HT COMBITEST422, Руководство пользователя

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COMBITEST422
EN - 54
6.7.2. Test cable calibration (ZEROLOOP)
In order to obtain better results, it is strongly recommended to perform the preliminary
calibration of the test cables or of the cable with mains plug by using the
ZEROLOOP
accessory before performing the test. In this way, the instrument automatically subtracts
the resistance of the test cables, providing the actual result on the display. By way of
example, the procedure for the LOOP STD Generic mode is described below and can be
extended to all other cases.
1. Press the MENU key, move the cursor to LOOP in the
main menu by means of the arrow keys (

,

) and
confirm with ENTER .
Select the function “
CAL
”.
Subsequently, the instrument displays a screen similar to
the one reported here to the side.
L O O P 15/10
– 18:04
TN
RL
RN
RPE
=
=
= - - -
- - -
- - -



FREQ. = 0.00Hz
VL-PE=0V
VL-N=0V
CAL
FUNC
2. Insert the
ZEROLOOP metallic accessory into the three banana connectors of the
measurement cables (L-N-PE) or into the metal connectors of the mains plug (differently
for the various types depending on the country of use), as shown in the following Table
2: Connection of ZEROLOOP accessory
3. .
Test
leads
SHUKO
plug
UK
,ains plug
ITA
plug
SWI
plug DEN
plug
AUS/CHN
plug
USA
plug
Table 2: Connection of ZEROLOOP accessory
3. Press the GO/STOP key to start calibration. In the RL , RN
and RPE field, the resistance of test leads is shown for a
few seconds. This value will automatically be subtracted
by the instrument at the end of Loop measurement.
The i
nstrument displays the “ ” symbol to indicate the
positive outcome of teast leads
’ calibration (
Rcal <1

)
and the screen to the side appears on the display.
Go
back to the measurement main screen. Note the “ ”
symbol which means the successful test leads
’ calibration
and proceed with the measurements described in the
following paragraphs.
L O O P 15/10
– 18:04
TN
RL
RN
RPE
=
=
= 0.051
0.013
0.068



FREQ. = 0.00Hz
VL-PE=0V
VL-N=0V
Zeroing OK
CAL
FUNC