User manual for Shuangjie JJ-BC series electronic balances covering operation, calibration, data output and troubleshooting.
The JJ-BC series electronic balances, manufactured by Shuangjie, use industrial‑grade magnetic balance sensors, a dedicated microcontroller system and RS232 communication for high‑precision weighing. The manual describes the balance’s features, specifications, installation steps and safe usage.
Key functions include automatic calibration, tare, unit conversion among seven units, data output via RS232 for printer or computer connection, and a counting mode for batch weighing. The document also provides wiring details, parameter settings, common fault diagnostics and warranty information. This manual is written in Chinese.
| Maximum weighing capacity | 120 g – 1520 g (model dependent) |
|---|---|
| Calibration weight | 100 g – 1000 g (model dependent) |
| Scale pan size | Φ80 mm – Φ120 mm |
| Power supply | AC 220 V ±10 % 50 Hz/60 Hz |
| Communication interface | RS232 (standard DB9) |
| Dimensions (W×L×H) | 220 mm × 360 mm × 345 mm |
| Operating temperature | 15 °C – 30 °C |
| Operating humidity | 40 % – 80 % RH |
Press the “TARE” key; the display will return to zero, allowing you to weigh only the net weight of the sample.
After the balance has warmed up for at least one hour, press the “CAL” key, place the supplied calibration weight on the pan, and the display will show the weight value, completing the automatic calibration.
Use the standard RS232 data output port; set the baud rate (default 600 bps) and connect the balance to the computer’s serial port or a USB‑to‑RS232 adapter.