| Electronics > Repair |
| Fluke 179 problem measuring resistance |
| (1/4) > >> |
| neskor:
Hi. I recently received Fluke 179 in great condition, but in Auto mode doesn't want to measure resistance. Strange, it measure correctly if I first power off the meter and then connect probes to resistance and then power on the meter, in that case it measure OK, but once I disconnect the probes from resistance and try again (while the meter is still powered) to measure it doesn't measure. Also workls OK if I switch from capacitance or other measurment back to resistance. Anyone has a clue what is the problem. Thanks in advance! |
| neskor:
Tried this troubleshooting from the other posts: 1) The three MOVs all measure infinite resistance using another Fluke 87V multimeter. 2) The green fusible resistor just below the three MOVs measure roughly 1k ohm. 3) The black PTC just above the volt/ohm jack measure around 1.1k ohm. 4) With fluke 87V in mVDC mode I'm getting 4.2M, it should be 10M ohm? 5) It VDC mode. With another Fluke meter I measured around 11.11M ohm. 6) Tried to measure a 1.5 AA cell, and 179 shows 1.6 VDC, confirmed the same value with working Fluke 87V |
| neskor:
some pictures of the PCB |
| m k:
Seems that something is loading but not unloading correctly. Capacitance mode should also has an active internal voltage, same with frequency. Maybe one switch has a problem. |
| neskor:
Tried to measure capacitance, DC and mVDC and results are good. Temperature measurments are less valid, around 5C error. And doesn't want to measure frequency of AC signal. :-// |
| Navigation |
| Message Index |
| Next page |