Tektronix TCP300A, User Manual

Page: 46 / 82

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 TCP312A Current Probe has a maximum Ampere-second
product of 500 A-
μ s in the 10 A/V range setting. If a pulse measured with a
TCP312A has a peak current of 40 A, the maximum allowable pulse width
would be 500 A-
μ s 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 14: Applying the amp-second product rule
28 TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual