| Electronics > Beginners |
| Do it yourself 50 ohm BNC to alligator clip cable for function generator |
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| robsims:
Hi. i need a BNC to alligator cable for my function generator. I'm new to electronics and this is my first generator. I want to make the cable myself, because it will take up to 4 weeks to get a cable to my country. The local electronic shop doesn't have cables. I want to know if i'm on the right track. I bought a BNC connector, 2 meters of standard 50 ohm coax cable and a black and red alligator clip. What is the maximum length the cable can have? What do i need to do to make the cable perfect or what do i need to do to prevent making a poor quality cable? |
| tggzzz:
What frequencies and voltages do you want to use? The frequency determines the length, the voltage the cable type. As you are a beginner, I hope the latter is unimportant! |
| robsims:
I see on the net that a 50 ohm cable (coax cable) is the impedance of the cable itself. Do i need that cable, or a cable pair (normal cable) with a total resistance of 50 ohm? |
| robsims:
The generator is a siglent SDG 810. Max frequency is 10 mhz and max voltage is 20 volt pp. So i want to be able to do tests at max frequency and voltage |
| tautech:
--- Quote from: robsims on July 10, 2019, 09:13:10 pm ---The generator is a siglent SDG 810. Max frequency is 10 mhz and max voltage is 20 volt pp. So i want to be able to do tests at max frequency and voltage --- End quote --- Things to note, 20Vp-p is only available into a HiZ load. Whatever load setting you select, the source impedance is always 50 ohms. In the menus check that output protection is turned ON so that for a AWG beginner there is less chance of damaging the output stages if connection is to a powered circuit. The datasheet and manual has more info about this. For general LF and normal amplitude levels nearly any type of connection will work but for fast edges ringing can be a problem if the output is not terminated into 50 ohms. |
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