How to use a digital multimeter to detect frequency and temperature?

1.Method for frequency detection.

Some digital multimeters now have frequency detection baffles (e.g., UT58C handheld digital multimeters, etc.). When this kind of digital multimeter is used to detect the frequency, the range conversion switch is converted to the frequency 2k/20k position, and the range is selected according to the detection frequency.

    The frequency detection function of general digital multimeter is only suitable for detecting low-voltage frequency (such as audio signal), and the sensitivity of test input is in mV level. If the detected frequency signal voltage is too high, in addition to the detection of inaccurate results, it will also lead to digital multimeter protection circuit damage.

   In addition, instructions for the use of digital multimeters with frequency detection functions generally indicate "maximum input sensitivity values (e.g., maximum input sensitivity values ≤ 30Vrms for UT58C handheld digital multimeters)", This means that the voltage range of the detected frequency signal should not exceed the valid value of 30V (for example, UT58C handheld digital multimeter).

2.Method for detecting temperature.

Most of the temperature detection functions of the common digital multimeter are designed according to the temperature characteristics of the K-type thermocouple. Most of the detected ranges can range from -40~1000 ℃, but with the multimeter being equipped with the K-type thermocouple, the temperature is as low as that of the K-type thermocouple. The temperature sensing range is -40 ~ 250 ℃. Therefore, in the use of digital multimeter to detect high temperature, it is necessary to select and purchase high temperature thermocouple to ensure the accuracy of the test results.

This article is from Allicdata Electronics Limited