DATREND Systems ES601-US, Operating Manual

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ES601-US OPERATING MANUAL
Setup/Chapter 3
#
Page 26
TEST MULTIPLE
RESISTANCES:
If set to "YES", this control will enable multiple ground and/or point-to-
point resistance measurements within the scope of a manual ground
resistance test. Up to ten resistance measurements may be recorded by
ES601-US in multiple resistance mode. If set to "NO" (factory default), a
manual ground resistance test is completed by performing a single
measurement of the resistance.
TEST
GROUND WIRE
RESISTANCE:
If set to "YES" (factory default), this control will enable measurement of the
ground wire or power cord resistance in a manual test. For this type of test,
resistance is measured between the ground terminal on the line cord plug and
the Kelvin Cable of ES601-US, which would typically be connected to a
grounding stud (ground terminal) or the metal enclosure of the DUT. If set to
"NO", point-to-point resistance measurements will then be enabled by means
of the control below.
TEST POINT-TO-PT
RESISTANCE:
If set to "YES", this control will enable measurement of resistance between
two points, one being the point of attachment of the Kelvin Cable of ES601-
US, and the other being the point of attachment of a test lead which connects
to the "TO DUT CASE" jack of ES601-US. If set to "NO" (factory default),
point-to-point resistance testing is disabled in manual mode. This control
works with the "TEST MULTIPLE RESISTANCES" control and the "TEST
GROUND WIRE" control above, thereby providing a variety of protocols
for testing the ground resistance as described in Section 5.9.
CALIBRATE
OFFSET: The "
OFFSET:
" displayed to the right of this control is the resistance of the
test lead used in measuring point-to-point resistance. In a point-to-point test,
the
OFFSET calibration shown on Systems Settings Menu #2 is subtracted
from the measured resistance to obtain the result which is displayed by
ES601-US. The factory default value is 0.050 ohms, which is representative of
a typical test lead of 2-metre length. However, prior to performing point-to-
point tests, the
OFFSET
of the actual test lead connected to ES601-US
should be determined. Section 5.9 provides instructions for calibration of the
test lead
OFFSET
.
The OFFSET calibration differs from other Sequence Controls on Systems
Settings Menu #2 in that it pertains to manual safety tests
as well as
automated safety tests.