| Electronics > Repair |
| Please help, FLUKE 8920A Multimeter Repair |
| << < (18/45) > >> |
| daisizhou:
I have a question,For example R29,The voltage on the left is -7.328,The voltage on the right side is -7.326,Do I need to measure one to one according to the schematic?Or is it still effective if left and right are reversed? Can I measure the input interface BNC in+ and in-? Because I don’t know the pin definition of Q9A、Q9B When measuring, I still choose to disconnect the BNC input interface as before, right? Do I need to connect a 50 ohm load? Because there will be interference when disconnected |
| Harry_22:
Fluke 27 is Ok. I don't need high precision. Concerning drawing with R29 measure collector Q13 and VR3. Please round the values 7.326 to 7.3, 7.967 to 8.0, 12.732 to 12.7 and so on. Measure around Q17, Q19; Q11, Q16; Q8 both, Q10, Q12. Also R33, R39, In+, In-. Connect 50 Ohm to the input and monitor the malfunction - +8.6V at the ouput. |
| daisizhou:
Hello, I found that the voltage changes and is not a stable value.I don't know which point in time test is accurate. The voltage increased from 1.46 to 1.651 and then increased to 1.806.The same goes for other voltages. When the final screen displays 0.01, the voltage displays the highest value.(I connected a 50 ohm load) I don't know how to measure Does measuring these voltage values need to be measured under fault conditions? Or is it measured under normal conditions? |
| Harry_22:
Please measure all the voltages under fault conditions. |
| daisizhou:
for example,For the test point on the right side of R17,Also in fault condition,The voltage changes from 1.46v to 1.651v,Should I log 1.46 or 1.651? Usually I test one resistance and then test the next one. I cannot complete multiple resistance measurements at the same time. When I measure the test point on the right side of R17, the voltage is 1.46,Then I measured the voltage on the right side of R13 to be 1.851,The actual voltage on the right side of R13 is 1.72. All voltages are changing slowly and I can't guarantee whether these measurements make sense. so i'm lost :palm: |
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