The seller wants a $150 for it and it comes with two generic probes. Do you see anything out of the ordinary or do you think it's a good buy for a beginner.
Pics of the scope:
Photo Album - Imgur
This was the sellers description:
Images are attached. Channel 1 is on top, and channel 2 is below. The first three images show a 5 MHz square wave from a function generator. The next images show the probes connected to the square wave calibration signal from the scope.
The included probes are 1X/10X switchable, with 100 MHz bandwidth on the 10X setting. They include the "hat" clips that fit on top of the probe. They are no-name probes, but they seem to perform well.
I also have included a picture of a Tektronix P6133 10X probe rated to 150 MHz ($20 if you're interested). The Tek probe does not include the hat.
I have a brand new Tektronix P6101 1X probe (not pictured) as well. It has 15 MHz bandwidth (1X probes are all much more limited in bandwidth than 10X). It includes the "hat." It would be $50 if you're interested.
Pics of the scope:
Photo Album - Imgur
This was the sellers description:
Images are attached. Channel 1 is on top, and channel 2 is below. The first three images show a 5 MHz square wave from a function generator. The next images show the probes connected to the square wave calibration signal from the scope.
The included probes are 1X/10X switchable, with 100 MHz bandwidth on the 10X setting. They include the "hat" clips that fit on top of the probe. They are no-name probes, but they seem to perform well.
I also have included a picture of a Tektronix P6133 10X probe rated to 150 MHz ($20 if you're interested). The Tek probe does not include the hat.
I have a brand new Tektronix P6101 1X probe (not pictured) as well. It has 15 MHz bandwidth (1X probes are all much more limited in bandwidth than 10X). It includes the "hat." It would be $50 if you're interested.
Buck fifty is pretty good for a 100MHz scope even if you may have to get it re-calibrated. It doesn't look like you may have to though. I spent ~$400 for a 40MHz scope, retail, brand new. Although you may not need all that bandwidth for audio, it would come in handy for RF projects.🙂
If I had $150 I 'd get it!
Mine is only a 40mhz but it does have an on screen measuring system.
jer
Mine is only a 40mhz but it does have an on screen measuring system.
jer
Assuming that the scope is as described, that's a fair value. Tektronix scopes are among the best available. This scope was about $1500 when new, if memory serves.
That 2235M is a very nice little scope. I refurbished and sold a few of those, along with lots of other Tek scopes. That was one of my favorite models. They are a pleasure to use. (The 2465 series were the only portables that seemed MUCH better, i.e. to be worth spending a lot more on, to me.)
Looks like the probe compensation screws need to be adjusted, or possibly those probes do not have the compensation range needed for the scope's inputs.
If I recall correctly, the military version had one or two features that were better than the standard 2235, and also had better EMI/RFI shielding.
The only somewhat-common problem with that scope that I remember was that the power supply sometimes went tits up. But they are very easy to work on and there is a a fair amount of information about them in the TekScopes group at yahoogroups.com, and in the sci.electronics.repair group at Google Groups. You should also acquire the service manual (as for every piece of equipment one owns). [I collected most of that power supply repair information in a text file, so email me if you get the scope, so you can keep it on hand. I also have a calibration manual and parts list for it that you can have.]
Note that if there is a large three-pin white Molex connector in the power supply then it should be removed and the wires soldered directly to the power supply section.
In case you ever need another CRT, that scope uses the same CRT as these other models: 2213A, 2215A, 2220, 2230, 2236. I think they mostly had the same power supply sections, too, or at least the 2213A, 2215A, 2230, and 2235 did.
Looks like the probe compensation screws need to be adjusted, or possibly those probes do not have the compensation range needed for the scope's inputs.
If I recall correctly, the military version had one or two features that were better than the standard 2235, and also had better EMI/RFI shielding.
The only somewhat-common problem with that scope that I remember was that the power supply sometimes went tits up. But they are very easy to work on and there is a a fair amount of information about them in the TekScopes group at yahoogroups.com, and in the sci.electronics.repair group at Google Groups. You should also acquire the service manual (as for every piece of equipment one owns). [I collected most of that power supply repair information in a text file, so email me if you get the scope, so you can keep it on hand. I also have a calibration manual and parts list for it that you can have.]
Note that if there is a large three-pin white Molex connector in the power supply then it should be removed and the wires soldered directly to the power supply section.
In case you ever need another CRT, that scope uses the same CRT as these other models: 2213A, 2215A, 2220, 2230, 2236. I think they mostly had the same power supply sections, too, or at least the 2213A, 2215A, 2230, and 2235 did.
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I've got a 2225, which appears to be the little brother to the 2235, working at an upper limit of 50Mghz vs 100 for the 35. I love the 2225, it's a joy to use, if the 35 is anything like it (which it appears to be from the photographs) then I'd say you're onto a winner.
One thing I was told to look/ask for are pictures of the scope doing its thing in a decently lit room, sometimes the tubes can be on their way out and a picture taken in a darkened room helps to hide this. The images you linked to show the 35 in question working to an adequate level I'd say.
One thing I was told to look/ask for are pictures of the scope doing its thing in a decently lit room, sometimes the tubes can be on their way out and a picture taken in a darkened room helps to hide this. The images you linked to show the 35 in question working to an adequate level I'd say.
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