Measurement Computing LogBook Series - Manual (Page 68)

pg. 14, DBK Basics 967794 Daq Systems
Power Supplies and Power Connectors
Power supplies convert the raw power they receive into a lower DC voltage and/or current for use by
devices with various power demands. Many of the power supplies that are used to power data acquisition
equipment are of the switching-mode type. These devices provide a regulated output whether the power
supply’s input is, for example, 60 Hz, 120 VAC as in the United States or, 50 Hz, 220 VAC as found in
European countries. Small power supplies, that do not switch, consist of simple transformer/rectifiers and
filtered capacitors; and operate over a smaller voltage range.
Some manufacturers improve the power output of their units over time, without changing the model
number. For example, one very popular power supply was previously rated at 15 VDC @ 2.7 amps, yet
more recent versions of the same model number are rated 15 VDC @ 3.3 amps. Read the manufacturer’s
information pertaining to your power supplies so you don’t accidentally overload the supply.
DBKs – The following table indicates the type of power supply that is typically used with certain DBKs.
These DBKs can be powered from a
Switching-Mode Type Power Supply
The switching-mode power supply typically
receives power from a 100 to 240 VAC source at 50
Hz to
60 Hz and converts it to the 15 VDC required by the
DBK.
These DBKs can be powered from a
Transformer/Rectifier Type, Unregulated Power Supply
The DBKs in this column use up to15 VDC @
900 mA. This transformer/rectifier type power
supply receives power from a 110 to 125 VAC
source, at 60 Hz, and converts it to the 15 VDC
required.
DBK Description DBK Description
DBK32A Auxiliary Power Supply Card DBK23 Optically Isolated Digital-Input Module
DBK33 Triple-Output Power Supply Card DBK24 Optically Isolated Digital-Output Module
DBK42 5B Isolated Signal Conditioning Module DBK43A Strain Gage Measurement Module
DBK70 Vehicle Network Interface DBK50 Isolated High-Voltage Input Module
DBK51 Isolated Low-Voltage Input Module
The DIN5 is the system’s basic power connector (see the following figure). The CA-115 is a 6-in. cable
with a plug (male) DIN5 connector on both ends. The CA-115 is used to connect DBK32As [or DBK33s]
in parallel when they are to be powered by the same power supply.
Power Output Connector
Male connector located on the
power supply cable and on both
ends of the CA-115 cable.
Power Input Connector
Female connector located on
the device being powered
(DaqBook, DBK32A, DBK33).
(see Notes 1 and 2)
DIN5 Power Connectors
DIN5 Power Out
On a DBK34 and DBK34A
Note 1: DIN5 connectors for LogBook, DBK34, and DBK34A have threaded retaining rings.
Note 2: In regard to the above pinout for the DBK34 and DBK34A Power Out DIN5 connector, the 28 V
pin is only active when the device is in the 28 VDC mode; however, the 14 V pin is active
regardless of the mode selected.