Campbell CR10 PROM, Руководство оператора

Страница: 160 / 253

SECTION 10. PROCESSING INSTRUCTIONS
10-7
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 4 Source input location
02: 4 Dest. input location
Input locations altered: 1
*** 63 PARAMETER EXTENSION ***
Instruction 63 is used immediately following
Instructions 97 or 98 to allow the entry of a variable
number of parameters. Instruction 63 can be
entered several times in sequence if the number of
parameters requires it. There are 8 two digit
parameters. Refer to instruction being extended
(97, 98) for specifics on the use of Instruction 63.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01:-08: 2 Depends upon preceding
instruction. Following
Instruction 97 RF IDs
and Phone No. 1 digit at
a time, 32 Between RF
Ids, 72 Between RF and
DC112 Phone, and No.
13 To END. Following
Instruction 98 (255
character limit) Base 10
value of ASCII character
(Appendix E) 00 TO
END.
Input locations altered: 0
*** 64 PAROSCIENTIFIC "T" SERIES
PROCESSING ***
FUNCTION
Instruction 64 processes measurements made on
the Paroscientific "T" Series pressure transducer.
Instruction 105 is in standard PROM OS10-1.1
and OS10-2.1. The transducer outputs a
temperature frequency and a pressure frequency.
The frequencies are measured using the Period
Averaging Instruction, 27, which returns the
period of the temperature and pressure signals in
microseconds. Instruction 64 converts period to
temperature and pressure according to the
following relationships provided by Paroscientific.
Pressure (psi) =
C * (1 - T
0
2
/Tau
2
) * (1 - (D * (1 - T
0
2
/Tau
2
)))
Temperature (
°
C) =
Y
1
U + Y
2
U
2
+ Y
3
U
3
where, C = C
1
+ C
2
U + C
3
U
2
(psi),
T
0
= T
1
+ T
2
U + T
3
U
2
+ T
4
U
3
+ T
5
U
4
(microsecond),
D = D
1
+ D
2
U (microsecond),
U = U(t) - U
0
(microsecond),
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: Temp(us),
Pressure(us), U0..T5
02: 4 Start Loc: Temp(
o
C),
Pressure(psi), Signature
PARAMETER 1 - Tau, U(t) 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
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 CR10 Instruction 30
(Z=F). 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.