Lowpass filter help for thermocouple reading
Hello
I have an old legacy E-Series AI-16SE 12bit 500KHz PCI card.
I am attempting to setup a temperature reading test program. I will have the E-Series connected to a SCB-68, which will have five T type thermocouples connected. I realize this is not the best test setup but it is an attempt at a quick setup on a bench so hopefully any noise interferance will be minimal.
I will be using LV 8.2 professional development.
I was wondering if I setup a software based lowpass filter if that would be helpful in this situation?
If so can someone show an example the has a cutoff freq for 2Hz? I am unfamilular with all the settings of the lowpass filter VI and some guidance would be much appreciated.
Thanks in advance
Tim C.
1:30 Seconds ARRRGHHH!!!! I want my popcorn NOW! Isn't there anything faster than a microwave!
Tim,
Rob's idea is probably what you should try first. It is in effect a low pass filter with about a 10 Hz corner frequency.
If you find that you have strong power line frequency interference, you may need to do more aggressive signal conditioning. Especially watch out for ground loops.
Lynn
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SELECT msi.inventory_item_id,msi.segment1,msi.rimary_uom_code , msi.primary_unit_of_measure
FROM mtl_system_items_b msi, qp_list_lines qpll,qp_pricing_attributes qppr,
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Databse version
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit
PL/SQL Release 11.1.0.7.0
explain plan
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
|
0 | SELECT STATEMENT
| |
1 | 149 | 9439
(1)|
|
1 | NESTED LOOPS | | 1 |
149 | 9439 (1)|
|*
2 | HASH JOIN OUTER | | 1 |
135 | 9437 (1)|
|*
3 | HASH JOIN | | 1 |
71 | 9432 (1)|
|
4 | NESTED LOOPS | | 2 |
76 | 53 (0)|
|*
5 | TABLE ACCESS BY INDEX
ROWID| QP_LIST_LINES | 2 |
44 | 49 (0)|
|*
6 | INDEX SKIP SCAN | QP_LIST_LINES_N2 |
702 | | 20
(0)|
|*
7 | INDEX RANGE SCAN | QP_PRICING_ATTRIBUTES_N3 | 1 |
16 | 2 (0)|
|*
8 | TABLE ACCESS BY INDEX
ROWID | MTL_SYSTEM_ITEMS_B | 46254
| 1490K|
9378 (1)|
|*
9 | INDEX RANGE SCAN | MTL_SYSTEM_ITEMS_B_N9 | 46254 | |
174 (1)|
|
10 | TABLE ACCESS FULL | XX_WEB_ITEM_IMAGE_TBL |
277 | 17728 | 5 (0)|
|* 11 | INDEX RANGE SCAN | MTL_ITEM_CATEGORIES_U1 |
1 | 14 | 2
(0)|
Predicate Information (identified
by operation id):
2 -
access("XWIIT"."IMAGE_CODE"(+)="MSI"."SEGMENT1")
3 -
access("QPPR"."PRODUCT_ATTR_VALUE"=TO_CHAR("MSI"."INVENTORY_ITEM_ID")
AND
"QPPR"."PRODUCT_UOM_CODE"="MSI"."PRIMARY_UOM_CODE")
5 - filter(NVL("QPLL"."START_DATE_ACTIVE",TRUNC(SYSDATE@!))<=TRUNC(SYSDATE@!)
AND
NVL("QPLL"."END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))
6 -
access("QPLL"."LIST_HEADER_ID"=TO_NUMBER(:P_PRICE_LIST_ID))
filter("QPLL"."LIST_HEADER_ID"=TO_NUMBER(:P_PRICE_LIST_ID))
7 -
access("QPLL"."LIST_LINE_ID"="QPPR"."LIST_LINE_ID")
filter("QPPR"."PRODUCT_UOM_CODE" IS NOT NULL)
8 - filter("MSI"."ENABLED_FLAG"='Y')
9 - access("MSI"."ORGANIZATION_ID"=TO_NUMBER(:P_ORGANIZATION_ID))
11 -
access("MCB"."ORGANIZATION_ID"=TO_NUMBER(:P_ORGANIZATION_ID)
AND
"MSI"."INVENTORY_ITEM_ID"="MCB"."INVENTORY_ITEM_ID"
AND
"MCB"."CATEGORY_ID"=TO_NUMBER(:P_CATEGORY_ID))
filter("MCB"."CATEGORY_ID"=TO_NUMBER(:P_CATEGORY_ID))
Note
- 'PLAN_TABLE' is old version
TKprof Plan
TKPROF: Release 11.1.0.7.0 - Production on Fri Nov 15 06:12:26 2013
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Trace file: LSSD_ora_19760.trc
Sort options: default
count = number of times OCI procedure was executed
cpu = cpu time in seconds executing
elapsed = elapsed time in seconds executing
disk = number of physical reads of buffers from disk
query = number of buffers gotten for consistent read
current = number of buffers gotten in current mode (usually for update)
rows = number of rows processed by the fetch or execute call
SELECT msi.inventory_item_id,
msi.segment1,
primary_uom_code,
primary_unit_of_measure,
xwiit.image_url
FROM mtl_system_items_b msi,
qp_list_lines qpll,
qp_pricing_attributes qppr,
mtl_item_categories mcb,
xx_web_item_image_tbl xwiit
WHERE msi.enabled_flag = 'Y'
AND qpll.list_line_id = qppr.list_line_id
AND qppr.product_attr_value = TO_CHAR (msi.inventory_item_id)
AND qppr.product_uom_code = msi.primary_uom_code
AND msi.inventory_item_id = mcb.inventory_item_id
AND msi.organization_id = mcb.organization_id
AND TRUNC (SYSDATE) BETWEEN NVL (qpll.start_date_active,
TRUNC (SYSDATE))
AND NVL (qpll.end_date_active,
TRUNC (SYSDATE))
AND xwiit.image_code(+) = msi.segment1
AND msi.organization_id = :p_organization_id
AND qpll.list_header_id = :p_price_list_id
AND mcb.category_id = :p_category_id
call count cpu elapsed disk query current rows
Parse 2 0.00 0.00 0 0 0 0
Execute 2 0.00 0.00 0 0 0 0
Fetch 2 3.84 3.85 0 432560 0 1002
total 6 3.84 3.85 0 432560 0 1002
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 173
Rows Row Source Operation
501 NESTED LOOPS (cr=216280 pr=0 pw=0 time=115 us cost=9439 size=149 card=1)
2616 HASH JOIN OUTER (cr=211012 pr=0 pw=0 time=39 us cost=9437 size=135 card=1)
78568 HASH JOIN (cr=210997 pr=0 pw=0 time=3786 us cost=9432 size=71 card=1)
78571 NESTED LOOPS (cr=29229 pr=0 pw=0 time=35533 us cost=53 size=76 card=2)
78571 TABLE ACCESS BY INDEX ROWID QP_LIST_LINES (cr=9943 pr=0 pw=0 time=27533 us cost=49 size=44 card=2)
226733 INDEX SKIP SCAN QP_LIST_LINES_N2 (cr=865 pr=0 pw=0 time=4122 us cost=20 size=0 card=702)(object id 99730)
78571 INDEX RANGE SCAN QP_PRICING_ATTRIBUTES_N3 (cr=19286 pr=0 pw=0 time=0 us cost=2 size=16 card=1)(object id 99733)
128857 TABLE ACCESS BY INDEX ROWID MTL_SYSTEM_ITEMS_B (cr=181768 pr=0 pw=0 time=9580 us cost=9378 size=1526382 card=46254)
128857 INDEX RANGE SCAN MTL_SYSTEM_ITEMS_B_N9 (cr=450 pr=0 pw=0 time=1657 us cost=174 size=0 card=46254)(object id 199728)
277 TABLE ACCESS FULL XX_WEB_ITEM_IMAGE_TBL (cr=15 pr=0 pw=0 time=22 us cost=5 size=17728 card=277)
501 INDEX RANGE SCAN MTL_ITEM_CATEGORIES_U1 (cr=5268 pr=0 pw=0 time=0 us cost=2 size=14 card=1)(object id 99557)
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If possible can you plz explain what we have to take care while doing performance tunning
I am a fresher so don't have that much idea.
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