Control Summary
When this LED bl
inks red and orange, it indicates that both the safe operating
temperature of the probe and the current limit have been exceeded.
WARNING. To avoid personal injury or equipment damage, do not exceed the
specified electrical limits of the TCPA300 and TCPA400 o r any applicable
accessories.
NOT TERMINATED
When lit, th
is indicator informs you that the TEKPROBE interface cable or BNC
cable from the OUTPUT of the amplifier is not connected to a 50 Ω input on the
oscilloscope. You need to switch the termination setting on the oscilloscope to
50 Ω,orusea50Ω termination on the oscilloscope input.
NOTE. NOT TERMINATED INTO 50 Ω is only detected during the DEGAUSS
AUTOBALANCE operation.
NONCOM
PATIBLE
When lit, this indicator informs you that the probe that is connected to the
amplifier is not designed to work with the amplifier. TCP3XXA probes only
work with the TCPA300 Amplifier, and the TCP404XL probe only works with
the T C
PA400 Amplifier.
ON/STANDBY Button
Use this button to power on the amplifier. When the amplifier is in STANDBY
mode, the amplifier is in a limited-power mode. Most of the secondary circuitry is
dis
abled, but the line voltage remains connected to the a mplifier power supply.
RANGE Button
Press the RANGE button to toggle between the scale factors (sensitivity settings)
of the probe attached to the TCPA300. If no RANGE LEDs are lit, this indicates a
pr
obe is not connected to the amplifier.
COUPLING Button and
Indicators
The COUPLING button determines the coupling between the TCPA300/TCPA400
and the oscilloscope. Press the COUPLING button to toggle between AC and
D
C coupling. To couple the amplifierforDCplusACmeasurements,useDC
coupling. For AC measurements only, use AC coupling. When the amplifier is set
to AC coupling, the Manual Balance adjustment is disabled since the DC offset
component is n ot visible on the output waveform.
NOTE. Even when making AC current measurements, leave the oscilloscope
coupling on DC. Change only the amplifier coupling to AC. Using the oscilloscope
AC coupling may cause the amplifier to exceed its output dynamic range.
20 TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes User Manual
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