M140 Multifunction Calibrator / Tester - meatest.cz

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M-140 Multifunction Calibrator MEATEST The energy value can be set in two ways: Direct setting of energy • Select the energy mode and then keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the time value (E = xxx.xxxx) supplemented with indication of the set mode. • The value can be set using numeric keyboard, cursor buttons or potentiometer and confirmed by pressing Ws/kWs/MWs, VAs/kVAS/MVAs or VArs/kVArs/MVArs display buttons depending on the set mode. The value can also be confirmed by pressing ENTER. • Time value is recalculated using new set energy. Setting the time • Select the energy mode and then keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the time value (t = xxx.x s). • The value can be set using numeric keyboard, cursor buttons or potentiometer and confirmed by pressing “s” display button depending on the set mode. The value can also be confirmed by pressing ENTER. • Energy value is recalculated using new set time. Grounding of the calibrator and the instrument to be calibrated in the P-E mode When calibrating the power and energy meters with separate voltage and current circuits, it is advisable to select GND U ON and GND I ON (both grounding methods on) on the M-140 calibrator. This setting will ground both the current and voltage output of the calibrator. If the instrument to be calibrated has electrically connected and not grounded current and voltage inputs, GND U ON and GND I OFF should be selected on the M-140 calibrator. If Lo and -I terminals on the calibrator are connected AND the same terminals are connected at the instrument to be calibrated, resulting voltage drop at the current cables can damage the relay which interconnects Lo and -I terminals with GND terminal in the calibrator. “Operating examples“ chapter provides more information concerning correct connection of powermeters and energy meters to the calibrator. 30 Operation manual v42
MEATEST M-140 Multifunction Calibrator Uncertainty calculation of set power Uncertainty of set power displayed on the Accuracy line of the display is calculated according to the following formula: for active power d P = √ ( dU 2 + dI 2 + dPF 2 + 0.03 2 ) [%] for reactive power d P = √ ( dU 2 + dI 2 + dPF* 2 + 0.03 2 ) [%] for apparent power d P = √ ( dU 2 + dI 2 + 0.03 2 ) [%] where dP is the uncertainty of set power [%] dU is the uncertainty of set voltage [%] dI is the uncertainty of set current [%] dPF is the uncertainty of set PF (cosϕ) [%] dPF* is the uncertainty of set sinϕ [%] Generation of frequency The multifunction calibrator can generate several different voltage shapes with exact frequency, amplitude and duty cycle. The output signal is present at BNC coaxial connector FREQ located at the front panel. The signal is not present at any other output terminal. There are two frequency generation modes. The first mode (PWM) allows the generation of squarewave output signal with calibrated amplitude, frequency and duty cycle. Frequency range is up to 10 kHz. The second mode (HF) also provides squarewave output signal with very steep rising edge, typically less than 3 ns. PWM mode Frequency range: Voltage range: Signal shapes: HF mode Frequency range: Voltage range: Signal shapes: 0.1 Hz to 100 kHz 1 mV to 10 Vpp squarewave, negative PWM NEG – symmetrical PWM SYM – positive PWM POS 0.1 Hz to 20 MHz 5 V pk-pk 0, -10, -20, -30 dB symmetrical squarewave PWM mode can be used to calibrate the input sensitivity of oscilloscopes at frequencies up to 10 kHz. HF mode can be used to calibrate the time base of oscilloscopes. To switch between the modes, keep pressing “F” direct mode button. The display includes the symbols for currently selected mode (PWM or HF). Control in the frequency mode • Press F direct mode button. The calibrator switches to PWM mode. If HF mode is desired, press F button once more. The main data on the display is the frequency. • The display shows the following data: * set frequency * relative deviation of frequency * signal amplitude (PWM mode ) or attenuation (HF mode) * duty cycle (PWM mode only) * signal shape: PWM NEG / POS / SYM (PWM mode only) Operation manual v42 31
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M140 Multifunction Calibrator / Tester - meatest.cz

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