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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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Error in measurement with Tektronix Probe 1000:1 ??
Hello!
I tried to measure a short high Voltage peak with a little older Tektronix Probe, Part No. 010-025 on a Tektronix TDS 460 Memory-Scope. Concretely I wanted to define the ignition voltage of a fluorescent tube. I guess the voltage is about 1-2 kV (1m length of the tube). I measured between 7 and 8 kV with the Tektronix Probe (!) and disagreed with that, because the C_res on the Ballast-Board has a voltage strength of 1,6 kV and the expected voltage that I got from a gas discharge graph is about 1 kV/m. I quantified the divider of the probe with 979:1 on 50 Hz sinus AC, linear with different voltages between 100 and 400 V which I could set up on the isolating transformer. Now the question: Can somebody help to affirm this variation? Is there overshoot common because of the short voltage spike? Thanks for all consideration! greetings, Christian |
#2
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Error in measurement with Tektronix Probe 1000:1 ??
On 3ÔÂ9ÈÕ, ÏÂÎç11ʱ17·Ö, wrote:
Hello! I tried to measure a short high Voltage peak with a little older Tektronix Probe, Part No. 010-025 on a Tektronix TDS 460 Memory-Scope. Concretely I wanted to define the ignition voltage of a fluorescent tube. I guess the voltage is about 1-2 kV (1m length of the tube). I measured between 7 and 8 kV with the Tektronix Probe (!) and disagreed with that, because the C_res on the Ballast-Board has a voltage strength of 1,6 kV and the expected voltage that I got from a gas discharge graph is about 1 kV/m. I quantified the divider of the probe with 979:1 on 50 Hz sinus AC, linear with different voltages between 100 and 400 V which I could set up on the isolating transformer. Now the question: Can somebody help to affirm this variation? Is there overshoot common because of the short voltage spike? Thanks for all consideration! greetings, Christian Do you want access to China's massive pool of electronic manufacturers... but lack the time to contact suppliers, negotiate contracts, arrange shipping or monitor product quality? Don't worry - Let seriouswholesale deal with all that for you. *Check out the huge range of Gadgets, MP3 / MP4 Players, Car DVD / Audio, and Computer Accessories now by visiting the online wholesale catalog at seriouswholesale. com You'll have peace of mind thanks to the seriouswholesale Quality Control, 12-month Warranty on all products, and easy secure payment by credit card through Paypal. Selling on eBay or your own online store? Send products direct from our warehouse to your customers using our unique drop-shipping service. You can profit by selling hundreds of different products, without holding any of your own inventory! Any questions you have will be answered by the seriouswholesale English-speaking customer support team... Their aim is to make your China electronics importing business easier to run than ever before. Welcome to http://www.seriouswholesale.com. seriouswholesale - Buy from the source, profit without the hassle. - 12 Months Warranty - No minimum order restrictions - Drop-shipping with no additional fee - Pay by safely by PayPal seriouswholesale Wholesale Co., Ltd.: Chinas original and best online electronics wholesaler & drop-shipper: seriouswholesale. com |
#3
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Error in measurement with Tektronix Probe 1000:1 ??
Hi,Christian
The tube is a capacator. j. Mar 9, 10:17*am, wrote: Hello! I tried to measure a short high Voltage peak with a little older Tektronix Probe, Part No. 010-025 on a Tektronix TDS 460 Memory-Scope. Concretely I wanted to define the ignition voltage of a fluorescent tube. I guess the voltage is about 1-2 kV (1m length of the tube). I measured between 7 and 8 kV with the Tektronix Probe (!) and disagreed with that, because the C_res on the Ballast-Board has a voltage strength of 1,6 kV and the expected voltage that I got from a gas discharge graph is about 1 kV/m. I quantified the divider of the probe with 979:1 on 50 Hz sinus AC, linear with different voltages between 100 and 400 V which I could set up on the isolating transformer. Now the question: Can somebody help to affirm this variation? Is there overshoot common because of the short voltage spike? Thanks for all consideration! greetings, Christian |
#4
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Error in measurement with Tektronix Probe 1000:1 ??
On Mar 9, 10:59*am, joesmith wrote:
Hi,Christian The tube is a capacator. j. Mar 9, 10:17*am, wrote: Hello! I tried to measure a short high Voltage peak with a little older Tektronix Probe, Part No. 010-025 on a Tektronix TDS 460 Memory-Scope. Concretely I wanted to define the ignition voltage of a fluorescent tube. I guess the voltage is about 1-2 kV (1m length of the tube). I measured between 7 and 8 kV with the Tektronix Probe (!) and disagreed with that, because the C_res on the Ballast-Board has a voltage strength of 1,6 kV and the expected voltage that I got from a gas discharge graph is about 1 kV/m. I quantified the divider of the probe with 979:1 on 50 Hz sinus AC, linear with different voltages between 100 and 400 V which I could set up on the isolating transformer. Now the question: Can somebody help to affirm this variation? Is there overshoot common because of the short voltage spike? Thanks for all consideration! greetings, Christian- Hide quoted text - - Show quoted text - Is it possible that the actual voltage was that high for a short instant before the arc actually struck? I am guessing that for a 1 meter long fluorescent tube it would be no more than 2 kV at the most, if the voltage were applied in a slow steadily increasing ramp up of voltage over a period of several seconds. But, if the striking voltage was from a step-up transformer, it might be much higher for a few milliseconds until the arc was fully established. I am assuming that you used the word "quantified" in the meaning here in the USA as calibrated or checked or verified the accuracy of the probe. H. R.(Bb) Hofmann |
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Error in measurement with Tektronix Probe 1000:1 ??
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