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Product description
NBM-550 is part of the NBM-500 instrument family. It delivers extremely accurate results for electromagnetic field strength measurements. NBM-550 handles applications from a few Hertz through to long wave and on up to high frequency microwave radiation using a selection of interchangeable probes for electric and magnetic fields.
The field strengths are captured with flat frequency response probes or probes with shaped frequency response, allowing the measurement values to be assessed against an environmental or occupational safety standard. The calibration factors for each probe are stored in the probe itself and are read out and taken into account automatically by the measuring set.
Frequency response weighted probes for convenient testing.
There are different personal safety limits at different frequencies. “Shaped probes” take care of the frequency issues for you, providing an easy-to-read display as a % of standard. You don’t have to deal with the actual field strength limits or frequencies, enabling quick and simple measurements even under complex ambient conditions. Narda Safety Test Solutions is the only supplier for shaped probes. Why? We hold the patent for this feature.
What is a shaped probe?
The traditionally-used flat frequency response probes have been developed with the aim of providing a probe having as constant sensitivity to magnetic field strength as possible over the usable frequency range. In contrast, Narda’s patented Shaped Probes are constructed in a completely different way. The sensitivity of these probes is designed to match a particular directive or standard. The sensitivity versus frequency (frequency response) of the probe is as closely as possible in inverse proportion to the limit value curve. The measured values are not displayed in V/m or W/m2, but are shown as “% of standard” instead. This makes it very easy to assess the results, particularly in multi-frequency environments as there is no need to worry about the predominant frequencies in the field. A result of less than 100% always means that the limit values are not exceeded anywhere within the entire frequency range of the probe. The “% of standard” display is referred to the power density of the electromagnetic field. The high bandwidth of 300 kHz to 50 GHz of a Narda “Shaped Probe” is unique.
What’s the reason for the extremely wide bandwidth of Narda’s shaped probes?
When compared with conventional broadband probes, Narda’s Shaped Probes have a much wider frequency range (e.g. 300 kHz – 50 GHz). The reason for this is the use of a diode-based probe section for the lower frequency range (approx. 300 kHz – 2 GHz) and a thermocouple probe section for the upper frequency range (approx. 300 MHz – 50 GHz). Both parts of the probe have suitable frequency responses which are superimposed after adjustment of the sensitivity and which correspond as closely as possible to the limit value curve of a particular safety standard (e.g. ICNIRP).
Although the transition region is continuous, Shaped Probes can be considered simply as diode probes below 1.5 GHz and as thermocouple probes above 1.5 GHz.
What’s the difference between thermocouple and diode-based probes?
Both types of probe use dipoles to detect the electric field. The dipoles in the thermocouple probes are formed by thermocouples connected in series, which generate a DC voltage proportional to the power density. In the diode-based probes, the dipoles are formed by two equal lengths of wire with a detector diode as rectifier between them. Both these techniques can be used to develop broadband sensors.
Комплектация
Ask your reseller for sets suitable for your application.
Сведения о реестре СИ
Номер в Госреестре |
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Номер в Госреестре |
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Изготовитель |
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NBM-550 | ||
DISPLAY | ||
Display type | Transflective LCD, monochrome | |
Display size | 10 cm (4“), 240 x 320 dots | |
Backlight | White LEDs, selectable illumination time (OFF, 5s, 10s, 30s, 60s, PERMANENT) | |
Refresh rate | 200 ms for bar graph and graphics, 400 ms for numerical results | |
Operating languages | English, French, German, Italian, Spanish, Simplified Chinese, Turkish, Russian | |
MEASUREMENT FUNCTIONS (with high frequency probes) | ||
Result units | mW/cm2, W/m2, V/m, A/m, % (of standard) | |
Display range | .0001 to 9999, 4 digits, variable or fixed triads can be selected | |
Variable triads 0.01 V/m to 100.0 kV/m 0.01 mA/m to 265.3 A/m 0.001 mW/m2 to 26.53 MW/m2 0.1 nW/cm2 to 2.653 kW/cm2 0.0001 % to 9999 % |
Fixed triads 0.01 to 9999 V/m 0.0001 to 265.3 A/m 0.0001 to 9999 W/m2 0.0001 to 9999 mW/cm2 0.0001 to 9999 % |
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Result types (RMS, isotropic) | Actual, Maximum, Minimum, Average, Average Maximum | |
Result types (RMS, X-Y-Z mode) | Actual X, Actual Y, Actual Z (requires a probe with separate axes) | |
Time averaging | Selectable averaging time, 4 s to 30 min (2 s steps) | |
Spatial averaging | Discrete or continuously | |
Multi-position spatial averaging | Averages up to 24 spatially averaged results, each position and total is stored | |
History Mode | Graphical display of Actual RMS results versus time (span of 2 minutes to 8 hours) | |
Correction frequency | 1 kHz to 100 GHz or OFF (direct frequency entry, interpolation between calibration points) | |
Hot Spot Search | Audible indication of increasing and decreasing field strength (result type Act or Max) | |
Alarm function | 2 kHz audible signal (4 Hz repetition), adjustable threshold | |
Timer Logging |
Start time pre-selection: Logging duration: Logging interval: |
up to 24 h or immediate start up to 100 h 1s to 6 min (in 11 steps) |
RESULT MEMORY | ||
Physical memory | 12 MB non-volatile flash memory for measurement results and voice comments | |
Storage capacity | Up to 5000 results (including instrument settings, time stamp and GPS data when available) | |
INTERFACES | ||
Remote control | Via USB or optical RS-232 interface (selectable) | |
- USB | Serial, full duplex, 460800 baud (virtual COM port), multi-pin connector | |
- Optical interface | Serial, full duplex, 115200 baud, no parity, 1 start and 1 stop bit | |
Earphone | 3.5 mm TRS, ≥ 16 ohms (mono), see accessories | |
External trigger (for result storage) |
Uses the multi-pin connector. Interface cable with BNC connector available as accessory Triggers when contacts short-circuited |
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External GPS receiver | Uses the multi-pin connector; GPS receiver with interface cable available as accessory | |
Probe interface |
Plug-and-play auto detection, compatible with all NBM series probes RMS integration time for measuring input approx. 270 ms Measurement sampling rate 5 Hz (5/ 50/ 60 Hz for remote operation) |
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OTHER FUNCTIONS | ||
Conditional Logging | ||
Logging conditions |
Selectable: - On upper threshold: Results stored when measurements exceed the adjustable threshold - Out of gap: Results stored when measurements are above the upper threshold or below the lower threshold |
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Logging range |
Selectable: - Store all (as long as the condition is true), sampling rate 5 Hz - Store first and last event (when the condition was true) |
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Voice Recorder | ||
Microphone | Built in microphone located at the top of the instrument near the Narda logo | |
Recording level | Fixed level, VU meter for level monitoring displayed when recording | |
Recording length | 30 s max. length per voice comment, 1 voice comment stored with relevant result | |
Recording format | 8-bit PCM mono, stored as WAV file (approx. 240 kbyte per 30 s) | |
Output | External earphone (adjustable output level) or via NBM-TS PC software | |
GPS Position Logging | With attached GPS receiver (GPS Kit available as accessory) | |
Receiver type | GPS Standard Positioning Service and Differential GPS (DGPS) capability using real-time WAAS/EGNOS correction | |
Displayed position data | Latitude (Lat) and longitude (Long), selectable units: DMS (degrees, minutes, seconds)/ MinDec (decimal minutes)/ DegDec (decimal degrees) | |
Geodetic system | WGS84/ NAD83 | |
Position accuracy | < 3 m (Differential GPS), <15 m (Standard GPS), high precision mode indicated on the NBM-550. Accuracy specified for 95 % probability | |
Update rate | 1 s | |
Receiver size/ weight | 61 mm diameter x 19.5 mm high / 62 g (approx. 100 g with mounting plate) | |
Receiver mounting | Uses the tripod thread on underside of device, mounting plate included | |
GENERAL SPECIFICATIONS | ||
Recommended calibration interval | 24 months (basic unit only, probes are specified separately) | |
Battery | NiMH rechargeable batteries, 4 x AA size (Mignon), 2700 mAh, included | |
Operation time | 20 hours (backlight off, no GPS) 12 hours (permanent backlight, no GPS) 10 hours (GPS receiver connected, no backlight) | |
Charging time | 2 hours | |
Battery level display | 100%, 80%, 60%, 40%, 20%, 10%, low level (< 5%) | |
Temperature range Operating Non-operating (transport) | -10 °C to +50 °C -30 °C to +70°C | |
Humidity | 5 to 95%, non condensing ≤29 g/m3 absolute humidity (IEC 60721-3-2 class 7K2) | |
Size (h x w x d) | 45 x 98 x 280 mm (without probe and GPS receiver) | |
Weight | 550 g (without probe and GPS receiver). | |
Accessories (included) | Hard case, power supply, rechargeable batteries, shoulder strap, tripod (bench top), NBM-TS software, operating manual, certificate of calibration, USB cable interface | |
Country of origin | Germany |