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February 11th, 2006, 11:51 AM
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#1 |
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Major Player
Join Date: Sep 2005
Location: Pleasanton, CA
Posts: 258
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Connections and Power
What is the list of connections that can be safely connected/disconnected with power on? Which ones require power off?
Best, Christopher |
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February 11th, 2006, 08:58 PM
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#2 |
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Inner Circle
Join Date: Dec 2002
Location: Augusta Georgia
Posts: 5,421
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Always power off the camera when changing lenses!
I personally recommend powering off the camera when connecting/disconnecting the viewfinder. I have not read this anywhere, I just think it is a good idea. In my opinion, you should not have to power the camera off to connect any audio in or out, video in or out, or genlock, or HD-SDI. Canon service has, according to one post on this site, told a Canon user to power off when connecting the Firewire. Personally, I do not think this is necessary. To sum this up, if the connection involves power in any way, such as the lens, or the viewfinder, power off the camera.
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Dan Keaton Augusta Georgia |
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February 12th, 2006, 12:15 PM
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#3 | |||
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Major Player
Join Date: Sep 2005
Location: Pleasanton, CA
Posts: 258
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Quote:
Quote:
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That said, I'm being extra cautious while soliciting advice from others. Best, Christopher |
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February 12th, 2006, 12:29 PM
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#4 |
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Major Player
Join Date: Jun 2004
Location: McLean, VA United States
Posts: 749
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While I absolutely and enthusiastically endorse powering down when removing the lens I have gotten away with not doing it more than once on the XL-H1. I guess I've been lucky.
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February 12th, 2006, 12:46 PM
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#5 |
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Major Player
Join Date: Sep 2005
Location: Pleasanton, CA
Posts: 258
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found this in the manual
Page 65 ... "To supply a microphone with phantom power, set the +48V switch to ON. Make sure to connect the microphone first, before turning on the phantom power. Keep the microphone connected when turning off the phantom power."
I plan to observe this rule just to be safe. Are Canon being overly conservative here, or has anyone actually experienced damage when connecting XLR with the phantom power on? Best, Christopher |
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February 13th, 2006, 02:48 AM
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#6 | |
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Major Player
Join Date: Nov 2005
Location: Vittsjö, SKÅNE, SWEDEN
Posts: 266
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Quote:
The problem is usually if the connected equipment has integrated circuits and other active solid state components inside. Generally, they will run outside of their specifications if their inputs are forced above or below its power supply. So, the power supply should be connected first. When you have a multi pole connector you never know which connection is applied first. It could depend on how you push the connector in, straight or a littled angled to any side. So much safer to have the power off while you connect it. Careful electronic or mechanical design can solve this problem and that is, as far as I know, done for the Firewire and USB systems so they could be connected and disconnected wildly. Another thing is that you never know how software is programmed. Some software will read the settings only when the unit starts up. Other will constantly check what is going on and accept changes after the boot is done. I would definitely not exchange the viewfinder without turning off the camera. The lens I don't know. It is easy to forget to turn the camera off when you are busy on a shot. I think it should be designed to not destroy itself but here we have to ask Canon. An ordinary audio connector is no big problem because it does not involve power if it is not phantom powered. However, you can blow a speaker if the volume is high on an amplifier ... I do not recommend to apply phantom powered microphones with the power on. The 48V power supply is a huge signal compared to the tiny sound signal. Connecting such signals with power on is similar to drive in your car and put in reverse gear while rolling forward; It might take that abuse once or tvice but that doesn't say it is a good practise. I'm sorry if this information was not just for an H1 but more general. /Johan Last edited by Johan Forssblad; February 14th, 2006 at 01:30 AM. |
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February 13th, 2006, 03:55 PM
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#7 |
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Major Player
Join Date: Dec 2004
Location: Raleigh, NC
Posts: 540
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Hope I'm not hexing myself here, but I connect & disconnect mics ALL the time with phantom power on and never have a problem. In the heat of a shoot, it's hard to remember to flip the switch...I rarely do.
KW |
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February 13th, 2006, 04:04 PM
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#8 |
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Inner Circle
Join Date: Dec 2002
Location: Augusta Georgia
Posts: 5,421
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Dear Kevin,
Sorry, but this is a very bad practice. Many manuals and electrical engineering (technical) articles report that you should not plug or unplug a microphone with phantom power on. Your equipment will be better off if you do not do this.
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Dan Keaton Augusta Georgia |
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February 13th, 2006, 04:17 PM
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#9 |
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Inner Circle
Join Date: Dec 2002
Location: Augusta Georgia
Posts: 5,421
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Dear Christopher and others,
I definitely endorse the turning off of phantom power while the microphone is still conected and turning off the phantom power before connecting the microphone. It is not a good idea to plug in the microphone while the power supply is putting out 48 volts. If you are about to plug in a microphone, and you discover that the phantom power switch is on, I would turn it off, and then wait a while before plugging in the microphone. This is to let the 48 volts drain down. In our previous discussion I did not mean to infer that plugging and unplugging phantom powered microphone inputs was acceptable. Sorry for any confusion that I may have caused.
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Dan Keaton Augusta Georgia |
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