Service manual

Leakage Test Conditions:
• DC Volts function, 100 mV range
• 90 day specifications
• Worst case reading = 0.01 V
• Resistor value: 99 kΩ < R < 101 kΩ
• Power supply value: 9.9 Vdc < PS < 10.1 Vdc
3458 Uncert = (5 ppm of Reading + 10 ppm of Range)
=((5 X 10
-6
* 0.01) + (10 X 10
-6
* 0.1))
= 1.05 X 10
-6
Volts
Resistor Uncert =
(
10
10
8
+ R
MAX
∗ R
MAX
)
−
(
10
10
8
+ R
MIN
∗ R
MIN
)
= ( 1.008 X 10
−2
) − ( 9.89 X 10
−3
)
=1.99 X 10
−4
Volts
Power Supply Uncert =
(
PS
MAX
1.001 X 10
8
∗ 10
5
)
−
(
PS
MIN
1.001 X 10
8
∗ 10
5
)
= ( 1.008 X 10
−2
) − ( 9.89 X 10
−3
)
= 1.99 X 10
−4
Volts
MU = 3458A Uncert + Resistor Uncert + Power Supply Uncert
= ( 1.05 X 10
-6
) + ( 1.99 X 10
-4
) + ( 1.99 X 10
-4
)
= 3.99 X 10
-4
Volts
Test Accuracy
Ratio (TAR)
Test Accuracy Ratios (TAR) are not defined for single-ended
measurements, so all closed channel resistance and leakage current tests
show NA (Not Applicable) in the TAR column.
Verification Tests 2-23