Test Equipment for Power Supply

Hi ,
I want to develop a test software for power supply using LabVIEW which we can use for our mass production.
We are currently using the following for the development stage.
1. Digital Multimeter(Topward 1330)
2.Oscilloscope(Agilent DSO 6054A)
3.Programmable AC Source(Chroma 6430)
4. DC electronic Load (Chroma 63030)
We are using GPIB as the programming interface.We also use NI-VISA, NI-488.2 from LabVIEW to communicate.
Since I am new to this domain, I need an expert help in programming this software.
Thanks

Dennis_Knutson wrote:
And for follow up questions, please don't post to this board. You have nothing related to NI's pxi chassis/boards.
p.s. And after the test specification is complete, perform the tests manually. You can't understand a programmatic approach if you don't understand the instruments and their capabilities.
"You can't automate what you can't do manually" is one of my favorite maxims.
Now is the right time to use %^<%Y-%m-%dT%H:%M:%S%3uZ>T
If you don't hate time zones, you're not a real programmer.
"You are what you don't automate"
Inplaceness is synonymous with insidiousness

Similar Messages

Want to Buy - G3/G4 Hex Screws for Power Supply.

I am looking to Buy - G3/G4 Hex Screws for Power Supply ( 3 ) These are the ones
that secure the PSU through the case in the rear.
Im not sure which other screws will fit and look like they belong.
If anyone has 3 lying around let me know the price so I can finish a project im working on.
Thanks,
Daryl G

Hey Jeff,
I think you meant a #6-32 hex drive cap screw.
Well I thought so at first but when I really looked at it and put it in my tap guide:
http://s291.photobucket.com/albums/ll306/spudnuty/?action=view&current=G3-G4PSUs crew.jpg
it's a #6-40. BTW that screw is from a G3 B&W it's the same as the one from the Sawtooth and that's a #6-32 next to it.
I think they're fairly easy to find. You could retap the holes to #6-32 but that would run the risk of metal chips floating around the power supply.
Richard
Message was edited by: spudnuty

Searching Dock with for Power supply and Audio Out for iPhone 3GS

Hello,
I am rather new to Apple stuff but I now have an iPhone 3GS which I would like to use with my Yamaha Pianocraft.
The Yamaha has an optional iPod Dock. As far as I know, this would allow me to do things like pause, next track etc. via the Yamaha remote. However, I don't really need this and I would also like to be able to play audio from apps such as internet radio apps (e.g. 977)
So the Yamaha also has an AUX/Audio In connector on the back where I can simply connect my iPhone 3GS. Then I will just hear everything not through the iPhone speakers but through the Yamaha A/V Receiver.
However, this option would require me to have a cable connect at the top (headphone jacket) and at the bottom (connector for power supply), which does not look that good.
So I would like to have an iPhone 3GS dock that provides audio out as well as power supply. I have found three products for this (German Sites because I live in Germany):
Apple iPhone 4 Dock:
http://store.apple.com/de/product/MC596ZM/A?fnode=MTY1NDAzOQ&mco=MTgxNTkwOTg
Apple Universal Dock:
http://store.apple.com/de/product/MB125G/C?fnode=MTY1NDAzOQ&mco=MTA4NDc4NDA
Amazon:
http://www.amazon.de/Dockingstation-Apple-iPhone-Audio-Out-wei%C3%9F/dp/B003UP77 HQ/ref=wlit_dpo?ie=UTF8&coliid=I18C98SXGWLNIF&colid=29EKL14S3VRAN
As far as I am aware, the iPhone 4 Dock from Apple cannot be used with the iPhone 3GS. Is that correct? Is there any solution or an "iPhone 3GS Dock" available?
Can these docks also provide the audio from apps via audio out?
I hope you can help me.

Well on the backsite this product has audio out but not power, only the iphone connector.
If I want to use this station in one place only and not for syncing, I will have to buy another iPhone USB cable and another wall to USB adapter (altough I have come at home from other products).
Is there no dock that will not require some special iPhone cable?

Test Equipment for calibration

Dear Experts,
Is it necessary to create Calibration Orders against Test Equipments only ?? or we can do the same against Machines also??
As in some cases there is preventive & calibration plan against same equipment then if we create Test equipment,, there is going to be doubling of equipment??
Plz guide
rgrds
DM

Dear DM,
For the same Equipment U can distinguish one is M - Machine , and Q- Test Equipment categories.
So u can do preventive maintenance and caliberations plan also
If u not clear pls come back
Regards
SMC

HP Deskjet D1560, Need Part numbers for power supply parts

I have an HP Deskjet D1560 still in the box. Does not have power adapter and power cord. (My daughter took them for her printer.) Where can I find the part numbers for the power supply parts? I live in the U.S., so I need the power cord that will fit in a U.S. outlet. The power cords in the product section are for the Middle East, Europe, and England. I need the one for the U.S. Where can I find that part number?

The power supply is part number 0957-2231 and the associated US cord is part number 8121-0889. I usually pick these up on eBay if I need a power supply, see the listings here. Make sure the power cord is included, it may be listed as a seperate item.
Bob Headrick, HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

Intel Xserve Blower for Power Supply 1 Out drops to 0 RPM momentarily

10.5.6 Server. Machine is less than a year old. Yesterday I configured Server Monitor for the first time and have received two notifications of the blower for the Power Supply Out changing to zero RPM. It is momentary and goes back to normal.
Everything else is in the normal range -- temp, voltage.
Is this normal or indication of future failure?

Hi Forum folks.
I've had a 6-month (ish) Xserve doing the same thing. Every day, at least once a day, I'd get an email / SMS, saying the power supply or blower was having a momentary problem.
After shutting down the server, I pulled out the Power Supply Units, and checked them out.
Turns out, one of them had a slightly damaged heat sink (damage visible without opening the PSU). So, I swapped it for a spare I'd purchased. And then got the damaged unit (damaged internally at factory by the look of it) replaced by my Apple Reseller.
Note: the newer Intel XServes (early 2008) have a 750w PSU, compared to a 650w PSU, in the 2006 Intel XServes. The older PSUs fit in the newer Xserves, but they DO NOT function. (You'll get an error in Server monitor).
Hope that helps,
Cheers,
Derek

How to test if MDD power supply is bad or it's Something Else

Ok,
I've had a MDD for 4 years. Dec 2007 the PSU died. I had it replaced under my renter's policy (yeah..) the new rev. part was $870!. I Didn't care... insurance paid for the repair.
Now, after 1.5 years, I was having disk corruption issues which led to numerous forced shutdowns (no reset button on the MD) finally, after about 5 of these in one day, the power on light lit when pressed, and I heard a crackle & smelled a a bit of smoke. I pulled the power cord immediately.
btw pressing the power button now did nothing at all, no "fan attempts" no crackle.. nothing.
Same deal, I called the ins co, took MDD to the authorized techs, who checked & said the PSU was dead... again.
The Ins Co. is "totaling" the MDD and I'm looking for a used G5.
BUT! I'd love to get the MDD working again. Just to have it as a second machine.
I've read a bunch of threads here on this issue & testing the PSU.
I'm not a super geek, but I can follow instructions... which I did. There's a great online instruction set with pics and all, about how a guy found a bad solder by disassembling the PSU.
I followed it step by step. Saw nothing remarkable.
Then I came here looking for steps to test the PSU (I'm starting to wonder if it's more than that).
I found a diagram of the pins and voltages.
Connected the PSU the the juice and started testing the connector, where it plugs into the motherboard.
Here's what I found (connected to power but obviously still not starting the computer):
Pin 1 (says +5volts sb, which I assume means stand by?) with the black lead from the tester inserted into pin 2 (gnd). It read 5 Volts.
No other pins showed ANY voltage EXCEPT pin 14 (which says +25Vsb). That read +24.8V when tested.
What I DON'T know is...
If disconnected from the MDD, should all the pins read voltage as the pinout diagram says? I'm brand new to this level of diagnosis.
I'm wondering if maybe the CPU fried etc.
Also, while trying to determine if the power button might be faulty I broke the switch off (duhh). Shorting across the two stubs that were left there didn't produce any powerup either (it's just a 2 pin contact switch right?)
So I need to know if I have accurately found the PSU to be bad. I can get one on ebay for $150-ish.
But I'm worried, since this was a +*new super better PSU*+ and it (possibly) has died, maybe something on the motherboard etc. isn't right.
The machine hasn't been connected to power for 3 weeks & yes, the battery is now dead. I swapped it out, and reconnected the PSU... nothing.
+*So first, did I correctly test the psu?*+
there was a dead link to a MDD repair manual on another thread. First I have to figure out IF the psu is dead, and then decide if something else KILLED it.
Help? I'm using wife's G4 and she's getting real PO'd after 3 weeks!
Thanks to anyone in advance.
Tom

Hi,
Thanks. By power button board, Do you mean the unit that has the power button on it? On the case front?
If so, I mentioned the switch broke while I was testing. I guess to continue I have to get a new switch.
I will pull the mini-board for the power button though to look for signs of damage.
Can I get a new switch to solder on to the board, if the board looks good. The orig. switch physically broke off the board. It's a standard contact switch correct? i.e. press and there should be continuity between the two pins? I'll pull the board as well.
I've already checked the PSU interior. No burnt wires visible anywhere. There's a lot of grey goo glue used so it's hard to see, but since the PSU passed the two passive power tests you mentioned, are we for now assuming it is a good PSU?
Other discussions I've read, describe continuing to test different pins and look for appropriate voltages. That doesn't make sense to me with the computer not starting up.
Aren't the rest of the voltages supposed to show ONLY after the command to supply startup power is given (by the power switch)?
Processor "looks" good too, no signs of burnt anything after pulling the heat sink, but I haven't removed the logic board or the mother board yet to look underneath.

CDC API for power supply and standby

Hi to all,
i have to wake up a java application developed under CDC when the PocketPC is under standby. Example: i have a timer, operator turn standby on pocket pc, and after that time i have to wake up the pocket pc. I do not have problems to develop in C++ and with JNI, so can anyone give me some information to resolv that problem?
Thanks,
Muzero

Well on the backsite this product has audio out but not power, only the iphone connector.
If I want to use this station in one place only and not for syncing, I will have to buy another iPhone USB cable and another wall to USB adapter (altough I have come at home from other products).
Is there no dock that will not require some special iPhone cable?

Finding power supply that works for 6251 mega pc

Hi! I just bought a 6251 on ebay. The person said the unit was like new (ha, ha)..I asked questions about the power supply & was assured it would work. Surprise, surprise...got it 2 days ago & the fan does not work (no spinning). I tried using a can of air to get it going, but no luck.
The model in it is a enhance 2920. I wrote to MSI...no help at all. Can't find the fsp250-60ms model either anywhere stateside. Is there any alternative?
Thanks,
M.

I end up in a loop going nowhere...one of my replies was the following:
Dear Customer,
Your email contains inquires that will be needing our technical support dept to answer or you are requesting a part/accessories for our product lines, which out tech support dept. handles. Please go to http://www.msicomputer.com/msiapps/ts_form.aspx to fill out the form in order to put your inquiry through our tech dept. Only the fields with "*" are needed to be filled. However, if you cannot fill out all the required fields, just simply put "n/a." There is also "Problem Description" field at the very end of the form, where you can type is specifically what your inquiry is. If you prefer to call them, you may do so @ 626 581 3001 and press the option for tech support. Our tech dept has high call volumes every day, and ½ staffed during lunch hours (12~2pm). If you get asked to leave a message and prefer not to leave a message press "0" at the voicemail greeting prompt and ask the operator to "connect you to a technician." Thank you.
I tried filling out the form & got nowhere. My original inquiry was the following:
To: MSI RMA
Subject: looking for power supply
I am looking to buy a replacement power supply for the MSI mega pc model no 6251. It is model no. FSP250-60ms.
Sincerely,
I also tried FSP group & got the following reply:
Thank you for your e-mail inquiry.
Regarding this model FSP250-60MS
This model is not a standard model of our product line.
This is a special proprietairy modeification on output contector PD & PE
The output voltage on PD & PE is +12Vstandby instead of +12V, +5V standby instead of +5V
We have no stock of this special item.
Please contact your computer supplier and ask for after sales service
Thanks
I cannot contact the supplier as I bought the computer on ebay.
so....am still trying to get ahold of a new power supply.
Thanks,
M.

Is it the power supply... or the motherboard?

Lets start of with specs...
K7T266 Pro2 Mainboard
AMD Athlon XP 1700+
nVidia GeForce 3 Ti 500
Creative Labs Audigy MP3
Western Digital 80 GB Hard Drive (7200RPM)
IBM 40 GB Hard Drive (7200RPM)
Mmkay now... I just installed some nifty lights and a window on my case, I don't think that is the problem though. Whenever I go to putting in the 20 pin ATX power supply thingee, nothing happens to the mainboard, nothing lights up... sometimes when I put in the cable different ways, or with my hand further away from the connecter, the lights get a faint glow, the fans turn on, but the hard drives don't. This has happened 3 times to me, and I don't know what the problem is.... the first time it happened I thought my power supply was fried so I ran out and bought a PSU tester, all was fine so I knew it had to be the mainboard. It wasnt. Some of the little doodahs inside the connecter from the power supply werent pushed in (or is it out?) far enough, aka some wires were just slipping out from the connector. The second time, I went to take apart the computer to dust it and the same thing happened.
This time, is the first time I had the lights and the window on the case, so when I plug in the PSU tester to the power supply, everything lights up and turns on (except the mainboard which isnt plugged in). So then I plug it into the mainboard's connecter, it doesnt turn on. I have been fiddling with it for 20 hours and even used a dremel to shave off some of the plastic on the PSU's connecter, so the wires in the mainboard would hit the ones on the connecter. They didn't.
Now I am asking you, if you can understand what I just said ( :D ), what is wrong with my computer.
I'll take some pictures and show you what is happening...

I do not think it is the connector to the MB, the PSU or the Mobo. I think you somewhere have a short-circuit. It might be that it is in a place so that it only occurs when you have "fiddled" with the innards of your case.
Try and search for anything that might be causing a short circuit.
Remember that some lights (dont know correct english word for the type here) might in some situation be considered a short circuit (and might cause your PSU not to power up).

New Power Supply?

Any ideas where I can find a replacement power supply (cord) for my Airport Extreme? My basement flooded and although the base station was on a table top the power supply was on the floor in water. I dried it out for days and it just won't power up. Had this happen on a few other pieces of equipment and power supply was all that needed replaced. Hoping for the same on my Airport...
Thanks in Advance...

A number of vendors provide these. I just did a quick Internet search on "AirPort Extreme Power Supply" and I got at least a dozen hits. I suggest you give it a try and shop around for the best deal.

Interfacing LabVIEW with PS-325 power supply

Hello guys, I have a power supply from Stanford Research systems, PS-325. This power source have a comunication port with pc that requires a KUSB-488B cable. I have installed the drivers necesary for this cable and drivers for power supply from NI site, but doesn't work. I have a dedicated GUI from Keithley with i have tested the cable and conection, and all good but in LabVIEW doesn't work. I have made a simple VI to set the voltage to power source and I'm getting ERR (-10737807343). Can anyone help me with this? maybe somebody have a VI for this power supply. Thank you!
Attachments:
hv_vi.jpg ‏58 KB

It doesn't require a controller from Keithley. That's a choice that you or someone else made and not exactly a good choice. If Keithley provides its version of VISA, you need to install that but also NI-VISA as primary. The actual gpib driver must come from Keithley. You probably need to enable tulip support as well. The controller and instrument have to be listed in MAX.

Is a bad logic board due to a bad power supply?

Computer specs:
iMac G5 20", 2.0 ghz, 1 GB RAM, 250 GB hard drive
Back in October of 2008 my iMac G5 Power PC shutdown intermittently and then when I went to go to start it back up, it booted to the blue screen and hanged there forever. So, I did a hard shutdown and then waited and then booted again and it still hanged at the blue screen. I tried booting in Safe Mode, and that worked, so I had a chance to backup everything that I needed to. Then, I took the computer to my local Apple Store to speak to a "genius". They could not diagnose my computer while I was there, so they needed to take it overnight and let me know over the phone what the issue was. The next day they called to tell me that it was a Logic Board issue and that it would cost $900 to fix it. I obviously was blown away at the cost for the problem, and I could not afford that charge so I seeked out other options. I found a shop in my neighborhood that offered me a used 1.8 ghz logic board for half of what Apple was quoting me, so I went with it. Then, 9 months later (which brings us to present) my iMac completely shutdown on its own and would not start up. I ran it through some tests (LED lights on the interior) and confirmed that it was a Logic Board issue again. So, I took it back to the shop in my neighborhood and they told me that the warranty for the part they replaced had expired. So, I called Apple Customer Relations to talk to them about the issue. They confirmed, using my serial number, that I could get my issues fixed for free. They then told me about the "iMac G5 Repair Extension Program for Power Supply Issues" which was news to me. This Program ended in December of 08, meaning I would have qualified in October of 08... the time I initially brought in my computer. So, I brought my computer to the Apple Store to drop it off for repairs, and when going over the history of the machine they confirmed that because there was a used 1.8 ghz part in my machine installed from a non-authorized Apple place that they COULD NOT fix my issues now.
My question is:
Back in October of 2008 when I brought in my computer to the Apple Store and they diagnosed it with a bad Logic Board, could that have been because of a bad power supply? If that was the case, does a bad power supply cause a Logic Board to go bad?

Welcome to Apple Discussions.
The short answer is no, but it's actually more complicated than that. The original iMac G5 17 and 20 inch models were plagued by two problems: defective capacitors which affected the logic board, and an unrelated set of defective capacitors which affected the power supply. Rarely were both conditions present at the same time, but Apple decided—when they issued the repair extension authorization—that replacement of both components was a more cost effective approach. By far, the most common of the two problems involved the logic boards.
The REA covered machines for a period of three years from first sale, and ended in December of last year. Yours likely would not have been covered due to the date of sale provision. On a case by case basis, AppleCare representatives did allow coverage for machines beyond the three year limitation, but not past the end of last year.
It's not likely that you have both a defective logic board and power supply, though you may. The combination of these issues is actually found most frequently in the iMac G5 ALS models, none of which were covered by a repair extension authorization.
Your issue is a difficult one, as Apple authorized dealers and service providers have every right—and, actually, a responsibility under their annual agreements—to reject warranty, AppleCare or REA coverage for parts or labor when compatible but not similar logic boards have been placed in your machine. This is because they must exchange these parts for the part they are requesting from Apple on a like-for-like basis, and that part must be associated with your machine serial number. In trying to resolve your issue, the shop in your neighborhood actually created an additional issue for you which would only be triggered in the event of component failure. I have no idea what period of coverage they typically offer, but Apple provides for 90 days or the balance of any warranty or AppleCare extension in place at the time of the repair, whichever is greater.
Your logic board can be refurbished for $ 189.00 if it in fact exhibits the capacitor issue. That process is covered by a one-year warranty. If you are interested in exploring that option, send a message to the electronic mail address in my Public Profile and I will reply with additional information. To help determine additional information concerning your machine, please include the machine serial number if you elect to do write for more information.

How to Replace Power Supply

I'm stuck with what I thought was going to be an easy job - compared to a G5 tower or an iMac.
I need to replace the power supply in my Mac Pro (2008) but I'm stuck at getting the small cover off. I've removed the metal plate that was under the optical drives (POV when looking through the side). But it seems there's a small cover for the power supply that's similar to the big processor cover for the liquid cooled G5 towers. I can't figure out how to remove that.
Does anyone have a link to a manual or take-apart guide for the Mac Pro?
Thanks!

Before you begin, open the computer, lay it on its side with the access side facing up, and remove
the following:
• Hard drives and hard drive carriers in drive bays 3 and 4
• Optical drive carrier and optical drives
• Any PCI Express cards that block access to the power supply mounting screws
1. Using a short-handled, magnetized 2.5 mm hex screwdriver, remove the four power supply
mounting screws from the bottom of the media shelf.
2. Depress the upper right corner of the power supply and slide the power supply toward the
front of the computer.
3. Lift the power supply a short distance and rest it on the edge of the enclosure.
4. Starting with the top connector and working down, disconnect the four connectors on the
power supply cable from the four connectors on the power harness cable. Note: You must release the locking latch on each power supply cable connector before detaching the connector.
5. Remove the power supply from the enclosure.
Replacing the Power Supply:
1. Rest the power supply on the edge of the enclosure so that its cable can reach the media
shelf divider. Note: The following four steps explain how to reconnect the power supply cable connectors with the power harness connectors. When the power harness connectors are in their original position in the media shelf divider, it is not possible to see where they mate with the power
supply cable connectors. Therefore, the next step shows how to temporarily remove the power harness connectors from the divider for a better line of sight.
2. Starting with the top connector and working down, release the four power harness cable
connectors from their openings in the media shelf divider. Note: Each connector has two locking latches that hold it to the divider. To release the connector, depress the bottom latch first and then the top latch. You may find a flat-blade screwdriver useful in depressing the latches.
3. Placing a hand on either side of the media shelf divider, thread the J1 connector on the power supply cable through the top connector opening in the media shelf divider and connect it to the PS1 connector on the power harness. Repeat for the other three power supply cable connectors.
4. Important: The first three connectors on the power supply cable are marked J1, J2, and J3; the fourth connector is not marked. The four connectors on the power harness cable are marked PS1, PS2, PS3, and PS4. You must connect J1 to PS1, J2 to PS2, etc.
5. Starting at the bottom connector and working up, depress the locking latches on each power harness connector and reinsert it into its opening in the media shelf divider. Important: Test that all power supply cable connectors and power harness connectors are fully seated by tugging on the cables on both sides of each of the four paired connectors.
6. Fold the power supply cable on the bottom of the power supply bay.
7.Lift the power supply and holding the power supply at an angle, llower it into the enclosure until its
upper right corner slides under the corner lip of the enclosure.
8. Slide the power supply toward the back of the computer as far as possible.
9. Make sure the power receptacle aligns with the opening in the enclosure’s back panel and
the four screw holes in the power supply align with the screw holes in the media shelf.
10. Replace the four power supply mounting screws.

Power Supply Fan Always Runs Full Throttle - Mac Pro (Early 2008)

My Mac Pro has been almost flawless since I purchased it new in February 2008. I did not purchase the AppleCare because I rather naively assumed at the time that my shiny new Mac Pro was an invincible machine. (I was seduced by Apple after all!) Well, that was when I was younger (about 2.5 years ago) and before I knew about the actual cost of things like Logic Boards and Apple Power Supplies... Now the $250 AppleCare lifeline seems like a bargain!
The Problem:
1 week after installing Windows 7 64-bit to a separate internal hard drive using boot camp 3.1, my Mac Pro was playing music from the local iTunes library in Snow Leopard when the power supply fan revved up to 2760 rpm! I immediately tried rebooting the machine, resetting the PRAM and SMC several times, but the fans continue to throttle up to almost 2800 rpm within seconds of powering on the Mac.
I have run the Apple Hardware Test several times and every time it generates the same error code within 1 loop of either the extended or regular test:
4SNS/1/40000001: lp0C-0.000
An Apple Support technician was kind enough to "sneak" me a little bit of information about the error code. He told me the message is Logic Board Sensor related and could be caused by a faulty Logic Board, Sensor Board (Ambient Board?), Power Supply or possibly a faulty sensor that might be repairable.
Emotion:
Other than my 6 month old daughter eyeing the Mac Pro with the same suspicion she reserves for the Dyson vacuum cleaner, the computer still works fine--it hasn’t crashed in either Windows 7 64-bit or Snow Leopard and I haven’t noticed any unusual behavior. I had one other problem with this computer about 1 year ago when I installed Vista using boot camp. About a week after the Vista install, the OEM ATI HD 2600 XT completely died and I replaced it with a GTX 285.
I have grown a little suspicious about the efficiency of boot camp in the Windows environment, but perhaps the 2 separate boot camp installs and subsequent hardware failures are coincidence or related to the hardware issue I am yet to resolve...?
Hopefully, someone in the Apple community will offer guidance to a swift and economical solution!
Thank you in advance for your time.
Some Data:
iStat Pro Info
CPU
User: 0%
Nice: 0%
Sys: 0%
Idle: 100%
TEMPs (in Fahrenheit) - There was no entry for Power Supply Temp in iStat!
HD1: 90
HD2: 90
HD3: 92
HD4: 92
CPUA: 88
CPUA: 86
CPUB: 88
CPUB: 86
Ambient: 76
Expansion Slots: 94
HD Bay1: 83
HD Bay2: 83
HD Bay3: 83
Hd Bay4: 81
Mem Bank A1: 106
Mem Bank A2: 99
Mem Bank A3: 99
Mem Bank B1: 92
Mem Bank B2: 92
Mem Bank B3: 94
Mem Module A1: 130
Mem Module A2: 126
Northbridge: 106
FAN SPEED (rpm)
Power Supply: 2760
Exhaust: 600
CPU Fan: 500
HD/Expansion: 800
Hardware Overview
Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 2 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4

I had the same problem. The solution was replacing the Power Supply.
Because i had Apple Care there where no costs.

Test Equipment for Power Supply

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