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Test Equipment Anonymous (TEA) group therapy thread
GerryBags:
I have a couple of new 75 Ohm panel mount BNC's from Amphenol if you need one, Specmaster? They came in a joblot.
Specmaster:
--- Quote from: bd139 on May 03, 2018, 10:36:58 pm ---I’d stuff a 75 ohm BNC on the generator straight up and build the pad inside a Pomona box you plug into it. Then when you get something else 75 ohm it’ll be useable as well.
I’d ony do this to the RF out.
--- End quote ---
Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?
Also of course when using the signal generator for setting up radios, whats the impedance there when the terminations are more likely going via small crock clips?
Specmaster:
--- Quote from: GerryBags on May 03, 2018, 10:42:44 pm ---I have a couple of new 75 Ohm panel mount BNC's from Amphenol if you need one, Specmaster? They came in a joblot.
--- End quote ---
thanks, I'll get back to you on this, I'll guided by bd139 on if I actually need to do this as he's more in to this more than I am as ham operator.
tautech:
--- Quote from: Specmaster on May 03, 2018, 11:02:21 pm ---
--- Quote from: bd139 on May 03, 2018, 10:36:58 pm ---I’d stuff a 75 ohm BNC on the generator straight up and build the pad inside a Pomona box you plug into it. Then when you get something else 75 ohm it’ll be useable as well.
I’d ony do this to the RF out.
--- End quote ---
Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?
Also of course when using the signal generator for setting up radios, whats the impedance there when the terminations are more likely going via small crock clips?
--- End quote ---
There are probes that specify they must be terminated into 50 \$\Omega\$.
Without an internal 50 \$\Omega\$ input you then need used a feed through.
tggzzz:
--- Quote from: Specmaster on May 03, 2018, 11:02:21 pm ---Still a little puzzled about this seeing as the only 50 ohm inputs I have are the TF930 and the HP1740A which is switchable between 50ohm and 1M, all the other scopes tend to be 1M and also of course the TF930 can also be switched between 1M and 50ohm. If IIRC the only time the 50ohm input on the 1740A gets mentioned really is on some specific calibration tests?
--- End quote ---
The excellent "low" impedance Z0 "resistive divider" probes have to be terminated in 50ohms, as do other classes of probes.
Those are actually a higher input impedance than so-called "high" impedance *10 probes (when input capacitance is included), and have a much higher bandwidth. Examples: 1.5GHz HP10020A or 6GHz HP54006A.
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