INMEL 8033/8031
The calibrator INMEL 8033 is the power and energy calibrator in the threephase system producing on six outputs three voltage courses and three current courses. These courses are shifted in relation to themselves for given phase angle.
A discriminant this calibrator is the digital method of the generation, the measurement and the stabilization of parameters of output signals. The generation of signals in voltage and current tracks one realized based on integrated circuit of the direct digital synthesis of the frequency (DDS). To the realization of the feedback loop one applied the precise digital multitransducer realized on the basis of the high grade of transducers A/C and the processor of DSP signal. Accepted solution makes possible generating of courses deformed to 25this of harmonic and assure the large stability of amplitudes, frequencies and phases of generated signals.
Calibrator versions
Calibrator's performance is highly enhanced by a set of additional functions, which simplify the measurements.
Increase or decrease value of output quantity with value by hand wheel – for quantity: U, I,*, f, cos*, P, Q.
Error calculation of checked watthour meter after setting the number of disc revolutions (impulse).
Generate energy portions set.
Disconnection and connection auto range change for voltage and currents outputs with transitions:
140 140.001V,
280 280.001V,
0.5 0.500001A,
2.5 2.50001A,
10 10.00001 A.
Independent switch on and switch off tracks CH(U), CH(V), CH(W) voltage and
current, only voltage, only current
Choose local/remote control by interface RS 232, IEEE 488.
Simultaneous switch on/switch off all outputs by OPERATE, STANDBY keys.
Choose three phase, two phase single phase set.
Setup parameters of harmonic courses put on course voltage and current.
Work in threephase asymmetric set.
Possibility to synchronize the output course of calibrator with supply frequency
Possibility current generation up to 300A with parallel conection the current blocks.
A discriminant this calibrator is the digital method of the generation, the measurement and the stabilization of parameters of output signals. The generation of signals in voltage and current tracks one realized based on integrated circuit of the direct digital synthesis of the frequency (DDS). To the realization of the feedback loop one applied the precise digital multitransducer realized on the basis of the high grade of transducers A/C and the processor of DSP signal. Accepted solution makes possible generating of courses deformed to 25this of harmonic and assure the large stability of amplitudes, frequencies and phases of generated signals.
Calibrator versions
 The INMEL 8033 calibrator is produced in two versions:
 INMEL 8033  basic version – threephase – current range 0.005…50A
 Option: current range 0.005…100A
 INMEL 8031  singlephase version
 Power supply option: 115 V AC.
 AC voltage source
 AC current source
 frequency voltage
 power source
 harmonics source
 the measure voltage and current DC from 10V to 20 mA
Calibrator's performance is highly enhanced by a set of additional functions, which simplify the measurements.
Increase or decrease value of output quantity with value by hand wheel – for quantity: U, I,*, f, cos*, P, Q.
Error calculation of checked watthour meter after setting the number of disc revolutions (impulse).
Generate energy portions set.
Disconnection and connection auto range change for voltage and currents outputs with transitions:
140 140.001V,
280 280.001V,
0.5 0.500001A,
2.5 2.50001A,
10 10.00001 A.
Independent switch on and switch off tracks CH(U), CH(V), CH(W) voltage and
current, only voltage, only current
Choose local/remote control by interface RS 232, IEEE 488.
Simultaneous switch on/switch off all outputs by OPERATE, STANDBY keys.
Choose three phase, two phase single phase set.
Setup parameters of harmonic courses put on course voltage and current.
Work in threephase asymmetric set.
Possibility to synchronize the output course of calibrator with supply frequency
Possibility current generation up to 300A with parallel conection the current blocks.
Checking ang calibration:
The metrological parameters of the instrument are adapted first of all to applied measures in the energetics.
 wattmeters, varmeters,
 phase meters,
 frequency meters,
 AC of voltmeters and ammeters,
 power factor and phase angle meters,
 measuring transducers,
 watthour meters in single and threephase system,
 power engineering protections.
The metrological parameters of the instrument are adapted first of all to applied measures in the energetics.
Basic parameters
Quantity  Range  Setting range  Resolution  Load  Acuuracy^{1), 2)}  
U  140 V  1.400...140.00 V  10 mV  0...360 mA 
ΔU= +/[0.04%US+0.01%UR]


280 V  2.80...280.00 V  0…180 mA  P = 50VA  
750 V  7.50...750.00 V  0…67 mA 
1) accuracy in reference conditions during one year following the calibration day 2) US– set value, UR – range rated value
Quantity  Range  Setting range  Resolution  Load  Acuuracy^{1), 2)}  
I  0.5 A  0.00500...0.50000 A  0.01 mA  0...20 V  P = 10 VA  ΔU= +/ [0.04%IS +0.01%IR] 
2.5 A  0.0250...2.5000 A  0.1 mA  0...10 V  P = 25 VA  
10 A  0.100...10.000 A  1 mA  0...5 V  P = 50 VA  
50 A  0.500...50.000 A  1 mA  0...1 V  P = 50 VA  ΔU= +/ [0.05%IS +0.02%IR]  
100A*  0.500...100.000 A  1 mA  0...5 V  P = 50 VA  ΔU= +/ [0.05%IS +0.02%IR] 
1) accuracy in reference conditions during one year following the calibration day 2) IS  set value, I R  range rated value *  optional ( instead of 50A range)
Quantity  Setting range  Resolution  Acuuracy^{1), 2)} 
f 
40.00...99.99 Hz
100.0...1250 Hz

0.01 Hz
0.1 Hz

Δf=+/0.01
Δf=+/0.1

φ  +/180°  0.01° 
0.1° (48..62)Hz
0.3° (40..1250)Hz

cos φ  0...1  results from resolution φ  Δcosφ=[cosφcos(φΔφ)] 
P  0.007...3 x 37 500W  results from resolution U, I i cos φ 
for cosφ=1
+/0.06%S+0.02%R
for cosφ0.5
+/0.08%S+0.02%R

Q  0.007...112.5 var  results from resolution U, I i sin φ 
for cosφ=1
+/0.06%S+0.02%R
for cosφ=0.5
+/0.08%S+0.02%R

E  max.590 kWh  0.001 kWh  δE= [δt_{E}+ EX] 
Measurement of DC voltage 
0...10.0 V  0.001 V  +/[0.04%U_{S}+0.01%U_{R}] 
Measurement of DC current 
0...20.0 mA  0.001 mA  +/[0.04%I_{S}+0.01%I_{Z}] 
1) accuracy in reference conditions during one year following the calibration day 2) S, US, IS  set value, R, UR, IR  range rated value
Reference conditions and operating conditions.
Influential Factor  Reference Range  Operating Range 
Ambient temperature  +23 °C +/ 2 °C  +5...+40 °C 
Atmosphere pressure  70...106 kPa  
Relative humidity  20...80 %  
Supply voltage  230 V +/10% / 115V+/10%  
Supply voltage frequency  50 Hz +/5% / 60 Hz +/5%  
Supply voltage shape and distortion factor  sinusoidal; distortion factor β<0.5  
Warm up  not less than 60 min. to full accuracy  
Load reactance  0...10 nF lub 0...10 mH  
Output voltage and current frequency  40.00...1250 Hz  
Operation position  pozioma +/30°  
Air movement velocity  0...0.5 m/s  
Ventilation  forced  
Radio frequency interference  none (negligible)  
Magnetic and electric field  none (negligible)  
Magnetic and electric field  none (Earth field)  
Insulation  brak  
Dust, powder, salt, water and aggressive gas contents in the air  none (negligible) 
General parameters:
Power consumption  300 V 
Dimensions  width 449 mm, height 286 mm, depth 506 mm 
Mass  48 kg 
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