Bruker BLAH500 E, Руководство по эксплуатации и обслуживанию

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Operating & Service Manual Version 002 BRUKER BIOSPIN 25 (51)
Theory of Operation
BLA Control Board 5.2.2
The BLA Control Board has 3 main functions:
1. Conditions the input blanking (BLNK) signal and delivers it to the above
mentioned RF Paths.
2. Allows Ethernet communication with the workstation.
3. Monitor the output characteristics of the amplifier thanks to the DC peak
detection of the bi-directional coupler.
Electronic circuitry processes the detection information and protect the
amplifier from overstress like :
•
Forward and reflected peak power
Figure 5.4. Peak Power Limitation
The peak power limitation is the maximum RF forward shape amplitude
allowed at the amplifier output.
Limitation range : from 1% to 200% of nominal power.
The peak power limitation is checked for each sample (10 million samples
per second), and the maximum peak value is latched then cleared by a
read operation (for monitoring purpose).
•
Forward pulse width
Figure 5.5. Forward Pulse Width Limitation
MAX. RF SHAPE AMPLITUDE
FORW. OR REFL.
RF SHAPE
FORW. RF SHAPE
PW LIMIT
IF POWER > 100% NOMINAL POWER THEN FAULT DETECTION