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We have been asked whether we feel do-it-yourself (aka “In-House”) Signal Conditioning is a better option than buying signal-conditioning solutions from a vendor. The table below summarizes our opinion – in summary ... you or your organization are almost always better off buying a canned solution. Fewer headaches!
Canned (pre-built) Solutions |
In-house design |
1. Scalable – One can simply add or remove channels & cost on a per channel basis 2. Flexible – One can change functions on a per channel basis; that is: add thermocouples or RTDs to a voltage-input system 3. Serviceable – One gets the shortest MTTR (mean-time-to-repair) since I/O is replaceable on a per channel basis 4. Easy to apply – Instrument such as I/O impedances interface to broadest types of electronic components and systems 5. Vendor Item – Complete subassembly that's designed from input to output for the following:
6. Agency Certifications – CSA, FM, CE and other certifications are part of each sub-assembly (part number) 7. Test Reports – Vendor ships test reports (serialized) with each signal conditioner
8. Lowest Lifetime Costs, Controllable – Vendor purchases for high-volume production. Also, as with any vendor item, you have simple part numbers, quantities, and costs to negotiate on fixed period of time contract 9. DAQ vendor always has parts Inventory – Vendor keeps thousands of parts/modules on the shelf to support your emergency needs 10. Simple Upgrade Path – Quick and easy drop-in design improvements; e.g. a dash 1 or dash B part number.
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1. Fixed (not scalable) – No. of channels are created at design time and that number can’t be changed 2. Fixed – Functions are designed in as a step in the design process and not changeable. 3. Difficult-to-repair – Troubleshooting can be very difficult! To trace and repair problems can take a lot of time and consume your resources + $. 4. System Interaction is where many analog circuits fail due to mismatched impedances, bandwidths and grounds. 5. Analog Design Expertise is Rare Today: It’s very hard to find a knowledgeable analog engineer and just as difficult to pass expertise on from engineer to engineer. Signal conditioners require multi-faceted analog design capabilities – one must consider all facets to create a solid design. 6. Agencies will need to be revisited for (re-)certification on any product upgrades and submitted for all new OEM products 7. Testing Expense – One will need to add the cost of test equipment and technician time to your own product cost 8. Engineering Change Orders – These are the hidden costs associated with each circuit board revision, documentation controls, raw material costs and other MRP overhead costs. 9. Customer Support + Field Service need investment in renewal parts inventory –- increases costs in raw materials and work-in-process as well. 10. Complex Up-Grade Path – One must re-address issues 4, 5, 6, 7, and 8 above |