Campbell CR23X, Operator'S Manual

Page: 179 / 374

SECTION 10. PROCESSING INSTRUCTIONS
10-15
Tau = measured pressure (microsecond),
U(t) = measured temperature (microsecond).
Values for the calibration coefficients (U
0
, Y
1
,
Y
2
, Y
3
, C
1
, C
2
, C
3
, D
1
, D
2
, T
1
, T
2
, T
3
, T
4
, T
5
)
are provided by Paroscientific.
Instruction 64 has two parameters as shown
below.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 4 Start Loc: U(t), Tau,
U0..T5
02: 4 Destination Loc:
Temp(
o
C), Pressure(psi),
Signature
PARAMETER 1 - U(t), Tau, and 14 coefficients
provided by Paroscientific must reside in
contiguous input locations starting at the
location entered in Parameter 1.
PARAMETER 2 - The results of Instruction 64:
temperature in
°
C, pressure in psi, and the
signature of the 14 coefficients are stored in 3
contiguous input locations starting at the
location entered in Parameter 2.
Only the first 5 digits of each 7 digit coefficient are
entered in the datalogger. The maximum error
that occurs due to using five digit coefficients is
0.001 psi throughout a 15 psi range at any
temperature between -30
°
and +60
°
C. The
maximum error in temperature calculations is
0.2
°
C over the same temperature range.
Coefficients are entered using CR23X Instruction 30
(Z=F) or Instruction 65 (Bulk Load). A calibration
sheet from Paroscientific lists the 14 coefficients.
Coefficients are entered in the same order as they
appear on the calibration sheet. Coefficient U
0
is
entered first and T
5
last. Y
3
/1000 and D
1
*1000 are
entered for the Y3 and D1 coefficients, respectively.
The example below shows the correct format for
entering the coefficients.
Example: The 14 coefficients shown below are for
Paroscientific "T" Series transducer Serial Number
30135. Your coefficients will be different.
Coeff. Value Entry
U
0
5.860253 5.8603
Y
1
-3970.348 -3970.3
Y
2
-7114.265 -7114.3
* Y
3
102779.1 102.78
C
1
70.29398 70.294
C
2
6.610141 6.6101
C
3
-119.2867 -119.29
* D
1
0.0308837 30.884
D
2
0.0 0.0
T
1
26.33703 26.337
T
2
0.8516985 0.85170
T
3
21.80118 21.801
T
4
0.0 0.0
T
5
0.0 0.0
* Y
3
and D
1
coefficients are entered as Y
3
/1000
and D
1
*1000.
The large number of coefficients which must be
entered into the program often leads to entry
error. As a check on coefficient entry, the third
value output by Instruction 64 is the signature of
the coefficients. The signature is a calculated
number unique to the value and order of the 14
coefficients. For future comparisons, note this
signature after entering the coefficients
correctly. Signatures will be identical if and only
if exactly the same coefficients are entered.
Input locations read: 16
Input locations altered: 3
*** 65 BULK LOAD ***
FUNCTION
Instruction 65 inputs given values in up to eight
Input Storage locations.
The Bulk Load instruction has 9 parameters.
The first eight are the values to be entered in
input storage locations. The ninth is the input
location for the first data value; subsequent data
values are placed in sequential input locations.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: FP Param. to be entered
02: FP "
03: FP "
04: FP "
05: FP "
06: FP "
07: FP "
08: FP "
09: 4 Starting input location
Input locations altered: 8