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Measurements
6.2.1 Test Lead Compensation
The TELARIS ISO plus allows the compensation of
the test lead resistance and the additional mea-
surement accessories. Proceed as follows:
@
Set the measurement function selection dial
(19) to measurement function "LOW-
".
@
Connect the black test lead to the "COM"
socket and the red test lead to the "LOW-
"
socket.
Short-circuit both test leads connected.
Press the "COMP" key (26).
The measurementis started. The test lead re-
sistance is measure and compensated. The
"COMP" symbol (7) is displayed. 0,00
ap-
pears on the display and an acoustic signal
is audible
Riso
COM
Low2
Vace
See
0000
A owe an. A car m
DS If a value exceeding 1.99
is measured, no
test lead compensation is carried out. In lieu of
the measurement ">1.99
" is displayed to-
gether with the respective symbol and a dou-
ble acoustic signal is audible.
IS To delete the test lead compensation, press
again the "COMP" key (26). The "COMP" sym-
bol disappears.
6.3 Function UProtection Level
The TELARIS ISO plus allows the measurement of
the protection level or the response voltage of over-
voltage protection devices.
The measurement consists in the DC voltage mea-
surement. The resulting DC value agrees with the
actually measured DC voltage.
Signification of AC voltage value:
The AC value displayed agrees with the rms value of
the AC voltage allowing the connection of verified
overvoltage protection devices.
To calculate the maximum AC voltage, a safety fac-
tor of approx. 14 % is considered, resulting in the
formula UAC = UDC/ 1.6.
A measurement may only be carried out on
system parts not being live!!
During protection level measurement, all loads
must be disconnected from the mains.
@®
To carry out this measurement, connect the
overvoltage protection module to ‚Riso' and
,COM' sockets.
@
Set the measurement function selection dial
(19) to position UProtection Level.
@
Start the measurement pressing the "Start"
key (20).
IS The,ACDC key ( 17) is used to choosebetween
the measurement result display as DC or as AC
voltage.
DS The measurement value displayed after com-
pleted measurement can be saved pressing the
'Save' key (21) .
DS The instrument is resistant against external
voltages up to a value of 1200 V.
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