ENERTECH Consultants - The EMF Experts
EMF Measurement, Research, Software, Instruments, Consulting

 

Enertech Consultants
494 Salmar Ave
Suite #200
Campbell, California 95008
USA
(408) 866-7266
FAX: (408) 866-7279

 

 

EMDEX
Frequently Asked Questions

 Calibrations

Q:

Do EMDEX meters come with calibration documents?

A:

All sales of our EMDEX instruments include calibration documents.

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Q:

How do I get my EMDEX meter calibrated?

A:

We recommend that you calibrate your meter once a year.  You do not need to get a manufacturer authorization number (RMA) from Enertech to send a meter in for calibration. To send your meter for calibration, do the following:

  1. Pack the meter carefully in a sturdy container. Include instructions stating that you would like the enclosed meter(s) calibrated and whom to contact if additional repairs are required or recommended.

  2. Ship the meter to:

Enertech Consultants

494 Salmar Avenue, Suite 200

Campbell, CA 95008 USA

Phone: (408) 866-7266 x.21

  1. Once we receive your meter, we will inspect it and contact you regarding any additional work we recommend (and the cost of that additional work). Once we will finalize your order, we will notify you of the total cost (including shipping charges).

  2. Acceptable Forms of Payment

  1. For international sales, we prefer payment through a wire transfer. Contact us by phone (010-1-408-866-7266 x21) or e-mail (etcsales@enertech.net) and we will provide transfer information upon confirmation of your request.
  2. Company check or purchase order.
  3. Credit card. Contact us at etcsales@enertech.net and we will e-mail a credit card form to you for completion.

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Meters and Specifications

Q:

How long will my EMDEX II meter collect data?

A:

The length of time the meter can collect data depends on

  • The amount of memory your meter has

  • The sample rate

  • The kind of data you are collecting

  • The life of the 9V battery.

The amount of memory your meter has is printed at the bottom of the battery compartment. If the meter has 512KB of memory, the data collection times based on the memory capacity of your meter are shown below. Data collection times will probably be shorter because sampling rates to as high as perhaps 3 weeks using a lithium battery with long sample rates).

 

Type of Data

Sample Rate

Collection Time based on amount of memory

Broadband Resultant

1.5 sec

71.1 hours

3

142.2 hours

5

9.9 days

10

19.7 days

15

29.6 days

30-300

59-592 days

Broadband Resultant, x, y, and z

1.5 sec

19.4 hours

3

38.8 hours

5

2.7 days

10

5.4 days

15

8.1 days

30-300

16-161 days

Broadband and Harmonic Resultant

3

85 hours

5

142.2 hours

10

11.8 days

30

35.5 days

300

355 days

Broadband and Harmonic Resultant, E-field

3

42.6 hours

5

71.1 hours

10

142.2 hours

30

17.8 days

300

178 days

Broadband and Harmonic Resultant, x, y, and z

3

19.4 hours

5

32.3 hours

10

2.7 days

15

4.0 days

30

8.0 days

300

81 days

 

If the meter has 128KB of memory, the data collection times based on the memory capacity of your meter are shown below. Data collection times may be shorter because of battery life (from as low as about 35 hours using an alkaline battery with fast sampling rates to as high as perhaps 3 weeks using a lithium battery with long sample rates).

 

Type of Data

Sample Rate

Collection Time based on amount of memory

Broadband Resultant

1.5 sec

21.6 hours

3

43.3 hours

5

3.0 days

10

6.0 days

15

9.0 days

30-300

18-180 days

Broadband Resultant, x, y, and z

1.5 sec

5.9 hours

3

11.8 hours

5

19.7 hours

10

1.6 days

15

2.5 days

30-300

4.9-49 days

Broadband and Harmonic Resultant

3

26.0 hours

5

43.3 hours

10

3.6 days

30

10.8 days

300

108 days

Broadband and Harmonic Resultant, E-field

3

13.0 hours

5

21.6 hours

10

43.3 hours

30

5.4 days

300

54.1 days

Broadband and Harmonic Resultant, x, y, and z

3

5.9 hours

5

9.8 hours

10

19.7 hours

15

29.5 hours

30

2.5 days

300

24 days

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Q:

How long will my EMDEX LITE meter collect data?

A:

The length of time the meter can collect data depends on

  • The amount of memory your meter has

  • The sample rate

  • The kind of data you are collecting

  • The life of the 9V battery.  The EMDEX LITE uses very little battery power so typically battery life isn’t a problem.

The amount of memory your meter has is printed at the bottom of the battery compartment.

 

 

Sample Rate

Memory size

Battery

128K

512K

Life

Type

4 sec

24.3 hours

4.04 days

6 days

Alkaline

10

2.53 days

10.08

6

Alkaline

30

7.58

30.33

27

Alkaline

1 min

15.2

60.67

30

Alkaline

2

30.3

121.33

60

Alkaline

5

75.8

303.38

120

Alkaline

10

152

606.79

200

Lithium

20

303

1213.6

400

Lithium

 

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Q:

How do I change the sample rate on my EMDEX LITE?

A:

Do the following to change the sample rate of the EMDEX LITE:

  1. Save any data from the EMDEX LITE that you want to keep.

  2. Connect the EMDEX LITE to your computer and start the EMCALC program.

  3. In EMCALC, click Communication > EMDEX LITE > Set Meter Parameters.

  4. In the warning message, click OK. Wait a moment for a diagnostic program to run.

  5. In the Set EMDEX LITE Parameters dialog box, for Display/Rate, select the desired LCD display option and sample rate and click OK. A progress bar will appear as the new parameters are uploaded to the LITE.

  6. In the EMCALC 2007 dialog box, click OK.

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Q:

How do I upload the LINDA program to an EMDEX II?

A:

To run the LINDA measuring wheel accessory with the EMDEX II, you need to upload the LINDA program into the meter (unless the LINDA program has been installed as the default program). You can tell which program you have by turning on the EMDEX II for a minute. If the display says “LINDA” , then the meter is already set to use the LINDA wheel accessory.

If the meter says “STANDBY”, do the following to load the LINDA program into the EMDEX II:

  1. In EMCALC, click Communication > EMDEX II > Upload Program.

  2. Connect the EMDEX II to your computer and turn on the meter.

  3. In the EMCALC dialog box, check the instructions and click OK.

  4. In the Upload EMDEX II Program dialog box, select LINDA and click OK. A progress bar will appear as the new program is uploaded to the EMDEX II.

  5. In the Successfully uploaded program to and EMDEX II meter dialog box, click OK. The EMDEX II should automatically restart and then display “LINDA”. DO NOT TURN OFF THE METER OR YOU WILL HAVE TO UPLOAD THE PROGRAM AGAIN.

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Q:

Are there any special handling instructions that I need to know concerning my EMDEX meter?

A:

As with all sensitive instrumentation, handle the meter carefully.  In particular:

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Q:

What frequencies does an EMDEX measure?

A:

All of our meters are calibrated to measure from 40-800 Hertz (Hz).

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Q:

What are the differences between the different EMDEX meters?

A:

All of our meters are high quality portable three-axis field meters which measure power frequency (40-800 Hz) magnetic fields. A comparison table is also available under our Instrumentation Sales menu tab.

The EMDEX SNAP, is a survey meter; it does not record or store its measurements in memory. Results can be read on its display.

The EMDEX MATE is similar to the SNAP except it stores a summary of each 10-minute interval of data it measures.  These statistical summaries can be displayed on its screen or downloaded to a computer.  The MATE summarizes each 10-minute interval in terms of the minimum and maximum readings, the mean, standard deviation, percentage of time in six exposure ranges, and the cumulative exposure.

The EMDEX LITE is a small, recording meter suitable for use in personal exposure measurements and long-term monitoring of the magnetic fields at a site.  Each measurement is stored in its memory and can be downloaded and analyzed using the EMCALC analysis software supplied with each LITE meter.  Depending on battery life and data sample rate, data can be collected or up to several months.

The EMDEX II can record a wide variety of EMF data, including electric fields (using the E-probe accessory), electric current (using the Amp-Logger accessory), or distance information (using the LINDA wheel accessory).  Each measurement is stored in its memory and can be downloaded and analyzed using the EMCALC analysis software supplied with each EMDEX II.

The EMDEX II housing provides more robust shielding against external interference than our other meters.

Depending on battery life and data sample rates, data can be collected for up to 2-3 weeks.

Using an EMDEX II, the user can also log ‘event markers’ during data collection to denote locations or activities of interest. This feature is extremely helpful for identifying different portions of the recorded data and confirming user information such as activity diary entries.

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Q:

How can I get a user manual for my meter?

A:

User manuals are available in several ways:

  • Your installation CD of EMCALC 2007 contains a Manuals folder containing PDFs of several user manuals. The installation directory for EMCALC 2007 on your computer also has a Manuals subdirectory.

  • The complete user manuals for the EMDEX II and EMDEX LITE meters are available in the EMCALC help file.  Open EMCALC 2007 and click Help > Contents. The EMDEX II user manual is found in Appendix D and the EMDEX LITE user manual is found in Appendix E.

  • To purchase a hard copy of any manual please call Enertech Consultants sales staff and support (408-866-7266) or e-mail us at etcsales@enertech.net.

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Measurements

Q:

Can I measure electric fields with an EMDEX meter?

A:

The EMDEX II meter has the capability to measure electric fields with an accessory probe – the EMDEX SNAP, MATE and LITE meters do not have this capability.

You can measure electric fields with an EMDEX II using the E-Probe accessory. The E-probe is designed to make “free-body” measurements of the electric field as described by the IEEE standards for power frequency EMF measurements. The E-Probe is an auxiliary sensor that you can order to use with the EMDEX II to measure electric fields.

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Q:

What special considerations do I need to know when taking EMF measurements using an EMDEX meter?

A:

When measuring EMF with your EMDEX meter:

  • Keep the meter away from metal objects which can disturb the nearby fields. Remove keys and other metal objects from your pocket.

  • Keep the meter away from radio-frequency (RF) sources such as cell phones and two-way radios which may interfere with the meter’s operation or cause incorrect readings.

  • Don’t make sudden movements with the meter while taking measurements.

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Q:

How do I take profiles and area surveys using an EMDEX meter?

A:

A profile is a linear measurement of the electric or magnetic field, usually along a straight line perpendicular to (or parallel with) a power line.

An area survey is a determination of the field levels in a specific area such as an office space or outdoor area.

Any EMDEX meter can be used to perform magnetic field profiles or area surveys by noting the location of the field measurement.  The LINear Data Acquisition (LINDA) wheel is an accessory to the EMDEX II that allows the meter to automatically record distances with the magnetic field data.

The EMCALC software included with the EMDEX II produces field versus distance and magnetic field contour maps from the LINDA data.

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Q:

How do I measure fields from my cell phone or microwave?

A:

Cellular phones, cellular towers, microwave ovens, two-way radios, and similar devices emit fields in the radio frequency (RF) band.  Enertech's meters are designed to measure power-frequency (50 or 60 Hz) or extremely-low-frequency (ELF) electric and magnetic fields, and cannot measure these higher frequency fields. An appropriate RF meter should be used to measure higher frequency fields (designed and designated for the frequency of interest).

Using ELF meters (such as EMDEX meters) close to RF sources such as an active cell phone can interfere with the meter’s operation or cause incorrect ELF readings.

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