Chapter 3 Configuring for Measurements 65
measures the DC component and the AC component with frequencies >
10Hz. Notice that when measuring AC+DC current, any AC components
below 10Hz are not included in the measurement. The maximum resolution
for AC or AC+DC current is 6½, digits. Table 16 shows each current range
and its full scale reading, maximum resolution, and the shunt resistor used.
(Resolution is a function of the specified integration time; refer to Setting
the Integration Time, later in this section, for more information.) You specify
AC current measurements using the ACI command or AC+DC current
measurements using the ACDCI command. For example to specify AC
current measurements on the 100µA range, send:
OUTPUT 722;"ACI 100E-6"
To specify AC+DC current measurements on the 10mA range, send:
OUTPUT 722;"ACDCI 10E-3"
Frequency or Period The multimeter's frequency and period counter accepts AC voltage or AC
current inputs. The maximum resolution is 7 digits
1
for both frequency and
period measurements. (Refer to Specifying Resolution later in this section,
for more information).
You specify frequency measurements using the FREQ command or period
measurements using the PER command. For frequency or period
measurements you must also specify whether the input signal is from a
voltage source or a current source and whether the measurements will be AC
or DC coupled. This is done using the FSOURCE command (the
power-on/default value is ACV). Table 17 shows the FSOURCE parameters,
the type of input specified by each, and the measurement capabilities of each.
The terminal connections for frequency or period measurements from a
voltage source are shown in Figure 11. The terminal connections for
frequency or period measurements from a current source are shown in Figure
11.
Note The LEVEL command affects the zero crossing threshold and the input
signal coupling for frequency and period measurements. Refer to the
Table 16: AC and AC+DC Current Ranges and Resolution
ACI Range Full Scale Reading Maximum Resolution Shunt Resistor
l00µA 120.0000µA lOOpA 730W
1mA 1.200000mA 1nA 100W
10mA 12.00000mA 10nA 10W
100mA 120.0000mA 100nA 1W
1A 1.050000A 1µA 0.1W
1. The leftmost digit, which is a ½ digit for most measurement functions is a full digit (0-9) for frequency and
period measurements.
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