L-TRX/L-19F
H172203_1_001 117 / 234
Over Temperature Error
In case of power amplifier or board over temperature all operations are temporarily sus-
pended and the L-TRX enters the ERROR state. An error message is sent to TopSpin. When
the over temperature condition is past the L-TRX reverts to the operating mode prior to the
error.
Error message examples:
• L-TRX interrupt: L-TRX Amplifier overtemperature error occurred.
• ELCB periodic monitoring: L-TRX Temperature TempPA out of range Value:
76°C Limits: 0 °C/75 °C.
In case of an error do as follows:
• Check that no 2H Observe or Decouple experiment is running with the internal power
amplifier. The internal power amplifier can only be used for gradient shimming.
• Check that the maximum duty cycle and pulse length specifications are not violated. See
Technical Data BSMS/2 Lock Transceiver [}99].
Over Current Error
If the power amplifier drain current exceeds the limit of safe operation it is switched off and
the L-TRX enters the ERROR state. An error message is sent to TopSpin.
• Reboot L-TRX to clear error state.
• The 2H-TR output (J9) of the L-TRX must be connected to a load (max. mismatch see
Technical Data BSMS/2 Lock Transceiver [}99]). Check wiring and load (i.e. 2H
Amplifier). To avoid this error try to improve the matching of the 2H coil of your probe.
• Repeat your experiment.
• If the error remains it is a hardware failure. Contact your local Bruker service
representative.
Duty Cycle Error and Pulse Length Error
If the power amplifier is operated over its specification in terms of maximal duty cycle or the
maximal pulse length the L-TRX board issues an error and deactivates the power amplifier
stage. The power amplifier is reactivated after the blanking signal has been deasserted and
the measured duty cycle is within specification.
The BSMS system will report an error with the following message:
“L-TRX 2H Amplifier: RF Pulse Length or Duty Cycle violation! Please check your Pulse
Program.”
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General