Mikroampermillivoltmetr self-recording N399 (N-399, N 399, h399, h-399, h 399)
Designed to measure and record the values ​​of current and voltage in DC.
Maximum permissible error of measurement and recording of measured value ± 1,5% of full scale range.
Overall dimensions 230x180x315mm.

Mikroampermillivoltmetr self-recording N399 (the instruments) are designed to measure and record the values ​​of current and voltage in DC. Conditions of operation of the device - ambient temperature from 0 to 50 ° C, relative humidity up to 80% at 25 ° C. Mikroampermillivoltmetry N399, all in areas with tropical climates, are designed to operate at an ambient temperature of 10 to 45 ° C and relative humidity 95% at 40 ° C, and in closed rooms without sharp changes in temperature, solar radiation, rain and dust . Perhaps the action of fungi and other biological factors. In this factory product designation must be supplemented by the letters "4.2."

Technical data

Maximum permissible error of measurement and recording of measured value ± 1,5% of the final value of the measuring range - for units with a zero mark on the edge of the range and the amount of the final range value - for units with a zero mark within range.
The final values ​​of the measuring range: 1mV, 5mV, 10mV, 25mV, 50mV, 75mV, 250mV, 1V, 2.5V, 5V: 10V, 25V, 50V, 100V, 10, 50; 250mkA.
Note. By agreement with the manufacturer on request made Mikroampermillivoltmetr recording N399 / 1 with the following final values ​​ranges: 5mV, 10mV, 25mV, 50mV, 100mV, 5mkA; 10mkA; 25mkA; 50mkA; 100mkA; 10V. With external shunt that Mikroampermillivoltmetr N399 comes
on request, extended measuring ranges up to 500A. Input impedance shall be as given in Table. 1.
 

Table 1.

External resistance to the measuring range of the upper limits of 1 mV up to 250mV, which are guaranteed by the dynamic properties of the device N399 (sedation, transfer), no more than 10K Values ​​of external resistors (R BH) for measuring ranges with upper limits of 1V to 100V on the dynamic properties of the instrument no effect.
Maximum permissible error of the instrument on the record time of ± 0,5%. Limit of allowable total error of instruments on the record of the measured value is equal to ± 1,5%. The total error is expressed as the intrinsic error. Maximum permissible error N399 device to measure and record the measured value, caused by the changing position of the device from its normal position in any direction by ± 5 ° equal to the limit of permissible basic error. The limit of additional error device, due to changes in supply voltage of ± 10% of nominal value or supply frequency by ± 2% from the nominal value is equal to half the value of the maximum permissible basic error. The limit of additional error N399 devices to measure and record the measured value under the influence of an external constant homogeneous magnetic field with induction of 0.5 mT in the most unfavorable direction of the magnetic field is equal to ± 0,5%. The limit of additional error devices caused by the installation on the basis of thick ferromagnetic (2 0.5) mm, equal to half of the maximum permissible basic error.
The limit of additional error recording device Mikroampermillivoltmetr N399, due to the influence placed back to back with him of the same device to be located at a distance of not less than 1 m, is ± 0,5%.
The limit of additional error N399 devices to measure and record the measured value, due to changes in ambient temperature from normal to any temperature in the range from 0 to 50 ° C is ± 1% for every 10 ° C change.
Insulation between the housing unit and all isolated dc circuits (except the measuring circuit) under normal conditions of use stand for 1 minute. impact of testing AC 50Hz, current value is:
2kV - between the network connector and the housing;
0.5 kV - timer between terminals and case;
0.5 kV - between terminals power from a DC source and the unit. Isolation between separate electrical circuits (except the measuring circuit), isolated from each other in DC, under normal operating conditions have a test voltage:
2kV - between the network connector and terminals timer;
0.5 kV - timer between terminals and clamps power from a DC source. The insulation resistance between the case and isolated from the DC of any electrical appliance chain N399, except measuring, under normal operating conditions at least 40MOm.
Settling time of the mobile device does not exceed 2 seconds. Index value of the first flip does not exceed 7% of the width of the field recording. Warm-up time (time samoprogreva) - 15 min. Write the results produced in ink on the ribbon diagram in rectangular coordinates. Ink, contains ink tank provides a continuous record of the testimony on the chart tape for at least 30 days.
Working width of 100 mm chart tape. Length chart tape for at least 15m. Countdown chart readings on the tape produced by bar graph line labeled with the same mark as on the scale of the device N399. Diagram for the drive belt used synchronous motor powered by AC mains
50Hz, 220V or DC 12 V via a separate transformer P39, available on request.
Devices national version on request can be made on line frequency 60Hz.
Mikroampermillivoltmetr recording N399 has seven travel speed chart tape 20, 60, 180, 600, 1200, 1800, 5400 mm / h, which are set by changing a couple of gears. Overall dimensions 230x180x315 mm. Unit weight is not more than 9,0 kg.