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Appendix 3 Standards for Leakage Current and Current Measurements
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3.2.2 Safety of Information Technology Equipment (IEC 60950 (1991-10)
+ am4 (1996-07))
Power supply
Most unfavorable voltage
Point of measurement
Between the accessible conductive part or accessible measurement non-
conductive part and the power line (For class
equipment, use a 10 cm
×
20
cm sheet of metallic foil.)
Measurement network
Same as "Measurement network, touch-current weighted for perception /
reaction" in Appendix 3.2.1, "Methods of measurement of touch-current and
protective conductor current (IEC/TR 60990 (1990-06))"
Measurement
Measure with an insulated transformer.
Measure with a voltmeter.
・
Measured current: true rms
・
Variance: 2% max.
・
Input resistance: 1 M
Ω
min.
・
Input capacity: 200 nF max.
・
Frequency range: 15 Hz to 1 MHz
Allowable values
(1) Class
equipment (all types) 0.25 mA
(2) Class
equipment
・
Hand-held type 0.75 mA
・
Movable type 3.5 mA
・
Fixed / pluggable type 3.5 mA
・
Fixed / permanently connected or pluggable type B 3.5 mA (for currents of
more than 3.5 mA, 5% input current)
Insulating transformer
Equipment under test
L
N
2
1
Measuring instrument
Equipment protective
earth terminal
Equipment protective
earth terminal
Measuring instrument
Equipment under test
N
Insulating transformer
Test circuit for earth leakage current on single-phase equipment
Test circuit for earth leakage current on three-phase equipment
Selector switch
(1) Earth leakage current measurement
Содержание 3155-01
Страница 1: ...LEAK CURRENT HiTESTER INSTRUCTION MANUAL 3155 01...
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Страница 27: ...7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 2 Names and Functions of Parts...
Страница 45: ...25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 4 Preparations for Measurement...
Страница 129: ...109 5 11 System Screen ME Equipment Example of a data unit printout Example of a details printout...
Страница 135: ...115 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 6 Ordinary Electrical Equipment Measurement Network C Installed...
Страница 189: ...169 6 7 System Screen for IEC TR 60990 Example of a data unit printout Example of a details printout...
Страница 195: ...175 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 7 Ordinary Electrical Equipment Measurement Network D Installed...
Страница 243: ...223 7 7 System Screen Universal Example of a data unit printout Example of a details printout...
Страница 314: ...294...
Страница 322: ...302 9 3 Accuracy Tables...
Страница 334: ...314 10 6 External Dimensions 292 2 110 2 212 2 115 8 2 10 6 External Dimensions...
Страница 335: ...315 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 APP Appendices...
Страница 362: ...INDEX 6 Index...
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