Sanwa PC20TK - Page 40

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6-2 Current measurement circuit
When the input current is 400 mA in Fig. 6-3, find electric shut resistor R in Ω with which the output
voltage of 400 mA is obtained. Create an equation to find R. Assume that the input resistance of
the LSI connected to the output connector is infinite (
).
6-3 Resistance measurement circuit
Assume that the output voltage is 0.5 V when resistor Rx under measurement is connected to the
input connector in Fig. 6-4. Find the value for Rx. (See Fig. 3-9 on page 15.) Also find Rx when the
output voltage is 0.2 V. As explained in item 2 under 6-1, the resistance between a and b in Fig. 6-4
is infinite (
), but the electric potential difference is 0.
Fig. 6-3
Output voltage
400 mA
Input voltage
400 mA
R
LSI
Fig. 6-4
Rx
Output voltage
(Vout)
a
b
LSI
0.5 V
Es=1 V
Rs=1 k£