I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one side
of small box integrated with connector, 1/1-1/10 with adjustment hole on
other side (calibration?). Three-position switch on probe marked 1 - 10 - G.
I assume this is 1x/10x multiplier/ground selector.

Google search no help. Can someone give me any info on these? Thanks.

"Ken_B" @ wrote in message ...
| I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one
side
| of small box integrated with connector, 1/1-1/10 with adjustment hole on
| other side (calibration?). Three-position switch on probe marked 1 - 10 -
G.
| I assume this is 1x/10x multiplier/ground selector.
|
| Google search no help. Can someone give me any info on these? Thanks.

Resistance tip to ground on each setting?

N

Ken posted:

I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one side
of small box integrated with connector, 1/1-1/10 with adjustment hole on
other side (calibration?). Three-position switch on probe marked 1 - 10 - G.
I assume this is 1x/10x multiplier/ground selector.

I agree; it sounds like scope probes. The adjustment compensates for the coax
attenuation. When using a scope clip the probe to the "calibrate" test pin and
observe the scope display. Rotate the variable capacitor via the adjustment
hole to display the best squarewave.

Don

Infinity on all three switch positions. Did see an apparent capacitor charge
on 1 and 10.

These probes have BNC connectors, by the way. I'm sure they're scope probes.
I was hoping to find some specs.

"NSM" wrote in message news:bd2xd.5740$KO5.2934@clgrps13...

"Ken_B" @ wrote in message ...
| I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one
side
| of small box integrated with connector, 1/1-1/10 with adjustment hole on
| other side (calibration?). Three-position switch on probe marked 1 -
10 -
G.
| I assume this is 1x/10x multiplier/ground selector.
|
| Google search no help. Can someone give me any info on these? Thanks.

Resistance tip to ground on each setting?

N

"Ken_B" @ wrote in message ...
| Infinity on all three switch positions. Did see an apparent capacitor
charge
| on 1 and 10.
|
| These probes have BNC connectors, by the way. I'm sure they're scope
probes.
| I was hoping to find some specs.

All you can do is connect them to a scope, tweak them with the scopes'
calibration port or a square wave generator and them measure the frequency
response with a good RF generator.

There are 5 million scope probes in the naked city - no way to find the
particular specs for these.

N

"Ken_B" bravely wrote to "All" (18 Dec 04 15:40:59)
--- on the heady topic of "Mystery probe"

Ke From: "Ken_B" @

Ke I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one
Ke side of small box integrated with connector, 1/1-1/10 with adjustment
Ke hole on other side (calibration?). Three-position switch on probe
Ke marked 1 - 10 - G. I assume this is 1x/10x multiplier/ground selector.

Ke Google search no help. Can someone give me any info on these? Thanks.

PR 200 is likely 200MHz since I know the PR 100 is 100MHz.
It's the best I can offer...

A*s*i*m*o*v

.... I lurk quietly and carry a big OFF/ON switch.

Thanks for the replies. The note about the PR 100 was helpful.

Ken

"Asimov" wrote in message
...
"Ken_B" bravely wrote to "All" (18 Dec 04 15:40:59)
--- on the heady topic of "Mystery probe"

Ke From: "Ken_B" @

Ke I've acquired a couple of probes marked "PR 200" & "PhilipsECG" on one
Ke side of small box integrated with connector, 1/1-1/10 with adjustment
Ke hole on other side (calibration?). Three-position switch on probe
Ke marked 1 - 10 - G. I assume this is 1x/10x multiplier/ground selector.

Ke Google search no help. Can someone give me any info on these? Thanks.

PR 200 is likely 200MHz since I know the PR 100 is 100MHz.
It's the best I can offer...

A*s*i*m*o*v

.... I lurk quietly and carry a big OFF/ON switch.