Fluke 1625-2 User Manual - Page 23

Description of Functions, Interference Voltage U

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Earth/Ground Tester Setup Description of Functions The functions are selected with the central rotary switch. Four push buttons start measurements, read out supplementary measurement values, and select special functions. See Table 6 for more information. Measurement values are shown on a liquid crystal display with units. Additional special characters indicate measurement mode, operating condition and error messages. The Tester includes these measurement functions: • Interference Voltage (UST) • Interference Frequency (FST) • Earthing Resistance (RE) • Selective Measurement of Earthing (RE ) • Resistance (R~) • Low Resistance (R) • Checking for Correct Measurement Connection • Beeper • Battery Level Indicator Fullwave rectification for dc and ac. If limit values are exceeded no measurement will be started. For interference voltage >1 V its frequency is derived from the period time. The earthing resistance is determined by a 3-pole or 4-pole current and voltage measurement. The measuring voltage is a square pulse ac voltage with 48 / 20 V and a frequency of 94, 105, 111 or 128 Hz. The frequency can be selected manually or automatically (AFC). 55 Hz in function R*. Measurement of a single earth electrode in a mesh operated (parallel) earthing system. The current flowing through the single earth electrode is measured with an external current transformer. The resistance is determined by a 2-pole current and voltage measurement. The measuring voltage is a square pulse ac voltage with 20 V and a frequency of 94, 105, 111 or 128 Hz. The frequency can be selected manually or automatically (AFC). The resistance is determined by dc current and voltage measurement. 2-pole as well as 4-pole measurement is possible. The short circuit current is > 200 mA. The resistance of both current directions is measured and stored. The Tester checks if the measuring lead is properly connected according to the selected function via isolated, two piece contacts, inside of each 4 mm (banana) input socket, in combination with detection circuitry. A wrong or missing connection is indicated by an optical and acoustical signal. The built-in beeper has two functions: • Send message if set limit values are exceeded. • Indicates dangerous condition or faulty operation. A 4-segment battery level indicator shows the battery status. 15

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Earth/Ground Tester
Setup
15
Description of Functions
The functions are selected with the central rotary switch. Four push buttons start
measurements, read out supplementary measurement values, and select special
functions. See Table 6 for more information.
Measurement values are shown on a liquid crystal display with units. Additional special
characters indicate measurement mode, operating condition and error messages.
The Tester includes these measurement functions:
•
Interference Voltage (U
ST
)
Fullwave rectification for dc and ac. If limit values are
exceeded no measurement will be started.
•
Interference Frequency (F
ST
)
For interference voltage >1 V its frequency is derived
from the period time.
•
Earthing Resistance (R
E
)
The earthing resistance is determined by a 3-pole or
4-pole current and voltage measurement. The
measuring voltage is a square pulse ac voltage with 48 /
20 V and a frequency of 94, 105, 111 or 128 Hz. The
frequency can be selected manually or automatically
(AFC). 55 Hz in function R*.
•
Selective Measurement of
Earthing (R
E
)
Measurement of a single earth electrode in a mesh
operated (parallel) earthing system. The current flowing
through the single earth electrode is measured with an
external current transformer.
•
Resistance (R~)
The resistance is determined by a 2-pole current and
voltage measurement. The measuring voltage is a
square pulse ac voltage with 20 V and a frequency of
94, 105, 111 or 128 Hz. The frequency can be selected
manually or automatically (AFC).
•
Low Resistance (R
)
The resistance is determined by dc current and voltage
measurement. 2-pole as well as 4-pole measurement is
possible. The short circuit current is > 200 mA. The
resistance of both current directions is measured and
stored.
•
Checking for Correct
Measurement Connection
The Tester checks if the measuring lead is properly
connected according to the selected function via
isolated, two piece contacts, inside of each 4 mm
(banana) input socket, in combination with detection
circuitry. A wrong or missing connection is indicated by
an optical and acoustical signal.
•
Beeper
The built-in beeper has two functions:
•
Send message if set limit values are exceeded.
•
Indicates dangerous condition or faulty operation.
•
Battery Level Indicator
A 4-segment battery level indicator shows the battery
status.