Cobra4 Sensor-Unit Energy: Current, voltage, work, power

Function and Applications

The Cobra4 Sensor-Unit Energy is used for the measurement and direct indication of measurement variables of the electrical power and energy in direct current and alternating current circuits (current, voltage, effective and apparent power, angular phase shift, frequency, electric work).

Benefits

This sensor measures directly the values for alternating current and direct current. This allows numerous basic as well as application-oriented experiments, e.g. the determination of the charactersitics of alternating current resistances or the investigation of the energy demand of consumers.

Equipment and technical data

• Operating modes:
• • "u(t), i(t)": instantaneous values, max. sample rate 2000 Hz
  • "Energy DC": direct current circuit, max. measuring rate 4 Hz
  • "Energy AC": alternating current circuit, max. measuring rate 4 Hz, up to 6000 Hz signal frequency, trueRMS
• Voltage:
• • Range 30 V: -30…30 V, resolution: 0.01 V, internal resistance: > 5 MOhm
  • Range 1000 mV: -1000…1000 mV, resolution: 0.1 mV, internal resistance: > 200 kOhm
  • Accuracy: 1.5 % of upper range value
  • Damping: ±2 dB (at 6000 Hz)
  • Overvoltage protection: up to 50 V
• Current:
• • Range 6 A: -6…6 A (6 A for 3 min until overcurrent protection is active), resolution: 0.001 A, internal resistance: 33 mOhm, overcurrent protection: max. 10 A self reset after approx. 5 min
  • Range 600 mA: -600…600 mA, resolution: 0.1 mA, internal resistance: 2 Ohm, overcurrent protection: max. 2 A self reset after approx. 5 min
  • Accuracy: 1.5 % of upper range value
  • Damping: ±2 dB (at 6000 Hz)
• Active power: 0... max. 180 W, max. resolution 0.01 mW
• Apparent power: 0... max. 180 VA, max. resolution 0.01 mVA
• Reactive power: 0... max. 180 var, max. resolution 0.01 mvar
• Electrical work: 0... max. 100000 Wh, max. resolution 0.1 Ws
• Phase shift: -90…90°, resolution: 0.1°
• Frequency: 10…6000 Hz, resolution: 0.1 Hz (< 1000 Hz), 1 Hz (> 1000 Hz)
• Operating temperature range: 5…40° C
• Relative humidity: < 80%
• Current consumption: 100 mA
• Dimensions L x W x H (mm): 110 x 70 x 30
• Weight: 110 g

Necessary Accessories

• Basic device:
  Cobra4 Wireless-Link 12601-00, and Wireless Manager 12600-00 and Software measure Cobra4 14550-61
  or Cobra4 USB-Link 12610-00 and Software measure Cobra4 14550-61
  or Cobra4 Mobile-Link 12620-10

Additional Accesories

• Large scale display 07157-93 and Display-Connect Set 12623-88, for use with the Mobile-Link for demonstration experiments