3
be followed by the user to ensure safe operation and to maintain the apparatus in
a safe condition.
We reserve the right to make changes and improvements to the product without
obligation to incorporate these changes and improvements into units previously
shipped.
High Voltage Terminal: Use extreme care when making high voltage
measurements; do not touch terminals or probe ends.
Limit voltage, with respect to earth ground, to 600VDC/VAC maximum.
A terminal connected to earth ground.
This Instrument is designed to prevent accidental shock to the operator when
properly used. However, no engineering design can render safe an instrument
which is used carelessly. Therefore, this manual must be read carefully and com-
pletely before making any measurements. Failure to follow directions can result
in a serious or fatal accident.
SHOCK HAZARD: As defined in IEC-1010-2,
Safety Requirements for Electrical
& Electronic Measurement, Control and Laboratory Use,
a shock hazard shall be
considered to exist at any part involving a potential in excess of 30 volts RMS
(sine wave) or 42.4 volts DC or peak and where a leakage current from that part
to ground exceeds 0.5 MIU (Measurement Indication Units) when measured
with an appropriate measuring instrument defined in Section 6.3.1.2 annex A of
IEC-1010-1.
NOTE: UL-1244 calls for the same voltage and measurement limits as IEC-1010-
1:1990 but UL-1244 specifies a slightly different test network. Simpson Electric manu-
factures test equipment to measure shock hazard as set forth by both specifica-
tions. The Simpson Model 228 uses the networks specified by IEC-1010-1 and is
suitable for measuring shock hazard as defined in that document. The Simpson
229-2 uses the measurement networks specified in UL-1244 and is suitable for
measuring shock hazard as defined in that document.
Instruments such as the Model 228 are intended for use in relatively low power 120/
240 VAC or dry battery operated circuits. Never use this Instrument for measure-
ments in high-energy or high-power circuitry such as power substations, distribution
centers, RF induction heaters, broadcast transmitters and X-ray equipment. The
Safety Precautions in this manual alert you to such hazards and the protective
measures necessary to avoid injury or equipment damage. The dangers in high power
circuits are serious. Please observe all safety precautions!
!
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