Section 7. Installation
100
• Power Supplies — Details
(p. 98)
• Power Supplies — Products
(p. 618)
• Power Sources
(p. 99)
• Troubleshooting — Power Supplies
(p. 517)
Be aware that some Vac-to-Vdc power converters produce switching noise or ac
(p. 529)
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
noise, and so increase measurement error. Noise from grid or mains power also
may be transmitted through the transformer, or induced electro-magnetically from
nearby motors, heaters, or power lines.
High-quality power regulators typically reduce noise due to power regulation.
Using the optional 50 Hz or 60 Hz rejection arguments for CRBasic analog input
measurement instructions (see Measurements — Details
(p. 335))
often improves
rejection of noise sourced from power mains. The CRBasic standard deviation
instruction, SDEV(), can be used to evaluate measurement noise.
The main power for the CR3000 is provided by an internal- or external-power
supply.
Options for an internal supply include alkaline- and rechargeable-battery bases.
While the CR3000 has a wide operating-temperature range, battery-base ranges
are more limited. Exceeding the specified range may degrade battery capacity
and lifetime. Battery leakage caused by too-high temperatures can result in
damage to the power supply or the CR3000.
7.2.3.1 Vehicle Power Connections
If a CR3000 is powered by a motor-vehicle power supply, a second power supply
may be needed. When starting the motor of the vehicle, battery voltage often
drops below the voltage required for CR3000 operation. This may cause the
CR3000 to stop measurements until the voltage again equals or exceeds the lower
limit. A second supply can be provided to prevent measurement lapses during
vehicle starting. The figure Connecting to Vehicle Power Supply
(p. 101)
illustrates
how a second power supply is connected to the CR3000. The diode OR
connection causes the supply with the largest voltage to power the CR3000 and
prevents the second backup supply from attempting to power the vehicle.
Summary of Contents for CR3000 Micrologger
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