Dear All

I have got a spare multi meter (secondary one) that was sitting on shelf for couple of years and today I switched one to check if battery is dead or not and it was displaying reading on LCD,,,,but I thought it is good idea to replace battery although it wasn't dead to avoid any feature leaking

I replaced old battery with new one (yes new one and I checked voltage of it by using my primary fluke mutilimeter and it was reading 9.6V) but unfortunately multimeter not displaying anything on its LCD and used the old battery which was working again but same issue no display

I checked two fuses by looking at the them internal wire is not broken and no smoky/cloudy appearance, or a dark brown/black stain on the glass (I don't have spare fuse to check)

What else need to be checked ?

Thx

 

Blown fuse will not prevent the DMM display from turning on. First things to check are the snap connectors on the battery. Clean them if they look dirty. Make sure that they fit tightly on the battery terminals.

With a working DMM set to read DC voltage, measure the voltage where the red and black battery wires are soldered on to the dead meter board. If you measure 9 VDC at the solder joints, the next step is to clean the rotary switch and contacts with isopropyl alcohol.

 

Thx MrChips for your guide
1-Battery terminal fit tightly on the sap connector and the snap connector is clean
2-I checked the continuity between the connector end and the soldered end on PCB for both red and black wires they were good
3-But when I did the reading on the soldered end of red and black wires was showing 1.54 V !!!! supposed to be same v as battery

 

With the battery still connected to the battery clip, measure the voltage across the battery at the battery clip.

Next measure the voltage between the ends of the red wire, from one battery clip to the circuit board.

Do the same with the black wire.

There must be some resistance that has developed somewhere in the battery connection and wires.

Or the battery is bad.

 

Hi zillah,
Did you inadvertently place the battery incorrectly, then find the connections touched but didn't match?
It can happen to anyone.
Good luck............

 

Hi twohats I don't remember i had done that

 

With the battery still connected to the battery clip, measure the voltage across the battery at the battery clip.

Reading 9.58V

Next measure the voltage between the ends of the red wire, from one battery clip to the circuit board.

Almost zero

Do the same with the black wire.

Almost zero

There must be some resistance that has developed somewhere in the battery connection and wires.

Today my primary fluke was reading low battery and I used the new battery that supposed to be for my secondary none brand mulimeter and fluke is working finewith no issue

Or the battery is bad.

I am going to buy Energizer ultimate (supposed to be leak approved) and see how it goes

 

If the reading at the soldered inputs is 1.54 V then there must be a loss of 9.56 V - 1.54 V along the way somewhere between the battery and the circuit board. A voltage of 8.02 V cannot just disappear. You are doing something wrong.

 

If the reading at the soldered inputs is 1.54 V then there must be a loss of 9.56 V - 1.54 V along the way somewhere between the battery and the circuit board. A voltage of 8.02 V cannot just disappear. You are doing something wrong.

Agree but I don't know why the lost is happening ? could be soldering issue