7 Operating Instructions
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7-1
7 Operating Instructions
7.1 DC Voltage Measurement
Input Resistance in DC Voltage
To make use of the high linearity of the measurement process, the input resistance for
voltage measurements up to 3V is set very high (>10G
Ω
). In this range, the unit al-
lows precise measurements, with a maximum load error of 1ppm, even at measure-
ment objects with an internal resistance of 1k
Ω
.
In the 30V, 300V, and 1,000V ranges, for example, and with a 100
Ω
internal resis-
tance in a measurement object with a resolution of 100,000, a corresponding error of
one digit step occurs.
The values of the input resistance in the individual measurement ranges, and the
maximum display ranges, are shown in the following table:
Full
Input
Maximum
Range
Scale
Resistance
Resolution
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300 mV
30 100 000
10 G
Ω
10
nV
3 V
30 100 000
10 G
Ω
100
nV
30 V
30 100 000
10 M
Ω
1 µV
300 V
30 100 000
10 M
Ω
10 µV
1000 V
10 100 000
10 M
Ω
1 mV
