Keithley 2700 User Manual

Model 2700 Multimeter/Switch System User’s Manual Temperature Equations F-9
RTD parameters for equations
The RTD parameters for the Callendar-Van Dusen equations are listed in Table F-10.
Example 1
Calculate the resistance of a PT100 RTD at 100°C (T). The following R
0
(Ω at 0°C), alpha,
and delta values are used for the PT100 RTD (
Table F-10):
T = 100°C
R
0
(Ω at 0°C) = 100Ω
alpha = 0.003850
delta = 1.49990
Using the above alpha and delta values, A and B are calculated as follows:
A = 0.00385 [1 + (1.4999/100)]
= 0.00385 (1.014999)
= 0.003907746
B = -1 (0.00385)(1.4999)(1e-4)
= -1 (0.005774615)(1e-4)
= -5.774615e-7
The resistance of the RTD at 100°C (R
100
) is then calculated as follows:
R
100
= R
0
[1 + AT + BT
2
]
= 100 {1 + [(0.003907746)(100)] + [(-5.774615e-7)(100
2
)]}
= 100 [1 + 0.3907746 + (-0.005774615)]
= 100 (1.385)
= 138.5Ω
Table F-10
RTD parameters
Type Standard Alpha Beta Delta Ω at 0°C
PT100 ITS-90 0.003850 0.10863 1.49990 100Ω
D100 ITS-90 0.003920 0.10630 1.49710 100Ω
F100 ITS-90 0.003900 0.11000 1.49589 100Ω
PT385 IPTS-68 0.003850 0.11100 1.50700 100Ω
PT3916 IPTS-68 0.003916 0.11600 1.50594 100Ω

Keithley 2700 Specifications

General

Type	Digital Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Temperature Range	-200°C to +1372°C
Display	Vacuum Fluorescent Display
Connectivity	IEEE-488, RS-232
Channels	10
Power Supply	100V to 240V AC, 45Hz to 66Hz
DC Current Range	10 µA to 3 A
AC Current Range	10 µA to 3 A
Temperature Measurement	Thermocouple, RTD