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Narda ELT-400 Exposure Level Tester
Features:
- Direct evaluation of field exposure in
comparison to major standards
- Automatic exposure evaluation for
various waveforms
- Eliminates the overestimation occurring
occasionally with FFT-based evaluation
- Ultra wide frequency range (1 Hz to 400
kHz)
- Wide measurement range (up to 80 mT,
type-depending)
- Isotropic 100 cm2-probe (complies with
standards)
- Three-axis analogue signal output
Applications:
The Narda ELT-400 is an innovative exposure
level meter for measuring magnetic fields in the workplace and in public
spaces. The model is designed for health and safety professionals in
industry, the insurance business and the service industry. The instrument
can handle practically any level measurement requested in the low and
medium-frequency range, simply and precisely. It is comparable to the
sound level meters that are commonly used in the assessment of noise at
the workplace.
Production Area The Narda ELT-400 is
useful with diverse machinery used in manufacturing. This includes
induction heating, melting and hardening equipment. Also - thanks to the
extremely low frequency limit and high power capability - most magnetic
stirrers can be measured. Special demands often occur with machinery in
production areas where non-sinusoidal signals are common, e.g. in
industrial applications that use resistance welding machinery (pulse
waveform, phase angle control) with traditional 50/60 Hz systems as well
as in newer medium-frequency switching units.
General Environment In public
spaces, complex fields occur with several kinds of electronic article
surveillance systems. Most of the electromagnetic and acustomagnetic gates
are operated in the frequency range of the Narda ELT-400.
EMC Test House Magnetic fields
generated by household appliances or other electrical devices are
receiving increased attention. Some new standards such as EN 50366
describe how to investigate such products. The Narda ELT-400 is the ideal
measuring device when it comes to compliance with these standards.
Benefits include the perfectly matched frequency range and implementation
of the specified transfer function. The aim of this new generation Narda
ELT-400 is to greatly simplify the assessment process. With the EXPOSURE
STD (Shaped Time Domain) mode, the instrument achieves a new standard in
simple but reliable measurement of magnetic fields, whether
straightforward or in very complex field environments. Time-consuming and
easily misinterpreted measurements with a spectrum analyzer or a scope are
rendered obsolete. Detailed knowledge about the evaluation procedure or
the field waveform or frequency is no longer needed. The results are
reliable, and speed and ease of use are significantly improved over all
traditional methods.
| Specifications |
| |
Magnetic
(B-) Field |
| Sensor
System |
Coil
(100 cm2) |
| Measurement
Axis |
Tri-Axial (isotrop) |
| EXPOSURE
STD MODE |
| Frequency
Range (-3dB), selectable |
1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz to 400 kHz |
| Exposure
Evaluation |
Compared to Standard |
| MODE |
ICNIRP |
BGV B11 |
EN 50366 |
| RANGE |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
| Overload
Limit |
160% |
1.600% |
160% |
1.600% |
160% |
1.600% |
| Nominal
Range |
10% |
100% |
10% |
100% |
10% |
100% |
| Noise
Level, approximate |
1.3% |
6% |
0.4% |
6% |
0.4% |
6% |
| Damage
Level RMS (Peak) |
160 mT (226 mT) |
| Resolution
(RANGE: LOW) |
0.001 % |
| Detection,
selectable |
Automatic according to selected Standard or RMS
(averaging time 1 s) or Peak Value |
| FIELD
STRENGTH
MODE |
| Frequency
Range (-3dB), selectable |
1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz bis 400 kHz |
| Frequency
Response |
Flat |
| MODE |
320 µT |
8 mT |
80 mT |
| RANGE |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
| Overload
Limit |
32 µT |
320 µT |
800 µT |
8 mT |
8 mT |
80 mT |
| Nominal
Range |
2 µT |
20 µT |
50 µT |
500 µT |
500 µT |
5 mT |
| Noise
Level, approximate |
70 nT |
320 nT |
1.8 µT |
8 µT |
18 µT |
80 µT |
| Damage
Level RMS (Peak) |
160 mT (226 mT) |
| Resolution
(RANGE: LOW) |
1 nT |
| Overall
Uncertainty |
±4 % (50 Hz to 120 kHz) |
| Detection,
selectable |
RMS (averaging time 1 s) or Peak Value |
| Display
Mode, selectable |
Instantaneous or Max Hold |
| OUTPUT |
| Analog
Scope Output |
Three Channel (X-Y-Z) |
| Output
Level |
50
mV rms at scale final value of Nominal Range (Impedance: 50 Ohm,
nominal) |
| Interface (Remote
Control and Readout) |
RS-232
(19200 baud, 8n1, XON/XOFF), 3-Wire, Stereo Jack 2.5 mm |
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