M133C Electric Power/Energy Calibrator
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Operation manual
There are different ways how to control the energy dose counting.
Packet
(Time counting)
The simplest (but less accurate) way is to count the time.
Counter / Timer
(Pulse counting)
The other way is to count pulses from energy meter. This method is called „rolling start“ method.
Meter must be connected to input IN1 or IN2. Press the ON key on the calibrator. The calibrator
starts to count energy after counting “Warm-up” pulses from the meter (rolling start). Counting is
finished after the set number of “Test” pulses is reached. The calibrator disconnects the output
terminals and shows energy delivered between set number of “Test” pulses. Calibrator also
displays deviation of the meter in % (meter constant must be defined).
In Counter mode is measuring interval defined by number of pulses. In Timer mode is measuring
interval defined by time.
Free run
(Frequency measuring)
Calibrator measures frequency of pulses from measured meter. Meter must be connected to input
IN1, IN2 or Meter. Deviation between meter and calibrator is continuously calculated and
displayed (meter constant must be defined). Calibrator displays deviation between measured and
internal "reference frequency" in %.
Use “Control” softkey to open the energy counting method selection menu. Select the required
method using cursor buttons or the rotary knob. Confirm the selection by pressing the rotary knob
or the “Select” softkey.
Power factor polarity (Lead/Lag softkey)
In case that phase shift between voltage and current is expressed as power factor you can change
its polarity using „Lead/Lag“ softkey. The Lead polarity presents capacity load (current before
voltage). The Lag polarity presents inductance load (voltage before current).
Power units (Units softkey)
The calibrator can display AC power (energy) in one of three ways:
apparent power in VA (VAs)
active power in W (Ws)
reactive power in Var (VArs)
Use “Units” softkey to open the units selection menu. Select the required expression using cursor
buttons or the rotary knob. Confirm the selection by pressing the rotary knob or the “Select”
softkey. The value of displayed power is recalculated together with new units selection. DC power
(energy) can be expressed only in W (Ws).
The calibrator can display the phase relation of output voltage and current as power factor (–1 to
+1) or as phase shift in degrees (0 to 359.99 °). Main menu is used to change the method of
displaying the phase relation.
