PREVENTING OUTPUT STAGE FAILURE
The output stage is protected against overload conditions by an overload circuit and
fuses on the main frame back panel. However, the output switching elements may fail if
the unit is triggered at a PRF exceeding 20 kHz or at duty cycles resulting in an
average output power in excess of 14 Watts (59 Watts for units with the -XP1 option,
118 Watts for units with the -XP2 option). Heating and subsequent possible failure of
the output stage is reduced if the following action is taken where possible:
PRF is kept to a minimum, i.e. operate in a low PRF range when possible rather
than in a high PRF range.
Keep the output PW to a minimum.
Never apply an externally generated voltage to the output port.
Reduce the amplitude below 100 Volts before changing the output polarity. Note
that internal protection circuits will prevent the polarity from switching when the
amplitude is set higher than ±100V, until the internal power supplies have
discharged the voltage on the internal energy-storage capacitors to below ±100V.
This may take several seconds.
22
Summary of Contents for AVR-3HG-B
Page 32: ...PCB 158R4 LOW VOLTAGE POWER SUPPLY...
Page 33: ...PCB 284B HIGH VOLTAGE DISCHARGE BOARD...
Page 38: ...PERFORMANCE CHECK SHEET...
