1.3 Glossary
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1.3 Glossary
This section explains the technical terms used in this manual.
External Trigger
This function synchronizes measurement of waveform data points with
input triggers pulses. It is used when measuring modulated light. For an
explanation of the external trigger, refer to 4.7 “Changing Measurement
Mode”.
Accuracy
Displayed measured values include some errors and the wavelength and
level displayed by MS9740B also include errors. The maximum error
guaranteed for the MS9740B used under fixed conditions is called the
accuracy.
Calibration
To minimize errors, the MS9740B has a calibration function that adjusts
the internal optical systems using a light source with a known
wavelength and level by subtracting the difference between the
calibration value and the measured value. For an explanation of
calibration, refer to 3.1 “Calibrating Before Measurement” and 7.1.
“Calibration”.
Sweep Speed Time
Sweep time is the time required to start measurement and write the
results to the screen. The sweep time of the MS9740B depends on the
measurement conditions such as the Rx bandwidth, number of averaging
as well as on the waveform shape.
Video Band Width (VBW)
VBW (Video Band Width) is the bandwidth of the internal received
amplifier.
Narrowing the VBW helps suppress noise in measurements.
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