interruptible power supply).
Contact a Campbell Scientific application engineer if assistance in selecting a
power supply is needed, particularly with applications in extreme environments.
7.4.1 CR1000 Power Requirement
The CR1000 is operable with power from 9.6 to 16 Vdc applied at the POWER
IN terminals of the green connector on the face of the wiring panel.
The CR1000 is internally protected against accidental polarity reversal on the
power inputs. A transient voltage suppressor (TVS) diode at the POWER IN 12V
terminals provides protection from intermittent high voltages by clamping these
transients to within the range of 19 to 21 V . Sustained input voltages in excess of
19 V, can damage the TVS diode.
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.
7.4.2 Calculating Power Consumption
Read More Power Supplies — Overview (p. 85).
System operating time for batteries can be determined by dividing the battery
capacity (ampere-hours) by the average system current drain (amperes). The
CR1000 typically has a quiescent current drain of 0.5 mA (with display off) 0.6
mA with a 1 Hz sample rate, and >10 mA with a 100 Hz scan rate. When the
CR1000KD Keyboard Display is active, an additional 7 mA is added to the
current drain while enabling the backlight for the display adds 100 mA.
7.4.3 Power Sources
Related Topics:
• Power Supplies — Specifications
• Power Supplies — Quickstart
(p. 44)
• Power Supplies — Overview (p. 85)
• Power Supplies — Details (p. 100)
• Power Supplies — Products (p. 657)
• Power Sources (p. 101)
• Troubleshooting — Power Supplies (p. 494)
Be aware that some Vac-to-Vdc power converters produce switching noise or ac
(p. 507)
ripple as an artifact of the ac-to-dc rectification process. Excessive
switching noise on the output side of a power supply can increase measurement
101
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