Multifunctional Level Meter
LM-322
This is a hand-held multifunctional level meter equipped with functions required for the testing and maintenance of voice-band transmission lines, transmission equipment, and communication devices.
Equipped with an ITU-T O.41 compliant psophometer characteristics filter, band-pass filter, and band-elimination filter, LM-322 can measure psophometric noise and crosstalk, and has further enhanced functions including extended recording of measured data on multimedia cards (MMC).
Equipment Category
Measuring instruments for transmission characteristics
Consisting of an oscillator, level meter, DC voltmeter, AC voltmeter, and ohmmeter, this hand-held meter is capable of high performance.
The measured values can be directly read through the digital display, and the peak hold function allows the retention of the maximum and minimum values.
Equipped with an ITU-T O.41 compliant psophometer characteristics filter, band-pass filter, and band-elimination filter, LM-322 can measure psophometric noise and crosstalk.
The single frequency measurement function allows the measurement of answer tones of facsimiles and modems.
The built-in speaker allows the monitoring of audio signals.
Capable of LM-322 to LM-322 calls through a 4-wire leased line.
Continuity can be checked through a buzzer sound.
Measured data can be recorded on multimedia cards (MMC) for an extended period, thereby allowing spreadsheet software etc. for PCs to import and edit (graph creation and report preparation) the data.
Configuration example
Main Specifications
| Standards | ||
| Item | Specifications | |
| Level meter | Input impedance | 600 Ω (balanced) (within 600 Ω±2%)/HIGH (50 kΩ) * within the measured frequency band |
| Measurement frequency range | 80Hz～25kHz | |
| Measurement level range | FLAT: -60 dBm to +10 dBm/Filter enabled mode: -70 dBm to +10 dBm (↑↓: key with a display indicating overflow/underflow)/Resolution: 0.1 dB | |
| Filter | ITU-T O.41 compliant psophometer characteristics filter Band-pass filter: f0: 800 Hz,1,000 Hz,1,020 Hz,1,500 Hz; Pass band: f0±10 Hz; In-band deviation: within f0±1.0 dB Stop band: f0±100 Hz; Stop band attenuation: 45 dB or higher Band-elimination filter: f0: 800 Hz,1,000 Hz,1,020 Hz,1,500 Hz; Pass band: f0±10 Hz; In-band deviation: within ±1.0 dB Stop band: f0±100 Hz; Stop band attenuation: 45 dB or higher |
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| Level measurement accuracy | 80 Hz to 300 Hz: within ±1.0 dB; 300 Hz to 4 kHz: within ±0.5 dB; 4 kHz to 25 kHz: within ±1.0 dB | |
| Absolute maximum input level | +20dBm | |
| Frequency counter | 80 Hz to 25 kHz/Display resolution: 1 Hz/Counting error: within ±2 Hz (when counting the cycles in a sine wave) | |
| Others | In the HIGH-Z mode, it can be connected to a general subscriber line. | |
| Oscillator | Output impedance | 600 Ω (balanced) (within 600 Ω±10%) * within the output frequency band |
| Output frequency | 200 Hz to 25 kHz; MANUAL: Setting resolution: 10 Hz STEP1：0.3/0.6/0.8/1.0/1.3/1.5/1.8/2.0/2.5/3.0/3.4 kHz STEP2：0.2/0.3/0.4/0.6/0.8/1.0/1.5/2.4/3.0/3.4/3.5 kHz |
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| Output level | -50 dBm to +5 dBm/Setting resolution: 1 dB | |
| Output frequency accuracy | Within ±0.01% | |
| Output level accuracy |
200 Hz to 300 Hz: within ±0.5 dB; 300 Hz to 4 kHz: within ±0.2 dB; 4 kHz to 10 kHz: within ±0.3 dB |
|
| Signal purity | Overall distortion factor: 40 dB or higher (300 Hz to 3.4 kHz/under 0 dBm output power) Distorted waves: 4 kHz to 8 kHz: p-30 dB or lower; 8 kHz to 12 kHz: p-50 dB or lower 12 kHz to 50 kHz (in each 4-kHz band): p-60 dB or lower; ＊ p: 1 kHz/0 dBm |
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| DC voltmeter | Measurement voltage range | 0 to ±300V (↑↓: key with a display indicating overflow/underflow)/ Resolution: 0.000 V to ±9.999 V: 0.001 V; ±10.00 V to ±29.99 V: 0.01 V; ±30.0 V to ±300.0 V: 0.1 V |
| Measurement accuracy | Within ±(0.5% rdg±2 dgt) | |
| Input resistance | 5 MΩ or higher | |
| Absolute maximum applied voltage | 500 V (DC/AC) | |
| AC voltmeter | Measurement voltage range | 0 to 300 V/(↑: key with a display indicating overflow)/Display resolution: 1 V |
| Measurement accuracy | Within ±(2% rdg±2 dgt) | |
| Input resistance | 5 MΩ or higher | |
| Absolute maximum applied voltage | 500 V (DC/AC) | |
| Ohmmeter | Resistance measurement range | 0 to 3MΩ/(↑: key with a display indicating overflow)/resolution：0Ω～999Ω、1.000kΩ～3.299kΩ：1Ω 3.30kΩ～32.99kΩ：10Ω 33.0kΩ～332.9kΩ：100Ω 330kΩ～999kΩ、1.000MΩ～3.000MΩ：1kΩ |
| Measurement accuracy | Within ±(2% rdg±2 dgt) | |
| Absolute maximum applied voltage | 450 V (DC/AC) | |
| Continuity check | Buzzer sounds at a resistance below 200 Ω | |
| Peak hold function | After the function is turned ON, the maximum and minimum values of the displayed values are retained. | |
| Single frequency measurement function | Set frequency range: 300 Hz to 24 kHz/Setting resolution: 10 Hz; Detected frequency range: set frequency±50 Hz; Measurement error: ±5 Hz Detection time: continuously for 1,500 msec or longer |
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| Call function | Capable of making calls through a 4-wire leased line. | |
| Monitor speaker | Capable of monitoring input signals (AGC with a volume switch) | |
| Data storing function | Capable of storing measured data | |
| Power supply | AA batteries × 4/The AC adaptor (ACP-311M) can be used | |
| Guaranteed temperature/humidity performance | Temperature: 0°C to 40°C/ Humidity: 20% to 85% (Note: in an environment with no condensation) | |
| Dimensions/mass | Dimensions: D90 × H32 × W195 mm (The projection is not included)/Mass: 500 g or less (batteries not included) | |
