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Advantest BLQ-015668 Over Current PCB Circuit Board
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Advantest BLQ-015668 Over Current PCB Circuit Board

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Weight:0.000KG
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Feature

The advantage of the old 6581 is that there is a reverse enginered schematics available, if needed for a repair. 

As a downside the displays are often dim and a replacement is a bit tricky.

A know weak point for the 6581 is the rather large current spike from AZ switching - this can be an issue with some signal sources. 

Another point is that ACAL may not be fully accurate for the highest resistor ranges. 

So the specs there may be a bit overly optimistic. 

Key Features

- Sensitivity -92 dBm

- Polarization correlation ±0.05 dB

- Resolution bandwidth accuracy ±2

- Power Measurement

- Pulsed light measurement

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).

Curve fitting function

The Q8347 offers sech2 and Gaussian function curve fitting. Therefore, it can be used for spectral analysis of soliton transmission systems.

List display

The peaks of spectrum or coherence data can be displayed as digital data containing up to 200 points.

The separation and level of each channel of an optical WDM transmission system can be seen at a glance.

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