Advantest BLB-025841 Circuit Board PCB PLB-420972BB2 M4542

Operation

In addition to amplifier analysis, a variety of display modes are available, such as

- Overlay display,

- Comparison with memory contents,

- Display of two independent graphs (split screen),

- Power meter function,

- Use of multiple markers,

- Normalized and direct readout of transmission loss and

- Automatic bandwidth analysis (e.g. measurement of half-value widths based on RMS and envelope methods),

- Curve fitting over the IEC/IEEE bus and many other features facilitate operation of the analyzer and simplify analysis.

Internal or external triggering is possible.

Measurement time is 0.8 seconds for a span of 200 nm and varies with the span.

Broadband light sources with a resolution of 5 nm have the highest sensitivity, 

while narrowband light sources (lasers) can be reliably analyzed down to the noise level even with a narrow resolution bandwidth.

The normalization function combined with the white light source allows direct measurement of transmission and loss characteristics of filters and fibers.

Generation : PHS, PDC, IS-136. GSM, DECT, EDGE, GPRS IS-95. W-CDMA/3GPP, cdma2000. Bluetooth

The Advantest R3267 spectrum analyzers provide accurate, repeatable measurements of high-quality 

digital signals in the 2GHz band ± within 1% frequency span accuracy and -154dBc/Hz dynamic range (typical).

Key Features

- Sensitivity -92 dBm

- Polarization correlation ±0.05 dB

- Resolution bandwidth accuracy ±2

- Power Measurement

- Pulsed light measurement

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. 

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).

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