Very interesting 'scoping results

Started by Anonymous in sci.electronics.basics5 years ago 10 replies

At least interesting to me. On the advice from members of this newsgroup I bought a 465B TEK oscilloscope. It comes in handy now and then....

At least interesting to me. On the advice from members of this newsgroup I bought a 465B TEK oscilloscope. It comes in handy now and then. Yesterday I had to replace a power supply in one of my CNC machines. The only one available in a reasonable length of time was a used one of unknown quality. I spoke to a friend of mine and he said to 'scope the thing and look for any ripple on the DC out...


Advice please about which frequency generator to buy

Started by Anonymous in sci.electronics.basics3 years ago 8 replies

To All, Several years ago I was looking here for advice about buying an oscilloscope. The unit that got the most votes for my price range...

To All, Several years ago I was looking here for advice about buying an oscilloscope. The unit that got the most votes for my price range and experience was the Tek 465B. So I bought one and then later someone who used to post here sent me the meter kit that Tek used to sell and I installed it on the 'scope. The 'scope is way more than I need and so it has never let me down. Now I think I co...


Anybody familiar with this 'scope?

Started by Anonymous in sci.electronics.basics4 years ago 3 replies

Greetings Everybody, My son brought by today an old oscilloscope. The Brand is Lambda and the model is MM-2. On the back are three pairs of...

Greetings Everybody, My son brought by today an old oscilloscope. The Brand is Lambda and the model is MM-2. On the back are three pairs of terminals. One is marked with G & V, one G & H, and the last pair R & S. So the first two pairs are pretty obvious, horizontal and vertical, but I don't have any idea what the last pair is for. The screen is about 2 inches in diameter, and is marked with...


Unexpected PIC32 behavior

Started by Randy Day in sci.electronics.basics5 years ago 12 replies

I'm trying out the SPI module on a PIC32MX150, and I've encountered something I wasn't expecting. The pin selection / module enabling stuff...

I'm trying out the SPI module on a PIC32MX150, and I've encountered something I wasn't expecting. The pin selection / module enabling stuff is done, and I get i/o, but the Slave Select pin only goes 0-1.2v, rather than 0-3.3v like the clock and data pins. I tried a 10k pullup resistor, it stayed at 0-1.2. Nothing is attached to the pins except the oscilloscope. I've hooked up two...


Rudimentary PC USB oscilloscope?

Started by John Doe in sci.electronics.basics3 years ago 20 replies

My main question is about PC USB-based oscilloscopes. The rest of this is specific to my problem(s) and may be overlooked. I'm using cordless...

My main question is about PC USB-based oscilloscopes. The rest of this is specific to my problem(s) and may be overlooked. I'm using cordless drills to power electric bicycles. I have one built. It works but is underpowered. I am building a better one using a DeWalt DCD995. Some nice electronics included in that drill, a stout (very tight turning) brushless motor with a controller. ...


FM deviation measurement

Started by Steve in sci.electronics.basics11 years ago 3 replies

Could someone please describe to me the calculation behind FM deviation measurement using an oscilloscope? I've made the measurement thousands...

Could someone please describe to me the calculation behind FM deviation measurement using an oscilloscope? I've made the measurement thousands of times, but I've just followed the manual. The measurement I make is 30Hz FM with 480Hz deviation on 9960Hz carrier (VOR signal). Following the procedure, iirc, set main timebase to 10us/div, measure deviation at 6th rising edge, should be 48.5u...


Modern digital oscilloscopes question

Started by eatmorepies in sci.electronics.basics7 years ago 38 replies

Hello I worked in a place that gave me access to budget, non memory 20MHz CRT scopes - I no longer work there. They were perfect for my...

Hello I worked in a place that gave me access to budget, non memory 20MHz CRT scopes - I no longer work there. They were perfect for my needs. Six years on and I find I need an oscilloscope, the market seems to have changed. Are those cheap digital models any good? I need reasonable Y sensitivity (5mV/div), up to 5MHz, storage would be nice, it's not for radio work. I found things l...


Input Voltage drops when use 7806

Started by yanto in sci.electronics.basics12 years ago 6 replies

Hi, I have created simple oscilloscope circuit taken from magazine, when I use 6V battery (4 pcs AA type), the input voltage is 6V, but when I...

Hi, I have created simple oscilloscope circuit taken from magazine, when I use 6V battery (4 pcs AA type), the input voltage is 6V, but when I am using regulator circuit 7806, the input voltage will drop. Why this happen?, my electrics basic is not so good, sorry. TIA Yanto


Why when we touch osciloscope probe it shows 50Hz noise?

Started by op27 in sci.electronics.basics9 years ago 12 replies

Hello, I have asked this question from different people but never got a satisfactory answer. I want to know in terms of electromagnetic physics...

Hello, I have asked this question from different people but never got a satisfactory answer. I want to know in terms of electromagnetic physics how 50 Hz frequency of main is induced in our body and converted to voltage at oscilloscope probe. Please answer only if you deeply understand this phenomenon. dose it depend on current? i.e. if we get more currents from main it induces more noise...


Fixing Heathkit Oscilloscope

Started by Ivan Vegvary in sci.electronics.basics6 years ago 18 replies

Picked up the above for $ 10. Fuse was blown. Don't have a 125V 1A fuse b= ut used 125V 1/2 amp fuse instead. Front indicator light went on...

Picked up the above for $ 10. Fuse was blown. Don't have a 125V 1A fuse b= ut used 125V 1/2 amp fuse instead. Front indicator light went on and 30 se= conds later the 1/2 amp fuse blew. Will pic up a 1 amp fuse. If it keeps = blowing, where would be a good place - method - to start diagnosis? I did = get a manual and schematic with the scope. I realize that I could probably buy an equ...


Filtering generator output?

Started by Anonymous in sci.electronics.basics4 years ago 7 replies

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine...

I have a 4500 watt generator that is for emergency use. When it was new I checked the output with an oscilloscope just to see how pure the sine wave was and how close to 60 Hz it was. Well, the main sine wave looked good and the frequency was very close to 60 Hz. It floated around a little as the load changed but then would stabilize very close to 60Hz. However, there were lots of other small...


50 ohm load

Started by Anonymous in sci.electronics.basics11 years ago 27 replies

I'm studying op-amp circuit combined with rf mixer. While I was reading articles on the circuit,I found that the term like "50 ohm load" or "50...

I'm studying op-amp circuit combined with rf mixer. While I was reading articles on the circuit,I found that the term like "50 ohm load" or "50 ohm ( )" occurs frequently. I also remember that one of the input options of Digital oscilloscope was 50 ohm load. Because I'm a newcomer to analog electronics, I don't know significance of that term. Why should we think about the specific ...


Differential Probe

Started by melissa walraven in sci.electronics.basics7 years ago 18 replies

Hi , I need to measure 800 volts peak to peak. I am using the following scope with 300 V RMS spec. mentioned at the front of the...

Hi , I need to measure 800 volts peak to peak. I am using the following scope with 300 V RMS spec. mentioned at the front of the oscilloscope. Scop Link: http://www.tequipment.net/RigolDS1102D.html I found the following differential probe to do this http://www.testequity.com/products/573/ My question is that am I going in the right direction with this. Will the high voltage...


Oscilloscope question

Started by Anonymous in sci.electronics.basics5 years ago 15 replies

I have a TEK 465B 'scope. There are 8 divisions on the vertical axis of the graticule. When using a 10x probe does this mean that trhe 'scope...

I have a TEK 465B 'scope. There are 8 divisions on the vertical axis of the graticule. When using a 10x probe does this mean that trhe 'scope can measure a 400 volt signal? What if the signal is 500 volts? will this damage the 'scope? What if the probe I'm using is 1x, 10x, switchable probe and it is set to 1x? Will this damage the 'scope? When measuring voltages higher than 24 volts I do tak...


Piezo ignitor pulse shape

Started by Arnold in sci.electronics.basics10 years ago 13 replies

1) I am wondering whether the piezo ignitor of a BBQ lighter generates a single spark or multiple sparks. 2) In other words, I would like to...

1) I am wondering whether the piezo ignitor of a BBQ lighter generates a single spark or multiple sparks. 2) In other words, I would like to know the pulse shape of the piezo ignitor, but I haven't got an oscilloscope. Is it AC or DC, is it a single monopolar pulse, or a bipolar pulse, or a dampened oscillation? Probably the pulse shape depends on its design, so I dissected a piezo igni...


Bridge Rectifier Problem.......!!!!!!!

Started by jo.jo in sci.electronics.basics12 years ago 21 replies

I am trying to construct a small desktop power supply and have noticed a small problem when measuring the output voltage from my...

I am trying to construct a small desktop power supply and have noticed a small problem when measuring the output voltage from my bridge rectifier. The rectifier is constructed from four 1N4001. When i apply a AC wave (sin) to the input and measure the output, using a oscilloscope, the bridge rectifier seems to produce only halfwave rectification. I was expecting full wave rectification. ...