7½ Digit Graphical Sampling Multimeter Reference Manual Section 8:
DMM7510-901-01 Rev. B / May 2015 8-85
dmm.digitize.coupling.acfilter
This attribute selects the instrument settling time when coupling is set to AC.
Type TSP-Link accessible Affected by Where saved Default value
Instrument reset
Power cycle
Measure configuration list
Measure configuration list
Usage
type = dmm.digitize.coupling.acfilter
dmm.digitize.coupling.acfilter = type
Type of AC coupling filter:
• Slow (800 ms): dmm.AC_FILTER_SLOW
• Fast (80 ms):
Functions
dmm.FUNC_DIGITIZE_CURRENT
dmm.FUNC_DIGITIZE_VOLTAGE
Details
This option is only used when digitize signal coupling is set to AC.
When the signal coupling is set to AC, there may still be some DC signal content that comes in with
the AC signal. To allow this signal to settle out, you can set AC coupling filter to slow. When the filter
is set to slow, the instrument adds an 800 ms delay before making measurements.
When the AC coupling filter is set to fast, the instrument adds an 80 ms delay before making
measurements. Set the AC filter to fast for faster settling when measuring rapidly changing inputs.
For most digitize voltage measurements, the 80 ms delay is enough time for the range to settle.
Example
dmm.digitize.func = dmm.FUNC_DIGITIZE_VOLTAGE
dmm.digitize.coupling.type = dmm.COUPLING_AC
dmm.digitize.coupling.acfilter = dmm.AC_FILTER_FAST
Set the measure function to digitize voltage.
Set the coupling type to AC.
Also see
DC and AC coupling (on page 2-132)
dmm.digitize.coupling.acfrequency (on page 8-86)
dmm.digitize.coupling.type (on page 8-87)
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