Measurement-computing LogBook Series Manual do Utilizador descarregar pdf (Página 66)

pg. 12, DBK Basics 967794 Daq Systems

Power Supply DBKs

Power supply type DBKs are typically used in laboratory, automotive, and field applications. Input power

can come from any +10 to +20 VDC source, or from an AC source by using an appropriately rated AC-to-

DC adapter. The DBK30A rechargeable power supply can power DBK modules where AC mains are not

available (the DBK30A outputs 28 V for powering transducers). For a large number of DBK cards, the

DBK32A or DBK33 can be installed into an expansion slot. The DBK33 is used when +5 V is required in

addition to ±15 VDC. The DBK34 provides a steady 12 or 24 VDC while working with vehicle electrical

systems that may be turned on or off during testing.

Power Supply

Product Name/Description Power

DBK30A Rechargeable Battery/Excitation Module +12-14, 24-28 VDC (3.4 A-hr @ 14 VDC)

DBK32A Auxiliary Power Supply Card ±15 V @ 500 mA

DBK33 Triple-Output Power Supply Card ±15 V @ 250 mA; +5 V @ 1 A

DBK34 Vehicle UPS Module 12/24 VDC (5 A-hr @12 VDC)

DBK34A UPS Battery Module 12/24 VDC (5 A-hr @12 VDC)

Tips on Setting up a Data Acquisition System

A successful installation involves setting up equipment and setting software parameters. In addition to this

manual, you may need to consult your Daq device or LogBook user’s manual.

DBKs should be configured before connections are made and power is applied. This sequence can prevent

equipment damage and will help ensure proper operation on startup. Many DBKs have on-board jumpers

and/or DIP switches that are used for setting channels and other variables. You will need to refer to the

individual DBK document modules to ensure that the DBKs are properly configured for you application.

Prior to designing or setting up a custom data acquisition system, you should review the following tips.

After reviewing the material you can write out the steps to setup a system that will best meet your specific

application needs.

1. The end use of the acquisition data should be used to determine how you set up and program your

acquisition system. Prior to creating the system you should understand its layout and know how you are

going to assign the channels. If you can answer the following questions you are off to a good start. If

not, you need to find the answers.

• What engineering units, ranges, sampling rates, etc. are best for your data?

• Will the data be charted graphically, statistically processed, or exported to other programs?

• How will the data be used?

• How will the data be saved?

• What are the system power requirements? Using several DBKs or transducers that require

excitation current may require an extra power supply, e.g., a DBK32A.

2. Assign channel numbers.

3. Plan the location of transducers, cable runs, DBKs, the acquisition device [LogBook or Daq device],

and the computer. Label your transducers, cables, and connectors to prevent later confusion.

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Measurement-computing LogBook Series Manual do Utilizador Página 66