Avtech AV-143B, Инструкция по эксплуатации

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FRONT PANEL CONTROLS
1. POWER Switch . This is the main power switch. When turning the instrument on,
there may be a delay of several seconds before the instrument appears to respond.
2. OVERLOAD Indicator . When the instrument is powered, this indicator is normally
green, indicating normal operation. If this indicator is yellow, an internal automatic
overload protection circuit has been tripped. If the unit is overloaded (by operating
at an exceedingly high duty cycle or by operating into a very low impedance), the
protective circuit will disable the output of the instrument and turn the indicator light
yellow. The light will stay yellow (i.e. output disabled) for about 5 seconds after
which the instrument will attempt to re-enable the output (i.e. light green) for about 1
second. If the overload condition persists, the output will be disabled again (i.e. light
yellow) for another 5 seconds. If the overload condition has been removed, the
instrument will resume normal operation.
This overload indicator is only likely to come on in two situations:
•
Briefly at startup. This is not a cause for concern.
•
When the load impedance is too low (< 50 Ω). In this case, turn off the
instrument and connect the proper load.
3. IN Connector . The input signal is applied to this connector. The input impedance is
approximately 1 kΩ. The input must lie within the range of -4V to +4V.
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