A NOVELTY! RECORDING GRAPHIC MULTIMETERS

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WHAT ARE GRAPHIC MULTIMETERS DESIGNED FOR?

When solving a number of research tasks in the field of repair and maintenance of various equipment, it is often necessary to record measured values, such as voltage or temperature, which continuously change over time.

Previously, mechanical recorders were used to solve this problem, but progress in the field of microelectronics and microprocessor technology has led to the creation of a new type of multimeters that are able to continuously record measured values and then display these values as graphs. Multimeters of this type are also called graphical, recording, or Datalogger multimeters. There are also multimeters with manual data recording, but only graphical multimeters provide display of graphs and trends.

TASKS SOLVED BY GRAPHICAL MULTIMETERS

Graphical multimeters are used for a number of tasks where it is necessary to store and analyze measured values for a certain period of time, for example:

Diagnostics of instability of any technological processes, where the immutability of a certain parameter affects the operability of equipment. In particular, the stability of the reference voltage or the immutability of the characteristics of the reference source.
Monitoring of measured values over time, such as supply voltages and temperature conditions.
Troubleshooting issues that occur from time to time. For example, the search for a sudden loss of voltage on any component in an electronic circuit.
Prevention of electrical systems, when some slowly changing parameters may indicate the need to replace or repair certain components. For example, batteries or capacitors.
Testing and testing of newly developed electronic devices to assess their reliability and stability over a sufficiently long period of time.
Checking and recording the operation of various sensors and converters of technological parameters to voltage, resistance or current.
Laboratory and educational research, when recording multimeters show the dynamics of processes, the dependence of certain quantities on time, and allow further use of the data obtained for documentation and deeper research.

PRINCIPLE OF OPERATION OF GRAPHIC MULTIMETERS

In general, recording multimeters resemble a recorder or an oscilloscope with a very slow scan, but the difference is that the time resolution is limited by the speed of the device. Multimeters typically take about 5 measurements per second, while oscilloscopes take several million measurements per second. This difference allows you to process the measurement results obtained from a multimeter in a simple and accessible way, for example, in Excel or Google tables.

UT181A IS AN EXAMPLE OF AN AFFORDABLE GRAPHICS MULTIMETER

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For example, consider the UT181A recording graphic Datalogger multimeter, manufactured by UNI-TREND Technology.

The device works like a conventional multimeter with increased accuracy, however, it is able to continuously record the measured values. The duration of the recording depends on the measurement interval set by the user, and can range from several days to a month or even more. The device allows both offline operation without connecting to a computer, and the export of previously recorded values to a computer via a built-in optical port with USB output. The device is equipped with its own software that allows you to transfer and save measurement results on any computer and then download these results to tables. In addition, it is possible to directly record readings into a computer. At the same time, the recording depth is no longer limited by anything, but only by computer memory and limitations in Excel. The UT181A recording multimeter has a degree of protection of IP65 and is applicable in industrial and field conditions.

REGISTER OF MEASURING INSTRUMENTS

The device has passed state tests for type approval of measuring instruments and is included in the Register of Measuring Instruments of the Republic of Kazakhstan, as evidenced by the certificate:

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