Tektronix TCPA300 SERIES, Instruction Manual

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TCP305 and TCP312 Performance Verification
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
5- 25
Table 5- 14: Equipment settings for rise time
Oscilloscope
Vertical input impedance 50
Ω
Vertical scale 200 mA/division
Time base 2 ns/division
Record length 500
Coupling DC
Offset 0 V (mid-scale)
Trigger type Edge
Trigger mode Auto
Trigger position 50%
Acquisition mode Average
Number of waveforms to average 32
Measurement type Rise Time
High amplitude pulse generator
Amplitude Maximum
TCPA300
Coupling DC
Range TCP305 5A/V
TCP312 1A/V
1. Do not clamp the current probe around any conductor, but make sure the
jaws are locked shut.
2. Press the amplifier PROBE DEGAUSS AUTOBALANCE button. Wait for
the degauss/autobalance routine to complete before proceeding. The routine
is complete when the indicator light turns off.
3. Clamp the current probe around the HF current loop. Verify that the
arrow-shaped indicator on the probe points away from the pulse generator.
4. Adjust the vertical gain and vertical position of the oscilloscope so that 5 to
8 divisions are displayed. (You may have to adjust the pulse generator output
to achieve this.)
5. Using the measurement capability of the oscilloscope, measure the rise time
of the displayed pulse from 10% to 90% amplitude.
6. If the rise time of the pulse generator is greater than 1/4 of the rise time of
the probe you are testing, calculate the rise time of the probe (
t
r
probe ) using
the formula below:
t
r
probe
=
t
r
measured
2 −
t
r
system
2
Ꭹ
The measured rise time ( t
r
measured ) is the value calculated in step 5.
Procedure