RS-485 Port Protection Evaluation Board 1
Performance Graphs
Run
Trig’d
PreVu
Trig?
T
T
T
T
1
2
4
Ch1 RMS
126.7 V
Ch1 Max
508 V
1
4
Ch4 Max
371.2 mA
Ch4 Min
-359.9 mA
Ch4 Max
1.74 A
Ch1 200 V
Ch2
Ch4
20.0 V
200 mAΩ
M 2.00 ms A Line
-3.98 V
Ch1 200 V
M
200 ns
A
Ch1
-172 V
Ch4
1.00 AΩ
T
27.20 %
T
31.00 %
Ch 1: Surge generator
Ch 1: AC power generator
Ch 2: Voltage on protected side of world (downstream
of TBU® device at SMBJ12CA TVS diode side)
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
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 2: Consumed current (TBU® HSP Trigger current)
Note: The noise generated by the GDT when it fires
causes a ground bounce and is reflected in current
measurement at the time the GDT device is triggered.
Ch 4: Current consumed (TBU® HSP trigger current)
Figure 3
Power Cross 120 V
Figure 4
Slew Rate 1 KV/µs
rms
Reference
PreVu
T
T
For more information on implementing advanced circuit
protection technologies for RS-485 ports, please review the
Bourns® RS-485 application note:
1
Ch1 Max
625 V
http://www.bourns.com/data/global/pdfs/Bourns_RS-485_AppNote.pdf
Ch4 Max
1.64 A
4
Ch1 200 V
M
200 ns
A
Ch1
312 V
Ch4
1.00 AΩ
T
30.40 %
Ch 1: Surge generator
For further technical support
and for complete circuit protection solutions,
please visit
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 2: Consumed current (TBU® HSP Trigger current)
Note: The noise generated by the GDT when it fires
causes a ground bounce and is reflected in current
measurement at the time the GDT device is triggered.
Figure 5
Slew Rate 5 KV/µs
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“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.
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