Products > Test Equipment
Probe into probes. What's up?
BillyO:
--- Quote from: bomp on January 31, 2023, 10:46:02 pm ---Does the Bodnar pulser need a 50 ohm load when the 10:1 probes are used?
--- End quote ---
Shouldn't, as it's not driving a 50 ohm transmission line.
BillyO:
Here are soem more images.
The No-name P6139A
Two pictures of the Tek probe disassembled. In the picture where I have the metal case apart you can see the two HF resistors at the bottom. The LF compensation is near the center and There is that blue object just above it and to the right. It's marked C2, but there is not way to get anything into it to adjust it. It may need a special tool.
The last picture is the tesr setup with the Bodnar. It's exactly the same with my pulser too as it's just about the same size.
srb1954:
--- Quote from: BillyO on January 31, 2023, 11:26:02 pm ---
--- Quote from: bomp on January 31, 2023, 10:46:02 pm ---Does the Bodnar pulser need a 50 ohm load when the 10:1 probes are used?
--- End quote ---
Shouldn't, as it's not driving a 50 ohm transmission line.
--- End quote ---
I don't know what terminating load the Bodnar pulser requires but the conditions for verifying probe performance traditionally calls for a 25 \$\Omega\$ source (ref. Tektronix Circuit Concept series, Oscilloscope Probe Circuits, p27). This source impedance is typically made up of the pulse generator source impedance of 50 \$\Omega\$ paralleled by a 50 \$\Omega\$ through termination. So even if you are not using a interposing cable the output of the pulse generator still requires a terminator.
tautech:
--- Quote from: srb1954 on February 01, 2023, 12:50:46 am ---
--- Quote from: BillyO on January 31, 2023, 11:26:02 pm ---
--- Quote from: bomp on January 31, 2023, 10:46:02 pm ---Does the Bodnar pulser need a 50 ohm load when the 10:1 probes are used?
--- End quote ---
Shouldn't, as it's not driving a 50 ohm transmission line.
--- End quote ---
I don't know what terminating load the Bodnar pulser requires but the conditions for verifying probe performance traditionally calls for a 25 \$\Omega\$ source (ref. Tektronix Circuit Concept series, Oscilloscope Probe Circuits, p27). This source impedance is typically made up of the pulse generator source impedance of 50 \$\Omega\$ paralleled by a 50 \$\Omega\$ through termination. So even if you are not using a interposing cable the output of the pulse generator still requires a terminator.
--- End quote ---
100%
If it weren’t for a darn power cut I’d put some screenshots up showing exactly this. :-+
BillyO:
I could certainly try that.
Edit: Well! That just made one heck of a difference! This is more like what I expected. With the Tek probe being the best the Hantek the worst and the no-name 6139A being in between.
So that Hantek 300MHz probe is really a 300MHz probe. The no-name P6129A looks like it would come in around 400MHz and the Tek's rise time is exactly what I calculated it should be @ 500MHz. Nice.
Shot in the same order as before: Hantek, Tek, No-name.
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