Section 4: Basic DMM operation
Series 3700A System Switch/Multimeter Reference Manual
4-22
3700AS-901-01 Rev. D/June 2018
Resistance measurements through remote interface
Examples of remote interface measurements setups through the remote interface are shown here.
dmm.func = "twowireohms"
dmm.autodelay = dmm.ON
dmm.measurecount = 10
ReadingBufferOne = dmm.makebuffer(1000)
dmm.measure(ReadingBufferOne)
An automatic delay is applied to each
measurement when the DMM is measuring
two-wire ohms. Take 10 measurements and
store them in a reading buffer named
ReadingBufferOne that can store up to 1000
readings.
dmm.func = "fourwireohms"
dmm.autodelay = dmm.AUTODELAY_ONCE
dmm.measurecount = 10
ReadingBufferTwo = dmm.makebuffer(1000)
dmm.measure(ReadingBufferTwo)
Sets an autodelay for the first of the ten four-
wire ohm readings. Readings two through
ten occur as quickly as possible, with
readings stored in a reading buffer called
ReadingBufferTwo that can store up to 1000
readings.
Temperature measurements
The Series 3700A can measure temperature using various thermoelectric transducers, including
thermocouples, thermistors, and resistance temperature detectors (RTDs).
When deciding which type to use, note that the thermocouple is the most versatile and useful for
significant distances between the sensor and the instrument, the thermistor is the most sensitive, the
4-wire RTD is the most stable, and the 3-wire RTD minimizes the number of conductors per
sensor (3).
Settings available for temperature measurements
•
aperture (range of 10 µs to 0.250 s for 50 Hz; 8.33 µs to 0.250 s for 60 Hz)
•
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)
•
filter count (1 to 100)
•
filter enable (
dmm.ON
or
dmm.OFF
)
•
filter type (
dmm.FILTER_MOVING_AVG
or
dmm.FILTER_REPEAT_AVG
)
•
filter window (0 to 10%)
•
Four-wire RTD (
dmm.RTD_PT100
,
dmm.RTD_D100
,
dmm.RTD_F100
,
dmm.RTD_PT385
,
dmm.RTD_PT3916
,
dmm.RTD_USER
) (only with
dmm.transducer
set to
dmm.TEMP_FOURRTD
)
•
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)
