The detection methods of withstand voltage testers (also called withstand voltage testers or withstand voltage breakdown testers) and electronic measuring instruments involve many aspects. The following is a detailed description of the detection methods of these two instruments:

1. Detection methods of withstand voltage testers
Withstand voltage testers are mainly used to test the insulation strength of electrical equipment. Its detection method usually includes the following steps:

Appearance and function inspection:
Check whether the panel, casing, or nameplate of the withstand voltage tester contains the product name and model, manufacturer name or trademark, type approval certificate number, manufacturing date, factory number, accuracy grade, voltage range, nominal capacity, and other signs and symbols.
Check whether there is an obvious high-voltage output sign and other necessary signs at the high-voltage output end and whether the tester with an ungrounded low-voltage end has a clear sign.
Check whether there is a clear grounding terminal on the casing.
Check whether the preset, cut-off, alarm, reset, and timing functions of the tester are normal.
Set test conditions:
Set the output voltage, leakage current alarm value, and test time of the withstand voltage tester according to the rated voltage and insulation requirements of the equipment under test.
Connect the device under test:
Connect the power supply terminal of the device under test to the high-voltage output terminal of the withstand voltage tester, and connect the ground terminal of the device to the ground terminal of the tester.
Make sure the connection is firm and reliable to avoid short circuits or open circuits during the test.
Start the test:
Press the start button of the withstand voltage tester to start the test.
Observe the tester's voltmeter and ammeter to ensure that the test voltage and current are within the set range.
Observe the test results:
During the test, if the leakage current of the device under test exceeds the set alarm value, the withstand voltage tester should issue an alarm signal.
Record the test results, including test voltage, leakage current, and test time.
Close the test and process the results:
After the test, press the reset button of the withstand voltage tester to turn off the test voltage.
Determine whether the insulation strength of the device under test is qualified based on the test results.
2. Detection methods of electronic measuring instruments
There are many types of electronic measuring instruments, and their detection methods vary depending on the type of instrument and measurement requirements. Here are some common detection methods:

Direct measurement method:
Use an indicating instrument that directly points out the measured size for measurement, and can read the measured value directly from the instrument dial or from the display.
Applicable to instruments that directly read values, such as voltmeters, ammeters, and resistance meters.
Indirect measurement method:
When the measured data cannot be directly measured for some reason, the physical quantity that has a certain functional relationship with the measured data can be directly measured, and then the measured value can be calculated based on the functional relationship.
Applicable to instruments that need to be calculated or converted to get the final result, such as oscilloscopes, spectrum analyzers, etc.
Comparison method:
Directly compare the measured value with the standard quantity in the comparison instrument to obtain the measured value.
Applicable to occasions requiring high-precision measurement, such as calibrating voltmeters, ammeters, etc.
Calibration and verification:
Electronic measuring instruments should be calibrated and verified regularly to ensure the accuracy and reliability of their measurement results.
Calibration and verification should be carried out in accordance with national or industry standards, and qualified calibration equipment and standard substances should be used.
Safety protection:
When using electronic measuring instruments, you need to pay attention to safety protection measures, such as grounding protection, high voltage warning, etc.
Ensure that the instrument will not cause damage to personnel or equipment during use.
In summary, the detection methods of withstand voltage testers and electronic measuring instruments involve many aspects, including appearance and function inspection, setting test conditions, connecting the device under test, starting the test, observing the test results, closing the test, and processing the results. In actual applications, the appropriate detection method should be selected according to the specific instrument and measurement requirements, and the operation should be carried out in accordance with relevant standards and specifications.