There are cases where multiple channel signals (specified by frequency bands) are multiplexed to be transferred on a single transmission line of remote monitoring and control equipment, telemeters, etc.
When the signal levels of a specific channel are measured on such transmission lines using an ordinary flat level meter, signals on the other channels must be stopped.
However, LM-534B enables easy measurement of the signal levels of a specific channel without stopping signals on the other multiplexed channels.
Further, the signal-out function (signal output) enables the signal output from a specific channel, thereby allowing the monitoring of a specific channel for an extended period by concurrently using a level variation recorder.
This meter is equipped with a variety of filters with the following specifications: 50 baud (18-CH), 200 baud (8-CH), 300 baud (2-CH)，600 baud (3-CH)，1,200 baud (1-CH) and f0±50 Hz (f0: 200 Hz to 4 kHz: 50-Hz step).
It can measure the signal level of each multiplexed channel with a one-touch operation.
This product can measure a single frequency signal used for control signals, etc. with the use of the bandpass filter with the specification of f0±50 Hz (f0: 200 Hz to 4 kHz: 50-Hz step).
Switching its operation mode to a flat level meter allows the measurement of the total levels of all channels.
The auto sweep function is used to automatically measure the levels of all channels (CH) of each individual filter and store them in memory.
The peak hold function allows the recording of minimum and maximum values, which is useful for checking level fluctuations.
Setting the input impedance to HIGH allows the meter to be used for the measurement of lines on which a DC current is superimposed.
Measured data can be stored in multimedia cards (MMC) in CSV format, thereby allowing PCs, etc. to import the data for editing with spreadsheet software, etc.
It is a compact hand-held measuring instrument.
It can operate with dry batteries in addition to the attached AC adaptor.
Configuration example
Main Specifications
| Main Specifications | |||
| No. | Item | Specifications | |
| 1 | Environmental conditions | Guaranteed temperature/humidity performance | 0°C to 40°C/20 to 85% (Note: in an environment with no condensation) |
| Guaranteed temperature/humidity operation | Same as the guaranteed performance | ||
| 2 | Power supply condition | Battery | AA batteries × 4 |
| AC adaptor | The ACP-311M AC adaptor can be used with power conditions of 100 V AC±10% (50/60 Hz) | ||
| Built-in battery (backup purpose) | Approximately two days' worth of settings and time-of-day clock data are backed up by its supercapacitor | ||
| 3 | Product appearance | Dimensions/mass | Dimensions: H208 × W96 × D50 mm (The projection is not included)/Mass: 600 g or less (batteries not included) |
| 4 | Terminal | Measurement terminal | C2-11P |
| AC adaptor jack | For connecting the ACP-311M AC adaptor | ||
| 5 | Insulation | Between the AC adaptor's AC terminals and other individual terminals | 500 V DC/1,000 MΩ or higher |
| * A rechargeable battery (1.2-V output type) can be used | |||
| Standards | |||
| No. | Item | Specifications | |
| 1 | Level measurement unit | Terminal | C2-11P |
| Input impedance | Within 600 Ω±5% (balanced)/HIGH (50 kΩ or higher) | ||
| Measurement frequency range | 150 Hz to 10 kHz (in flat meter mode) | ||
| Level measurement range |
Level measurement: -70 dBm to +20 dBm (with a display indicating overflow/underflow) |
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| Resolution | 0.1dB | ||
| Measurement accuracy | Within ±1 dB | ||
| Maximum input level | +20dBm | ||
| 2 | Signal output unit | Output impedance | Within 600 Ω±5% (balanced) |
| Output frequency range | 200Hz～10kHz | ||
| Input and output level deviation | Within ±1.0 dB in a range of -50 dBm to +5 dBm | ||
| 3 | Frequency selective unit | 50 baud | Center frequency: f0 = 425 to 3,315 Hz (170-Hz step/18-CH) Pass-band width (BW): 100 Hz |
| 200 baud | Center frequency: f0 = 800 to 2,800 Hz (400-Hz step/6-CH) and f0 = 1,700 Hz, 2,100 Hz (2-CH) Pass band width (BW): 260 Hz |
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| 300 baud | Center frequency: f0 = 1,080 Hz, 1,750 Hz (2-CH) Pass-band width (BW): 260 Hz |
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| 600 baud | Center frequency: f0 = 1,200 Hz, 1,500 Hz, 2,400 Hz Pass-band width (BW): 460 Hz |
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| 1,200 baud | Center frequency: f0 = 1,700 Hz Pass-band width (BW): 1,000 Hz |
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| f0±50 Hz | Center frequency: f0 = 200 Hz to 4 kHz (50-Hz step/77 points) Pass-band width (BW): 100 Hz |
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