The detection methods of dielectric loss testers and electronic measuring instruments mainly involve direct measurement, indirect measurement, and specific testing techniques and steps. The following is a detailed description of the detection methods of these two instruments:

1. Detection method of dielectric loss tester
The dielectric loss tester is an intelligent instrument used to measure the dielectric loss tangent value (tgδ) and capacitance value (Cx). Its detection method mainly includes the following steps:

Preparation stage:
Ensure that the connection between the tester and the device under test is correct, including the connection between the standard loop and the test loop.
Set the parameters of the tester, such as high voltage output value, measurement range, etc.
Measurement stage:
Start the tester, and according to the positive/reverse wiring setting, the measurement circuit will automatically select the input and switch the range according to the test current.
The standard loop current and the test loop current amplitude and phase are measured by the measurement circuit respectively.
The tester uses a digital real-time acquisition method to obtain the capacitance value and dielectric loss tangent value of the test product through vector calculation.
Data processing and result analysis:
The tester will perform multiple measurements and automatically select an intermediate result as the final result.
The measurement results can be printed or saved for subsequent analysis.
2. Detection methods of electronic measuring instruments
The detection methods of electronic measuring instruments vary due to their types and uses, but generally include the following basic methods:

Direct measurement method:
During the measurement process, the measurement can be directly compared with the same standard quantity, or the measurement can be directly measured with a pre-calibrated measuring instrument to obtain the value directly. This method is suitable for instruments that can directly read the value, such as voltmeters, ammeters, etc.
Indirect measurement method:
When the measured value cannot be directly measured for some reason, the physical quantity with a certain functional relationship with the measured value can be directly measured, and then the measured value can be calculated according to the functional relationship.
This method is suitable for instruments that need to be calculated or converted to get the final result, such as resistance boxes, capacitance boxes, etc.
Combined measurement method:
When a measurement result needs to be expressed with multiple unknown parameters, multiple measurements can be performed by changing the measurement conditions, and the equations can be listed according to the functional relationship to obtain the unknown quantity.
This method is suitable for instruments that need to measure multiple parameters at the same time and perform complex calculations, such as oscilloscopes, spectrum analyzers, etc.
3. Specific test techniques
For dielectric loss testers and electronic measuring instruments, there are also some specific test techniques that need to be paid attention to:

Anti-interference measures:
When conducting dielectric loss tests, anti-interference measures need to be taken to ensure accurate measurements under external electric field interference.
Electronic measuring instruments also need to have anti-interference capabilities to cope with complex electromagnetic environments.
Calibration and verification:
Dielectric loss testers and 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 materials should be used.
Safety protection:
When conducting dielectric loss tests, necessary safety protection measures need to be taken, such as grounding protection, high voltage warning, etc.
Electronic measuring instruments also need to have safety protection functions, such as overcurrent protection, overvoltage protection, etc.
In summary, the detection methods of dielectric loss testers and electronic measuring instruments involve multiple aspects, including direct measurement, indirect measurement, combined measurement, and specific test techniques and steps. In practical applications, appropriate detection methods should be selected according to specific instruments and measurement requirements, and operations should be carried out in accordance with relevant standards and specifications.