4535 612 10261 HD11 Service Manual Page 144
CSIP Level 1 Performance Tests: Electrical Safety Tests
• The Transducer Isolation Leakage Current test applies mains voltage to the leads to check a
transducer for electrical leakage. See “Transducer Isolation Leakage Current Test” on
page 156.
All tests can be performed using commercially available safety analyzer test equipment. Basic
measurements can be performed with multifunction instruments like the HP 3469A multimeter.
NOTE These procedures require a safety analyzer. Routinely use a safety analyzer as a final
step in any repair or upgrade, to maintain agency approved status. The safety analyzer is
also useful in detecting abnormalities of line voltage, grounding, and total current loads.
Follow the instructions of the analyzer manufacturer.
The limits referenced in these tests are prescribed by UL, CSA, and IEC. Local regulations may
require additional tests.
Chassis to
Ground
Resistance Test
This test checks the entire system for electrical resistance between the chassis and ground.
Figure 6-1 on page 145 shows the basic electrical concept of the ground resistance test. Use a
safety analyzer and complete the procedure that follows the figure.
WARNING Some users routinely perform a safety-earth or ground-bonding test at currents in excess of
10 A. Test currents in excess of 1 A will likely exceed the impedance limit specification, and can
damage the RFI protection finger contacts. Exposed metal on the transducer assembly, including
the connector, are for RFI and are not safety grounds.
To Next Page
Loading...