Joule and wattmeter

LD 531831
Joule and wattmeter
  8  Joule and wattmeter

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For measurement and display of rms voltage V and current I for any wave form, plus active power P and the integral of time of P(t) (work), V(t) (surge) and I(t) (charge). The power range extends over 12 decades (from nW to kW).
The integrated electrically isolated USB port makes it possible to display and evaluate the waveforms of V(t), I(t) and P(t) their rms values, active power, apparent power and power factor (cos phi) with the supplied Windows software. * At sinusoidal input signal
** The specified accuracy applied at the end of the measuring range for DC as well as for AC with a frequency of 50 or 60 Hz and a crest factor = maximum value : effective value ≤ 2.

Technical data

  • Voltage measurement V:
    Measuring range DC: ±5/±50/±500 mV, ±5/±50/±250 V
    Measuring range AC*: -/-/350 mV, 3.5/35/250 V
  • Resolution of display: 1/10/100 µV, 1/10/100 mV
  • Input resistance: ≥1 MΩ
  • Current measurement I:
    Measuring range DC: ±0.2/±2/±20 mA,
    ±0.2/2/10 A
    Measuring range AC*: 0.14/1.4/14 mA, 0.14/1.4/10 A
  • Resolution of display: 0.1/1/10 µA, 0.1/1/10 mA
  • Input resistance: 10 Ω/approx. 0.01 Ω (shunt)
  • Power measurement P:
    Instrument range: ±10/±100 µW, ±1/±10/±100 mW, ±1/±10/±100 W, ±1/±2.5 kW
  • Resolution of display: 1/10 nW,
    0.1/1/10 µW, 0.1/1/10 mW, 0.1/1 W
  • Integration U, I, P:
    Instrument range ∫ V(t) dt: from 0.000 mVs to ±9999 kVh
    Instrument range ∫ I(t) dt: from 0.0 µAs to ±9999 kAh
    Instrument range ∫ P(t) dt: from 0.000 µWs to ±9999 kWh
  • Measuring range selection: automatic or manual
  • AC/DC change-over: automatic or manual
  • Measuring accuracy U, I**: 1%
  • Connection of the load: optional 4 mm safety sockets or earthed socket (front panel)
  • Display: 5-digit, 7-segment display for numerical value and 7x15 matrix for unit
  • Height of digits: 25 mm
  • Scanning rate: max. 10,000 values/s (for waveforms via computer)
  • USB port: USB 1.x and 2.0 (full speed), electrically isolated
  • Supply: 230 V, 50/60 Hz
  • Dimensions: 20 cm x 21 cm x 23 cm
  • Weight: approx. 2 kg

Related Documents

PDF (Instruction Sheet) PDF (Instruction Sheet) [531 831] Joule and wattmeter
PDF (Experiment description) PDF (Experiment description) P2.3.4.2 Converting electrical energy into heat energy - Measuring with the joule and wattmeter
PDF (Experiment description) PDF (Experiment description) P2.6.3.1 Determining the efficiency of the heat pump as a function of the temperature differential
PDF (Experiment description) PDF (Experiment description) P2.6.3.3 Analyzing the cyclical process of the heat pump with the Mollier diagram
PDF (Experiment description) PDF (Experiment description) P3.6.6.3 Quantitative comparison of DC power and AC power in an incandescent lamp (de)
PDF (Experiment description) PDF (Experiment description) P3.6.6.4 Determining the crest factors of various AC signal forms (de)
PDF (Experiment description) PDF (Experiment description) P3.6.6.5 Determining the active and reactive power in AC circuits
PDF (Experiment description) PDF (Experiment description) C4.4.5.2 Determination of the Faraday constant
PDF (Experiment description) PDF (Experiment description) D2.2.1.1a Thermal energy and rises in temperature
PDF (Experiment description) PDF (Experiment description) D2.2.1.2a Thermal energy and mass
PDF (Experiment description) PDF (Experiment description) D2.2.1.3a Thermal energy and materials
PDF (Experiment description) PDF (Experiment description) D2.2.1.4a Specific heat of water (de)
PDF (Experiment description) PDF (Experiment description) D3.4.5.1b Charging and discharging a capacitor - Joulemeter and wattmeter (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.1a Electrical power for various loads (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.2b How electrical power depends on current (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.3b How electrical power depends on voltage (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.4a Electrical power and the luminance of light bulbs (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.5a How electrical work depends on time (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.7b Electrical work done by an immersion heater - Joulemeter and wattmeter (de)
PDF (Experiment description) PDF (Experiment description) D3.4.6.8a Electrical work when cooking (de)
PDF (Experiment description) PDF (Experiment description) D3.4.7.1c Efficiency of a DC motor - Measurement with joulemeter and wattmeter
PDF (Experiment description) PDF (Experiment description) D3.4.7.2b Efficiency of a tachogenerator - Measurement with joulemeter and wattmeter
PDF (Experiment description) PDF (Experiment description) D3.4.7.3b Conversion of electrical energy into thermal energy - Measurement via joulemeter and wattmeter
PDF (Experiment description) PDF (Experiment description) D3.4.7.7a Characteristic power curve for a solar cell


The universal measuring instrument to demonstrate voltage, current, power and energy. Measurements possible with and without computer.
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