AMETEK MX CTSH - Manual (Page 133)

User Manual MX Series CTSH Compliance Test System
15.6 Flicker Reference Impedances
Flicker measurements require the use of a reference impedance according to IEC 725. Since this
reference impedance has to be matched to the output of the AC source used, a reference
impedance matched to the MX power source must be used.
For MXCTSH systems, the OMNI-3-75 is required. For MXCTSL systems, the OMNI-3-37MX is
recommended. For MXCTSHL systems, both OMNI's may be used although only one can be
controlled from the CTSMXH or CTSMXL software while the other must be operated in manual
mode from it’s front panel. If both OMNI’s are present, only one can be used at a time. This is
controlled through a set of circuit breakers on the front panel of the OMNI-3-37 cabinet. There is
one circuit breaker for each OMNI present. Close the breaker for the OMNI that is to be used
depending on the test (IEC 61000-3-3 or IEC 61000-3-11) used.
Refer to the MXCTSL User Manual (P/N 7003-973) for OMNI-3-37MX specifications.
Model Phases Flicker Impedance
OMNI-3-37MX 3 0.24 + 0.15j Phase
0.16 + 0.10j Neutral
OMNI-3-75 3 0.15 + 0.15j Phase
0.10 + 0.10j Neutral
15.7 OMNI-3-75 Specifications
The MXCTS systems based on the MX Series and require the use of an external reference
impedance. The OMNI-3-75 can be controlled by the CTSMXH Software through the MX GPIB or
RS232C interface. This requires connection of the MX System interface cable to the back panel of
the OMNI-3-75. If configured as such, the CTSMXH software can switch the OMNI-3-75 from
bypass to flicker automatically depending on what test is being run.
Reference Impedance
Phases 3
Flicker Mode:
Max. Current 75 A
Useable range 2.0 - 75 A
Bypass Mode:
Max. Current 275.0 A
Impedance @ 50 Hz in Flicker Mode:
Phase 0.15 + j0.15
Ω
Neutral 0.10 + j0.10
Ω
Accuracy < 5 %
Controls and Indicators
Flicker On/Off push button
Power Led
Bypass mode Led
Flicker mode Led
California Instruments Revision G 130