Tektronix TCP300 Series, User Manual, Page: 44 / 80

Reference Notes
Procedure A: Maximum
Allowable Pulse Width
To determine the maximum allowable pulse width do the following:
1. Measure the peak current of the pulse.
2. Divide the Ampere-second (or Ampere-microsecond) speci fi cation 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
μ s.
3. Check that the pulse width at the 50% point of the measured signal is less than
the calculated maximum allowable pulse width (PW
max
).
Figure 13: Applying the amp-second product rule
26 TCPA300/400 Ampli fi ers and TCP300/400 Series Current Probes User Manual