Keithley 2700 User Manual

F-2 Temperature Equations Model 2700 Multimeter/Switch System User’s Manual
Thermocouple equation
The Model 2700 uses the ITS-90 inverse function coefficients for the polynomial to
calculate thermocouple temperature. The Model 2700 measures the thermocouple voltage,
and then calculates temperature (in °C) as follows:
t
90
= c
0
+ c
1
E + c
2
E
2
+ c
3
E
3
... c
i
E
i
where: t
90
is the calculated temperature in °C.
c
0
, c
1
, c
2
, c
3
... c
i
are the coefficients for the thermocouple type.
E is the thermocouple voltage in microvolts (µV).
The coefficients for each thermocouple type are listed in Table F-1 through Table F-8.
Table F-1
Type B inverse function polynomial
250ºC to 700ºC
(291µV to 2,431µV)
700ºC to 1,820ºC
(2,431µV to 13,820µV)
c
0
=
c
1
=
c
2
=
c
3
=
c
4
=
c
5
=
c
6
=
c
7
=
c
8
=
Error:
9.842 332 1 × 10
1
6.997 150 0 × 10
-1
-8.476 530 4 × 10
-4
1.005 264 4 × 10
-6
-8.334 595 2 × 10
-10
4.550 854 2 × 10
-13
-1.552 303 7 × 10
-16
2.988 675 0 × 10
-20
-2.474 286 0 × 10
-24
0.03°C to -0.02°C
2.131 507 1 1 × 10
2
2.851 050 4 1 × 10
-1
-5.274 288 7 1 × 10
-5
9.916 080 4 1 × 10
-9
-1.296 530 3 1 × 10
-12
1.119 587 0 1 × 10
-16
-6.062 519 9 1 × 10
-21
1.866 169 6 1 × 10
-25
-2.487 858 5 1 × 10
-30
0.02°C to -0.01°C
t
90
= c
0
+ c
1
E + c
2
E
2
+ c
3
E
3
... c
i
E
i
where: t
90
is the calculated temperature in °C.
E is the measured voltage in microvolts.

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