Power requirements

Protection: Power inputs are protected against surge, over-voltage, over-current, and reverse power. IEC 61000-4 Class 4 level.

Power In Terminal :

  • Voltage Input: 10 to 18 VDC
  • Input Current Limit at 12 VDC:
    • 4.35 A at -40 °C
    • 3 A at 20 °C
    • 1.56 A at 85 °C
  • 30 VDC sustained voltage limit without damage. Transient voltage suppressor (TVS) diodes at the POWER IN terminal clamps transients to 36 to 40 V. Input voltages greater than 18 V and less than 32 V are tolerated; however, the 12 V output SW12-1 and SW12-2 are disabled and will not function until the input voltage falls below 16 V. Sustained input voltages in excess of 32 V can damage the TVS diodes. If the voltage on the POWER IN terminals exceeds 19 V, power is shut off to certain parts of the data logger to prevent damaging connected sensors or peripherals.

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 CS I/O port and the 5V, 12V, and SW12 terminals will not be operational. When powered by USB (no other power supplies connected) Status table field Battery = 0.

Internal Lithium Battery: AA, 2.4 Ah, 3.6 VDC (Tadiran TL 5903/S) for battery-backed SRAM and clock. 3-year life with no external power source. See also Internal battery.

Average Current Drain:

Assumes 12 VDC on POWER IN terminals.

  • Idle: <1 mA
  • Active 1 Hz Scan: 1 mA
  • Active 20 Hz Scan: 55 mA
  • Serial (RS-232/RS-485): Active + 25 mA
  • Ethernet Power Requirements:
    • Ethernet 1 Minute: Active + 1 mA
    • Ethernet Idle: Active + 4 mA
    • Ethernet Link: Active + 47 mA

Vehicle Power Connection: When primary power is pulled from the vehicle power system, a second power supply OR charge regulator may be required to overcome the voltage drop at vehicle start-up.