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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Tek 2236 Scope: Counter/Timer/Multimeter (CTM) Problem
I've got a problem with the Counter/Timer/Multimeter (CTM) function
of a Tektronix 2236 oscilloscope. The CTM is not operating correctly when I try to measure the voltage on channel 1. When I try to measure the DC voltage of channel 1 (DC Coupling), the fluorescent display reads "DC OUCH" indicating an overvoltage EVEN when NO voltage is being applied. When I try to measure the AC voltage of channel 1 (AC Coupling) the fluorescent display reads "AC 0.0013" (or somewhere around there) regardless of what voltage is applied to channel 1. The CTM measures voltage correctly when I use the multimeter connector inputs on the right side of the oscilloscope. Therefore, it appears that CTM is basically functioning, but there is some sort of problem in the coupling of the channel 1 signal into the CTM. Anybody familiar with this problem? Thanks, Michael |
#2
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Are you shure it is not a problem of setting up and using the scope?
May be a look in the operating manual might help to set things right. You can download one for free from www.teknetelectronics.com hth, Andreas |
#3
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Not connecting anything to channel 1, doesn't mean voltage = 0V, it is
"in the air" so, any voltage may be there. Try shortcircuiting the channel, and see if the same problem appears... |
#4
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Yes, I have the manual and I'm sure the scope is configured correctly
to read voltage off of channel 1. Thanks, Michael In article .com, says... Are you shure it is not a problem of setting up and using the scope? May be a look in the operating manual might help to set things right. You can download one for free from www.teknetelectronics.com hth, Andreas |
#5
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I've tried doing this with a 1 KHz 3vpp signal (AC coupling), a 1.5v
alkaline battery (DC coupling), and an open circuit (AC and DC couplines). The behavior is the same in all three cases. I will try short-circuiting the probe to see if the behavior changes. Thanks, Michael In article , says... Not connecting anything to channel 1, doesn't mean voltage = 0V, it is "in the air" so, any voltage may be there. Try shortcircuiting the channel, and see if the same problem appears... |
#6
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"Michael J. Linden, N9BDF" wrote in
: Yes, I have the manual and I'm sure the scope is configured correctly to read voltage off of channel 1. The proper way to proceed is to look at the schematics and circuit description in your service manual,and check the voltage/signal that's picked off from the Ch.1 vertical and applied to the DMM input. -- Jim Yanik jyanik at kua.net |
#7
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OK, guys, I found the problem. The cable that routes the channel 1 signal
from the "attenuator box" had disconnected itself. It looks like the weight of the attached toroid was probably responsible. Thanks, Michael In article , . says... "Michael J. Linden, N9BDF" wrote in : Yes, I have the manual and I'm sure the scope is configured correctly to read voltage off of channel 1. The proper way to proceed is to look at the schematics and circuit description in your service manual,and check the voltage/signal that's picked off from the Ch.1 vertical and applied to the DMM input. -- Jim Yanik jyanik at kua.net |
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