Installation
TCPA300 and TCPA400
amplifiers
The amplifier am
plifies the current sensed by the probe and c onverts the current
to a proportional voltage that is displayed on an oscilloscope or other similar
measuring device.
Current probes
The followin
g Tektronix current probes are compatible with the
TCPA300 Amplifier:
TCP312A (30
A, 100 MHz)
TCP305A (50 A, 50 MHz)
TCP303 (150 A, 15 MHz)
The following Tektronix current probe is compatible with the TCPA400 Amplifier:
TCP404XL (750 A
1
,2MHz)
1
500 A continuous, 750 A DC derated with duty cycle
Oscilloscope
An oscilloscope displays the output from the current measuring system. A 50 Ω
cable i
s included to connect the amplifier to the oscilloscope input channel. A
TEKPROBE-to-TEKPROBE interface cable is also included for connecting to
TEKPROBE level II o scilloscopes.
If the oscilloscope does not have an input that can be set to 50 Ω impedance, you
need a feedthrough 50 Ω termination. This termination is available as a standard
accessory with your TCPA300 and TCPA400 Current Probe Amplifiers.
Connect the amplifier to an oscilloscope
You will need an oscilloscope to display the TCPA300 and TCPA400 measurement
output. To use the full dynamic range of the probe/amplifier combination, the
oscilloscope must be capable of displaying a vertical scale factor of 1 mV/div to
1V
/div.
If you are using a TEKPROBE II-compatible oscilloscope, use the supplied
T
EKPROBE-to-TEKPROBE interface cable to connect the amplifier OUTPUT
connector to your oscilloscope. Otherwise, use a 50 Ω BNC cable (available
as an optiona l accessory) to connect the amplifier OUTPUT connector to your
oscilloscope. (See Figure 1 on page 13.)
The input impedance of the oscilloscope channel must be 50 Ω, or you will
encounter slowed pulse response, increased aberrations, or incorrect DC
measurement amplitudes. If your oscilloscope provides only 1 M Ω inputs,
you need to a ttach a 50 Ω feed-through termination (available as an optional
accessory) between the oscilloscope input and the BNC c able. Do not install this
termination at the amplifier end of the BNC cable.
14 Amplifiers and Current Probes Compliance and Safety Instructions
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