AMETEK MX CTSL - Manual (Page 148)

User Manual MX-CTSL Compliance Test System
18. Principle Of Operation
18.1 General
The Compliance Test System is a power measurement and power analyzer system. The three
basic building blocks are:
•
AC power, either line power or, typically, a CI power source to provide the proper voltage and
frequency for the test at hand.
•
PACS-3-75 measurement unit. This device measures the actual current and voltages under
test and conditions the signals to be compatible with the Analog to Digital data conversion
card.
•
CTSMXL Software. The software is the final link to the user. It translates the data from the AD
card into viewable and readable measurements in a GUI format.
18.2 AC Power
The AC power source provides precise control of voltage and frequency is needed, as in IEC
regulatory testing.
18.3 PACS-3-75 Measurement Unit
The PACS-3-75 measurements module uses Hall Effect current sensors to isolate and scale a
sense voltage that is an accurate and linear function of the current being measured. The sensing
amplifiers uses differential sensing to reduce common mode noise pick-up before it is sent to the
interface connector for transmission to the host PC.
To sense the applied voltage, another set of differential amplifiers are used together with high
precision sense resistors to provide high CMRR. The sense resistors are of high enough
impedance to limit any leakage current to under 0.5mA.
18.4 OMNI-3-37MX Impedance
The OMNI-3-37MX provides the required lumped impedance (Zref) for IEC 61000-3-11 Flicker
testing of EUT's up to 37 A RMS per phase.
18.5 CTSMXL Software
The CTSMXL Software is designed to work with the data acquisition card’s digital samples of
voltage and current. Numerous data channels are scanned sequentially and the software then
calculates many parameters using Fast Fourier Transforms and displays them in the Graphical
User Interface. In addition to numerical outputs of voltage current, power etc., the software also
displays real time graphics of voltage and current.
California Instruments Revision H 145