Dc Current - Agilent Technologies 3458A User Manual

DC voltage measurements on the 1V range, send:
OUTPUT 722;"DCV 1"
DCV Range
100mV
1V
10V
100V
1000V
* With FIXEDZ OFF. With FIXEDZ ON the input resistance is fixed at 10MW.
Refer to Fixed Input Resistance later in this chapter for more information.
Figure 11. Voltage measurement connections

DC Current

The multimeter measures current by placing an internal shunt resistor across
the input terminals, measuring the voltage across the resistor, and calculating
the current (current = voltage/resistance). The multimeter's front and rear
current inputs are protected by 1 A, 250V fuses. Figure 12 shows the front
terminal connections for all types of current measurements.
The multimeter measures DC current on any of eight ranges. Table 13 shows
each DC current range and its full-scale reading (the full scale reading also
shows the maximum number of digits for each range). Table 13 also shows
the maximum resolution and the shunt resistor used for each range.
(Resolution is a function of the specified integration time: refer to Setting
the Integration Time later in the section for more information.) You specify
DC current measurements using the DCI command. For example, to specify
DC current measurements on the 10µA range, send:
Table 12: DC Voltage Ranges
Full Scale Reading Maximum Resolution
120.00000mV 10nV
1.20000000V 10nV
12.0000000V 100nV
120.000000V 1µV
1050.00000V 10µV
Chapter 3 Configuring for Measurements
Input Resistance
>10GW*
>lOGW*
>lOGW*
10MW
1OMW
55