Frequency acquisition yielding inconsistent results

Hello all.
I'm using a PCI-6602's counters to measure frequency from three separate places on a bearing test rig. Two are the bearing cage, one is the shaft.
The sensors I'm using are magnetic/prox in nature and are reading two magnets on each cage at about 180hz and one screw on the shaft at about 190hz.
I'm taking the frequency and multiplying it by either 30 or 60 to attain an RPM reading.
With a handheld digital tach, we have verified that the shaft is holding steady speed within 3-4 RPM, however my RPM readings are fluctuating by what seems to be the multiplier I'm using. Almost as if the system's period of count isn't consistent and it's adding or subtracting a pulse from the frequency.
Can someone look at this simple VI and recommend what I could do to filter or 'average' the count so that it's steady rather than fluctuating so much? I've tried the 'filter' express VI to no avail, I can't get it to even start to work. Maybe a different approach in the DAQ assistant and timing?
Thanks in advance.
Message Edited by Ralph@NES on 08-21-2007 12:32 PM
Still confused after 8 years.
Attachments:
RPM.vi ‏53 KB

I modified it so that I'm taking 20 samples at 499-501msec. Dividing 60 and 30 (depending on whether it was the cage at two pulses per rev or shaft at one pulse per rev) by this number and getting what appears to be a valid RPM, although my fluctuations are the same or very similar as before. Is there some kind of filtering that I need to do? What am I missing here?
Still confused after 8 years.

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Edited by: SabrinaD on Nov 18, 2009 2:31 PM
Edited by: SabrinaD on Nov 18, 2009 2:34 PM
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3 Blue Book
1 Red Book
It seems to matter what order I specify the operands stor_id = 3, or 3 = stor_id.
In the older (+) environment, I would understand this, but here? I'm pretty sure most other databases don't care about the order.
thanks for your insight
Kevin

Don't have a 9i around right now to test ... but in 10 ...
SQL> create table titles (title_id int, title varchar(50));
Â
Table created.
Â
SQL> insert into titles values (1, 'Red Book');
Â
1 row created.
Â
SQL> insert into titles values (2, 'Yellow Book');
Â
1 row created.
Â
SQL> insert into titles values (3, 'Blue Book');
Â
1 row created.
Â
SQL> insert into titles values (4, 'Orange Book');
Â
1 row created.
Â
SQL> create table sales (stor_id int, title_id int, qty int, email varchar(60));
Â
Table created.
Â
SQL> insert into sales values (1, 1, 1, '[email protected]');
Â
1 row created.
Â
SQL> insert into sales values (1, 2, 1, '[email protected]');
Â
1 row created.
Â
SQL> insert into sales values (3, 3, 4, null);
Â
1 row created.
Â
SQL> insert into sales values (3, 4, 5, '[email protected]');
Â
1 row created.
Â
SQL> SELECT titles.title_id, title, qty
2   FROM titles LEFT OUTER JOIN sales
3   ON titles.title_id = sales.title_id
4   AND stor_id = 3
5   AND sales.email is not null
6   ;
Â
TITLE_ID TITLE                                                     QTY
         4 Orange Book                                                 5
         3 Blue Book
         1 Red Book
         2 Yellow Book
Â
SQL>
SQL> SELECT titles.title_id, title, qty
2   FROM titles LEFT OUTER JOIN sales
3   ON titles.title_id = sales.title_id
4   AND 3 = stor_id
5   AND sales.email is not null;
Â
TITLE_ID TITLE                                                     QTY
         4 Orange Book                                                 5
         3 Blue Book
         1 Red Book
         2 Yellow Book
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options

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-- SDO_RELATE on a few records which actually finds the correct relationship
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Inside
check
1
-- Reset the column to null
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231484 rows updated.
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SQL> UPDATE nad_als_fixed_stn_10G_HQ C SET C.insidecheck = '1'
2 WHERE EXISTS (SELECT 1 FROM MetroRegions A, nad_als_fixed_stn_10G_HQ B
3 WHERE SDO_RELATE(B.location83r, A.geoloc, 'mask=anyinteract') = 'TRUE'
4 AND C.lic_no = B.lic_no );
48488 rows updated.
-- This particular record which was located correctly earlier appears to be skipped
SQL> select insidecheck from nad_als_fixed_stn_10G_HQ where lic_no = 4687161;
Inside
check
SQL>
François Sigouin

Thanks but it did not solve the problem of inconsistent results. The response time for the first update is much improved though. When I added the hint on the second update (which is about 600 records), it never came back so I tested without it. Any other ideas ?
François.
TEST
SQL> update nad_als_fixed_stn_10G_HQ set insidecheck = null;
231484 rows updated.
-- First update with hint, response time is improved but same results obtained
SQL> UPDATE nad_als_fixed_stn_10G_HQ C SET C.insidecheck = '1'
2 WHERE EXISTS (SELECT /*+ ORDERED */ 1 FROM MetroRegions A, nad_als_fixed_stn_10G_HQ B
3 WHERE SDO_RELATE(B.location83r, A.geoloc, 'mask=anyinteract') = 'TRUE'
4 AND C.lic_no = B.lic_no );
48488 rows updated.
SQL> select insidecheck from nad_als_fixed_stn_10G_HQ where lic_no = 4687161;
Inside
check
SQL> update nad_als_fixed_stn_10G_HQ set insidecheck = null;
231484 rows updated.
--The second update has to be without the hint otherwise it does not come back.
SQL> UPDATE nad_als_fixed_stn_10G_HQ C SET C.insidecheck = '1'
2 WHERE EXISTS (SELECT 1 FROM MetroRegions A, nad_als_fixed_stn_10G_HQ B
3 WHERE SDO_RELATE(B.location83r, A.geoloc, 'mask=anyinteract') = 'TRUE'
4 AND C.lic_no = B.lic_no and C.lic_no between 4687157 and 4687223 )
5 ;
3 rows updated.
SQL> select insidecheck from nad_als_fixed_stn_10G_HQ where lic_no = 4687161;
Inside
check
1

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I am getting inconsistent results from using dbms_output.get_lines.
I'm using get_lines in a procedure A that executes a function B to test if the function returns 0 or > 0 to indicate validity of my data. In that function, I use dbms_output.put_lines to communicate data points that I want to use. My procedure A does a get_lines after executing function B then either logs the lines into a table or sends an email.
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It runs perfectly if I run the Oracle procedure directly from the sql command line and then call it from the java code.
However if I recompile the Oracle stored procedures and execute the Callable Statement (without first running it from sql) then I am getting incorrect results...1,2,1,1 is being returned instead of 1,2,0,3. Are these results being cached somewhere???
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<pre>
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<pre>
PROCEDURE proc1( p_parm_1 OUT NUMBER, p_parm_2 OUT NUMBER, p_parm_3
OUT NUMBER, p_parm_4 OUT NUMBER)
AS
BEGIN
-- Get Counts
SELECT COUNT(*)
INTO p_parm_1
FROM blah ......
SELECT COUNT(*)
INTO p_parm_2
FROM blah ......
SELECT COUNT(*)
INTO p_parm_3
FROM blah ......
SELECT COUNT(*)
INTO p_parm_4
FROM blah ......
EXCEPTION
blah .......
END proc1;
</pre>
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Many thanks
Fionnuala

Hi
Yes I have a debug line that prints them out in the doAutoLoadBalancing method - this is the point where I am diagnosing the problem. It only prints the correct results after I have already run the procedure from the SQL command line.
public UserNumber[] doAutoLoadBalancing () throws SQLException {
autoLBNumbersNeeded.clearParameters();
autoLBNumbersNeeded.execute();
mwFF = autoLBNumbersNeeded.getLong(1);
mwHF = autoLBNumbersNeeded.getLong(2);
wmFF = autoLBNumbersNeeded.getLong(3);
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autoLBNumbersNeeded.clearParameters();
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