according to:
RelResp_O/E(f) = ∆Resp_O/E(f) – AvgResp_O/E. Check
the vertical range of this trace against the specified
accuracy for optical- to- electrical system relative
Agilent N4373A Lightwave Component Analyzer, First Edition
Introduction
trace in linear
21
trace in linear
21