Hitachi V-1065A Scope Problems...

[Kiriakos GR]

Re: Hitachi V-1065A Scope Problems...

Tom this scope does not support an 100X probe.
It has fixed input multiplier X1 / X10.


http://imagine41.com/media/catalog/p...65_010_2_1.jpg

[tom66]

Re: Hitachi V-1065A Scope Problems...

Doesn't matter. You just mentally multiply the scale by 100X. You could use a 1000X probe too -- though it may be hard to see due to the low output of the probe. 99% of circuits are satisfied by 1X and 10X switchable probes, but the odd higher voltage or higher speed one requires a 100X.

[Kiriakos GR]

Re: Hitachi V-1065A Scope Problems...

Either way he can not use this probe, nor mentally multiply the scale, this scope is not even tested or calibrated so to calculate anything on that screen.

[tom66]

Re: Hitachi V-1065A Scope Problems...

Bullshit... sorry. There is NO calibration. The scope is only ever calibrated for 1X scale but the calibration error will exist only in the probe, there is nothing you can do to adjust scope for 10X and 100X (except maybe 10X multiplier gain, but that is a convenience feature and rarely intended to be as accurate as the main scale.) Probe is intended as non-adjustable except for capacitance which is matched in same way as 10X probe. And do you really think you that the OP requires absolute accuracy? Most oscilloscope applications would be fine with ±10% error in each axis!

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

Tom this scope does not support an 100X probe.
It has fixed input multiplier X1 / X10.


http://imagine41.com/media/catalog/p...65_010_2_1.jpg

Sorry for this question, don't mean to upset you or anything, but why does my scope not support a X100 probe? I bought one and calibrated it all right. I don't understand what a fixed input multiplier X1 / X10 mean. It's a Hitachi V-1065A (with inputs for two probes)

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

Bullshit... sorry. There is NO calibration. The scope is only ever calibrated for 1X scale but the calibration error will exist only in the probe, there is nothing you can do to adjust scope for 10X and 100X (except maybe 10X multiplier gain, but that is a convenience feature and rarely intended to be as accurate as the main scale.) Probe is intended as non-adjustable except for capacitance which is matched in same way as 10X probe. And do you really think you that the OP requires absolute accuracy? Most oscilloscope applications would be fine with ±10% error in each axis!

With my abilities and the first time I've ever used a scope, right now, not even really worried about absolute accuracy. Just figuring out how to use it and actually being able to use it to fix something (like this guitar pedal I got here), I think that'd be amazing. The scope's service manual does have procedures to calibrate the probe by opening it up and adjusting stuff. I do not have the equipment listed to do that though and if anything, I'd pay someone to calibrate it. I think it does need to be calibrated though. I read some wheres that it wasn't worth paying for if you're just a work at home hobbyist. I don't know if that's what you guys are talking about though. You guys are definitely at a different level than I am and I truly appreciate all the help and everything. Thank you.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

I have three seperate probes, 2 X1/X10 and 1 X100. When I have them hooked up, to get the display all the same size, the X1 is set to .5V VOLTS/DIV, the X10 needs to be set at 50mV and the X100 has to be set at 5mV. Does that mean that the scope does support the X100 probe?

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

Can I hook my probe up to a 9V battery? Should I see anything if I do?

[tom66]

Re: Hitachi V-1065A Scope Problems...

You can. At 2V/div with the trace centered, it should be near the top at 4.5divs from center, assuming you use a 1X probe and you've centered it so with no signal input a flat line appears in the middle of the screen.

All a 10X/100X probe does is reduce the input by 10X/100X respectively, whilst also reducing the capacitive and resistive load by 10X/100X, which can be useful for high speed circuits, though probably not important to yourself. All you have to do to get an accurate amplitude scale is mentally multiply the input by 10X/100X, but you can if you wish use the 10X multiplier for the 10X mode. Note that the 10X mode often has reduced bandwidth (e.g. 10MHz maximum) - check the manual to see if it does - hence why it is only used in certain situations.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

You can. At 2V/div with the trace centered, it should be near the top at 4.5divs from center, assuming you use a 1X probe and you've centered it so with no signal input a flat line appears in the middle of the screen.

All a 10X/100X probe does is reduce the input by 10X/100X respectively, whilst also reducing the capacitive and resistive load by 10X/100X, which can be useful for high speed circuits, though probably not important to yourself. All you have to do to get an accurate amplitude scale is mentally multiply the input by 10X/100X, but you can if you wish use the 10X multiplier for the 10X mode. Note that the 10X mode often has reduced bandwidth (e.g. 10MHz maximum) - check the manual to see if it does - hence why it is only used in certain situations.

Thank you. I created a small circuit with a resistor, capacitor, LED and then a diode. The electricity flows first through the resistor, then the capacitor, then the LED and then finally the diode. I thought if I hooked my scope up to the cap, I'd be able to see it fire. I could not though. It looked the same either way. When I messed with the TIME/DIV setting, I could slow down the wave and see ridges and everything, like a wave scrunched together. With or without the cap, it looked the same. Not really what I was expecting to see...Also, I'm pretty sick now but I'm still playing with it on and off. If there's a delay between messages, it just means I'm trying to sleep or laying down.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

...I created a small circuit with a resistor, capacitor, LED and then a diode...I thought if I hooked my scope up to the cap, I'd be able to see it fire. I could not though...

Sorry, I didn't realize how capacitors worked and I did have my components placed incorrectly into the bread board. It turns out capacitors generally block DC and only allow AC to flow through. I could, I guess, hook it up so when the power is supplied, it'll charge the cap and power the LED until power is removed and then the LED will discharge and power the LED for a bit. That's not what I wanted though. I just wanted to see them fire. Someone told me that capacitors can act like a clock pulse.

[Kiriakos GR]

Re: Hitachi V-1065A Scope Problems...

Spork send this bucket to the trash can, and buy a modern one.
No matter how stupidly Tom behaves, the bottom line is just one.
This scope is not for you, is for some old guys who were dealing with analogue signals which accuracy was never important.
If Tom loves it that much sale it to him.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

Spork send this bucket to the trash can, and buy a modern one.
No matter how stupidly Tom behaves, the bottom line is just one.
This scope is not for you, is for some old guys who were dealing with analogue signals which accuracy was never important.
If Tom loves it that much sale it to him.

So you believe that it wouldn't do me any good? I've never used one and I thought it was a good one for TVs. I read about it on another forum. If I were to get a more recent one, which one would you suggest? What would be the pros to using a newer one vs this one? For example, what can this one not do that a newer one can? Thanks.

[tom66]

Re: Hitachi V-1065A Scope Problems...

He is just talking absolute nonsense. He was previously banned from eevblog forum for some arrogant arguments with other members, so I would take anything he says with a pinch of salt.

I have a Rigol DS1102E, a fantastic scope but I'm sure WELL past your budget at £300 or around $500. This scope is fine for a beginner. In fact an analog scope is great to learn on. There's no "auto setup" button to press on an analog scope, like on a digital scope. Repeatedly using auto setup means you don't learn anything.

A newer digital scope can:
- freeze the waveform
- automatically set parameters to the right values with one button press
- make measurements on the signal (a few analog scopes can do this too) e.g. volts peak to peak
- save waveform to memory stick
- print out a waveform

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

...A newer digital scope can:
- freeze the waveform
- automatically set parameters to the right values with one button press
- make measurements on the signal (a few analog scopes can do this too) e.g. volts peak to peak
- save waveform to memory stick
- print out a waveform

If that's all, I think this one would be better for me. I need to learn this stuff and this sounds like a good model to learn on. Thanks.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

If that's all, I think this one would be better for me. I need to learn this stuff and this sounds like a good model to learn on. Thanks.

I modified my lit up LED circuit to include a 555 timer. Now it turns on and off. I'm having trouble seeing the wave form though. If I turn the TIME/DIV all the way down, I can see the dot moving up and down but I want to see the wave form whole...when I increase the TIME/DIV, the whole line moves up or down, it's not like the square wave that's on the oscilloscope. What am I doing wrong?

[RON_CET]

Re: Hitachi V-1065A Scope Problems...

See attached this should be what your trying to see and do.The speed at which the LED is turned on and off is set by the values of Ra and Rb.Pin 2 at capacitor showing you charge and discharge rate

[tom66]

Re: Hitachi V-1065A Scope Problems...

I modified my lit up LED circuit to include a 555 timer. Now it turns on and off. I'm having trouble seeing the wave form though. If I turn the TIME/DIV all the way down, I can see the dot moving up and down but I want to see the wave form whole...when I increase the TIME/DIV, the whole line moves up or down, it's not like the square wave that's on the oscilloscope. What am I doing wrong?

You need to decrease the size of the timing capacitor to get a faster wave, as you're just seeing the electron beam following it.

[Kiriakos GR]

Re: Hitachi V-1065A Scope Problems...

So you believe that it wouldn't do me any good? I've never used one and I thought it was a good one for TVs. I read about it on another forum. If I were to get a more recent one, which one would you suggest? What would be the pros to using a newer one vs this one? For example, what can this one not do that a newer one can? Thanks.

If your plan is to keep working in this field for the next 5 years, you should get a modern one.
The only problem for a 100MHz scope but fast, it is always the retail price, all the called worthy ones are up to 1000 Euro.
I do have a very fresh GDS-2102A and currently I am researching for a good quality 100X probe.

In simple English you started this topic at the same time that my own research is on the go.

The digital scope it can help you to see much detail on screen and measure almost accurately the voltage.
With such a measurement at hand you will be able to compare it with the specified in the service manual.
Simple as that.

[Spork Schivago]

Re: Hitachi V-1065A Scope Problems...

Thanks guys! I will try that. I think I'm figuring this stuff out, slowly but surely.

Now someone said that my probe doesn't support the X100 probe. Is that true? I measured the 555 timer using the X1, X10 and X100 probe. To get the oscilloscope to show up the same with each probe, I had to change the VOLTS/DIV setting. Essentially, the 1X probe with VOLTS/DIV set to 5V shows the same results as the X10 set to 0.5V and the X100 set to 50mV.