Reference Notes
Procedure A: M aximum
Allowable Pulse Width
To determine th
e maximum allowable pulse width do the following:
1. Measure the peak current of the pulse.
2. Divide the Ampere-second (or Ampere-microsecond) specification for the
range setting of the probe by the measured peak current of the pulse. The
quotient is
the maximum allowable pulse width (PW
max
).
For example, the TCP312 Current Probe has a maximum Ampere-second
product of 500 Arms in the 10 A/V range setting. If a pulse measured with
a TCP312 has a peak current of 40 A, the maximum allowable pulse width
would be 500 Arms divided by 40 A, or 12.5 μs.
3. Check that the pulse width at the 50% point of the measured signal is less than
the calculated m aximum allowable pulse width (PW
max
).
Figure 13: Applying the amp-second product rule
26 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes User Manual
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