Fluke 1623 Fluke 1623 and 1625 Geo Earth Ground Testers Datasheet - Page 5

1625 Specifications General Description Measuring function Display Operation Microprocessor controlled, fully automated earth measuring instrument with additional functions 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 4 digit (2999 Digit) - 7 segment liquid crystal display, digit size 18 mm (0.71 in) with supplementary signs and active illumination Central rotary switch and function keys Temperature ranges Working temperature range Operating temperature range Nominal temperature range Storage temperature range -10 °C to 50 °C (14° F to 122° F) 0 °C to 35 °C (32° F to 95° F) 18 °C to 28 °C (64° F to 82° F) -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 RH < 20 RE, RS < 100 RE 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, 162/3 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 RA 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. 5 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers