Application Notes
Inductance Measurements
You can use the TCPA300 and TCPA400 to measure induc t ance of coils. Two
different methods can be used: one for low-impedance pulse sources and another
for high-impedance pulse sources of known value.
Low-Impedance Pulse
Sources
This figure shows a constant-voltage pulse generator of extremely low output
impedance connected to an inductor that has low resistance. (See Figure 21.)
1. Connect the inductor across the output terminals of the pulse generator.
2. Maintain a constant voltage across the inductor.
3. Clamp the
current probe over one of the source leads.
Figure 21: Measuring inductance with a low-impedance source
NOT
E. Iftheprobeimpedanceisasignificant part of the total circuit inductance,
measurement accuracy will be affected. Refer to the probe specifications for
probe insertion i mpedance.
TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes User Manual 37
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