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1. Precautions
1-1 Safety Precautions
1) Before returning an instrument to the customer, Any measurements not within the limits specified
always make a safety check of the entire instrument, herein indicate a potential shock hazard that must
including, but not limited to, the following items: be eliminated before returning the instrument to
the customer.
(1) Be sure that no built-in protective devices are
defective or have been defeated during servicing.
(READING SHOULD
(1)Protective shields are provided to protect both NOT BE ABOVE
the technician and the customer. Correctly replace 0.5mA)
LEAKAGE
all missing protective shields, including any DEVICE CURRENT
UNDER TESTER
remove for servicing convenience. TEST
(2)When reinstalling the chassis and/or other as- TEST ALL
sembly in the cabinet, be sure to put back in place EXPOSED METER
SURFACES
all protective devices, including, but not limited to,
nonmetallic control knobs, insulating fish papers, 2-WIRE CORD
adjustment and compartment covers/shields, and ALSO TEST WITH EARTH
isolation resistor/capacitor networks. Do not oper- PLUG REVERSED GROUND
(USING AC ADAPTER
ate this instrument or permit it to be operated with- PLUG AS REQUIRED)
out all protective devices correctly installed and
functioning. Fig. 1-1 AC Leakage Test
(2) Be sure that there are no cabinet openings through (4) Insulation Resistance Test Cold Check-(1) Unplug
which adults or children might be able to insert the power supply cord and connect a jumper wire
their fingers and contact a hazardous voltage. Such between the two prongs of the plug. (2) Turn on the
openings include, but are not limited to, excessive- power switch of the instrument. (3) Measure the
ly wide cabinet ventilation slots, and an improper- resistance with an ohmmeter between the
ly fitted and/or incorrectly secured cabinet back jumpered AC plug and all exposed metallic cabinet
cover. parts on the instrument, such as screwheads,
antenna, control shafts, handle brackets, etc. When
(3) Leakage Current Hot Check-With the instrument an exposed metallic part has a return path to the
completely reassembled, plug the AC line cord chassis, the reading should be between 1 and 5.2
directly into a 120V AC outlet. (Do not use a isola- megohm. When there is no return path to the chas-
tion transformer during this test.) Use a leakage sis, the reading must be infinite. If the reading is
current tester or a metering system that complies not within the limits specified, there is the possibil-
with American National Standards institute (ANSI) ity of a shock hazard, and the instrument must be
C101.1 Leakage Current for Appliances and re-pared and rechecked before it is returned to the
Underwriters Laboratories (UL) 1270 (40.7). With customer. See Fig. 1-2.
the instrument