Tektronix TCP303, Safety Instructions

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Operate the ampli fi er
Overload conditions
LED color Overload condition Recommended action 1
Solid red Measured continuous
current is exceeding the
continuous current limit of
the probe.
Flashing
red Measured current waveform
has pulses that are
exceeding the limits of
the probe.
Disconnect the probe from the current
source.
Reduce the current source amplitude or
use a higher probe current range or a
higher-rated current probe.
Solid
orange
The operating temperature
of the probe or the ampli
fi er
has been exceeded.
Flashing
red and
orange Both temperature and
current limits have been
exceeded.
Disconnect the probe from current
source and allow time for the probe
head and ampli
fi er to cool. Shorten the
measurement time duration or use a
higher-rated current probe.
All LEDs
fl ashing
Probe & ampli fi er thermal
shutdown has occurred.
Disconnect the probe from the current
source. Power-cycle the ampli
fi er and
let the probe and ampli fi er adequately
cool down (typically 15 minutes) before
taking measurements again. Shorten
the measurement time duration or use a
higher-rated current probe.
1 Since current overloads can magnetize the probe, always degauss the probe after an overload condition.
Temperature shifts can also affect the probe accuracy; degauss the probe if the probe head or ampli fi er
temperature changes more than 5 °C.
WARNING. To avoid personal injury or equipment damage, do not exceed the
speci fi ed electrical limits of the TCPA300 and TCPA400 Ampli fi ers or any
applicable probe accessories.
Ampli fi ers and Current Probes Compliance and Safety Instructions 19