Entering Or Editing The Characteristics Of A Prt To Non-Volatile Store - Fluke 8508A User Manual

Entering or Editing the Characteristics of a PRT to Non-volatile Store

The following commands are used to construct a
parameters and coefficients.
phs
PRT_CHR
This command with its associated parameter can be used to enter characteristics of a new
PRT identity to the non-volatile store.
Identity
This is a string value and thus must be enclosed in double , limited to 17 characters.
STD_PRT
This selects the conversion algorithm to be used. The ITS90 conversion is used for a
standard PRT.
CVD_ALPHA
This selects the conversion algorithm (Callender Van Deusen) to be used and the method
for expressing the conversion coefficients (R
CVD_DIN
This selects the conversion algorithm to be used and the method for expressing the
conversion coefficients (R
CVD
This selects the conversion algorithm to be used and requires only the R
other parameters are set to a default value.
TWO_WR / THREE_WR / FOUR_WR
This specifies the type of connection and thus the measurement method.
PRT_COEF
This command with its associated parameter is used to enter the coefficients, or to edit
the existing coefficients of a PRT with a known identity. NOTE that when editing all the
parameters MUST be given in the correct order. The numbers entered are associated in
the following manner:
For CVD only one number is required for the R
For CVD_DIN the first number is the R
third the B coefficient and the fourth is the C coefficient.
For CVD_ALPHA the first number is the R
the third the β coefficient and the fourth is the δ coefficient.
For STD_PRT the first number is the resistance of the probe at the triple point of
water. The second is the a+ value (a
c+ value (c
7
,
identity
Entering or editing PRT characteristics
A B C ).
zero
phs identity
Entering or Editing PRT Coefficients
). The fifth is the a- value (a
Remote Operations Using the IEEE 488 Interface
Syntax Diagrams of Major 8508A Functions
identity and set associated
PRT
,
STD_PRT
CVD_ALPHA
CVD_DIN
CVD
).
zero
,
,
phs
value.
zero
value, the second is the A coefficient, the
zero
value, the second is the α coefficient,
zero
). The third is the b+ value (b
7
). The sixth is the b- value (b
4
TWO_WR
THREE_WR
FOUR_WR
adj357f.eps
value. The
zero
adj358f.eps
). The fourth is the
7
).
4
4
4-19