Test Lead Compensation "Comp; U Protection Level Function - BEHA UNITEST TELARIS ISO plus Manual De Instrucciones

PTDB90690001.qxd:PTDB9069-02.qxd
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-Ω".
Connect the black test lead to the "COM"
socket and the red test lead to the "LOW-Ω"
socket.
Short-circuit both test leads connected.
Press the "COMP" key (26).
The measurement is started. The test lead re-
sistance is measure and compensated. The
"COMP" symbol (7) is displayed. 0,00 Ω ap-
pears on the display and an acoustic signal
is audible
If a value exceeding 1.99 Ω is measured, no
test lead compensation is carried out. In lieu of
the measurement ">1.99 Ω" is displayed to-
gether with the respective symbol and a dou-
ble acoustic signal is audible.
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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).
The ‚AC DC' key ( 17) is used to choose between
the measurement result display as DC or as AC
voltage.
The measurement value displayed after com-
pleted measurement can be saved pressing the
'Save' key (21) .
The instrument is resistant against external
voltages up to a value of 1200 V.
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