Protection Circuits; Over Heat Protection; Input Protection; Power Supply Faults - Ametek Teseo CBA Series Operation Manual

If you do not need this function, fit the supplied BNC shorting-link in place. Failure to
do this will result in the amplifier latching in an "Interlock Open" status which switches
the amplifier into standby mode.
4

PROTECTION CIRCUITS

4.1

Over Heat Protection

The CBA RF components produce heat and are air cooled by fans. Should an over
heat condition occur for any reason, the CBA contains heat sensors that will shut
down the system via the amplifier control system. If the inlet and outlet openings are
obstructed, clear the obstruction and allow the amplifier to remain in standby so that
the internal fans can cool the amplifier down. Once the amplifier has reached an
acceptable temperature, depress the "Fault Reset" soft key on the touchscreen and
the amplifier will operate normally.
4.2

Input Protection

The CBA series is designed to achieve the specified output power level (see
applicable datasheet) for an input level of 0 dBm or less (1.0mW) however, to prevent
overdriving the amplifier, the Input Protection circuit will activate if the input signal
exceeds 10 dBm and will automatically compensate for the increased input signal by
reducing the gain of the preamplifier. Even though the amplifier has an Input
Protection Circuit, overdriving the amplifier is not recommended.
IMPORTANT NOTE:
The CBA Sample Port connectors must be either connected to a 50Ω measurement
system or terminated with the supplied 50Ω load. If the CBA is operated without 50Ω
impedance on the Sample ports, the metering and output protection may be
inaccurate, which may result in damaging the amplifier and voiding the unit's warranty.
4.3

Power Supply Faults

The Power Supply Fault circuit monitors the voltage and current of system power
supplies and produces a fault indication should any voltage or current level deviate
from normal operating parameters. Each power supply voltage output is monitored
and displayed to indicate the power supplies are operating within design parameters.
4.4

Mismatch Protection

The amplifier is not damaged by using it into a load that has a poor VSWR. While
operating into a load that has poor VSWR, the amplifier may not deliver specified
output power. In extreme cases, the amplifier folds back to protect internal circuitry.
CBA Manual: H012161 Rev: 3
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