Calibration Interval; Technical Data - Unitest TELARIS EARTH Instruction Manual

If an instrument is not used over an extended time period, the accumulators or
batteries must be removed. Should the instrument be contaminated by leaking battery
cells, the instrument has to be returned for cleaning and inspection to the factory.

12.0 Calibration Interval

The instrument has to be periodically calibrated by our service department in order to
ensure the specified accuracy of measurement results. We recommend a calibration inter-
val of two years.

13.0 Technical Data

Display:........................................................... LCD
Duration of measurement:.............................. 3-5s
Measurement principle:.................................. current-voltage measurement principle
Measurement voltage:.................................... 25V/ 50V selection
Current/power consumption:.......................... approx. 10mA/ 0,1W
Measurement current:.....................................max. 12mA
Frequency (f1/ f2)........................................... 127Hz/ 140Hz
Measurement method:................................... 2 pole, 3 pole, 4 pole
Tolerance:
RE: ................................................................. 0.05 - 2.00 Ohm ±(4% + 0.1 Ohm)
RE: ................................................................. 2.00 - 1999 Ohm ±(4% + 2 Digit)
RH, RS: .......................................................... 0.1 - 50 kOhm
IM: ..................................................................0.1 - 13mA
*Instrument error
Nominal use range:
Correct polarity:.............................................. for 3/4 pole measurements
Disturbance voltage:........................................0...5V, max. 10% of measurement voltage
RH, RS:...........................................................max. 50 kOhm
Ratio RH/ RE:..................................................max. 1000/1
Ratio RS/ RE:...................................................max. 10000/1
RE:..... .............................................................max. 2 KOhm
Reference range:
Correct polarity:...............................................for 3/4 pole measurements
Disturbance voltage:........................................0 V
Temperature ranges: ......................................+17°C...+27°C
RH,RS:.............................................................0 Ohm
RE:...................................................................max. 2 kOhm
26
in accordance with EN61557-5
max. 500mA briefly, during measurement
±(6% + 0.1 Ohm)*
±(6% + 3 Digit)*
±(10% + 3 Digit)*
±(10% + 3 Digit)*