Personal ECG Monitor ChoicecMMed MD100 Support - MD100A12, MD100E

Home ECG Monitor MD100A12

Product Related Documents

Quick Operation Guide (PDF)

Operational Manual (PDF)

MD100E Operation Manual in PDF format

Keep-It-Easy System User Manual (PDF)

Understanding heart rhythm - If you want to reap the full benefit of a home ECG monitor, get some basic knowledge on what ECG is and find out what your "normal ECG" looks like. You can get a better understanding of what is going on. It does not take a rocket scientist to do so.

Frequently Asked Questions

What are the tricks to get a good reading with the hand electrodes? The key is to have a good and steady contact between your hands and the electrodes. I discover that the following procedure would help:

  1. Sit down and relax for about a minute.
  2. Rest both hands on a table.
  3. Position your hands at the electrodes on the ECG monitor. Relax you fingers and hands. Press your hands firmly and gently together against the two electrodes.
  4. Your hands must not move or shake. Tense up your hand would also add noise to the result.
  5. Start a reading.

It may take you a few trials to get the hang of it.

What can I do with the ECG readings? A lot. You can send the data to your doctor for evaluation and monitor your own progress anytime anywhere. See How to use a personal ECG monitor for more details.

How do I download data to a Windows PC? To save the data, install the software that came with your device. If you run into connection problem, see CP210x connection issues for more details. See MD100 data download for a detailed description of the download procedure.

How do I archive data in the SD card to a computer? Follow the following steps to archive the data in the SD card:

  • Power on your MD100E ECG monitor and make sure the SD card is in the ECG monitor.
  • Connect it to the computer using the USB data cable provided.
  • Start the software.
  • Select "ECG strip view" >> "ECG record management" >> "Import."
  • Set "File type" to "SD Card File (ECGDATA.dat)."
  • Click "OK" to start import.

Part of the screen or icons are missing. If you are using large font sizes, sometimes only part of the window is displayed. To get around this problem, right click on "Keep-it-Easy ECG System" icon and select Properties >> Shortcut >> Run >> Maximized. The program will take over the entire screen and all buttons and icons will appear.

How to delete data stored in MD100 From "Main Menu" >> "Data Management", select "Erase All Data."

Is my MD100 enabled for arrhythmia analysis? The devices we sold all have the arrhythmia analysis enabled and no additional registration is required. In the "version" screen of the device (not the software), you should see the word "registered"; if not, send us your order number plus all the information shown in the "version" screen and we will obtain the registration code for you.

Do I need ECG electrodes? MD100 will work without the electrodes. However, if you want measurements that last longer than 30 seconds, the electrodes would help to give you better contacts and better signals. Furthermore the electrodes are normally placed closer to your heart and also give stronger signals.

What are the vertical and horizontal axis of the graph? The vertical axis is in milli-volts and the horizontal axis is in milliseconds. Each small square corresponds to 40 msec and 0.1 mV, which follows the standard convention. If the heart rate is at 60 beats per second, each ECG cycle would occupy 5 large blocks or 25 small blocks.

How many channels can MD100 measures? One at a time.

The signal is too weak. This may be caused by dry skin or bad contact between the electrodes and the body. Try to wet the body with some conductive gel or tap water (with some salt added) before taking a measurement.

Why sometimes the waveform is unstable? If the contact between the electrodes and your hands is not steady, this would cause the resistance (as seen by the ECG monitor) to vary and the signal to fluctuate. The contact must be firm and steady to get a good reading.

Make sure the connector is plugged all the way in. See below for comment on tight USB socket.

The USB socket is so tight that I have problem plugging the cable in. Since electrical signals generated from a heart is weak, good connection is essential. The manufacturer purposely make the socket tight. In some cases, the socket is way too tight and excessive force is required to push the plug in. Based on our experience, the socket always loosens up after 2-3 insertions.

The first picture to the right shows what the plug looks like when fully inserted and the second picture shows a loose connection.

The computer does not recognize the device. See CP210x connection issues for more details.

Can I use MD100 as a 12-lead ECG machine? MD100 can only measure one lead (channel) at a time; however you can take 12 measurements by placing the electrodes at different locations on the body. This way you can get a full picture of your heart's electrical activities. See Poor man's 12-lead ECG machine for more details.

Can I take my ECG at other positions besides those indicated in the manual? Yes. If you use the electrodes at different locations, you would get a different picture (angle) of your heart's activities. If you want to show the result to another person, tell him the positions of the electrodes also; otherwise he would have problem understanding the result.

Can MD100 show atrial fibrillation (AF or A-fib)? A-fib occurs if fast and disorganized signals causes the heart upper chambers (atria) to contract rapidly and irregularly. The P wave is normally replaced by unorganized random electrical signals. MD100A is capable of showing the P wave and therefore would capture any irregular signals (unless they are too weak).

Position the electrodes between right hand and left leg (LED II), which would give a better picture of the P wave.

The following diagram shows the difference between a-fib and normal ECG waveforms. In the top diagram, the P wave is replaced by some random ripples, which is an indication of a-fib.

atrial fibrillation

How do I print the report? From the main window, select Easy Data Replay >> Data Replay >> Pick the record you wanted >> Print. If you encounter problem printing the report to your printer, print it to the Microsoft XPS Document Writer or a PDF printer first and then to your printer. Different PDF printers produce different results. For example, CutePDF produces better diagrams than Adobe PDF printer.

There are many free PDF printer available on the internet. Go to any search engine and enter "PDF printer" to find out what is available.

With the latest release of the software, Keep-It-Easy does not print to the Microsoft XPS Document Writer anymore; however PDF printer still works.

Can I email the result to my doctor? You would need to save the data to your computer using the software provided. Print the report to a file (e.g. Microsoft XPS document writer or PDF printer), which can then be emailed to anyone. I have tried using the Adobe PDF printer and the result is not as good as using the Microsoft XPS document writer, which comes with Windows.

Is my software (version 1.x) the latest? For whatever reason, the manufacturer has decided to go from version 3.7.3 to version 1.0.0.

I have an error message related to UserDA.txt. The file is probably corrupted. Find the file and replace the file with an empty one. You can use Notepad to save an empty file to the same location.