Replace battery on sperry dm6400 multimeter

Hello Anthony, I sent you a link so you can find out the manual of the tester Sperry DM-210a and another where you get an explanation of the operation
I hope you can solve your concern
Greetings Franco Dosil

Hola Anthony, te envio un link para que puedas descrgar el manual del tester Sperry DM-210a y otro donde te dan una explicacion del funcionamiento
Espero que puedas resolver tu inquietud
Saludos Franco Dosil

https://www.hunker.com/13414165/how-to-use-a-sperry-dm-210a-meter

https://greenlee-cdn.ebizcdn.com/media/52058078REV01.pdf

https://www.hunker.com/13407450/instructions-for-a-sperry-dm-210a

Refer to instructions that came with meter, it is there. If you threw away instructions here is a big hint.
https://www.manualslib.com/manual/1346232/Sperry-Instruments-Dm6450.html?page=6#manual

How to Use Sperry Voltmeter Hunker VISIT THIS LINK

remove battery door and replace battery (9V)

http://www.testequipmentdepot.com/sperry-instruments/pdf/dm6400.pdf

Are you connecting your leads to the proper terminals on the meter? There are, what, four of them? Easy to mix up.

If it still isn't working, then you might have a bad connector on your multimeter.

try cleaning terminals with compressed air just in case if there is some dirt inside, other than that you will need new meter

fill with baking soda and place in freezer. once the moisture and bacteria are gone they should smell better. consider washing insoles. allow to dry before replacing and try to keep the shoes dry to avoid oder

Sounds like an internal problem,bad resistor,diode,capacitor,something.
Here is a link to their customer service phone number.
http://www.sperryinstruments.com/navi/support
Good luck!

I assume a "DM-350a" is some kind of a digital multimeter. I Googled and found it might be a "A.W. Sperry DM350A 5 Function 17 Range Digital Multimeter" and looking at the ranges available on that meter, you can't really thest the battery "under load" the only reasonable way to test small batteries. the DC current only goes up to 200 milli amperes. A "C" or "D" size flashlight battery puts out 1 to 4 amps depending on conditions. That's 5 to 20 times the current readable by that meter. The volts on one of those batteries is probably 1.6 volts to 1.3 volts etc. If you live in the United States, I'd say go to Radio Shack and spend $5 to $15 and buy a battery tester like "Enercell Analog 9-Range Battery Checker, $14.99, Model 22-156, catalog # 22-156"
Then you and anyone in your family can read the instructions and test 8 or 9 different type batteries. Battery types: 1.5V button-cells, "AAA"/"N"/"AA"/"C"/"D", 6V, 9V, 12V, 15V and 22.5V..
This is not supposed to be an advertizement, and I have no interest in RadioShack,... but it's supposed to be instructional.

Small price, Good instruction to anyone who can read, and if anyone forgets, they can re-read. Testing a lot of batteries in a sitting goes very fast with these.

Differently, with the sperry, or any voltmeter, you'd have to select a resistor small enough to draw the current, and large enough not to overheat or burn, connect it and measure the loaded voltage drop, compare the voltage and current of the loaded battery, and compare it to that of a new battery, and a battery you might consider too weak for your application.. Voltage equals amps times resistance, and power equals amps squared times resistance... Really, buy a battery tester.
Regards --- GooseBay_Camper

dc .... no lower then the voltage range of the highest voltage of the battery.