ETS-Lindgren 94606-6 Current Probe - Manual (Page 44)

44 | Operation
I N T ERMS OF M ICROAMPERE IN T EST S AMPLE L EAD
(CW C ONDUCTED M EASUREMENTS )
1. Adjust the EMI test equipment for standard gain and make a
measurement of the CW signal (voltage output from current probe) in
terms of microvolts at meter input. Use procedures outlined in the EMI
test equipment instruction manual.
2. Divide the microvolt measurement of the previous step by the transfer
impedance in ohms at the test frequency. The result is the value of
conducted CW signal in terms of microamperes in the test sample
lead.
Example:
Frequency is 3.0 kHz; step 1 measurement is 150 microvolts.
For example, suppose the transfer impedance of the current probe was
0.34 ohms. Then, as outlined in step 2, 150/0.34 = 441.1
microamperes in the test sample lead.
I N T ERMS OF M ICROAMPERE PER M EGAHERTZ IN T EST S AMPLE L EAD
(B ROADBAND I NTERFERENCE M EASUREMENT )
1. Adjust the EMI test equipment for standard gain and make a
measurement of the broadband interference (voltage output from
current probe), in terms of microvolts per megahertz at meter input.
Use procedures outlined in the EMI test equipment instruction manual.
2. Divide the microvolt per megahertz measurement of the previous step
by the transfer impedance in ohms at the test frequency. The result is
the value of conducted broadband interference in terms of microamps
per megahertz in the test sample lead.
Example:
Frequency is 10.0 kHz; step 1 measurement is 8000 microvolts per
megahertz. For example, suppose the transfer impedance of the
current probe was 0.39 ohms. Then, as outlined in step 2,
8000/0.39 = 20513 microamps per megahertz in test sample lead.