IEEE-488 Reference
3-111
These commands program the various parameters for SPRTD (Standard Platinum Resistance
Thermometers). A single SPRTD, however, usually cannot be used to cover the entire range, so
the temperature range is broken up into several subranges. An SPRTD is supplied with a certif-
icate of calibration that lists the calibration constants and the temperature range supported. In
most cases, the supplied coefficients must be translated into Model 2002 values as summarized
in the table below. See paragraph 2.4.5 in Section 2 for more information.
Suppose you are using an SPRTD that has been calibrated for subrange #2 above that is cali-
brated for measurements between 24.5561 and 273.16K. The Model 2002, however, supports
only SPRTD temperatures down to 83.805K, so temperatures below 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 coefficients. You can set up the Model 2002 for
this measurement as follows:
1. Set the temperature sensor type to FRTD (4-wire measurement) by sending:
:SENS1:TEMP:TRAN FRTD
2. Choose the RTD type as SPRTD:
:SENS1:TEMP:RTD:TYPE SPRTD
3. Set the RTD sensor 0˚C resistance value:
:SENS1:TEMP:RTD:SPRTD:RZER <R_zero>
4. Set the A4 coefficient to the RTD certificate value for A2:
:SENS1:TEMP:SPRTD:A4 < certificate_A2_value >
5. Set the B4 coefficient to the RTD certificate value for B2:
:SENS1:TEMP:SPRTD:B4 < certificate_B2_value >
Note that the A7, B7, and C7 values will not be used for this sensor.
6. Change to the temperature function, and begin taking readings.
:TCouple:TYPE <name>
[:SENSe[1]]:TEMPerature:TCouple:TYPE <name> Specify TC type
<name> = J Set operation for Type J thermocouples
T Set operation for Type T thermocouples
K Set operation for Type K thermocouples
E Set operation for Type E thermocouples
R Set operation for Type R thermocouples
Coefficients RTD coefficients to Model 2002 coefficients
Subrange #1: 13.8033K - 273.16K Not applicable
Subrange #2: 24.5561K - 273.16K A2 to A4, B2 to B4
Subrange #3: 54.3584K - 273.16K A3 to A4, B3 to B4
Subrange #4: 83.8058K - 273.16K No substitution needed
Subrange #5: 234.3156K - 302.9146K 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
Subrange #6: 273.15K - 1234.93K Not applicable
Subrange #7: 273.15K - 933.473K No substitution needed
Subrange #8: 273.15K - 692.677K A8 to A7, B8 to B7, Set C7 = 0
Subrange #9: 273.15K - 505.078K A9 to A7, B9 to B7, Set C7 = 0
Subrange #10: 273.15K - 429.7485K A10 to A7, B10 to B7, Set C7 = 0
Subrange #11: 273.15K - 302.9146K A11 to A7, Set B7 = 0, C7 = 0
Description
Example
3.18.19
Parameters
To Next Page
Loading...
Need help?
General
