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 bothNOT BE ABOVE
0.5mA)
the technician and the customer. Correctly replace
LEAKAGE
DEVICECURRENT
all missing protective shields, including anyTESTER
UNDER
removed for servicing convenience. TEST
(2)When reinstalling the chassis and/or other as-TEST ALL
EXPOSED METER
sembly in the cabinet, be sure to put back in place
SURFACES
all protective devices, including, but not limited to,
2-WIRE CORD
nonmetallic control knobs, insulating fish papers,
adjustment and compartment covers/shields, andALSO TEST WITH
EARTH
isolation resistor/capacitor networks. Do not oper-PLUG REVERSEDGROUND
(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 insertthe power supply cord and connect a jumper wire
their fingers and contact a hazardous voltage. Suchbetween 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 backjumpered 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 instrumentan exposed metallic part has a return path to the
completely reassembled, plug the AC line cordchassis, the reading should be between 1 and 5.2
directly into a 230V(220V ~ 240V) AC outlet. (Domegohm. When there is no return path to the chas-
not use an isolation transformer during this test.)sis, the reading must be infinite. If the reading is
Use a leakage current tester or a metering systemnot within the limits specified, there is the possibil-
that complies with American National Standardsity of a shock hazard, and the instrument must be
institute (ANSI) C101.1 Leakage Current forrepaired and rechecked before it is returned to the
Appliances and Underwriters Laboratories (UL)customer. See Fig. 1-2.
1270 (40.7). With the instruments AC switch first in
the ON position and then in the OFF position, mea-
Antenna
sure from a known earth ground (metal water pipe,
Terminal
conduit, etc.) to all exposed metal parts of the
instrument (antennas, handle brackets, metal cabi-
nets, screwheads, metallic overlays, control shafts,
Exposed
etc.), especially any exposed metal parts that offer
Metal Part
an electrical return path to the chassis.
Any current measured must not exceed 0.5mA.
Reverse the instrument power cord plug in the out-ohm
ohmmeter
let and repeat the test. See Fig. 1-1.
Fig. 1-2 Insulation Resistance Test
1-1 |
ACEC
ALINCO
