Keithley 3721-ST User Manual

Section 4: Basic DMM operation Series 3700A System Switch/Multimeter Reference Manual
4-42 3700AS-901-01 Rev. D/June 2018
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
Ranges and delays
Frequency and
periods
Range
100 mV
1 V
10 V
100 V
300 V
Autodelay
100 ms
Autorange
100 ms
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.

Keithley 3721-ST Specifications

General

Brand	Keithley
Model	3721-ST
Category	Multimeter
Language	English