5 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
General
Description Microprocessor controlled, fully automated earth measuring instrument with additional functions
Measuring function Interference voltage and frequency, earthing resistance 3- and 4-pole with/without clip-on current transformer,
resistance 2-pole with ac, 2- and 4-pole with dc
Display 4 digit (2999 Digit) - 7 segment liquid crystal display, digit size 18 mm (0.71 in) with supplementary signs and
active illumination
Operation Central rotary switch and function keys
1625 Specifications
Temperature ranges
Working temperature range -10 °C to 50 °C (14° F to 122° F)
Operating temperature range 0 °C to 35 °C (32° F to 95° F)
Nominal temperature range 18 °C to 28 °C (64° F to 82° F)
Storage temperature range -30 °C to 60 °C (-22° F to 140° F)
Note: The chart of four temperature ranges for the instrument exist to satisfy European Standards requirements; the instrument can be used over the full Working
temperature range by using the temperature coefficient to calculate accuracy at the ambient temperature of use.
Temperature coefficient ± 0.1 % of range/Kelvin
Operating errors Refer to operating temperature range and R
H
< 20 R
E
, R
S
< 100 R
E
The maximum percentage operating error within the measurement range does not exceed ± 30 % with the measured value as fiducial value, as determined in
accordance with Table 1 in the 1625 Users Manual.
The operating error applies under the rated operating conditions given in IEC1557-1 and the following:
• injection of series interference voltages with system frequencies of 400 Hz, 60 Hz, 50 Hz, 16
2
/3 Hz or with dc voltage respectively across the terminals E (ES)
and S. The rms value of the series interference voltage shall be 3 V;
• resistance of the auxiliary earth electrode and of the probes: 0 to 100 x R
A
but b 50 k7;
• system voltages between 85 % and 110 % of the nominal voltage and between 99 % and 101 % of the nominal system frequency for measuring equipment
with a mains supply and/or measuring equipment deriving its output voltage directly from the distribution system.
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