Advantest BLQ-015668 Over Current PCB Circuit Board
Quite a few of the old meters also have a relay power saving mode not working right
that can cause some thermal EMF error that can effect the lower voltage ranges – this is fixable at least.
The 6581T tends to have a rather poor factory calibration that causes quite some INL error
– so while the ADC is essentially the same as with the full version, the linearity is not that great for the T version.
There may be ways to correct this, but it is extra effort and may need extra instruments (e.g. cal source).
Displayable optical frequency
In addition to the normal wavelength display mode, the measurement spectrum can also display the optical frequency.
Since light in terahertz units can be read directly, this is useful for measuring optical wavelength
division multiplexing and chirping from LDs, as well as for analyzing Soliton transmission systems.
Coherence analysis of ±165 mm
Because the Q8347 uses a Michelson interferometer, the system is capable of performing coherence analysis.
This feature makes it easy to evaluate the noise rejection performance of a disc LD. In addition,
the travel of the interferometer can be greatly increased to allow analysis over a range of ±165 mm.
As a result, more detailed analysis can be performed in addition to the conventional secondary maximum peak (α value).
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