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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » will is Oscilloscope work (Page 1)

 
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Author Topic: will is Oscilloscope work
Jeremy M Smith
Film Handler

Posts: 48
From: Taupo New Zealand
Registered: Aug 2008


 - posted 08-10-2008 03:58 AM      Profile for Jeremy M Smith   Email Jeremy M Smith   Send New Private Message       Edit/Delete Post 
I am look at this http://cgi.ebay.com/Hameg-HM303-6-35MHz-Dual-Chan nel-Trace-Oscilloscope-H9_W0QQitemZ200244666475QQcmdZViewItem?hash=item200244666475&_trkparms=39%3A1%7C66%3A2%7C65%3A15&_trksid=p3286.c0.m14.l1318

so I can do my own a-chain allignment would this work or do i need a 100mhz one

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John Wilson
Film God

Posts: 5435
From: Sydney, Australia.
Registered: Dec 1999


 - posted 08-10-2008 04:09 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
You know that's in New York, right? They are heavy buggers so go see the bank right now for the loan to pay for the shipping.

No offence Jeremy, but if you have to ask if it will do the job, do you really think you should be messing around with the sensitive adjustments on your machinery?

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Jeremy M Smith
Film Handler

Posts: 48
From: Taupo New Zealand
Registered: Aug 2008


 - posted 08-10-2008 04:30 AM      Profile for Jeremy M Smith   Email Jeremy M Smith   Send New Private Message       Edit/Delete Post 
No offence taken I have had people show me what i need to do. my boss just doesn't want to fork out $1000nz for a Oscilloscope. thanks for your concern. It is a really hard time for the movie industry of here in NZ not sure if it is the same over there so I am trying to save money anywhere I can.

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Randy Stankey
Film God

Posts: 6382
From: Erie, Pennsylvania
Registered: Jun 99


 - posted 08-10-2008 09:19 AM      Profile for Randy Stankey   Email Randy Stankey   Send New Private Message       Edit/Delete Post 
1) It will work. 20 MHz would be enough.

2) If you decide to do your own work, be DAMN SURE you study everything you possibly can BEFORE you start fooling around.
Most bosses will be happy if you can fix the projectors and make them better but they will be VERY unhappy if you fuck things up!
If you have the process 100% fixed in your mind and you are certain you can do the job correctly and you can do it correctly the first time, go ahead and do it. But, if there is any possibility that you could fuck things up, don't even try.

3) It will cost you at least $75.00 US to ship to Australia. Add that do the $15.00 it already costs to win the auction and you're at $90.00 already. I wouldn't be surprised if your total cost is $150.00 or better once you get the thing shipped and insured.

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John Wilson
Film God

Posts: 5435
From: Sydney, Australia.
Registered: Dec 1999


 - posted 08-10-2008 10:24 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
quote: Randy Stankey
It will cost you at least $75.00 US to ship to Australia.
And then probably a bit more to get it to New Zealand. [Wink]

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16005
From: Bountiful, Utah
Registered: Jun 99


 - posted 08-10-2008 10:25 AM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
quote: Randy Stankey
1) It will work. 20 MHz would be enough.


Dolby actually recommends a 60mhz for working with SRD. Don't you guys have E-Bay over Australia? Shipping would be far less than from NY. Thats also not a very decent grade of scope and should you pay for one to be shipped over from that distance I suggest spending a few hundred US dollars to get a decent used Tektronix 4XX series scope. The 465B is built like a tank and lasts forever. Min's been battering around in the back of the service van for going on 10 years now. I also have the roll around cart and I use it in maintainance in big plex's where I have to knock out alot of A-Chains in just a few hours time. Both scope and analyzer are set up on the cart and I just go at it. Don't forget you'll need some sort of 1/3 octave audio spectrum analyzer as well...
Ebay Tektronix 465B Shopping Link

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John Wilson
Film God

Posts: 5435
From: Sydney, Australia.
Registered: Dec 1999


 - posted 08-10-2008 10:34 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
quote: Mark Gulbrandsen
Don't you guys have E-Bay over Australia?
Yes we do.

They even have a New Zealand version of eBay which (as you'll see by his profile) is where Jeremy is. [Razz] (We Aussies like to be confused with New Zealand about as much as someone from the USA likes to be confused with a Canadian or vice versa.)

Chances of finding one on either .au or .nz are pretty slim I'd imagine. Better to look at absorbing the potential cost of $150 and buy something locally...even if it's new. [Razz]

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Louis Bornwasser
Film God

Posts: 4417
From: prospect ky usa
Registered: Mar 2005


 - posted 08-10-2008 08:46 PM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
Mark is right on this one. We have found that the higher numbers (60Mhz 100Mhz) also give a brighter picture; very important if you are old and eyesight isn't what it once was. Louis

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 11913
From: Annapolis, MD
Registered: Dec 1999


 - posted 08-10-2008 09:21 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
I have set up many a DD reader with a 20MHz scope. Since one is doing a relative measurement...kinda like focusing an image, you can tell when it is best.

That said, everything is much more crystal clear with a 100MHz scope...which I now use in the field as well as the shop.

Steve

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Jeremy M Smith
Film Handler

Posts: 48
From: Taupo New Zealand
Registered: Aug 2008


 - posted 08-11-2008 06:25 AM      Profile for Jeremy M Smith   Email Jeremy M Smith   Send New Private Message       Edit/Delete Post 
"1/3 octave audio spectrum analyzer"

this is only for b chain right?

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James Falloon
Film Handler

Posts: 71
From: Wigram, Christchurch, New Zealand
Registered: Oct 2003


 - posted 08-11-2008 06:36 AM      Profile for James Falloon   Email James Falloon   Send New Private Message       Edit/Delete Post 
Hi Jeremy

There are a few on trade me (New Zealands own version of eBay) keep an eye out on there, it's easier to get one already here than importing one, also don't forget you may have to pay GST on it as well if you are bringing it into the country.

Also listen to Randy, it's not what you know but what you don't know that will land you in hot water.

Getting the sound fixed is your bosses problem, if he doesn't want to fork out to fix it well it's not your problem, crappy sound it shall be. (side note: I believe its attitudes like that that  got the industry into the pickle that it's in). will you be getting paid extra to use your gear to fix your bosses sound? what if something unforeseen does go horribly wrong? then what?

I don't take my scope into work, I leave allignments up to the professionals, who have all the proper tools and experience and know what they're doing, and my hands are clean if it does all turn to crap.

I know it sucks, I too care about presentation but it's just not worth me taking the risk, a noble gesture none the less.

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Kenneth Wuepper
Jedi Master Film Handler

Posts: 980
From: Saginaw, MI, USA
Registered: Feb 2002


 - posted 08-11-2008 08:45 AM      Profile for Kenneth Wuepper   Email Kenneth Wuepper   Send New Private Message       Edit/Delete Post 
Jeremy,

The spectrum analyzer is also used for proper "A" chain alignment. It is possible to see the high frequency response on the analyzer and the phase relationship of the channels on the oscilloscope. Those tools and the proper film loops are essential for proper and complete alignment of the "A" chain.

The "B" chain is the fitting of the sound into the auditorium and provides the opportunity to make some correction for the acoustics. The best solution to acoustics is to correct the room and do as little to the system equalization as possible.

There is no magical approach to booth maintenance but observation of professionals and studying the manufacturer's manuals is how you will learn. Experimentation on operating equipment owned by someone else is very risky. You have everything to lose and little to gain by experimenting with other people's equipment.

KEN [Wink]

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Jeremy M Smith
Film Handler

Posts: 48
From: Taupo New Zealand
Registered: Aug 2008


 - posted 08-12-2008 08:55 AM      Profile for Jeremy M Smith   Email Jeremy M Smith   Send New Private Message       Edit/Delete Post 
thanks for all the comments it has given me a lot to think about. I have many things to fix at the moment but I will look into this in the near future. Our cinema is falling apart at the moment. so many things the place hasn't had maintenance on the only thing that has is the sound. thanks to technicians that when thing do go bung I can call on. Just need to try and get the booth flowing again.

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Gordon McLeod
Film God

Posts: 9426
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 08-12-2008 04:43 PM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
Has anyone tried this item
http://www.ezembedded.com/product_info.php?products_id=35

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16005
From: Bountiful, Utah
Registered: Jun 99


 - posted 08-12-2008 06:41 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
Gord,

Thats an interesting scope add on for a laptop and it actually has useful bandwidth... I have to wonder though if the USB connection is actually capable of that bandwidth or not.

Mark

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