Voltage differences Japan to Australia

I purchased a 27" Imac in Japan in May 2010. The specifications are as follows: iMac 27/2.8/2X2GB/1TB/4850-512MB. I now live in Australia and am wondering do I need a voltage converter in order to use the Imac. I also have a MacBook Pro and there is a voltage converter on the power cord. But there doesn't appear to be one for the IMAC. Voltage in Aus is 240V while in Japan it is 120V. I am worried that I will blow the machine up - if I just plug the Japanese power cord in. Please advise. Thanks Nick

NickLeah wrote:
do I need a voltage converter in order to use the Imac.
no. your Mac shipped with an universal power supply.
all you need is an adapter for the wall outlet or a replacement power cord (get it from a local Apple store or AASP).

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Normally the voltage difference is not a problem because the charger can handle both.
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This question was solved.
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Hi,
You should be fine - if you check the specifications label on the adapter block ( this may require a magnifying glass ), it should list the acceptable input voltages which is uaually between 100/110v to 240/250v.
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Regards.
R.Forrester
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Is there anything with wireless networks, wi-fi that would be different than the standards here in North- America?
No.
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Noisy fan in Japan

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I used to have a very quiet fan when I was in Singapore. Now that I'm in Japan, the fan is very very noisy and it's driving me crazy. Is it due to the voltage difference? In Singapore, it's 220V but in Japan it's 100V.
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Please reset the SMC.
SMC RESET
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
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Trying to measure voltage through SCXI-1127/1331 1-wire connection

We have NI hardwares like: 1) Chasis SCXI-1000, 2) DMM PCI- 4060, 3) MUX SCXI-1127 and 4) Terminal Block SCXI-1331
We have a system with two large glass plates standing vertically and placed parallel to each other each having 24 electrodes on them. Distance between them is 4-5 inches. The plates are places in such a way that the electrodes are on the outer side and accessible to the user. We are trying to flow different liquids of different density through the channel in between. Please find attached a picture of it.
So a total of 48 electrodes and hence, wires are connected, 24 on both sides. On each side there are 3 rows with 8 electrodes/row, making a total of 24 wires. Wire#1-24 are on side A (say) and wire# 25-48 are on side B (the other side). The medium between the two sides will be salted water (say for now).
We want to measure potential/voltage in such a manner so that we can calculate the voltage difference between all possible electrode combinations between side A and side B. Like V1-25, V1-26, V1-27,...,V1-48,V2-25,V2-26,........,V24-48, all 24 X 24 possible combinations. We are connecting two end of a power source to side A and side B so that there is some current flowing in the water.
I have connected wire# 1-48 to 1-48 in SCXI 1331 (left out the zero to avoid confusion). Now that I'm measuring values through the program attached ("Scanning_....vi"), I can see that the first 16 values are showing some values of standards E-2. But from 17-48 are showing values of standard 5E-3 and I guess they are not taking any values at all. Can you tell me why this might be happenning?
Can 1-wire measurement be applied for this scenario. If not then let me know how to achieve our goal. I can manually take a Multimeter and measure all the combinations one by one, but measuring all the values at the same instance would be better and that only can be done by automation and I hope that the NI hardwares I have, should be sufficient to do that. Please let me know if it is otherwise.
Another thing, in one of my previous contact with NI someone mentioned connecting 1_WIRE_LO_REF. Is it needed in this case? If yes, then if I connect one end to 1_WIRE_LO_REF, where should I put the other end?
In case the program is wrong or more than 16 values can not be taken please let me know alternate path or show me how to make changes in the program. I would appreciate your help in this issue. Thank you.
Message Edited by ERT_LSU on 09-17-2007 12:16 PM
Attachments:
Scanning_of_SCXI-1127_48_write.vi ‏144 KB
IM0000021.jpg ‏767 KB
IM0000041.jpg ‏722 KB

I connected the COM of my power source to the 1_WIRE_LO_REF. There are 4-5 points to connect. I choose the middle slot. Is there any significance of assigning so many slots to 1_WIRE_LO_REF?
No change in result. Can you please test run the program I attached and see whether it's correct or not. You'll see 48 segments getting the output. First 16 of them are showing some seemingly proper values. rset are either too small or as big as 5 V.
I'm providing 5Vs from the power source. You might have seen the old analog ones. I'm using one of them. there are different Voltgae option. I'm using the 5V and so I've connected a wire from the 5V connection to one of the electrodes on B side (28th electrode) and the COM ports goes to the A side (4th electrode) and also to 1_WIRE_LO_REF.
Now I'm thinking if the program if not working. Because it seems that we are getting (seemingly) proper values for the first sixteen and something's messing up the values for the the rest of the electrodes.
Do I have to use two 24X1 MUXs i.e, use physically different boards and also two different programs to measure them? Or I can just use 1-24 as 24X1 and 25-48 as another 24X1 in the same board and measure them through the same program? Thanks in advance.
Message Edited by ERT_LSU on 09-17-2007 04:00 PM

Trying to measure voltage through SCXI-1127/1331 2-wire connection [ Edited ]

Hai ,
     this is madhava from LSU,I am working on ERT with NI hardwares like 1)chasis 1000 2) DMM PCI-4060 3) SCXI -1331(2 in number)
I have a system with two large glass plates standing vertically and placed parallel to the user.I am trying to flow different liquids of density through the channel in between.Please see a attached picture of it.
    There are total of 48 electrodes 24 on each side to which wires are connected. On each side there are 3 rows with 8 electrodes/row, say 1-24 on side A and 24-48 on side B. The medium between the two sides is salt water.
     I want to measure the potential in such a manner that I can calculate the voltage difference between all possible electrode combinations between side A and side B.I have connected a two end power source to side A and side B, i.e. +ve to side A and -Ve to side B , so   the electrode on the A side acts as the "source" and the electrode on the B side acts as "sink".
    I want to use 2 SCXI- 1331 's for this experiment.
    I tried it with 1 SCXI - 1331, but did not get proper values.So what do you suggest shall I continue this with the 1 wire or could you please help me with the two wire experiment, so that I can get more combinations.
           I hope you respond soon and in the affirmative.
With regards
Madhava
Attachments:
Scanning_of_SCXI-1331_48_write.vi ‏144 KB

Welcome to the discussion forums, Madhava!
The optimal solution is to have a 2x48 (or more) matrix so
that you could easily choose one point on either plate (column) connected to
one lead of the DMM (row0) and another point on the other DMM lead (row1).
Since the SCXI-1127 doesn’t support this configuration, you’ll have to try
something else with your existing hardware.
Because you can only use a multiplexer setup instead of a
matrix for your number of signals, the closest you can get to the above
suggestion is to measure one electrode to ground and then read the next
electrode to ground and include logic to find the difference between the two voltages.
I suggest you start with a LabVIEW shipping example (Help » Find Examples) such as niSwitch
DMM Switch Synchronous Scanning.vi or niSwitch
DMM Switch Handshaking.vi (found under Hardware
Input and Output » Modular Instruments » NI-SWITCH). You will have to modify
it to include another SCXI-1127 and set them both up in a 1-wire 64x1 multiplexer
topology. Take measurements as quickly to each other as possible on both
switches. Again, this is a workaround to what you really should be doing for
optimal performance (and the easiest setup).
The last option is to limit your measurements to electrodes
directly across from each other (or any other fixed mapping setup) and use a
2-wire 32x1 multiplexer topology. By nature, this is taking a differential
signal measurement between two constant points. This would allow you to easily
use LabVIEW’s shipping examples without modification.
I hope this helps you get a feel for your options and the
consequences of each.
Mark E.
Precision DC Product Support Engineer
National Instruments
Digital Multimeters (DMMs) and LCR Meters
Programmable Power Supplies and Source Measure Units

MacBook Voltage Adapter question

Hello,
I am currently living in South Korea, and would like to purchase my first MacBook.
I plan on having someone bring it over for me, from the States, but I am a little worried about the voltage difference. I have heard that since the voltage is so high here, it will pretty much wear down the computer, even with an appropriate adapter...any truth?

The power adaptors for all laptops automatically switch from 110 Volt 60 cycle AC to 220 Volt 50 cycle AC used in most other countries. You may require a wall socket adaptor such as you will find in the Apple World Travel Kit.
The change in voltage will not "wear down the computer" unless the voltage where you are is above the 240 Volt typical maximum.

How do I read voltage on multiple channels using the 6255\SCB-68

Hi All
I was able to get the following code to compile, run and view the voltage data as expected. when reading the voltage (RSE) on Dev0/ai65
...National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Cont Acq-Int Clk\ContAcq-IntClk.c
* I think that I am using RSE but I have no clue since I do not see an argument to specify
I am trying to read two different data points:
1. View the voltage (RSE) on Dev0/ai65
2. View the voltage difference (Differential) between Dev0/ai17 and Dev0/ai25
Can someone point me to an example (or web link) where two different data points are being read.
*edit - I am trying to complete this task using C++
Thanks
Chad
Solved!
Go to Solution.

This was my last attempt that failed
#include <stdio.h>
#include <NIDAQmx.h>
#include <iostream>
using namespace std;
#define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle1, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle2, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
int32 CVICALLBACK DoneCallback(TaskHandle taskHandle1, int32 status, void *callbackData);
int32 CVICALLBACK DoneCallback(TaskHandle taskHandle2, int32 status, void *callbackData);
int main(void)
cout << "\t***************************************************\n";
cout << "\t         Starting the NI DAQmx data logger\n";
cout << "\t***************************************************\n\n";
int32       error = 0;
TaskHandle taskHandle1 = 0;
TaskHandle taskHandle2 = 0;
char        errBuff[2048] = { '\0' };
// DAQmx Configure Code
DAQmxErrChk(DAQmxCreateTask("task1", &taskHandle1));
DAQmxErrChk(DAQmxCreateTask("task2", &taskHandle2));
DAQmxErrChk(DAQmxCreateAIVoltageChan(taskHandle1, "Dev1/ai65", "", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCreateAIVoltageChan(taskHandle2, "Dev1/ai17", "", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCfgSampClkTiming(taskHandle1, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1000));
DAQmxErrChk(DAQmxCfgSampClkTiming(taskHandle2, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1000));
DAQmxErrChk(DAQmxRegisterEveryNSamplesEvent(taskHandle1, DAQmx_Val_Acquired_Into_Buffer, 1000, 0, EveryNCallback, NULL));
DAQmxErrChk(DAQmxRegisterEveryNSamplesEvent(taskHandle2, DAQmx_Val_Acquired_Into_Buffer, 1000, 0, EveryNCallback, NULL));
DAQmxErrChk(DAQmxRegisterDoneEvent(taskHandle1, 0, DoneCallback, NULL));
DAQmxErrChk(DAQmxRegisterDoneEvent(taskHandle2, 0, DoneCallback, NULL));
// DAQmx Start Code
DAQmxErrChk(DAQmxStartTask(taskHandle1));
DAQmxErrChk(DAQmxStartTask(taskHandle2));
printf("Acquiring samples continuously. Press Enter to interrupt\n");
getchar();
Error:
if (DAQmxFailed(error))
  DAQmxGetExtendedErrorInfo(errBuff, 2048);
if (taskHandle1 != 0) {
  // DAQmx Stop Code
  DAQmxStopTask(taskHandle1);
  DAQmxStopTask(taskHandle2);
  DAQmxClearTask(taskHandle1);
  DAQmxClearTask(taskHandle2);
if (taskHandle2 != 0) {
  // DAQmx Stop Code
  DAQmxStopTask(taskHandle1);
  DAQmxStopTask(taskHandle2);
  DAQmxClearTask(taskHandle1);
  DAQmxClearTask(taskHandle2);
if (DAQmxFailed(error))
  printf("DAQmx Error: %s\n", errBuff);
printf("End of program, press Enter key to quit\n");
getchar();
return 0;
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
//cout << "\nStarting EveryNCallback" << "\n";
//cout << "line 59" << "\n";
TaskHandle taskHandle1 = 0;
TaskHandle taskHandle2 = 0;
int32       error = 0;
char        errBuff[2048] = { '\0' };
static int totalRead1 = 0;
static int totalRead2 = 0;
int32       read1 = 0;
int32       read2 = 0;
float64     data1[1000];
float64     data2[1000];
// DAQmx Read Code
cout << "Start DAQmx Read Code Loop \n";
DAQmxErrChk(DAQmxReadAnalogF64(taskHandle1, 1000, 10.0, DAQmx_Val_GroupByChannel, data1, 1000, &read1, NULL));
DAQmxErrChk(DAQmxReadAnalogF64(taskHandle2, 1000, 10.0, DAQmx_Val_GroupByChannel, data2, 1000, &read2, NULL));
// for (int i = 0; i <= 10; i++)
//  cout << data[i] << "\n";
//cout << "Here is data = " << data << "\n";
//cout << "Here is data[2] = " << data[2] << "\n"; // write the data to a file
if (read1>0) {
  cout << "Acquired " << read1 << " samples \n";
  totalRead1 += read1;
  cout << "Acquired " << totalRead1 << " Total samples \r\n\n";
  cout << data1 << "," << data2 << "\n";
  fflush(stdout);
// cout << "the next line is stdout \n";
// cout << stdout << "\n";
Error:
if (DAQmxFailed(error)) {
  DAQmxGetExtendedErrorInfo(errBuff, 2048);
  // DAQmx Stop Code
  DAQmxStopTask(taskHandle1);
  DAQmxStopTask(taskHandle2);
  DAQmxClearTask(taskHandle1);
  DAQmxClearTask(taskHandle2);
  printf("DAQmx Error: %s\n", errBuff);
return 0;
int32 CVICALLBACK DoneCallback(TaskHandle taskHandle, int32 status, void *callbackData)
cout << "\nStarting DoneCallback" << "\n";
cout << "line 99" << "\n";
int32   error = 0;
char    errBuff[2048] = { '\0' };
// Check to see if an error stopped the task.
DAQmxErrChk(status);
Error:
if (DAQmxFailed(error))
  TaskHandle taskHandle1 = 0;
  TaskHandle taskHandle2 = 0;
  cout << "line 109" << "\n";
  DAQmxGetExtendedErrorInfo(errBuff, 2048);
  DAQmxClearTask(taskHandle1);
  DAQmxClearTask(taskHandle2);
  printf("DAQmx Error: %s\n", errBuff);
return 0;

[SOLVED] Fastest way to convert entire music library to ogg?

Hey,
I have a music library of about 100gb on my server, and since I'm starting to run out of space, I have been considering converting all the music (currently in mp3 format) to ogg vorbis to save some space, but not loose quality. I installed the mp32ogg script, which I tested on some mp3's. They became about 50% smaller and I didn't notice any difference in quality. (320kbps mp3 -> 160kbps ogg)
Anyways, the script does its job, but it's extremely slow. I'm at my parents place at the moment, testing it out on my old 35gb library, and it has been running since 3am to now (6pm), and it's not done yet (and my server is much slower than the desktop computer I'm running it on at the moment).
EDIT: OK, it just finished now. My library shrunk from 35.3gb to 28,6gb in 15,5 hours.
So I was wondering if there is a faster way to do this (as in another script/program)? Or should I just separate my library into say, ten subfolders and run an instance of the script in each of them simultaniously? I could also have my laptop run a few instances of it over samba, and my iMac too if the script runs on Mac OS X (probably does if I install some stuff from macports).
Another thing I was considering was converting it all to aac (which I believe would be even smaller?). The only script for that I found was audio-convert, but I didn't find any documentation on how to use it, and typing audio-convert --help just gave a bunch of error messages not related to the actual script at all. Obviously it didn't have a man page either, and by googling I only found a changelog etc. but no information about usage... Examples anyone?
Oh and obviously my server is CLI only, so no drag and drop converters please Also, I'm not really in a hurry with this, so it's OK if the conversion takes a few hours or even a day, but several days or weeks is completely unnacceptable.
Thanks in advance people
Last edited by pauligrinder (2011-04-21 17:09:06)

lives2evil wrote:Well, "My machines: Arch x5 + Windows 7 x2 + Mac OS X x2" => That's probably why he's broke .
I don't actually have 9 computers, I have OS X + 7 + Arch on both my Mac and my laptop, which already makes 6 then I have the server, which is an old laptop, and two nearly ten years old desktops which run Arch, so yeah. And I don't have the old ones at my apartment anyway. I'm broke because I just came back from a "world tour", visiting Japan and Australia... And also because I bought the iMac
Another reason why I can't buy a new HD for the server yet, is the fact that it's a laptop. It only has 1x IDE, and all my USB ports are already occupied by harddrives and my dtv-receiver, etc. What I will do someday soon, is turn my old desktop pc into a server. But that has to wait too, because I don't have room for it in my apartment (and it's too loud to sleep in the same room anyway). I'm actually waiting until I graduate and get a proper job, then I will upgrade the computer and make a server out of the spare parts.
I guess I'll mark this as solved now, since there doesn't seem to be a better way to do this.
Last edited by pauligrinder (2011-04-21 17:08:44)

Using your mini Mac in Europe at 220 V?

I am about to purchase the mini Mac from a Mac Store and have noticed in the specification for power input they have listed 110 V (US, Japan, South America). I spend my time between Europe and the US and would like to be able to take my mini Mac with me. I have gone to the European Apple sites and they have it listed there 110-240 V. Does that mean that if I purchase a mini Mac here in the States, I won't be able to use it in Europe because of the voltage difference, but if I purchase it in Europe I can use it both here and there? Has anyone ever used the mini Mac they purchased in the US in Europe?
Do tell, oh wise one....

There is some confusion as to whether the mini sold in the Americas and Japan is really only 110 volt.
One person reported in this forum a few months ago that they took a new Mac mini to the UK and the power pack burned out immediately when he plugged it directly into the local electric current with just a plug adapter.
However, a number of folks reported just last week in another thread in this forum that they have taken Mac minis bought in North America and used them successfully in various European locations with just a plug adapter without any harm.
Here is an example of a universal adapter that is usable in 150 nations. It will convert any plug to fit any electrical outlet. Plus it has a USB port to charge USB devices in any of the 150 countries. (perhaps overkill, but you never know when you may get a chance trip to Italy!)
Dah•veed

Voltage differences Japan to Australia

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