User manual

TCPA300 and TCPA400 Performance Verification
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5-9
Bandwidth
This procedure tests the bandwidth of the TCPA300 and TCPA400 amplifiers. In
this test you measure a signal at a relatively low frequency and again at the upper
test frequency. The two measurements are compared to verify that the signal
amplitude does not fall below a certain limit. Refer to Figure 5--3 when making
equipment connections.
Leveled
sine wave
generator
Output
Test oscilloscope
Amplifier
TekProbe interface cable or
50 Ω coaxial cable
Calibration
adapter
50 Ω oscilloscope input -- use the TekProbe
InterfaceCableorusea50Ω cable. (Add
50 Ω termination here if oscilloscope has
only high-impedance input.)
Note: If using a Wavetek 9100, use the Signal Out
BNC connector on the rear of the instrument.
Figure 5- 3: Bandwidth test setup
1. If you are using a Tektronix oscilloscope that supports the TekProbe Level 2
Interface, use the TekProbe interface cable to connect the amplifier OUT-
PUT to the oscilloscope input. If you are not using a Tektronix oscilloscope
that supports the TekProbe Level 2 Interface, use a 50 Ω BNC cable. If the
input impedance of your oscilloscope is 1 MΩ, connect a 50 Ω feedthrough
termination at the oscilloscope input. Do not connect the termination at the
amplifier output.
2. Connect the Calibration Adapter to the amplifier PROBE INPUT.
3. Make or verify the equipment settings in Table 5--6:
Table 5- 6: Equipment settings for bandwidth check
Oscilloscope
Vertical input impedance 50 Ω
Time base TCPA300
TCPA400
40 ns/division
80 ns/division