5: Basic Digital Multimeter (DMM) Operation Series 3700 System Switch/Multimeter
-12 Document Number: 3700S-900-
When detectorbandwidth = 300
For dmm.detectorbandwidth=300, the Series 3700 DMM is optimized for inputs from 300kHz,
(FAST). For ACI or ACV inputs 300Hz, the RMS converter is DC output. The A/D takes a
single measurement to determine the RMS measurement. For varying input signal levels, only
an 80msec delay is require to properly settle the RMS converter's filter capacitor. The Series
3700 DMM default detector bandwidth is 300.
Auto delay
Each DMM function and range has a unique auto delay. Auto delay is applied at the start of
measurement, allowing cables, Series 3700 cards, or internal DMM circuitry to settle for best
measurement accuracy. For ACI and ACV, the auto delay includes both the RMS filter and AC
coupling capacitor settling times.
Auto delay modes
Auto delay supports 3 modes:
dmm.OFF or 0
dmm.ON or 1
dmm.AUTODELAY_ONCE or 2.
For Off, the zero delay is applied at the start of measurement. For On, every start of
measurement delays the same amount of time. For Once, only the start of the first
measurement has the delay and each measurement there after has no additional delay. When
dmm.measurecount =1, ONCE acts similarly to On, applying a delay at the start of every
measurement.
Autodelay and Auto range settings
The following table provides times for autodelay and auto range time for the Series 3700 DMM
functions.
es
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