Settings Available For Frequency And Period Measurements; Autodelay And Autorange Settings; Trigger Level - Keithley 3700A Series Reference Manual

Section 4: Basic DMM operation

Settings available for frequency and period measurements

•
aperture (range of 0.01 s to 0.273 s)
•
autodelay (dmm.AUTODELAY_ONCE, dmm.ON or dmm.OFF)
•
autozero (dmm.AUTOZERO_ONCE, dmm.ON or dmm.OFF)
•
display digits (3, 4, 5, 6, or 7)
•
DMM limit auto clear (dmm.ON or dmm.OFF)
•
DMM limit enable (dmm.ON or dmm.OFF)
•
DMM limit high fail (0 or 1)
•
DMM limit high value (–4294967295 to +4294967295)
•
DMM limit low fail (0 or 1)
•
DMM limit low value (–4294967295 to +4294967295)
•
math enable (dmm.ON or dmm.OFF)
•
math format (dmm.MATH_NONE, dmm.MATH_MXB, dmm.MATH_PERCENT, or
dmm.MATH_RECIPROCAL)
•
math mxb b factor (–4294967295 to +4294967295)
•
math mxb m factor (–4294967295 to +4294967295)
•
math mxb units
•
math percent (–4294967295 to +4294967295)
•
relative offset enable (dmm.ON or dmm.OFF)
•
relative offset level
•
threshold (0 to 303 V)

Autodelay and autorange settings

The following table provides times for autodelay and autorange time for the Series 3700A DMM
frequency and period functions.
Function
Frequency and
periods

Trigger level

Frequency and period use a zero-crossing trigger, which means that a count is taken when the
frequency crosses the zero level. The Series 3700A uses a reciprocal counting technique to measure
frequency and period. This method generates constant measurement resolution for any input
frequency. The AC voltage measurement section of the Series 3700A performs input signal
conditioning. If the input signal voltage exceeds the selected voltage range, 000.0000 mHz
(0.000000 s) is returned.
4-42
Ranges and delays
100 mV 1 V
Range
Autodelay
Autorange
Series 3700A System Switch/Multimeter Reference Manual
10 V 100 V 300 V
100 ms
100 ms
3700AS-901-01 Rev. D/June 2018