Keithley 2001 User Manual

Front Panel Operation
3-49
of the elements needed and details on RTD calibration, refer
to NIST Technical Note 1265 "Guidelines For Realizing the
International Temperature Scale of 1990". In each subrange,
the calibration constants required for that range are listed.
An SPRTD as supplied from the manufacturer will come
with a certificate of calibration that lists the calibration
constants and the temperature range supported. In all cases
except subranges #4 and #7, translation of the supplied
coefficients to Model 2001 values will be required. In most
cases, this translation is done simply entering the A value
(for example) supplied with the SPRTD into the A4 position
(temperatures less than 0˚C) or A7 value (temperatures
above 0˚C) required by the Model 2001. The same procedure
is used for translating the B and, where applicable, C
constants.
Table 3-24 should be helpful in translating SPRTD
coefficients to Model 2001 SPRTD coefficients. The Model
2001 supports SPRTD temperatures between 83.805K and
933.473K. For any of the subranges below, only
temperatures within the range from 83.805K to 933.47K will
be measured.
Measurement Example: Suppose you are using an SPRTD
that has been calibrated for subrange #2 above, in which case
the RTD is calibrated for measurements between 24.5561
and 273.16K. The Model 2001, however, supports only
SPRTD temperatures down to 83.805K, so temperatures be-
low this value will be reported as an overflow even though
the SPRTD is capable of measuring lower. The calibration
certificate lists A2, B2, C1, C2, and C3 as the calibration co-
efficients. You can set up the Model 2001 for this measure-
ment as follows:
1. Set the temperature sensor type to be FRTD (4-wire
measurement) from the CONFIG/TEMP/SENSOR/
TYPE menu.
2. Choose the SPRTD RTD type using the CONFIG/
TEMP/SENSOR/TYPE/FRTD/SPRTD menu.
3. From the SPRTD COEFFICIENTS menu, set the RTD
0˚C resistance value and the following coefficients:
• Set the Model 2001 A4 coefficient to the RTD certifi-
cate A2 value.
• Set the Model 2001 B4 coefficient to the RTD certifi-
cate B2 value.
Note that the A7, B7, and C7 values will not be used for this
sensor.
4. Switch to the temperature function, and begin taking
readings.
Table 3-24
Translating SPRTD coefficients
Coefficients RTD coefficients to Model 2001 coefficients
Subrange #1: 13.8033K - 273.16K
Subrange #2: 24.5561K - 273.16K
Subrange #3: 54.3584K - 273.16K
Subrange #4: 83.8058K - 273.16K
Subrange #5: 234.3156K - 302.9146K
Subrange #6: 273.15K - 1234.93K
Subrange #7: 273.15K - 933.473K
Subrange #8: 273.15K - 692.677K
Subrange #9: 273.15K - 505.078K
Subrange #10: 273.15K - 429.7485K
Subrange #11: 273.15K - 302.9146K
Not applicable
A2 to A4, B2 to B4
A3 to A4, B3 to B4
No substitution needed
A5 to A4, A5 to A7, B5 to B4
B5 to B7, Set C7 = 0. A5 value entered for both A4 and A7;
B5 value entered for both B4 and B7
Not applicable
No substitution needed
A8 to A7, B8 to B7, Set C7 = 0
A9 to A7, B9 to B7, Set C7 = 0
A10 to A7, B10 to B7, Set C7 = 0
A11 to A7, Set B7 = 0, C7 = 0

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English