Chapter 3 Configuring for Measurements 55
DC voltage measurements on the 1V range, send:
OUTPUT 722;"DCV 1"
* 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.
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
DCV Range Full Scale Reading Maximum Resolution Input Resistance
100mV 120.00000mV 10nV
>10GW*
1V 1.20000000V 10nV
>lOGW*
10V 12.0000000V 100nV
>lOGW*
100V 120.000000V 1µV 10MW
1000V 1050.00000V 10µV 1OMW
Figure 11. Voltage measurement connections
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