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RTD Measurements
To connect an RTD to the module’s screw terminals, see page 21.
• The instrument supports RTDs with α = 0.00385 (DIN / IEC 751)
using ITS-90 software conversions or
α = 0.00391 using IPTS-68
software conversions. The default is
α = 0.00385.
• The resistance of an RTD is nominal at 0 °C and is referred to as R
0
.
The instrument can measure
RTDs with R
0
values from 49Ω to 2.1 kΩ.
The default is R
0
= 100Ω.
• “PT100” is a special label that is sometimes used to refer to an
RTD with α = 0.00385 and R
0
= 100Ω.
• You can measure RTDs using a 2-wire or 4-wire measurement
method. The 4-wire method provides the most accurate way to
measure small resistances. Connection lead resistance is
automatically removed using the 4-wire method.
• For 4-wire RTD measurements, the instrument automatically pairs
channel n with channel n+10 (34901A) or n+8 (34902A) to provide
the source and sense connections. For example, make the source
connections to the
HI and LO terminals on channel 2 and the sense
connections to the
HI and LO terminals on channel 12.
• Front-Panel Operation: To select the 2-wire or 4-wire RTD function
for the active channel, choose the following items.
TEMPERATURE , RTD , RTD 4W
To select the nominal resistance (R
0
) for the active channel, choose
the following item.
Ro:100.000,0 OHM
To select the
RTD type (α = 0.00385 or 0.00391) for the active
channel, choose the following item.
ALPHA 0.00385
Chapter 4 Features and Functions
Temperature Measurement Configuration
110