The AOB19 series digital frequency meter is a new generation of programmable intelligent frequency meter, which is mainly used for real-time measurement and indication of frequency in electrical circuits, and for remote transmission of measured electrical quantity data through RS485 interface or analog quantity conversion output interface. It has the characteristics of high measurement accuracy, good stability, long-term work without adjustment, and can set parameters on-site by panel buttons.
The AOB19 series digital frequency table is designed for high‑accuracy frequency measurement in railway and other industrial applications. It offers RS‑485 Modbus‑RTU communication, multiple analog output options, and built‑in alarm functions for upper and lower limits.
The manual covers mechanical dimensions, mounting procedures, terminal connections, power requirements, and step‑by‑step operation, including setting parameters, using the panel indicators, and configuring communication registers. Safety precautions and pre‑use checks are also provided. This manual is written in Chinese.
| Measurement range | 30.00‑99.99 Hz |
|---|---|
| Accuracy | ±0.1 Hz |
| Display resolution | 0.01 Hz |
| Sampling rate | 3 samples/s |
| Input signal type | AC or DC |
| Input voltage | AC 10‑500 V |
| Power consumption | < 1 VA |
| Supply voltage | AC/DC 85‑264 V 50/60 Hz |
| Auxiliary power consumption | < 3 VA |
| Analog output options | 0‑10 mA, 0‑20 mA, 4‑20 mA |
| Communication interface | RS‑485 Modbus‑RTU |
| Operating temperature | -10 °C to 50 °C |
| Operating humidity | up to 85 % RH |
It measures frequencies from 30.00 Hz to 99.99 Hz.
It can be powered from an AC or DC source of 85‑264 V at 50/60 Hz, with a consumption of less than 1 VA.
The device uses an RS‑485 interface with Modbus‑RTU protocol.
The table provides up to three output ports: OUT, ALM and AUX.