Section 8. Operation
specification of terminals configured for exctitation in Specifications (p. 91) to
understand their limitations. Specifications are applicable only for loads not
exceeding ±25 mA.
CRBasic instructions that control voltage excitation include the following:
• BrFull()
• BrFull6W()
• BrHalf()
• BrHalf3W()
• BrHalf4W()
• ExciteV()
Note Square-wave ac excitation for use with polarizing bridge sensors is
configured with the RevEx parameter of the bridge instructions.
8.2.2 Continuous-Regulated (5V Terminal)
The 5V terminal is regulated and remains near 5 Vdc (±4%) so long as the CR800
supply voltage remains above 9.6 Vdc. It is intended for power sensors or devices
requiring a 5 Vdc power supply. It is not intended as an excitation source for
bridge measurements. However, measurement of the 5V terminal output, by
means of jumpering to an analog input on the same CR800), will facilitate an
accurate bridge measurement if 5V must be used.
Note Table Current Source and Sink Limits
(p. 389) has more information
on excitation load capacity.
8.2.3 Continuous-Unregulated Voltage (12V Terminal)
Use 12V terminals to continuously power devices that require 12 Vdc. Voltage
on the 12V terminals will change with CR800 supply voltage.
Caution Voltage levels at the 12V and switched SW12 terminals, and pin
8 on the CS I/O port, are tied closely to the voltage levels of the main
power supply. For example, if the power received at the POWER IN 12V
and G terminals is 16 Vdc, the 12V and SW12 terminals, and pin 8 on
the CS I/O port, will supply 16 Vdc to a connected peripheral. If the
connected peripheral or sensor is not designed for that voltage level, it
may be damaged.
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