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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Austin,
Any cheapo 20mhz scope will do fine for testing out any solid state tesla coil. Sure it may not have the bells and whistles as other scopes, but there are plenty of scopes on EBAY for less than $100.00 that will do the job.
The only one requirement you will want is the capabiliity for 2 channels where you can add them together. This is VERY important as it allows differential measurements. Basically, you'll hook one probe on CH1, the other probe on CH2, and then set function to ADD and INVERT CH2. This way you can measure signals which are not referenced to ground.
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
EastVoltResearch wrote ...
Austin,
Any cheapo 20mhz scope will do fine for testing out any solid state tesla coil. Sure it may not have the bells and whistles as other scopes, but there are plenty of scopes on EBAY for less than $100.00 that will do the job.
The only one requirement you will want is the capabiliity for 2 channels where you can add them together. This is VERY important as it allows differential measurements. Basically, you'll hook one probe on CH1, the other probe on CH2, and then set function to ADD and INVERT CH2. This way you can measure signals which are not referenced to ground.
any 2 channel scope should be able to take a differential correct?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Austin wrote ...
EastVoltResearch wrote ...
Austin,
Any cheapo 20mhz scope will do fine for testing out any solid state tesla coil. Sure it may not have the bells and whistles as other scopes, but there are plenty of scopes on EBAY for less than $100.00 that will do the job.
The only one requirement you will want is the capabiliity for 2 channels where you can add them together. This is VERY important as it allows differential measurements. Basically, you'll hook one probe on CH1, the other probe on CH2, and then set function to ADD and INVERT CH2. This way you can measure signals which are not referenced to ground.
any 2 channel scope should be able to take a differential correct?
Not necessarily. It needs to have the ADD function and an INVERT function on one of the channels. At least if you don't want to do the math in your head.
Registered Member #1169
Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
EVR, I hit a snag while trying to properly tune the meter on the display board. After talking extensively with Wirenut I found out that he too had the same issue while trying to adjust the meter to display the correct number of LED's.
The book says to apply a variable DC voltage of 0-12 volts to the Isense terminal. while measuring the voltage on pin5 of the U41 (the Display chip). I did everything the book said however when I started turning up the voltage on my variac R21 started to smoke at 5volts. I turned everything Off and started troubleshooting the situation with wirenut.
I set my variac to exactly 12volts and hooked up the leads to the Isense terminal again and measured the voltage. It only read 3 volts. I then measured the voltage at Pin5 on U41 (referenced to ground) and only measured 2 volts.
I told Wirenut what happened and he explained that the same thing happened to him while he was testing his display board. He currently operates without it.
Do you have any suggestions? below are some photos of my voltmeter.
Registered Member #141
Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96
R21 is a 3W, 1.6 ohm resistor. Using Ohm's laws, I just did a couple quick calcs and... The formula for power is E^2 / R sooo 12V^2 = 144 / 1.6 ohms = 90 watts!!! How is that 5W resistor supposed to handle that? I must be missing something or something is wrong.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
R21 is 2.7 ohms and you may have to lift one of the legs to give the board a referance. mesure R21 to see if is still 2.7 ohms then repeat. make shure the current transformer is also disconnected
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