YB28VA DC voltmeter-ammeter with measuring current through CT (Holzer meter)

The advantages of using the Holzer meter, sensor, convenient connection, can be connected to the positive, can also receive negative, can measure the discharge current, the charging current can also be measured, bidirectional measurement, no independent isolated power supply, the wiring is convenient, as long as you can between the DC power supply 4-30V.
The meter YB28VA includes: LED display table, current transformer CT, no need to buy shunt

Detailed view on voltmeter-ammeter YB28VA:

  • The dual table small size, “at the same time, with the screen” shows real-time voltage, current value
    Has potentiometer for voltage calibration (PCB back)
  • Also have a current calibration potentiometer, if error, can be their own calibration, but also with a “zero” potentiometer.
  • Current sensor transforemer with perforated design, the wire directly through the hole through the need to cut the wire, without damage, without changing the original current line can achieve the current measurement, breaking the use of shunt ammeter all the limitations.
  • Because the current sensor and the measured wire is completely isolated from the electrical, so this table can be free to measure the power supply positive, negative, line in a line or device current, do not worry about the common problem of ammeter
  • Can be measured line positive and reverse current, positive when the display “positive” current (ammeter decimal point is still bright or not lit), reverse shows “negative” current (ammeter decimal point slow flash).
  • High reliability, high current shock resistance, will not be damaged by current shock ammeter
  • And the measured voltage between the wire as high as: 2KV
    The meter is equipped with three wiring, easy access to solar system / car / battery car / motorcycle car line, used to monitor the battery voltage, the battery in time to grasp the charge and discharge status can also be used for other products voltage, current measurement purposes

Calibration method:

   The relative error between the instrument and the instrument, or after long-term use, due to the aging of the components or changes in environmental temperature caused by the error can be calibrated by the following methods, in order to get more accurate measurement, it is recommended to preheat more than 5 minutes re-calibration.

Current calibration:
In the absence of current flow conditions, with a flat-blade screwdriver to adjust the “transformer” behind the “zero” potentiometer until the ammeter decimal point quickly shines for the best point; bright or no light that zero positive, slow flash Description zero bias
And then load the actual measured current value of half of the conditions, adjust the “transformer” side of the “amplitude modulation” potentiometer, until the same with the standard table
The test accuracy requirements are high, you can repeat the above two steps, you can get a higher accuracy

Voltage calibration:

In the actual measured voltage half of the conditions, with a screwdriver to adjust the “meter” within the voltage calibration potentiometer, until the same with the standard table.

Here is schematic diagram

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