Tektronix TCP300A, User Manual

Page: 26 / 82

Getting Started
Connecting the Ampli fi er 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/ampli
fi er combination, the
oscilloscope must be capable of displaying a vertical scale factor of 1 mV/div to
1 V/div.
If you are using a TEKPROBE II-compatible oscilloscope, use the
TEKPROBE-to-TEKPROBE interface cable. Otherwise, use the supplied
50
Ω BNC cable to connect the ampli fi er OUTPUT connector to your oscilloscope.
(See Figure 1 on page 1.)
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 attach a 50 Ω feed-through termination between the oscilloscope input
and the BNC cable. Do not install this termination at the ampli fi er end of the
BNC cable.
To utilize the full bandwidth capability of the TCPA300 and TCPA400 and
attached current probe, the oscilloscope bandwidth must be approximately
fi ve
times that of the current probe. For example, when using a TCP312A Current
Probe, the oscilloscope bandwidth must be at least 500 MHz. When using a
TCP305A Current Probe, the oscilloscope bandwidth must be at least 250 MHz.
After you have connected the ampli fi er to the oscilloscope, allow the equipment
to warm up to a stable temperature; usually 20 minutes is required.
Power on the Ampli fi er
Connect the power cord to the power input connector on the rear of the ampli fi er,
and then connect the power cord to your local mains supply (100 VAC to
240 VAC, 50 Hz to 400 Hz). To allow for proper ventilation, place the rear panel
of the ampli
fi er at least 2 inches away from any obstructions. Set the ampli fi er on
the bottom rubber feet, and keep papers and other items away from the bottom of
the ampli
fi er which could restrict air fl ow and cause overheating.
Power on the ampli fi er by pressing the ON/STANDBY button at the lower-left
corner of the front panel. The ampli fi er goes through a self-test and cycles the
front-panel LEDs.
NOTE.
The ampli fi er stores the power state it is in when the power cord is
unplugged. If you do not put the ampli fi er into STANDBY mode before unplugging
it, the ampli fi er will power on immediately when you plug it in again.
When you connect a probe to the ampli fi er, the ampli fi er uses detection circuitry
to indicate probe conditions such as noncompatible probe type and probe open.
8 TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual