AMETEK MX CTSL - Manual (Page 23)

User Manual MX-CTSL Compliance Test System
California Instruments Revision J 23
DEPTH DURATION
(Voltage drop in % of
nominal Ut)
10 to < 100 ms 100 to < 500
ms
500 ms to 1
sec
1 sec to > 3
sec
10 %o < 30 % 61 66 12 6
30 % < 60 % 8 36 4 1
60 % < 100 % 2 17 3 2
100 % 0 12 24 5
Number of disturbances per year
The need to test for immunity of products against voltage dips and interruptions was prompted by studies of
electric utility availability. The results shown in Table 2-4 were found in this study (UNIPEDE study 91 en
50.02). From this data it is clear that most disruptions are short in nature (about 5 to 10 periods) and no
more than 60 % below nominal. Occasionally however, extended periods of complete power loss occur. It is
suggested that this test data also be used as a guide in selecting appropriate test levels.
2.6.1 Why Do You Have to Test?
The EN 61000-4-11 affects a large set of products, specifically; "Electrical and electronic equipment having
a rated input current not exceeding 16 A per phase." Thus, most single and three phase AC powered
equipment used in domestic and light industrial settings fall in this category. In fact, around 95 % of all
electrical equipment in household and light industrial applications, require no more than 16 A per phase. In
Europe, this implies real apparent levels of 230 V * 16 A = 3680 VA, with real power either at the same or a
lower level. Specifically excluded are all DC powered products (battery operated devices) and 400 Hz AC
equipment. (Avionics) These products will be covered in future IEC standards. At this time meeting the EN
61000-4-11 standard is required for most products to obtain the CE Mark, required to market products in
the European Union.
California Instruments’ MXCTS system supports pre-compliance EN 61000-4-11 testing using the MX
series AC power source with the addition of the -411 firmware option. The test sequencer and report
generation for EN 61000-4-11 is provided through the MXGUI Windows
→
software. To
accommodate changes in the specification, test levels and duration can be set by the operator or
loaded from disk if
Table 2-4: Average public utility disturbances per annum in Europe
needed.
2.7 EN 61000-4-13 Interharmonics and Harmonics Immunity Test
The EN 61000-4-13 is presently only in draft form and the implementation used in the CTS system uses
applies to the first draft of the immunity test specification. The purpose of this test is to verify a EUT’s
immunity to signaling frequencies that may be present on the AC line. These signaling frequencies are not
always harmonically related to the fundamental frequency. As such, this test applies both harmonics and
interharmonic frequencies in addition to the fundamental AC voltage.
The generation of interharmonics requires the addition of an independent signal generator in the MX power
source. (Option -413) If this optional -413 interharmonics generator hardware option is present in the MX,
the EN 61000-4-13 test window will be available from the MXGUI program.
The EN 61000-4-13 draft specification calls out test levels for three product classes, class 2, 3 and X. Class
X involved user defined test levels. Test levels for class 2 and 3 are implemented in the MXGUI while test
levels for class X may be set by the user in the IEC413.413 file.
Note that EN 61000-4-13 is presently only in draft form and as such, hardware and/ or software changes to
this test option may be required at a future date.