66 Chapter 3 Configuring for Measurements
LEVEL command in Chapter 6 for more information.
The following program configures the multimeter for frequency
measurements on the 10V range from a voltage Source. The input signal is
AC-coupled.
10 OUTPUT 722;"FREQ 10"
20 OUTPUT 722;"FSOURCE ACV"
30 END
The following program configures the multimeter for period measurements
on the 10mA range from a current source. The input signal is DC-coupled.
10 OUTPUT 722;"PER 10E-3"
20 OUTPUT 722;"FSOURCE ACDCI"
30 END
Note You can reduce high-frequency noise above 75kHz for frequency or period
measurements by enabling the level filter. Refer to the LFILTER command
in Chapter 6 for details.
Specifying
Bandwidth
The ACBAND command specifies the frequency content of the input signal
for all AC and AC+DC measurements. Specifying the frequency content
allows the multimeter to make accurate measurements and to configure itself
for the fastest possible measurements. The ACBAND command's first
parameter specifies the lowest expected frequency component (the
power-on/PRESET NORM value is 20Hz). The second parameter specifies
the highest expected frequency component (the power-on/PRESET NORM
value is 2MHz). For example, suppose the input signal has a frequency range
of 750 Hz to 2 kHz; you should send:
OUTPUT 722;"ACBAND 750,2000"
Refer to the Specifications in Appendix A for accuracy specifications (and
reading rate specifications for analog AC measurements) based on the
frequency components of the input signal.
Note For synchronous AC or AC + DC voltage measurements, the bandwidth
parameters are used by the multimeter to calculate time-out values and
sampling parameters. For frequency or period measurements with
autorange enabled, the bandwidth parameters are used to determine the
amount of time needed for autoranging. For these measurements, it is very
Table 17: FSOURCE Parameters
FSOURCE
Parameter
Definition Measurement Capabilities
Frequency Period
ACV AC-coupled AC voltage input 1Hz — 10MHz 100ns — 1s
ACDCV DC-coupled AC voltage input 1Hz — 10MHz 100ns — 1s
ACI AC-coupled AC current input 1Hz — 100kHz 10ms — 1s
ACDCI DC-coupled AC current input 1Hz — 100kHz 10ms — 1s
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