FAQs

FREQUENTLY ASKED QUESTIONS

 

Click each question below to reveal the answer:
Active Leads
What is the long wire (snap) on channel 1 for? Do I need to put it on the subject?

The long wire on channel 1 is called the reference/ground. This reference/ground must be on the subject to get valid data.

Where should I place the reference/ground lead?

In the past, the recommendation was to place the reference lead on a bony prominence; however, with today’s technology you can place the reference lead anywhere on the body.

I want to put the reference/ground lead on a bony prominence, but the cable is not long enough.

A “Snap Lead Extender” (part # SLE) is available for purchase in 3 lengths: 12″ (30.5 cm), 24″ (61 cm) and 36″ (91.4 cm). For more information or to order this product, please email Noraxon’s customer service at info@noraxon.com or call 480-443-3413 (US/Canada customers may call 1-800-364-8985)

A lead is not working properly, but I still want to use that channel. Can I put another 2-snap lead with a different number into that channel?

The number on the 2-snap or pinch end Active Pre-amp leads are only labels. You can plug in the 2-snap or pinch end lead into any available Analog connector.

I am getting irregular signals. How do I determine what is wrong?

There are several possible reasons why you are getting an irregular signal. 1) Electrode Problems: e.g. dried out or expired electrodes, skin preparation not adequate, electrode coming off 2) Unused leads that are connected to the Noraxon System are not “shorted out”. This allows noise in the environment to affect the signal of the leads on the subject’s body. 3) Occasionally – The pre-amp lead is not functioning properly. 4) Rare – Analog Connector on Noraxon System is not functioning properly. For detailed troubleshooting techniques, please refer to the document Troubleshooting Irregular Signals

Electrodes and Skin Preparation
How do I prepare the skin for EMG measurements?

The Skin Preparation video tutorial demonstrates the procedure. For additional information, please refer to the ABC of EMG Manual section Skin Preparation, pg 15.

I’ve prepared the skin as recommended in ABC of EMG, but the signals are not accurate enough and my subjects are complaining about skin irritation.

We have found that an Abrasive Skin Prepping Gel for ECG & EEG, e.g. NuPrep ™, usually solves the problem.

General System Requirements
Computer System Recommendations

The following are the current specifications for computer systems needed to run the various software programs that are distributed by Noraxon. These specifications are subject to change without notice due to the volatility of the computer industry. It may be assumed that systems shipped by Noraxon will meet or exceed these specifications. Systems quoted with these specifications are good for three months after the date of the quotation.

Processor: Intel Core™ I7 Processor or AMD A8-3500M or better
Memory: 4GB RAM or higher
Hard Drive: HDD 500GB or higher
Graphics board: NVidia 540 M or Radeon HD 6620G or better models (most Intel graphics cards will NOT work)
OpenGL: 3.3 or higher
Monitor: 17” full HD (for mobile use, 15” HD will also work)
Keyboard: Standard PC KeyboardM
Mouse: with clickable scroll wheel
Ports: 3 USB Ports (if already available 2 x USB3 and 1 x USB2 or vice – versa)
O/S: MR3:Windows 7 32/64 bit
MyoPressure-T: Windows 7 64 bit
Video Codec: The video codec is automatically installed when software is installed.
These computer specifications must be met for all customers who are purchasing MR3 or MyoPressure-T software for use with up two HD Pro Webcams using USB.

It is also recommend that an external hard drive or memory stick with USB 2 or USB3 (preferred) connection to the PC/Notebook be available for data backup.   Lastly, although your computer may have the hardware indicated above, it is highly recommended that you update your graphic board drivers by going to the manufacturer’s website.   Noraxon is a registered trademark of Noraxon U.S.A. Inc. Intel Core™ is a registered trademark of Intel Corporation. Microsoft, Windows XP, Vista and Windows 7 are registered trademarks of Microsoft Corp. All other company and product names contained herein may be trademarks or registered trademarks of their respective companies and are sole property of their respected owners.

Import Export Data
How do I copy MRXP data from one PC to another?

Please refer to the video tutorial Copy myoRESEARCH XP data to another PC

How do I copy data in MRXP to a newer version of MRXP?

Please refer to the document Copy Data from myoRESEARCH XP

How do I backup data in myoRESEARCH XP?
When do I use "export/import" and when do I use the "copy" function in myoRESEARCH XP?

Copy: Use with MyoResearch XP data, e.g. backing up MRXP data, copying MRXP data back into MRXP.

Import/Export: Use when you are importing or exporting files from other sources, i.e. not MRXP files. If you want to save the MRXP data to another file type, then use Export and select a file type from the pull-down menu. The process is similar to Importing data from another file type into MRXP.

How do I copy data into myoRESEARCH XP?

Please refer to the document How do I do that in MRXP

How do I copy an Application/Protocol into myoRESEARCH XP?

The document Copy an Application/Protocol into MRXP explains the procedure with step-by-step instructions.

How do I install the MRXP patch?

You must have version 1.06 or higher in order to apply a patch to MRXP. Earlier versions, e.g. 1.03, 1.04, 1.05, do not have this feature.

1) Download the current MRXP patch

2) Exit from myoRESEARCH XP before installing the patch.

3) Run the “exe” file that you downloaded and a wizard will help you install the patch. A password is not required to install the patch.

Introduction to myoRESEARCH XP
How do I copy files from myoVIDEO into MRXP?

Please refer to the myoVIDEO tutorial

How do I copy MRXP data from one PC to another?

Please refer to the video tutorial Copy myoRESEARCH XP data to another PC

How do I copy data in MRXP to a newer version of MRXP?

Please refer to the document Copy Data from myoRESEARCH XP

How do I backup data in myoRESEARCH XP?
When do I use "export/import" and when do I use the "copy" function in myoRESEARCH XP?

Copy: Use with MyoResearch XP data, e.g. backing up MRXP data, copying MRXP data back into MRXP.

Import/Export: Use when you are importing or exporting files from other sources, i.e. not MRXP files. If you want to save the MRXP data to another file type, then use Export and select a file type from the pull-down menu. The process is similar to Importing data from another file type into MRXP.

How do I copy data into myoRESEARCH XP?

Please refer to the document How do I do that in MRXP

How do I copy an Application/Protocol into myoRESEARCH XP?

The document Copy an Application/Protocol into MRXP explains the procedure with step-by-step instructions.

How do I install the MRXP patch?

You must have version 1.06 or higher in order to apply a patch to MRXP. Earlier versions, e.g. 1.03, 1.04, 1.05, do not have this feature.

1) Download the current MRXP patch

2) Exit from myoRESEARCH XP before installing the patch.

3) Run the “exe” file that you downloaded and a wizard will help you install the patch. A password is not required to install the patch.

MVC (Amplitude Normalization)
What does "MVC" mean?

MVC is an abbreviation for Maximal Voluntary Contraction. Usually static resistance is used to create a “maximum” contraction value for that muscle. The MVC value is then used to convert the muscle uV values into a percentage of the MVC. For more information, please refer to the ABC of EMG Manual section Signal Processing – Amplitude Normalization, pg 30-35

When should I use the MVC?

In SEMG analysis, the amplitude of the data are strongly influenced by many detection conditions, such as electrode placement, changing environmental conditions, different subjects, etc. If you plan to compare across recording sites, across patients, across sessions or to a published standard, Normalization is necessary. For more information, please refer to the ABC of EMG Manual section Signal Processing – Amplitude Normalization, pg 30-35

What are the steps to perform and calculate a Normalized Value?

1) Identify and perform a standardized isometric procedure for a defined time period

2) The SEMG activity is averaged for a fixed time period to find the highest AVERAGE peak value. This mean becomes the normalization reference value for the muscle.

3) Perform the evaluation task. The clinical task mean is divided by the MVIC mean and multiplied by 100 to find the Normalized Value. Baseline Value ÷ Maximal Effort X 100 = Normalized Value (expressed in %MVC) For more information, please refer to the ABC of EMG Manual section Signal Processing – Amplitude Normalization, pg 30-35

How do I copy data in MRXP to a newer version of MRXP?

Please refer to the document Copy Data from myoRESEARCH XP

What is the best way to perform a MVC?

Please refer to the ABC of EMG Manual section Signal Processing – Amplitude Normalization, pg 30-35

What are the steps to record the MVC in myoRESEARCH XP?

Real-time processing is recommended to calculate the MVC. The MVC in Real-time video tutorial demonstrates how to create and apply the MVC in Real-time in MRXP. The document MVC Normalization in myoRESEARCH XP: Post-Process Method describes how to calculate the MVC after recording the data.

Which values should I use in myoRESEARCH XP for the Amplitude Normalization (MVC) setup?

Please refer to the ABC of EMG Manual section Signal Processing – Amplitude Normalization, pg 30-35

What does "MVC stack" mean? How does it save my data?

The MVC values are saved in a file. A “stack” is a computer programming term that indicates the method used to store the data. Every time you save data to the “MVC Stack” , the current values are replaced with the new values.

Where do I find the MVC microvolt (uV) value in MRXP?

You must have version 1.06 or higher in order to apply a patch to MRXP. Earlier versions, e.g. 1.03, 1.04, 1.05, do not have this feature.

1) Download the current MRXP patch

2) Exit from myoRESEARCH XP before installing the patch.

3) Run the “exe” file that you downloaded and a wizard will help you install the patch. A password is not required to install the patch.

myoSYSTEM 1400A
I am not getting any auxiliary signals from my 1400A.

Check the toggle switch on the front of the MS1400A – is it on “cable” or “BNC”? Switch it to the auxiliary source you are using. In the channel setup in MRXP, the Aux inputs are channels 17-20.

I need to install the USB driver for the myoSYSTEM 1400A. How do I do that?

The video tutorial (no audio) myoSYSTEM 1400A USB Driver Installation explains how to do it.

myoTRACE 400
The charging light on my myoTRACE 400 is not on even though it is plugged in securely.

Even though the charging light on the myoTRACE 400 is not on, in most cases, it is still charging. In order for the charging light to illuminate, you will need to plug the charger first into the myoTRACE 400, then into the wall outlet. For more information, please refer to the myoTRACE 400 manual

I charged the myoTRACE 400 battery until its yellow charge indicator was extinguished but the myoTRACE 400 display is not showing 100%

When the battery is fully charged but the myoTRACE 400 display does not show 100%, information in its fuel gauge (charge indicator) is ‘out-dated’ and must be revised. The battery fuel gauge is able to learn new settings automatically. To do this you will need to fully discharge and recharge the battery at least two times. To discharge the battery, turn the myoTRACE 400 on and let it run until it shuts off. (A convenient way to discharge the battery is to let the myoTRACE 400 run overnight.) It will take around 3-4 hours for the battery to recharge. Repeat this a second time. If this solution does not solve the problem, please email Noraxon’s technical support at support@noraxon.com or call 480-443-3413 (US/Canada customers may call 1-800-364-8985)

I am getting the error "USB cable is disconnected" in myoRESEARCH XP, but my USB cable is connected to the PC Interface and the PC.

This error is usually resolved by installing a patch. If you are using myoRESEARCH XP 1.06, you will need patch 1.06.78. If you are using 1.07, you will need patch 1.07.05. These patches are available on our software download page. MRXP Software Patches

Passwords Activation Code
The software is asking for an Activation Code. What number do I enter?

An Activation Key is displayed in myoRESEARCH XP in the same window that requested the Activation Code. Email Noraxon’s customer service at info@noraxon.com or call 480-443-3413 (US/Canada customers may call 1-800-364-8985) with your Activation Key. The Activation Code you receive will only work for the computer with the Activation Key you gave Noraxon. Enter this code in the myoRESEARCH XP window and click “Activate”.

Where do I find the Activation Key?

Please refer to the following document for step-by-step instructions (MRXP version 1.07). ~~MRXP Activation Code Instructions ~~request-activation-code-instructions-v1.pdf~~

The Activation Code you gave me doesn't work.

Try the following suggestions:

1) Be sure to enter the “-“.

2) The letter “O” is not used in the key or code; only the number “0” (zero) is used.

3) Recheck the characters “B” and “8” since they look alike.

4) If you called Noraxon for the code, miscommunication may have happened. Try emailing the Activation Key to info@noraxon.com

Sensors
I have a sensor/device from another company. In the Channel Setup, the sensor/device is not listed. How do I add it?

You will need to add a new type to the “Auxiliary” channel setup. For detailed information, please refer to the document Create a New Auxiliary Type in MRXP

Signal Processing
I do not want to signal process all the available channels. How do I signal process only the desired channels in MRXP?

channel-by-number-80

The signal processing I applied to my data is incorrect. How do I change it?

First you will need to remove all the signal processing, then you can apply the desired signal processing operations. Please refer to the Remove Signal Processing video tutorial for step-by-step instructions.

Which values should I use for Smoothing in MRXP?

The ABC of EMG Manual (section Signal Processing – Smoothing, pg 28) recommends a RMS time duration value of 50-100ms. Higher values have a greater risk of a phase shift in contractions with steep signal increase. If you are performing Biofeedback measurements, a RMS time duration of 300ms is recommended.

What does "RMS" mean?

The RMS (Root Mean Square) is based on the square root calculation. The RMS reflects the mean power of the signal and is the preferred smoothing method. For more information, please refer to the ABC of EMG Manual section Signal Processing – Smoothing, pg 28

I want to use a Butterworth filter. How do I set it up in myoRESEARCH XP?

3butterworth-filter-80

I need to filter out "movement artifact" (slow baseline shifts). Which settings do I use in myoRESEARCH XP?

The movement artifact video demonstrates how to filter out “movement artifact” from your data.

4filter-move-artifact-80

TELEmyo 2400R G2
On my TELEmyo 2400R G2, I set the switch to USB (or Panel) mode, but it is still not showing the proper mode.

In order to activate the new mode, you will need to press the “Standby” button on the front of the receiver after switching to the new mode.

TELEmyo 2400T
Why is there an uneven flow of my data while recording in MRXP?

The uneven flow of data is usually caused by a busy WiFi channel. Please refer to the document Change RF Channels on TELEmyo 2400 G2 for detailed information.

The PCMCIA card you sent with my system does not fit into the slot on my PC.

Your PC may have an “Express” slot and not a “PCMCIA” slot. If you have a TeleMyo 2400T G2, we recommend using the PC Interface Receiver Otherwise, you may be able to use the Internal Wifi on your PC.

My TELEmyo 2400T G2 is not turning on.

1) You will need to wait at least 10 seconds for the transmitter to turn on because It takes approximately 10 seconds for the transmitter to complete the start-up sequence.

2) If you have a Wireless Sync Inline Receiver plugged into the “Sync” port on the transmitter, you will need to unplug the Wireless Sync Inline Receiver from the transmitter “Sync” port, then turn on the TeleMyo 2400T G2. Once the transmitter has turned on, then you can plug the Wireless Sync Inline Receiver into the “Sync” port on the transmitter.

My battery charger for my TM2400T G2 is not working.

If you are not seeing any lights on the Battery Charger, unplug the Power Supply from the wall outlet and the Battery Charger. Now, insert the Power Supply into the Battery Charger, then plug the Power Supply into the Wall Outlet.

How do I set up the TELEmyo 2400T (G1: models V1 & V2) network on Windows Vista?

The document Vista TM2400T G1 Network Instructions explains the procedure with step-by-step instructions.

USB Devices
I am getting the error message "Cannot open USB driver. Device can be unplugged or turned off."
I am using a myoTRACE 400 and I keep getting the error "USB cable is disconnected" in myoRESEARCH XP, but my USB cable is connected to the PC Interface and the PC.

This error is usually resolved by installing a patch. If you are using myoRESEARCH XP 1.06, you will need patch 1.06.78. If you are using 1.07, you will need patch 1.07.05. These patches are available on our software download page.

How do I load the USB driver?

The video tutorial (no audio) myoSYSTEM 1400A USB Driver Installation shows how to download and install the USB driver on the myoSYSTEM 1400A. The other Noraxon EMG USB systems follow a similar process. Video tutorials for the other Noraxon USB systems will be available soon.

I already loaded the USB driver on this PC, why isn't it working?

Windows requires the driver to be loaded on every USB port. Solution:

1) (preferred – fewer problems later) Load the Noraxon USB driver on all the computer’s USB ports. Now it doesn’t matter which USB port you use.

2) Label clearly which USB port has the Noraxon USB driver.

Section

1) Verify that the Noraxon EMG system is turned on.

2) Verify that all the cables are securely connected.

3) Verify that the USB driver is installed on the USB port you are using.

4) If you have an older Noraxon EMG system, the hardware may not be configured to power the USB connection. If you need additional assistance, please email Noraxon’s technical support at support@noraxon.com or call 480-443-3413 (US/Canada customers may call 1-800-364-8985)

Where is the USB driver on the website?

The USB Driver is located on the Drivers and Firmware Download webpage, then select your Noraxon EMG System. The Driver files for your system will be listed and available to download and install.

I downloaded the USB driver from the website, but I can't install it.

The USB driver is saved as a “zip” file: “nxnusb.zip”. After you download this file, click “Open”. This will open up Windows Explorer and display two files. In the upper left corner of the Window’s Explorer screen is the option “Extract All Files”. Select this option and save the file to a convenient location, e.g. Desktop. The Noraxon USB EMG System Setup video (no audio) shows how to install the USB driver for the myoSYSTEM 1400A. The other Noraxon EMG USB Systems follow a similar process.

Video
How do I set up the video in MRXP?

Please refer to the document How do I do that in MRXP

When I try to set up the video in MRXP, I get the Package Error "Device not found". How do I solve that problem?

1) Verify that your Video Camera Driver is installed on your PC.

2) Verify that your video camera is connected to your PC.

3) If you are using a USB connection, verify that your camera supports real-time video via USB. If your Video Camera has both a firewire and USB connection, sometimes the USB connection is for playback only – not real-time recording.

Section

“Codec” is an abbreviation for Compression/DECompression. A “Codec“ is software that converts the video from one format to another. A Codec typically compresses the data as part of the process. In MRXP, when you save a record with video, you will see the message “Compressing … % done”. This message indicates that the Codec software is compressing and converting your video data into another format.

Which Codec should I use for my videos?

For Versions 1.03, 1.04, 1.05, 1.06: We recommend using the DivX codec (version 5.1 or higher). You can download the DivX codec from www.divx.com MPEG4 also works well; however it may not be available on your computer. For Version 1.07: The codec MPEG4 was automatically installed on your PC when you installed MyoResearch XP. This is the codec we recommend using.

Which Audio Codec do I use?

You must use “PCM” for the Audio codec in order for the video and audio to work properly in MRXP.

I do not see the Demo videos in MRXP.

Versions 1.03, 1.04, 1.05, 1.06: You do not have the proper codec on your PC. You will need to download the DivX codec from www.divx.com There is a Pro (costs money) and a Free version – the free version will work with myoRESEARCH XP software. Only the DivX Codec is required – you do not need the DivX Player. The DivX codec version must be 5.1 or higher.

I do not see the video screen in MRXP when I am recording the data.

There are several possible reasons why you are not seeing a video screen in MRXP.

1) You may have missed a Setup step. There are two steps to setup the video in myoRESEARCH XP: a) Hardware Setup Menu Video Settings and b) “Enable Video” in the Measurement Setup screen. For more information, please refer to the document How do I do that in MRXP

2) You are using a Digital Camera with Video Capability. Most Digital Cameras do not allow you to record the video directly to the PC. They only allow you to record the video with the camera and then copy the video to the PC for playback only.

3) If your PC is configured to work with a digital projector, but both the digital projector and the PC are selected to display, the video image will only show on the digital projector.

My video screen in MRXP is black.

The most common reason is that the recommended Codec was not used for the Video and/or the Audio. In the Hardware Setup screen under the “Video Input” Settings check the following:

1) The Video Codec is set to DivX or MPEG 4.

2) If you do not want to record Audio, verify that the Audio option (which is on the same screen where you selected your Video camera) is not checked.

3) If you are recording Audio, the Audio Codec must be “PCM”. For more information, please refer to the document How do I do that in MRXP

Can I use a USB digital video camera?

We recommend using Firewire since it has been tested thoroughly. However, many customers have successfully used a USB digital video camera with myoRESEARCH XP. You will want to verify that your digital video camera can play real-time video via a USB connection.

Software
Vicon Nexus Plug-in

If Nexus 1.8.5 is installed with the Noraxon plugin; then installing Nexus 2.0 should not affect this plugin, it’s setting or operation. Nexus 2.0 is installed in a completely separate folder with a different folder structure to ensure it doesn’t interact or interfere with Nexus 1.x installations. Users might expect that the Noraxon plugin will just appear in Nexus 2.0 if it was installed for Nexus 1.x. This is not the case due to the separate folder / install pathways discussed above. For the plugin to work in Nexus 2.0 a separate plugin install was be performed while ensuring that the install pathway points to the Neuxs 2 folder and not the default, which is typically C:\Program Files (x86)\Vicon\Nexus (the Nexus 1.x default pathway).