28 (53) BRUKER BIOSPIN Operating & Service Manual Version 002
Technical Description
• Forward pulse width
Figure 5.5. Forward Pulse Width Limitation
The pulse width is the lapse of time during which the nominal power can be
applied.
Limitation range : from 0.1ms to 512ms.
The pulse width value is updated every 100µs.
• Forward pulse duty cycle
The duty cycle value is the ratio between measured input power during
pulse width limitation value divided by duty cycle limitation value and the
nominal power during the same time.
For example, if the pulse width limitation is set to 3ms and duty cycle is
limited to 10%, then duty cycle value equals the measured input power
during 30ms (3ms / 0.1) divided by the nominal power during 30ms.
Limitation range : from 1% to 100%.
The duty cycle value is updated every 100µs.
• Excess of reflected power (Mismatch)
The mismatch value is the ratio between the reflected power value and the
forward power value.
Limitation range : from 1% to 100%.
The mismatch value is updated every 100µs.
• Other protections
The control board also detects the following faults :
- Power supply fault
- Fan failure
- Heat sink temperature to protect against thermal overstress
- Fault detection timings
FORW. RF SHAPE
PW LIMIT
IF POWER > 100% NOMINAL POWER THEN FAULT DETECTION
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