Advantest R6740B Voltage Sources Power Supplies
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).
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.
Key Features
– Sensitivity -92 dBm
– Polarization correlation ±0.05 dB
– Resolution bandwidth accuracy ±2
– Power Measurement
– Pulsed light measurement
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.
A standard internal disk drive is used as a storage medium. Stored binary data can be analyzed with the appropriate program under MS-Windows or copied to a file and printed out.
The high-speed built-in thermal printer prints out a hard copy of the measurement results with all setup parameters in less than 10 seconds. The built-in high-speed thermal printer prints a hard copy of the measurement results with all setup parameters in less than 8 seconds.
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