Product Description
MN-447A 2ch Noise Meter
The MN-447A is intended for accurate determination of noise and signal levels in the audio range.
It is equipped with two identical measuring channels to permit simultaneous measurements of two input signals.
Measurements of noise voltages are possible with use of one of five weighting filters based on standards of DIN, CCIR and JIS.
Indicating systems are for quasi-peak, average and effective values to meet with requirements of the different standards.
For convenience in S/N measurements, a variable sensitivity control is provided for use in conjunction with the dB scales.
Further, a back-up function is provided.
FEATURES
- Five weighting filters included: DIN/AUDIO, DIN/NOISE, IEC, CCIR/ARM
- Indication modes in accordance with – At QUASI-PEAK, AVER., and R.M.S.
- Continuously adjustable gain control provided for 0 to approximately, -10dB range.
- Usable as a wideband high gain amplifier (approx. 100dB at maximum sensitivity) with AC and DC outputs
- Weighting filter at the CCIR/ARM setting enables testing of circuits, which include the Dolby noise reduction system.
- Two-pointer meter enables comparison of two input levels at the same time.
SPECIFICATIONS
| Input Frequency Range |
| 10Hz to 500kHz, without weighting filters |
| Voltmeter Range |
| 10µV to 300V, full scale, 16 range in 1, 3, 10 sequence |
| -100dB to +50dB, full scale (0dB=1Vrms) |
| -98 to +52dBm, full scale (0dBm=0.775Vrms) |
| Accuracy |
| AVER. |
±3% of full scale, except 10µV range. |
| QUASI-PEAK, R.M.S. |
±5% of full scale, except 10µV and 30µV ranges.
(Note: Not applicable at above 100V or 42dBm, or when using a weighting filter.) |
| Frequency Characteristic |
| AVER. |
| • 10µV range |
±5% : 20Hz to 20kHz
±7% : 10Hz to 30kHz
±15% : 30kHz to 50kHz |
| • 30µV, 100µV range |
±5% : 20Hz to 100kHz
±7% : 10Hz to 200kHz
±15% : 200kHz to 300kHz |
| • Above 300µV range |
±3% : 20Hz to 200kHz
±7% : 10Hz to 500kHz |
| QUASI-PEAK, R.M.S. |
| • 10µV range |
±10% : 20Hz to 20kHz
±15% : 10Hz to 30kHz |
| • Above 30µV range |
±10% : 10Hz to 50kHz |
| Indication and Scales |
| a) QUASI-PEAK |
For the quasi-peak value referred to the effective value of a sinusoidal voltage in accordance with DIN 45405 (1967), DIN 45405 (1978), CCIR (468-1) and CCIR (468-2). |
| b) AVER. |
Average value referred to the effective value of a sinusoidal voltage. |
| c) R.M.S. |
Effective value referred to the effective value of a sinusoidal voltage. (Waveform factor<2). |
| [Note] |
When the CCIR/ARM weighting filter is used, the AVERAGE value is indicated regardless of the INDICATION switch setting. |
| Weighing Filters |
| a) DIN/AUDIO |
Conforms to DIN 45405 (1967) for audio, 10Hz to 20kHz, measurements. |
| b) DIN/NOISE |
Conforms to DIN 45405 (1967) for noise voltage measurements. |
| c) IEC |
For noise voltage measurements in conformance with the following: JIS C1502A, JIS C5551A, IHF-A-202, IEC 179-A and NAB. |
| d) CCIR |
For noise voltage measurements in conformance with the following (ref. 0dB at 1kHz): CCIR (468-1), CCIR (468-2) and DIN 45405 (1978). |
| e) CCIR/ARM |
Conforms to the Dolby System noise voltage measurements (ref. 0dB at 2kHz). |
| Optional filters |
On order, any or all special types given below can be installed in place of the standard types:
(1) Band pass: 1kHz, 36dB
(2) Band pass: 1kHz, 60dB
(3) Band pass: 400Hz, 60dB
(4) IHF/T-200 |
| Adjustable Sensitivity Range |
| 0 to over -10dB. |
| Input Impedance |
| 1MΩ, approx. 30pF in shunt; unbalanced. |
| Maximum Input Voltage |
| 10µV to 30mV range |
AC: 10Vrms, DC: 450V |
| above 100mV range |
AC: 330Vrms, DC+AC peak |
| Output Voltage (At meter full scale and at open circuit) |
| AC |
1Vrms ±10% |
| DC |
1V ±10% |
| Output Frequency Response |
| AC |
10Hz to 500kHz ±5% into 600Ω termination. |
| DC |
10Hz to 500kHz ±5%. |
| Output Impedance |
| AC |
Approx. 600Ω, unbalanced. |
| DC |
Approx. 1kΩ, unbalanced. |
| Residual Noise |
| VER. , R.M.S. |
10µV Range : <1.5µV
30µV Range : <3.0µV |
| QUASI-PEAK |
10µV Range : <2.0µV
30µV Range : <4.0µV |
| Remote Control |
| Method |
Parallel method, positive logic, C MOS level; with photo-isolator
INDICATION 2-bit (common channel).
WEIGHTING 3-bit (common channel).
RANGE Switching 4-bit +4-bit (separate channels). |
| General |
| Power Requirements |
AC 100V, 115V, 215V or 230V ±10% (Voltage selector provided),50/60Hz; approx. 40VA. |
| Dimensions |
Approx. 150 (W)×225 (H)×395 (D) mm |
| Weight |
Approx. 7kg |
| Accessories |
Input cable : 2ea. |
| * |
Specifications are subject to change without notice. |
MN-447A 2 CH Noise Meter
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Product Description
MN-447A 2ch Noise Meter
The MN-447A is intended for accurate determination of noise and signal levels in the audio range.
It is equipped with two identical measuring channels to permit simultaneous measurements of two input signals.
Measurements of noise voltages are possible with use of one of five weighting filters based on standards of DIN, CCIR and JIS.
Indicating systems are for quasi-peak, average and effective values to meet with requirements of the different standards.
For convenience in S/N measurements, a variable sensitivity control is provided for use in conjunction with the dB scales.
Further, a back-up function is provided.
FEATURES
SPECIFICATIONS
(Note: Not applicable at above 100V or 42dBm, or when using a weighting filter.)
±7% : 10Hz to 30kHz
±15% : 30kHz to 50kHz
±7% : 10Hz to 200kHz
±15% : 200kHz to 300kHz
±7% : 10Hz to 500kHz
±15% : 10Hz to 30kHz
(1) Band pass: 1kHz, 36dB
(2) Band pass: 1kHz, 60dB
(3) Band pass: 400Hz, 60dB
(4) IHF/T-200
30µV Range : <3.0µV
30µV Range : <4.0µV
INDICATION 2-bit (common channel).
WEIGHTING 3-bit (common channel).
RANGE Switching 4-bit +4-bit (separate channels).
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