I am repairing an old EICO tube type Volt/Ohm meter.

The parts list calls out one resistor that I need to buy as a "15 Megohm BTS resistor". What is a BTS resistor and where do I find them?

Oak ridge...Tenn ? if active with the lab's?.....you should already know.

In the mil spec variety of their 5905- series that is the jargon of the "RESISTOR,FIXED,COMPOSITION"category.
If you need further info provide the EICO model number
for further research on its precise specific application.

:Oak ridge...Tenn ? if active with the lab's?.....you should already know.
:
:In the mil spec variety of their 5905- series that is the jargon of the "RESISTOR,FIXED,COMPOSITION"category.
:If you need further info provide the EICO model number
:for further research on its precise specific application.

edd,
Thank you for the response. No, Oak Ridge, North Carolina and there ain't no labs here.

The device is an EICO Mod. 221 VTVM. The resistor is the one that goes in the DC Volts test lead probe. I don't have that test lead and need to make one. To make it I need a 15 megohm BTS resistor.

Any help would be appreciated.
Mac

Just use a garden variety resistor. It doesn't carry any current, so wattage doesn't matter. Find one that will fit whatever you're going use for a probe.

:Just use a garden variety resistor. It doesn't carry any current, so wattage doesn't matter. Find one that will fit whatever you're going use for a probe.

If this is for a high voltage probe use qty 15 1 megohm resistors in series. If it is for under 600 volts use a single resistor. The series arrangement prevents arc over.

MRO

::Just use a garden variety resistor. It doesn't carry any current, so wattage doesn't matter. Find one that will fit whatever you're going use for a probe.
:
:If this is for a high voltage probe use qty 15 1 megohm resistors in series. If it is for under 600 volts use a single resistor. The series arrangement prevents arc over.
:
:MRO

Thanks to all for the responses. It is below 600v. From what everyone has said I gather I can use an ordinary carbon resistor like I would find in any radio. If I don't have that right, please jump back in.
Mac

Isn't the high voltage probe usually for voltages above 1,000? If under 600, though, yes, an ordinary resistor will work.

T.

EICO Mod. 221 VTVM.

<<<<<<<>>>>>>>>>>>>>

I am surely thinking that value SHOULD be read as
1.5 megohm 1/2 watt common Allen Bradley or Ohmite composition carbon resistor.

And apparently you were trying to use the same schematic with its poor pixelating resolution at the mag that it was duplicateded to.

In the case of that series resistor in the DC probe... they are almost universally in the range of a 1 meg unit with some units...eg RCA .. incorporating a leaf shunt switch across it in the AC ohms range[that switch construction being troublesome after long,repeated use]. Thereby permitting the use of a single probe, or some other brands have it built into an add on / end plug on tip extension that is plugged into the main probes end for the DC mode.

If you are mechanically inclined you might dupe either of these techniques in your custom construction
of an unitized unit.

73's de Edd

Hi Mac

You should have the 15 meg in a couple days. If it should be 1.5 meg I also have those.

Norm

:EICO Mod. 221 VTVM.
:
:<<<<<<<>>>>>>>>>>>>>
:
:I am surely thinking that value SHOULD be read as
:1.5 megohm 1/2 watt common Allen Bradley or Ohmite composition carbon resistor.
:
:And apparently you were trying to use the same schematic with its poor pixelating resolution at the mag that it was duplicateded to.
:
:In the case of that series resistor in the DC probe... they are almost universally in the range of a 1 meg unit with some units...eg RCA .. incorporating a leaf shunt switch across it in the AC ohms range[that switch construction being troublesome after long,repeated use]. Thereby permitting the use of a single probe, or some other brands have it built into an add on / end plug on tip extension that is plugged into the main probes end for the DC mode.
:
:If you are mechanically inclined you might dupe either of these techniques in your custom construction
:of an unitized unit.
:
:73's de Edd
:
: