Measurement Principle - PMK LILCO-Serie Bedienungsanleitung

LILCO Series
®
About PMK LILCO
With bandwidths ranging from mHz to >60 MHz and input currents ranging from mA up to 25 kA,
the LILCO series of PMK's current transformers enables precision high bandwidth AC current
®
measurements, which are required for a broad range of measurement applications. The current
transformers are capable of accurately measuring large pulse or continuous input currents while
electrical shielding between the input and output reduces the influence of electromagnetic fields
on the output.
The BNC output of the LILCO
measurement devices, such as, oscilloscopes, digitizers, network analyzers, spectrum analyzer,
power analyzers, DMM etc. with just a standard 50Ω coaxial cable.
Improved low frequency performance and increased I·t capability, as well as an attenuated output
signal can be realized by changing the input termination of the measuring instrument. The LILCO
series attenuator ATT10BNCS is used to improve these specifications even more while maintaining
the high frequency performance of the current transformer.
EN

Measurement Principle

The measurement principle is the same as of power transformers. The current transformer has a
primary and a secondary winding, and an alternating current flowing in the primary winding, I
induces an alternating current in the secondary winding, I
flows through the internal 50Ω impedance, R
This burden resistance, R
R time constant along with the secondary winding's inductance, L
BURDEN
bandwidth cut-off point.
Galvanic isolation between input and output allows the LILCO
setups with large potential differences or where unwanted currents between input and output
appear like in ground loops.
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Series Current Transformers
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series current transformers makes it easy to connect to a variety of
®
INTERNAL
, in parallel with the BNC Output Termination, sets the L
INTERNAL
Figure 1 - Simplified Schematic
. The secondary winding current, I
SEC
, generating an output voltage, V
SEC
Series to be used in measurement
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SEC
, (Figure 1).
OUT
SEC
, to set the low frequency
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,
PRI
,
/