hello friends,

I got a Systron Donner Counter/Multimeter 6130.
What kind of probe is to use at the SMA plug please ?
I dont know if SHF will be useful to me, but I need it complete. This machine is fast enough to count the microwave in the kitchen

greetings
Martin

Microwave counters generally have 50 ohm coax inputs. No probe is used. Just a 50 ohm source within the required level range. Whatever you do, don't exceed the maximum signal input level specified for your counter.

-Chuck

hello Chuck, thank you,

data, input C,

range, 500MHz to 26.5GHz
input sensitivity -25dBm 10GHz to -10dBm 26.5GHz
maximum input load +20dBm

I have no Voltmeter what can work at so extremly high frequencys.
The counter works perfect on Input A, B up to 500MHz. I have no useful idea for the microwave range.

it have a GPIB Interface for computers.
I never owned a gear like that.

greetings
Martin

It's more likely to be a type N female connector on the counter for the microwave input above 500 MHz. Very few hobbyists have any use for anything above 500 MHz, but there still aren't any special considerations if you want to use the range, (I'll probably get ARF'ed about shielding by others for very low level inputs, but I'm talking layman's terms here) and you can use a type N male to BNC adapter on that input. SD made good counters, although their service data can be hard to come about. Now you have to build yourself an interface bus computer LOL!

-Mark-

CORRECTION: I think you meant to type BARF - Boat Anchor Radio Forum

It's a fact that using anything other than a nixie display counter on a BA can severely upset the applecart.

-Mark-

Two quick comments: remember that +20dbm is 2.5 volts (approx) across 50 ohms. Anything higher will destroy the counter input. If in doubt of what levels you have, keep a 10 or 20 db attenuator on the input for protection.

More important - if the microwave input is working, you probably can sell that counter for enough cash to equip an entire radio workbench.

--Chuck

That is very true.

-Mark-