TISP1072F3, TISP1082F3
DUAL ASYMMETRICAL TRANSIENT
VOLTAGE SUPPRESSORS
SEPTEMBER 1993 - REVISED SEPTEMBER 1997
APPLICATIONS INFORMATION
longitudinal balance
Figure 22 shows a three terminal TISP with its equivalent "delta" capacitance Each capacitance, C
, C
RG
TG
and C , is the true terminal pair capacitance measured with a three terminal or guarded capacitance bridge.
TR
If wire R is biased at a larger potential than wire T then C > C . Capacitance C is equivalent to a
TG
RG
TG
capacitance of C
in parallel with the capacitive difference of (C - C ). The line capacitive unbalance is
RG
TG RG
due to (C - C ) and the capacitance shunting the line is C + C /2 .
TG
RG
TR
RG
Figure 22.
All capacitance measurements in this data sheet are three terminal guarded to allow the designer to
accurately assess capacitive unbalance effects. Simple two terminal capacitance meters (unguarded third
terminal) give false readings as the shunt capacitance via the third terminal is included.
P R O D U C T
I N F O R M A T I O N
12
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