Battery eliminator vintage ohmmeter

[Tj138waterboy]

I recently aquired an old KS-8455 volt/ohm meter used for telco cable testing. It appears in excellent working condition minus I do not have the proper 45 volt battery to power it normally. The Eveready No. 455, NEDA 201, 45 Volt is available but pricey. Would there be any drawbacks to using a step-up boost dc to dc module that has ability to go up to the 45v or close. I know switching frequency is very high but imput impedance of this meter is 430 ohms. Would needle deflection even be suceptable to that fast of frequency if boost module is used?

[Gregg]

Stack some 2032 lithium coin cells until you have 45 volts, they are cheap in lots of 20 to 50 cells on Amazon.  You will have a cheaper higher power density battery than the old carbon zinc one.  If you are lucky they may even fit into the old battery wrapper and look like they belong.

[Tj138waterboy]

 I would but the meter didn't come with battery. Just made more sense to me to use li-ion or lipo cells and boost converter. I think the original 45v battery was only around 300-500mah. Average single lipo is probably 1500-2000mah.
Also my meter has a metal battery holder mounted to the gauge which is removable to allow more room if needed. I haven't seen any pics posted online with this feature.

[schmitt trigger]

I think it could actually work.
The best way to find out is to actually purchase a cheap e-bay converter and do some testing.

Do you have any idea of the expected current load @ 45 volt?

[Tj138waterboy]

Just checked and across the leads measures 100k ohms. So .45 milliamps or .02 watts I believe worst case scenario with shorted leads. I think any module that can output 100mA should work a treat.

[bob91343]

Consider the use of a salvaged wall mount supply.  They aren't usually well regulated but a little TO-220 style cheap regulator has worked well for me.

I use them on my old fashioned analog VOMs for the Ohms ranges.  The only down side is loss of portability.