Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 10 of 45
1.3 Functional Performance
1.3.1 Instrumentation
Instrument Value Reference Typical accuracy
I
Current
I t 0.1 xIn r 1 % In
V
Voltage
V t 0.8 xVn r 1 % Vn
1.3.2 USB Data Communication Interface
Attribute Value
Physical layer Electrical
Connectors USB-Type B
1.3.3 Fibre optic Data Communication Interface
Attribute Value
Physical layer Fibre-optic
Connectors ST
TM
(BFOC/2.5)
Recommended fibre
62.5/125 Pm glass fibre with ST connector
Launch power (into recommended fibre) -16 dBm
Receiver sensitivity -24 dBm
1.3.4 RS485 Data Communication Interface
Attribute Value
Physical layer Electrical
Connectors 4mm Ring Crimp
1.3.5 Real Time Clock
1.3.5.1 Internal Clock
The specification below applies only while no external synchronisation signal (e.g. IRIG-B, IEC 60870-5-103) is
being received.
Attribute Value
Accuracy (-10 to +55
o
C)
r 3.5 ppm
1.3.5.2 IRIG-B
Attribute Value
Connector BNC
Signal Type IRIG-B 120, 122 or 123
Applied signal level minimum 3 V, maximum 6 V, peak-to-peak
Signal : carrier ratio
t 3