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4349B
Wait Time
When the test voltage is di erent from the precharge voltage, a wait time is required
regardless of performance of the high resistance meter. The wait time t
follows:
where,
R
: source resistance [
],
s
R
: input resistance [
],
i
X : measurement error [%],
K : (Test voltage
For example, when Rs is 1 k
(=10
and K is 0.1, the wait time is,
Figure 6-8. Wait Time
2
t
= C
( R
+ R
w
x
s
Charge voltage) / Test voltage
), Cx : 1 F (=10
3
2
t
= 10
(10
+ 10
6
3
w
X
R
+ R
2
2
)
ln (
s
100
R
i
x
F), Rx : 1 G
(=10
-6
10
10
+ 10
3
2
2
)
ln (
3
100
10
= 26 : 2[ ms ]
is calculated as
w
1
2
)
i
K
), X is 10%,
9
1
3
2
)
0 : 1
9
Application Measurement
6-13
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