Resistance - Agilent Technologies 3458A User Manual

Resistance

56 Chapter 3 Configuring for Measurements
OUTPUT 722;"DCI 10E-6"
DCI Range Full Scale Reading
lOOnA 120.000nA
1µA 1.200000µA
10µA 12.000000µA
100µA 120.00000µA
1mA 1.2000000mA
10mA 12.000000mA
100mA 120.00000mA
1A 1.0500000A
Figure 12. Current measurement connections
The multimeter measures resistance by supplying a known current through
the unknown resistance being measured. The current passing through the
resistance generates a voltage across it. The multimeter measures this voltage
and calculates the unknown resistance (resistance = voltage/current). Table
14 shows each 2-and 4-wire ohms range and its full-scale reading (the full
scale reading also shows the maximum number of digits for each range).
Table 14 also shows the maximum resolution and current sourced for each
range. (Resolution is a function of the specified integration time: refer to
Setting the Integration Time later in this section for more information.)
OHM(F) Range Full Scale Reading
10W 12.00000W
100W 120.00000W
1kW 1.2000000kW
10kW 12.000000kW
100kW 120.00000kW
1MW 1.2000000MW
Table 13: DC Current Ranges
Maximum Resolution
1pA
1pA
1pA
10pA
lOOpA
1nA
10nA
100nA
Table 14: Resistance Ranges
Maximum Resolution
10mW
10µW
100µW
1mW
10mW
100mW
Shunt Resistor
545.2kW
45.2kW
5.2kW
730W
100W
10W
1W
0.1W
Current Sourced
10mA
1mA
1mA
l00µA
50µA
5µA