Getting Started - PMK LILCO-Serie Bedienungsanleitung

Getting Started

1) First Installation
The current to be measured, the INPUT Monitor Current conductor, I
inner hole of the current transformer for the measurement (Figure 2).
Tip! The INPUT conductor should be as short as possible to reduce the insertion impe-
dance of adding this current loop to the circuit under test.
The PMK LILCO series current transformers have an output impedance of 50Ω and are typically
connected to a measurement device via a 50Ω coaxial cable for the measurements.
The INPUT conductor must also be adequately insulated for the INPUT voltage levels.
The BNC output is connected to a measurement device with either high-impedance input, like
the 1 MΩ input of an oscilloscope or to any 50Ω measurement instrument.
Tip! If the electrical length of the coaxial connecting cable is greater than about 1/10 of
the wavelength for the fastest signal to be viewed, improvements in pulse-edge fidelity
can be obtained by terminating the coaxial connecting cable at the measurement device
into a 50Ω termination.
2) Connection
The measurement device input termination not only affects the low frequency performance, but
also the sensitivity and low frequency bandwidth (droop) performance of the current transfor-
mer. The sensitivity [V/A] is determined by the parallel combination of the current transformers
internal 50Ω, R
INTERNAL
rement device input termination from 1 MΩ to 50Ω will reduce the sensitivity [V/A] by a factor
of two (half the voltage at V
will also decrease by a factor of two, improving the current transformers ability to capture lower
frequency signals significantly.
Tip! Extend the electrical specification with changing the input termination of the measuring
instrument only, see section "How to extend the LILCO
The optional ATT10BNCS attenuator is used to extend the low frequency cut-off point, decrease
the amount of droop error, increase I·t, and reduce the output sensitivity of the PMK LILCO
Series current transformers. This allows more accurate measurements for lower frequency signals
while maintaining the high frequency performance of the current transformer.
Figure 2 - Basic Connection to the Circuit Under Test
* See Output BNC Termination Selection Table
, and the measurement device input termination. Switching the measu-
). At the same time the lower bandwidth (LF 3 dB BW) and droop
OUT
, is inserted through the
PRI
Series Performance" in this manual.
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LILCO Series
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