INMEL 33/33A/31
INMEL 33 Calibrator is a three phase electric power and energy calibrator. On its three voltage outputs it generates voltages of equal rms value and on its three current outputs it generates currents of equal rms value. The phase angle between voltage and current of a phase is set by the user and is the same for any of the three phases.
Calibrator's performance is highly enhanced by a set of internal programs that ease measurements.
Setting and recalling programs is made with the keys on the control board.
Output terminals and overload indicators are mounted on the front panel.
Version of calibrator
The calibrator INMEL 33 is produce in three versions:
INMEL 33 Calibrator provides the following measurement functions.
Automatic range selection with the following transfer values:
130 130.001V,
250 250.001V,
0.50.500001A,
2.5 2.50001A,
10 10.00001 A.
Multiple increasing or decreasing output quantity value by a preset value without pressing enter key  valid for U, I, , f, , , P, Q, S acc. to Table 1.4.1, with possibility of immediate return to initial value.
Multiple increasing or decreasing output quantity value by a preset value (M) without pressing enter key  valid for U , I , , f , , , P , Q , S acc. to Table 1.4.1.
Immediate generation of the minimal and maximum value of the range.
Fast or slow semi  continuous increasing or decreasing output value with a constant speed  valid for U , I , , f , i with possibility of immediate return to initial value. The process stops when the key is released or the output value reaches the end of range limit.
Independent switching on and off any phase output.
Simultaneous switching on and off all the outputs.
3 phase or single phase power/energy calculation selection.
Selection of 4wire or 3wire network for power/energy calculations and voltage settings.
Presetting two output values and their fast generation (MIN and MAX keys).
Setting limiting values for settings.
Automatic cyclic decreasing and increasing output value by preset value around n different output values (n = 1...9) such that
OVi+1 = OVi + M
where
OVi  output value; i = 1,2,...,n
M  preset value in M memory cell
The function is available for U , I , , , or f acc. to Table 1.4.1.
This function may be used to check analog meter in described scale points;
if so, then:  maximum allowable meter error, M  increment between desribed scale points.
Automatic cyclic increasing and decreasing output value between two preset values  valid for U , I , , , or f acc. to Table 1.4.1.
Setting the speed for fast and slow semi  continuous increasing and decreasing functions.
Generating preset portion of energy for energy meters calibration ( one of possible algorithms of calibration  see function P).
Measurement of energy counter error by measuring time of disk rotation.
Local or remote control selection (for version with interfaces only).
Setting various phase angles among voltages or currents
Calibrator's performance is highly enhanced by a set of internal programs that ease measurements.
Setting and recalling programs is made with the keys on the control board.
Output terminals and overload indicators are mounted on the front panel.
Version of calibrator
The calibrator INMEL 33 is produce in three versions:
 INMEL 31 in single phase system,
 INMEL 33 (basic version) in threephase system
 INMEL 33 A in threephase system at asymmetric load.
INMEL 33 Calibrator provides the following measurement functions.
Automatic range selection with the following transfer values:
130 130.001V,
250 250.001V,
0.50.500001A,
2.5 2.50001A,
10 10.00001 A.
Multiple increasing or decreasing output quantity value by a preset value without pressing enter key  valid for U, I, , f, , , P, Q, S acc. to Table 1.4.1, with possibility of immediate return to initial value.
Multiple increasing or decreasing output quantity value by a preset value (M) without pressing enter key  valid for U , I , , f , , , P , Q , S acc. to Table 1.4.1.
Immediate generation of the minimal and maximum value of the range.
Fast or slow semi  continuous increasing or decreasing output value with a constant speed  valid for U , I , , f , i with possibility of immediate return to initial value. The process stops when the key is released or the output value reaches the end of range limit.
Independent switching on and off any phase output.
Simultaneous switching on and off all the outputs.
3 phase or single phase power/energy calculation selection.
Selection of 4wire or 3wire network for power/energy calculations and voltage settings.
Presetting two output values and their fast generation (MIN and MAX keys).
Setting limiting values for settings.
Automatic cyclic decreasing and increasing output value by preset value around n different output values (n = 1...9) such that
OVi+1 = OVi + M
where
OVi  output value; i = 1,2,...,n
M  preset value in M memory cell
The function is available for U , I , , , or f acc. to Table 1.4.1.
This function may be used to check analog meter in described scale points;
if so, then:  maximum allowable meter error, M  increment between desribed scale points.
Automatic cyclic increasing and decreasing output value between two preset values  valid for U , I , , , or f acc. to Table 1.4.1.
Setting the speed for fast and slow semi  continuous increasing and decreasing functions.
Generating preset portion of energy for energy meters calibration ( one of possible algorithms of calibration  see function P).
Measurement of energy counter error by measuring time of disk rotation.
Local or remote control selection (for version with interfaces only).
Setting various phase angles among voltages or currents
Checking and calibration:
 AC voltmeters and ammeters,
 power factor meters,
 phase angle meters,
 frequency meters,
 measuring transducers,
 watthour meters,
 power engineering protections.
Basic parameters:
Quantity  Range  Setting range  Resolution  Load  Acuuracy ^{1), 2)} 
U 
130 V
250 V
750 V

1.300...130.000 V 2.500...250.000 V 7.500...750.000 V 0.005000...0.500000 A 
1 mV
1 mV
1 mV

0  180 mA 0 90 mA 0 26 mA 
ΔU= +/ [0.05%U_{s} +0.01%UR]

I  0.5 A 2.5 A 10 A 50 A 
0.005000...0.500000 A 0.02500...2.50000 A 0.10000...10.00000 A 0.5000...50.0000 A 
1μ A 10 μ A 10 μ A 0.1 m A 
0  20 V 0  8 V 02 V 00.35 V 
ΔI=+/[0.05%I_{s} +0.01%I_{R}] 
F  40.00...99.99 Hz 100.0...499.9 Hz 
0.01 Hz 0.1 Hz 
+/0.01 Hz +/0.1 Hz 

φ  0... 360°  0.18°  Δφ= +/(0.32..0.5)°  
S  3x0.0065...3 x 37500 V*A  δS= +/(0.12..0.3)%  
P  0...3*375000 W  δP= +/(0.12..0.3)% dla φ 

Q  0...3*375000 var  δQ= +/(0.12..0.3)% dla φ=90° 

^{t}E  1min...540min  1min  δtE=+/[(1s/tE)8100%  
E  Results from power resolution.*1min    δE=+/[δtE+δP] 
1) accuracy in reference conditions during one year following the calibration day
2) US, Is– set value, UR,IR – range rated value
General parameters:
Maximum common mode voltage within frequency range 0...60 Hz   1500 V for HI voltage output terminals  100 V for current terminals 
Case protection  IP20 
Power consumption  300 VA 
Dimensions  width 470 mm, height 310 mm, depth 545 mm/695 mm 
Mass  37.5 kg 
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