Section 5: Basic Digital Multimeter (DMM) Operation
Series 3700 System Switch/Multimeter User's Manual
5-52
3700S-900-01 Rev. C / July 2008
VMEAS open voltage (dry-circuit)
If either Input Sense HI or Sense LO V
MEAS
is outside the enclosed table voltages,
the A/D will abort in <100 sec and return an overflow reading.
Range
V
MEAS
SHI or SLO High Limit
Open Lead Detection
V
MEAS
SHI or SLO Low Limit Open
Lead Detection
1
> 27mV
< -10mV
10 -2k
> 20mV
< -10mV
Calculated measurement open voltage (dry-circuit)
A calculated measurement, which exceed 120% of the range, will return an
overflow reading.
NOTE
1. INPUT Sense HI is internally connector to INPUT HI. The
connection allows proper open circuit voltage, even with Sense HI
disconnected. With INPUT Sense HI disconnected, and the other
inputs properly connected, the measurement will read the V
DUT
and
R
LEADVOLTAGE
drop.
2. For
dmm.drycircuit = dmm.ON
and
dmm.opendetector =
dmm.ON
, IOPENLEAD will be disabled, but a
print(dmm.opendetector)
will still return 1.0.
Temperature measurements
The Series 3700 can measure temperature using various thermoelectric
transducers including: thermocouples, thermistors, and 3 or 4-wire 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).
Thermocouples
For thermocouples, temperature measurement range depends on which type of
thermocouple is being used. Thermocouples that are supported include types J,
K, N, T, E, R, S, and B.
Type
Range
Resolution
J
-200°C to +760°C
0.001°C
K
-200°C to +1372°C
0.001°C
N
-200°C to +1300°C
0.001°C