Tektronix TCP300A, User Manual

Page: 38 / 82

Control Summary
When this LED blinks 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
speci fi ed electrical limits of the TCPA300 and TCPA400 or any applicable
accessories.
NOT TERMINATED When lit, this indicator informs you that the TEKPROBE interface cable or BNC
cable from the OUTPUT of the ampli
fi er is not connected to a 50 Ω input on the
oscilloscope. You need to switch the termination setting on the oscilloscope to
50
Ω , or use a 50 Ω termination on the oscilloscope input.
NOTE. NOT TERMINATED INTO 50 Ω is only detected during the DEGAUSS
AUTOBALANCE operation.
NONCOMPATIBLE When lit, this indicator informs you that the probe that is connected to the
ampli
fi er is not designed to work with the ampli fi er. TCP3XXA probes only
work with the TCPA300 Ampli fi er, and the TCP404XL probe only works with
the TCPA400 Ampli fi er.
ON/STANDBY Button Use this button to power on the ampli fi er. When the ampli fi er is in STANDBY
mode, the ampli fi er is in a limited-power mode. Most of the secondary circuitry is
disabled, but the line voltage remains connected to the ampli fi er 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
probe is not connected to the ampli
fi er.
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
DC coupling. To couple the ampli
fi er for DC plus AC measurements, use DC
coupling. For AC measurements only, use AC coupling. When the ampli fi er is set
to AC coupling, the Manual Balance adjustment is disabled since the DC offset
component is not visible on the output waveform.
NOTE.
Even when making AC current measurements, leave the oscilloscope
coupling on DC. Change only the ampli fi er coupling to AC. Using the oscilloscope
AC coupling may cause the ampli fi er to exceed its output dynamic range.
20 TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual