Irga-K calibration device

Irga-K calibration device is intended for reproduction (generation) of exact program-controlled values:

DC power
DC voltage
DC resistance
meander-type periodic signals

A calibrator modification is produced (Irga-K/2), which, along with reproducing the above parameters, can be used to measure the frequency of a periodic signal.

More description

Description

The calibrator can be used:

to set up and calibrate controllers, proofreaders, electronic corrector and other mini-computers with input signals corresponding to the parameters of the calibrator output signals, for example, the Irga-2 computer, computers manufactured by NPF Logika, ZAO NPF Teplocom, etc.
to configure and verify primary sensors: pressure, temperature, flow or any other, the output signal range of which corresponds to the signal ranges of the calibrator
to calibrate (verify) electrical signal channels in automated process control systems
as a means of automatic calibration (verification) of sensors and measuring channels in multi-parameter measuring systems
wherever high-precision, program-controlled generation of electrical signals is required

The scope of supply includes:

the Irga-K main unit
switching units (1 to 3)
power supply unit (output parameters from 6 to 18 V, 0.5 A)
PC with the necessary sets of documentation and software
set of connecting cables
jumpers
operational documentation

Note
* The BK-1, BK-2 and BK-3 switching units are used to connect various devices to the output channels of the calibrator.
The switching units are mounted in plastic cases and have a set of terminals for connection to the calibrator main unit.
The face of the BK-1 and BK-3 casing has connectors for power supply.

Technical characteristics

Current range	0.001 to 25 mA
basic absolute error of the DC reproduction:	no more than ± 1.5 mA (0.003 to 5 mA) no more than ± 7.5 mA (5.001 to 25 mA)
discreteness of reproduced currents	1 μA
Voltage range	0.5 to 4.5 V
basic absolute error of the DC voltage reproduction	no more than ± 1,4 mV
discreteness of generated voltage	1 mV
Resistance range	30 to 290 ohms
basic relative error in reproducing DC resistance	± 0,015 %
discreteness of generated resistance	0.1 ohm
Range of generated periods	0.0002 to 1,200 s
basic relative error of the period reproduction	no more than ± 0,03
discreteness of generated periods	0.5 μs
Range of measured periods	0.0002 to 10 s
limits of the relative period measurement error	no more than ± 0,03 %
Verification frequency	1 year
Calibrator average serivce life	not less than 10 years
Maximum power (without PC power) consumed by the calibrator from the mains at rated voltage	maximum 11 W
Interfaces	RS-232 (9,600 bps) USB (virtual COM port)
Overall dimensions of the calibrator case (length, width, height)	230x165x85 mm
Calibrator main unit weight	no more than 2 kg
Overall dimensions of the switching unit (length, width, height)	230x165x80 mm
Switching unit weight	no more than 1 kg

Principle of operation

Using target PC software, the operator sets the required signal values at the output of the calibrator.

After receiving the task, the calibrator sets the values of the parameters on its output connectors, which takes some time. After successful setting the parameter, the calibrator reports that it is ready to output a signal.

The channel, designed to reproduce the DC rate and voltage, operates as follows:

the specified current is generated using a reference voltage source and variable resistance and flows through a reference resistor, which measures the voltage drop
to generate a DC voltage, the channel is additionally equipped with an operational amplifier for voltage drop at the reference resistor
the slave processor recalculates the current and, if necessary, changes the value of the variable resistance

The channel designed to reproduce DC resistance operates as follows:

the range of reproducible resistance values from 30 to 290 Ohms is divided into 4 sub-ranges with separate shaping stage: 30 to 47 ohms; 47 to 82 ohms; 82 to 151 ohms; 151 to 290 ohms. When a shaping stage operates, all other stages must be disabled
the reference voltage is applied to the generated and reference resistances and the generated resistance is measured by the microprocessor through the ratio of the voltage drops at the generated and reference resistors

Channels for measuring and reproducing a period are implemented using a slave processor and a crystal oscillator. The period in such channels is generated or measured by the slave processor.

The calibrator allows simultaneous setting the parameters:

8 channels - for generating either DC power or voltage
5 channels - for generating DC resistance
6 channels - generating a meander-type periodic signal
it also measures the frequency of the periodic signal (1 channel)

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