The NT751 electric energy meter calibration instrument manual provides specifications, operation, and software instructions for accurate meter testing.
The manual introduces the NT751, a fully digital electric energy meter calibration device with a fiber‑optic Ethernet interface that outputs IEC 61850‑9 compliant current and voltage data. It explains the instrument’s hardware features, such as LCD display, USB programming interface, RS485 communication, and passive pulse inputs.
Technical parameters, wiring diagrams, switch settings, and detailed software operation procedures are covered. The appendix contains IEC 61850‑9 interface standards and protocol examples. The document is intended for technicians performing calibration and accuracy verification of digital energy meters. This manual is written in Chinese.
| Power supply voltage | 220 V AC / 220 V DC |
|---|---|
| Operating temperature | -10 °C ~ 55 °C |
| Storage temperature | -25 °C ~ +85 °C |
| Relative humidity | 0 % ~ 95 % non‑condensing |
| Fiber‑optic type | 1270 ~ 1380 nm multimode |
| Interface connector | ST connector (IEC 874‑10) |
| Pulse input method | Passive contact input |
The device operates from –10 °C up to 55 °C.
Set the baud rate to 9600, data bits to 8, stop bits to 1, and no parity.
It uses an ST connector for the multimode fiber link.