Products > Test Equipment
New Siglent SP6150A - Passive probe 1.5 Ghz
folays:
https://siglentna.com/product/sp6150a-1-5-ghz-oscilloscope-probe/
--- Quote ---Bandwidth: 1.5 GHz (X10)
Input Resistance (Probe + Scope) 500Ω±10Ω
Input Capacitance 1.8pF
Scope Input Coupling 50Ω
--- End quote ---
Datasheet : https://siglentna.com/wp-content/uploads/dlm_uploads/2024/09/SP6150A_Datasheet_EN01A.pdf
--- Quote ---The SP6150A probes offer bandwidth of 1.5 Ghz and 10:1 attenuation ratio to address a wide range of measurement needs. For general purposing probing, the SP6150A's low capacitance, and low inductance ground connection keep probe loading low enough to achieve high signal integrity measurements. The SP6150A passive probe offer a low input capacitance, 1.8pF, for measuring fast edges more accurately, making it a good low-cost alternative to an active probe. The SP6150A probes are automatically recognized when connected to Siglent oscilloscopes.
Max. Input Voltage 8.5V
--- End quote ---
Also viewable in the "all probes list" at https://siglentna.com/products/accessories/probes/passive-probes/
folays:
So I am an amateur, can you please confirm my (very possibly wrong )understanding ?
* The SP6150A cannot AT ALL "replace" a SP3150A probe on a SDS3xxx HD
* They are both very different probes, very different tools, aimed at very different tasks
* Probes others than the SP5150A are generally intended to be used with the 1M Ohm input
* the 50 Ohm scope input is generally only useful if you want to match a coax of 50 Ohm impedance, to avoid reflections ?
* The scope 50 Ohm input can only dissipates 0.5 Watt, so that's why U = sqrt(P * R) == 5 V, the 50 Ohm input can only accept 5V
* Even transient spike above 5V can damage the 50 Ohm input, so if you were to use it, a 1:10 probe is a good idea
* The SP6150A is rated up to only 8.5V anyway, so if you were to be respecting this limit, it will present only up to 850mV on the 50 Ohm scope input
* The 500 ± 10 Ohm "input resistance (Probe + scope)" means that the probe has an internal 450 ± 10 Ohm resistance ?
And now for the unknown (for me) :
* Why the probe is listed as having an 1.8pF "input capacitance" whereas scopes have around'ish 15 pF ?
* Can the SP6150A probe ever be used on a SDS3xxxx HD ?
* Why does it seems to be using the 50 Ohm input ? Just because the output of the probe should not exceed 850 mV, well below the 5V, and that the 50 Ohm input has a more direct path to the ADC ?
Thanks & Best Regards,
bob1033:
Looks like what I would call a Z0 probe, you can look around the forum for various discussions about these. I think most of your understanding is correct.
* This probe is most likely just a low capacitance/inductance 450 ohm resistor connected to 50 ohm coax. The simple resistive tip keeps the tip capacitance (1.8pF) low which helps keep the frequency response flat til 1.5 GHz
* This probe needs to be used with 50 ohm termination only and to get the rated response the termination must occur inside the scope (AKA 50 ohm mode on the scope)
* Since you use 50 ohm termination with this probe, yes, you must limit the input signal since the scope is only rated 5V max on 50 ohm
* Since the probe is a resistor and a transmission line, we don't need to worry about the scope's input capacitance (15pF) since we are providing a good impedance match using the scope's 50 ohm termination
You should be able to use this probe no problem on the SDS3xxx HD. I use similar homemade probes on my SDS2000X+. Just be sure to use the 50 ohm termination mode in the channel setting and do not exceed the maximum voltage rating.
noisyee:
--- Quote from: folays on October 11, 2024, 02:29:17 pm ---So I am an amateur, can you please confirm my (very possibly wrong )understanding ?
* The SP6150A cannot AT ALL "replace" a SP3150A probe on a SDS3xxx HD
* They are both very different probes, very different tools, aimed at very different tasks
* Probes others than the SP5150A are generally intended to be used with the 1M Ohm input
* the 50 Ohm scope input is generally only useful if you want to match a coax of 50 Ohm impedance, to avoid reflections ?
* The scope 50 Ohm input can only dissipates 0.5 Watt, so that's why U = sqrt(P * R) == 5 V, the 50 Ohm input can only accept 5V
* Even transient spike above 5V can damage the 50 Ohm input, so if you were to use it, a 1:10 probe is a good idea
* The SP6150A is rated up to only 8.5V anyway, so if you were to be respecting this limit, it will present only up to 850mV on the 50 Ohm scope input
* The 500 ± 10 Ohm "input resistance (Probe + scope)" means that the probe has an internal 450 ± 10 Ohm resistance ?
--- End quote ---
Yes you are right, this is a very different probe than normal passive probe and aims at very different use conditions. They are a kind of trade off between bandwidth and probe load (more bandwidth than normal passive probe and less load than direct feed signal into 50Ω plus much much cheaper than active probes).
Transient spike with not too much over voltage would not cause damage to most oscilloscopes. But how should you know how much is too much for a particular oscilloscope. Better to follow the warring sticker.
--- Quote from: folays on October 11, 2024, 02:29:17 pm ---And now for the unknown (for me) :
* Why the probe is listed as having an 1.8pF "input capacitance" whereas scopes have around'ish 15 pF ?
* Can the SP6150A probe ever be used on a SDS3xxxx HD ?
* Why does it seems to be using the 50 Ohm input ? Just because the output of the probe should not exceed 850 mV, well below the 5V, and that the 50 Ohm input has a more direct path to the ADC ?
--- End quote ---
* Oscilloscope input capacitance specified at 1MΩ input, no meaning for 50Ω.
* Unlike passive high impedance probes, transmission line probes can be used on almost any instrument with 50Ω input, even a Spectrum Analyzer.
* They are designed to be used with matched 50Ω instruments. They have small low value resistor attenuator and matching network on the probe tip, which limited their input voltage.
tautech:
Critical info for SP6150A is on P8 of the datasheet captured below.
Put simply, these are a low voltage autosense 1.5 GHz Z0 10:1 probe for 50 Ohm input use.
SP6150A is a much cheaper option than an active probe when low probe tip loading is required.
I'll have some in a few weeks for tests.
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