There are a few possible reasons for unstable test results.
First, we need to check if there is an issue with TOS5300 series itself.
How to check:
- Perform a test by directly connecting the test probes to an object with a known resistance value.
- If the results are stable with the known resistance, TOS5300 series is likely working properly and the issue may be elsewhere.
Note: If the issue persists, TOS5300 series may require calibration or repair.