Amprobe Telaris-ISO-PRO Insulation-Tester - Manual (Page 20)

Function U Protection Level
The ISO-PRO allows the measurement of the protection level or the response voltage of
overvoltage protection devices. The measurement consists in the DC voltage measurement.
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 factor of approx. 14 % is considered, resulting
in the formula UAC = UDC / 1.6.
WARNING
• 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.
1) To carry out this measurement, connect the overvoltage protection module to ‚Riso‘
and ‚COM‘ sockets.
2) Set the measurement function selection dial (19) to position UProtection Level.
3) 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 completed measurement can be saved pressing
the ‘Save’ key (21) .
• The instrument is resistant against external voltages up to a value of 1200 V.
18
PAEB30872322:Layout 1 02.10.2008 15:56 Uhr Seite 18