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RS-485 Port Protection Evaluation Board 1
Performance Graphs
Run
T
Trig’d
PreVu
T
Trig?
1
T
Ch1 RMS
T
Ch1 Max
2
126.7 V
Ch4 Max
371.2 mA
Ch4 Min
1
508 V
Ch4 Max
4
-359.9 mA
4
1.74 A
Ch1
200 V
Ch2
20.0 V
M 2.00 ms
A Line
-3.98 V
Ch1
200 V
M 200 ns
A Ch1
-172 V
Ch4
200 mA?
T 27.20 %
Ch4
1.00 A?
T 31.00 %
Ch 1: AC power generator
Ch 2: Voltage on protected side of world (downstream
of TBU? device at SMBJ12CA TVS diode side)
Ch 4: Current consumed (TBU? HSP trigger current)
The ohm unit following the current units
shown for Channel 4 (i.e. AOhm)
indicates that a 50 ohm termination was
used internal to the oscilloscope
Ch 1: Surge generator
Ch 2: Consumed current (TBU? HSP Trigger current)
Note: The noise generated by the GDT when it ?res
causes a ground bounce and is re?ected in current
measurement at the time the GDT device is triggered.
The ohm unit following the current units
shown for Channel 4 (i.e. AOhm)
indicates that a 50 ohm termination was
used internal to the oscilloscope
Figure 3
Power Cross 120 V rms
Figure 4
Slew Rate 1 KV/μs
PreVu
T
T
Reference
For more information on implementing advanced circuit
protection technologies for RS-485 ports, please review the
1
Ch1 Max
625 V
Bourns? RS-485 application note:
http://www.bourns.com/data/global/pdfs/bourns_cpk1047_
rs485_circuit_protection_appnote.pdf
Ch4 Max
1.64 A
4
Ch1
200 V
Ch4
1.00 A?
M 200 ns
T 30.40 %
A Ch1
312 V
Ch 1: Surge generator
Ch 2: Consumed current (TBU? HSP Trigger current)
Note: The noise generated by the GDT when it ?res
causes a ground bounce and is re?ected in current
measurement at the time the GDT device is triggered.
The ohm unit following the current units
shown for Channel 4 (i.e. AOhm)
indicates that a 50 ohm termination was
used internal to the oscilloscope
For further technical support
and for complete circuit protection solutions,
please visit
Figure 5
Slew Rate 5 KV/μs
www.bourns.com
“TBU” is a registered trademark of Bourns, Inc. in the U.S., Taiwan and European Community.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
10/12 ? FU1213
COPYRIGHT? 2012 ? BOURNS, INC. ? 10/12 ? e/FU1213
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