Campbell CR300 Series Product Manual page 198

Charger Input (CHG+ and CHG- terminals):
16 to 32 VDC
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Current limited to 0.9 A maximum
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Power converter or solar panel input
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External Batteries (BAT+ and BAT- terminals):
10 to 18 VDC input
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12 VDC, lead-acid 7 Ah battery, typical
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Internal Lithium Battery (see
for battery-backed clock. 6-year life with no external power source.
Average Current Drain:
Assumes 12 VDC on BAT terminals — add 2 mA if using CHG terminals.
Idle: 1.5 mA
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Active 1 Hz scan w/ one analog measurement: 5 mA
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Active (Processor always on): 23 mA
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Serial (RS-232): Active + 25 mA
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Ethernet power requirements (CR310 Only):
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Ethernet idle: 32 mA
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Ethernet link: Active + 51 mA
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USB Power: Functions that will be active with USB 5 VDC include sending programs, adjusting
data logger settings, and making some measurements. If USB is the only power source, then the
VX1 and VX2 ranges are reduced to 150 to 2500 mV. The SW12V terminal will not be operational.
For the control terminals (C1, C2), voltage output is limited to 4.75 V, and current output is
limited to 8 mA.
Cellular Average Additional Current Contribution at 12 VDC:
Idle: Connected to network, no data transfer.
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-CELL200 minimum = 2 mA, average = 10 mA
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-CELL205 minimum = 2 mA, average = 14 mA
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-CELL210 minimum = 2 mA, average = 28 mA
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-CELL215 minimum = 2 mA, average = 14 mA
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-CELL220 minimum = 2 mA, average = 14 mA
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-CELL225 minimum = 2 mA, average = 14 mA
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Transfer/Receive:
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-CELL200 minimum = 20 mA, average = 105 mA
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-CELL205 minimum = 20 mA, average = 75 mA
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-CELL210 minimum = 20 mA, average = 90 mA
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Internal battery (p. 109) for more information): 3 V coin cell CR2016
19. CR300 series Specifications 185