Tektronix TCP300A, User Manual, Page: 55 / 82

Application Notes
Inductance Measurements
You can use the TCPA300 and TCPA400 to measure inductance 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 fi gure 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
NOTE.
If the probe impedance is a signi fi cant part of the total circuit inductance,
measurement accuracy will be affected. Refer to the probe speci fi cations for
probe insertion impedance.
TCPA300/400 Ampli fi ers and TCP300A/400 Series Current Probes User Manual 37