Laboratory calibrators of electrical quantities


Description

The calibrator includes traditional components and devices:

— reference voltage source (VS);

— digital-to-analog resistive converter (DAC), providing DC voltage conversion, the bit depth of which is determined by the required resolution of the calibrator (sixteen binary digits);

- a high-voltage amplifier operating at the playback limits of “1 V” and “10 V” as a buffer with a gain of 1 and operating at the limits of “100 V” and “1000 V” with a gain of 10 and 100 times, respectively.

The current calibrator mode is implemented by a circuit based on a U/I amplifier, the negative feedback circuit of which includes a load. The circuit converts voltage into current. The conversion coefficient is determined by the value of the reference resistor and the input voltage (from 0 to 0.2 V).

Structurally, the calibrator is a closed case with controls and a digital display on the front panel, where the output terminals are also located. On the rear panel there is a network connector with a fuse, a power switch, and a grounding contact.

Metrological characteristics depend on the stability of the parameters of the electronic radio elements used in the calibrator and are ensured by its circuit solutions. The calibrator has no components that require adjustment during operation.

A general view of the calibrator is shown in Figure 1. A diagram of sealing against unauthorized access, designation of places for applying verification marks in Figure 2.

The verification mark in the form of a sticker is applied to the free space on the front panel

Figure 2 - Scheme of sealing against unauthorized access, designation of places

applying verification marks

Differences

Laboratory calibrators of electrical quantities differ from other electrical measuring devices in their increased level of accuracy. A number of models are equipped with microprocessor control and a set of interfaces for exchanging data with computers. These devices have increased levels of productivity, which automates workflows and simplifies reporting.

Calibrators differ from each other:

  • A set of measured and generated parameters;
  • Range of reproducible parameters;
  • Accuracy and accuracy class;
  • Number of working channels;
  • Availability of analytical and other functions;
  • Design features - for use in the laboratory or in the field.

Software

The calibrator software is written into the microcontroller control program memory at the production stage and cannot be changed during the operation of the calibrator.

The software does not affect the metrological characteristics and sets the internal configuration of the calibrator's components, while ensuring that its operating mode corresponds to the mode specified by the operator.

There is no interface for pairing the calibrator with other digital devices, which makes it impossible to modify its software.

The software protection level is “high” in accordance with R 50.2.077-2014. Software identification data is given in Table 1.

Table 1 - Software identification data

Identification data (signs) Meaning
Software identification name n419.hex
Software version number (identification number) 1.1
Digital ID for calibration data and software*
Algorithm for calculating the digital software identifier*
* Columns are not filled in due to the lack of software affecting the metrological characteristics.

Table 2 — Metrological characteristics of the calibrator

Characteristic name Meaning
DC voltage reproduction range at reproduction limits (IP), V:

1 V 10 V 100 V 1000 V

from 0 to 0.99999 incl. from 1 to 9.9999 inclusive. from 10 to 99.999 inclusive. from 100 to 999.99 inclusive.
Discreteness of setting the DC voltage at the reproduction limits (IP), mV:

1 V 10 V 100 V 1000 V

0,01

0,1

1

10

Limits of permissible relative error of DC voltage reproduction within limits (Ip), ± (% of Im + % of Ip)

1V, 10V,100V, 1000V

0,05 + 0,002
Range of reproduction of direct current strength at the reproduction limit (1p) 200 mA, A, not less: from 0 to 0.19999 incl.
Discreteness of setting the DC current at the reproduction limit (1p) 200 mA, µA 10
Limits of permissible relative error of direct current at the reproduction limit (1p) 200 mA,

±(% of 1x + % of 1p):

0,06 + 0,01
Time to establish output readings with normalized error, s, no more 10
Time to establish the operating mode (warm-up), min, no more 30
Operating conditions:
— ambient air temperature, °C from + 10 to + 35 incl.
— relative humidity of ambient air at temperatures up to + 25 °C, %, no more 80
— supply voltage, V from 198 to 242 incl.
— industrial network frequency, Hz Notes

1 IP (1p) - voltage reproduction limits (power t

2 Their (1x) - reproducible values ​​of voltage (force

from 48 to 52 incl.

oka).

current).

Characteristic name Meaning
Maximum load current at rated value according to
errors at reproduction limits (ip), mA, not less:
1 V Limited Rout=0.07 Ohm
10 V, 100 V 50
1000 V 5
RMS value of pulsations at the output of the caliber -
torus, in the frequency band up to 5 kHz, within the playback limits
(ip), mV, no more:
1 V 0,2
10 V 0,5
100 V 1
1000 V 5
Format for presenting numerical information - values 5 decimal places
running voltage or current
Sinusoidal test voltage value,
frequency 50 Hz, maintained by electrical insulation between
between the mains circuits of the calibrator and the housing without breakdown and
surface covering, B, not less 1500
The value of the electrical insulation resistance between the circuits
calibrator power supply and its housing:
— under normal conditions of use, MOhm, not less 20
— at elevated temperature MOhm, not less 5
The value of electrical resistance between the grounding 0,5
contact of the power plug and the device body, Ohm, no more
Time of continuous operation in working conditions, h, not less 24
Power consumed by the calibrator from the power supply at
rated voltage, VA, no more 60
Requirements for the stability and strength of the calibrator to WHO
exposure to climatic factors and mechanical influences group 2 according to GOST 22261-94
Parameters of reliability, durability and maintainability
calibrator:
— mean time between failures, h, not less 20000
— gamma-percentage resource, at g = 90%, h, not less 20000
— gamma-percentage service life, at g = 80%, years, not less 15
— gamma-percentage shelf life, at g = 80%
for heated storage facilities, years, not less 10
for unheated storages, years, not less 5
— average time to restore working condition,
min, no more 60
— probability of no hidden failures within 24 months
with an average utilization rate of 0.23, no less 0,9
Characteristic name Meaning
Calibrator weight, kg, no more 3,5
Weight of the calibrator in consumer packaging, kg, no more 5,5
Overall dimensions of the calibrator (length x width x height), mm, no more 257x308x102

Table 4 - Permissible voltage values ​​of the IRP

Frequency band, MHz Voltage Uc, dB (relative to 1 µV)
Quasi-peak value Average value
From 0.15 to 0.5 incl. From 66 to 56 inclusive. From 56 to 46 incl.
St. 0.5 to 5 incl. 56 46
St. 5 to 30 incl.

Notes

1 At the cutoff frequency the norm is m

2 In the frequency band from 0.15 to 0.5 MHz include: Uc = 66 - 19.1lg f / 0.15 for quasi-peak average values, where f is the measurement frequency in meg

60

lower voltage value permissible values ​​of new values ​​and Uc = 56 hertz.

50

NIIA IRP. voltage calc - 19.1lg f / 0.15 for

Table 5 - Permissible field strength values ​​of the IRP

Frequency band, MHz Field strength, dB (relative to 1 µV/m), quasi-peak value
From 30 to 230 incl. 30
St. 230 to 1000 incl.

Note - at the boundary frequency of the IRP field.

37

the norm is a lower tension value

Completeness

The complete set of the calibrator is indicated in Table 6.

Table 6 — Contents of the calibrator delivery kit

Designation Name Col. Note
MEASURE.411572.002 Constant voltage and current calibrator N4-19 1
Spare parts and accessories (SPTA)
MEASURE.685061.008 Connecting cable 1 Black, pin - pin
MEASURE.685061.008-01 Connecting cable 1 White, pin - pin
MEASURE.685061.010 Connector 1 Red, pin - pin
MEASURE.685061.010-01 Connector 1 Black, pin - pin
Fingerguard Shrouded 446-967 red Crocodile 1 Red
Designation Name Col. Note
Fingerguard Shrouded 446-967 black Crocodile 1 Black
OYu0.481.005 TU Fuse link VP2B-1V 2.0A 250 V 2 Network
H05VV-F Connecting cord 1 Network
BESKIN 1901/1 Medium case, black (includes shoulder strap) 1 For storage and transportation
Operational documentation
MERA.411572.001RE Constant voltage and current calibrator N4-19. Manual. 1
MEASURE.411572.001FO Calibrator N4-19 constant voltage and current. Form 1

calibrators

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Verification

carried out according to the document MERA.411572.001 RE “Calibrator of constant voltage and current N4-19. Operating manual", section 4 "Verification", approved by the Federal Budgetary Institution "Krasnodar CSM" on October 5, 2016.

The main means of verification are given in Table 7.

Table 7 - Main means of verification

Name Type of measuring instruments Registration number
1 2 3
Working standard 3rd category according to GOST 8.027-2001
Working standard of the 3rd category by order of Rosstandart dated February 15, 2016. No. 146
Multimeter (2 pcs.) B7-64/1 16668-97
Electrical resistance coil P321 1162-58
Multi-valued measure of electrical resistance of direct current P3026 8478-81

It is allowed to use similar verification means that ensure the determination of the metrological characteristics of calibrators with the required accuracy.

Verification marks are applied to the screws securing the upper and lower covers of the calibrator housing. The verification mark in the form of a sticker is applied to the free space on the front panel.

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