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Products Infomation
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- RION Measuring Amplifier NA-42
For a wide range of high-precision acoustic measurements.
The NA-42 is a sound level measuring amplifi er covering a wide frequency range and level range.
For general acoustic measurements and for environmental measurements, selectable frequency weightings (A, C, and FLAT) and time weightings (FAST, SLOW, IMPULSE) are provided. Other measurement modes allow determining maximum values for sound level, as well as peak sound level.
Measurement result readout resolution can be switched to one or two decimal points, and the large LCD panel shows setting information as well.
The choice of outputs includes AC, DC, serial interface, as well as a comparator output, making the unit suitable for use in a wide range of measurement and monitoring applications.
Measuring Amplifier
Model:
NA-42
Maker:
RION CO.,LTD.
Features
- Supports connection of several microphones useable: UC-53A, UC-52, UC-34P, UC-29, UC-27, UC-31 with suitable preamplifiers and cables.
- Frequency weighting: A, C, FLAT
- Time weighting: F (Fast), S (Slow), I (Impulse)
- Frequency range: 1 Hz to 100 kHz (main unit characteristics)
Specifications
| NA-42 | ||
| Standard | The electrical characteristics correspond to JIS C 1509-1 class 1 and IEC 61672-1 class 1 regarding “frequency weightings (A, C)” and “time weightings (Fast : F, Slow : S)”. | |
| Measurement functions | Sound pressure level, sound level maximum, peak sound pressure level | |
| Input section | Preamplifier input connector | |
| Preamplifier power supply: ±12 V or ±45 V (switchable) | ||
| Microphone bias voltage: 30/60/200 V | ||
| Frequency range | 1 Hz to 100 kHz (NA-42 only) | |
| Frequency weighting characteristics | A, C, FLAT | |
| Measurement level range | Dependent on microphone combination | |
| Residual noise level | 〃 | |
| Residual noise level (NA-42 only, without microphone and preamplifier) |
A weighting: 1.5 μVrms or less | |
| C weighting: 1.5 μVrms or less | ||
| Flat characteristics: 7 μVrms or less | ||
| Flat (HPF 20 Hz, LPF 20 kHz): 2.5 μVrms or less | ||
| Time weighting characteristics | F (Fast), S (Slow), I (Impulse) | |
| RMS detection | By digital processing | |
| Built-in filters | High-pass filter (HPF): 3rd-order Butterworth filter, 20 Hz | |
| Low-pass filter (LPF): 3rd-order Butterworth filter, 20 kHz | ||
| Calibration | Electrical calibration using 1 kHz sine wave signal produced by internal oscillator | |
| Microphone sensitivity setting range | -69.99 dB to -10.00 dB (0.01 dB steps) | |
| Outputs | AC output (BNC connector) |
1 Vrms full-scale |
| Output impedance 600 Ω, load impedance 10 kΩ or more | ||
| DC output (BNC connector) |
6 V (1 V/10 dB) full-scale | |
| Output impedance 50 Ω load impedance 10 kΩ or more | ||
| External filter input/output | BNC connector | |
| Output impedance 600 Ω, input impedance 100 kΩ | ||
| Interface | Serial communication (for setting control from computer and data output) | |
| D-sub 9-pin male connector | ||
| Comparator function | Sound pressure level evaluating comparator (M3 screw terminal block) | |
| Display | LCD | Numeric readout to 2 decimal points or 1 decimal point (switchable) |
| Bar graph | Scale range 50 dB or 20 dB (switchable) | |
| Other features | Various setting indicators, backlight | |
| Power requirements | IEC R14 (size “C”) batteries x 4, or AC adapter (NC-98C, supplied) | |
| Battery life | Alkaline batteries (LR14) approx. 14 hours | |
| Manganese batteries (R14P) approx. 6 hours | ||
| Ambient conditions for use | -10 ℃ to +50 ℃ (10 % to 90 % relative humidity) | |
| Dimensions and weight | 171 (H) x 120 (W) x 236 (D) mm, 1.8 kg (without batteries) | |
| Supplied accessories | AC adapter (NC-98C) x 1, storage case x 1, IEC R14 (size “C”) batteries x 4 | |
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