Installation
To utilize the f
ull bandwidth capability of the TCPA300 and TCPA400 and
attached current probe, the oscilloscope bandwidth must be approximately five
times that of the current probe. For e xample, 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 amplifier to the oscilloscope, allow the equipment
to warm up to a stable temperature; usually 20 minutes is required.
NOTE. To obtain accurate measurements, the input impedance of your
oscillosc
ope must be 50 Ω. Make sure your amplifier OUTPUT is connected to
an oscilloscope input using a 50 Ω BNC cable, and that the oscilloscope i nput is
set to 50 Ω impedance.
Power on the amplifier
1. Connect the power cord to the power input connector on the rear of the
amplifier, a nd then connect the power cord to your local mains supply
( 1 0 0 VA C t o 2 4 0 VA C , 5 0 H z t o 4 0 0 H z ) .
2. To allow for proper ventilation, place the rear panel of the amplifier at least
2 inches away from any obstructions. Set the amplifier on the bottom rubber
feet
, and keep papers and other items away from the bottom of the amplifier
which could restrict airflow and cause overheating.
3. Pres
s the ON/STANDBY button on the amplifier front panel. The a mplifi er
goes through a self-test and cycles the front-panel LEDs.
NOTE. The amplifier stores the power state it is in when the power cord is
unplugged. If you do not put the amplifier into STANDBY mode before unplugging
it, the amplifier will power on immediately when you plug it in again.
4. Degauss the probe before taking measurements. For more information, refer
to the TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes
User Manual, Tektronix part number 077-1183-xx, for additional instructions
on degaussing and performing a functional check.
NOTE. The amplifier stores the power state it is in when the power cord is
unplugged. If you do not put the amplifier into STANDBY mode before unplugging
it, the amplifier will power on immediately when you plug it in again.
When you connect a probe to the amplifier, the amplifier uses detection circuitry
to indicate probe conditions such as noncompatible probe type and probe open.
Amplifiers a nd Current Probes Compliance and Safety Instructions 15
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