Operation
24
Testboy
®
TV 441
(3) Measuring the earth resistance
Turn the rotary switch to 3POL and press the MEASURE button. The button illuminates during the active
measurement. A signal tone sounds after the measurement has come to an end and the LED extinguishes.
The data are displayed automatically.
Caution:
If > LIMIT 4000 Ω is displayed on the LCD, this means that the auxiliary resistance of the auxiliary earthing rods
is so high that the current cannot flow through the measuring instrument. Check whether the test leads have
disconnected and the level of the earth resistance of the auxiliary earthing rod. Should the test leads be turned
together or in contact during measurement, this will produce measurement errors. Ensure that the test leads are
not in contact during measurement. Too high an auxiliary resistance results in unacceptable measurement errors.
Ensure that the auxiliary earthing rods P and C are deeply in the damp soil and are have been connected correctly.
Saving data
The measuring instrument can save up to 100 groups of measured data which are retained after interruption of the
power supply.
(1) Working in standby, press “MEMO” to access the data storage display. MEMO will illuminated on the bottom
right-hand of the LCD. If the available memory is already full, USED will illuminate. Press “MEMO” again to leave
data saving.
(2) Pressing “ENTER” for a short time enables you to move between the “1” and “10” positions; you can page
through using “
” or “
”.
(3) Press “ENTER” for 5 seconds to save a data group. Any data already saved on the selected memory will be
overwritten.
Reading out data
Reading out data enables you to check of the earlier measurements saved in the measuring instrument.
(1) Working in standby, press “MEMO” to access the data storage display. MEMO will illuminated on the bottom
right-hand of the LCD. If the available memory is already full, USED will illuminate. Press “MEMO” again to leave
data saving.
(2) Pressing “ENTER” for a short time enables you to move between the “1” and “10” positions; you can page
through using “
” or “
”.
(3) Press “ENTER” for 5 seconds to read out a saved a data group.
REL
– Relative measurement
Relative measurement is only available when measuring the earth resistance. Pressing REL switches between
normal and relative measurement.
(1) In Relative measurement mode, the symbol “REL” is displayed on the LCD and the current measured value is
saved for later use. In the following relative measurement, the LCD shows the difference between the input value
and the reference value: displayed measured value = input value - reference value.
(2) It is not possible to change into REL mode during a running normal earth resistance measurement.
(3) It is not possible to change into REL mode whilst data is being read out or saved.
(4) It is not possible to change into REL mode if the current measured value lies over the limit value.
MAX/MIN/AVG measurement
Pressing the MAX/MIN/AVG button switches between the measuring modes Maximum, Minimum, Average or
Normal. The corresponding symbol is displayed on the LCD.
(1) If MAX has been selected, the LCD shows the maximum of all data.
(2) If MIN has been selected, the LCD shows the minimum of all data.
(3) If AVG has been selected, the LCD shows the average of all data.
