The HZGL-III digital power meter is a high-precision instrument designed for comprehensive electrical measurement. It supports both single-phase measurement for individual input units and advanced Σ (summation) functions for wiring groups composed of multiple input units.
| Function | Indicator | Meaning | Σ Function |
|---|---|---|---|
| U | V | AC Voltage | √ |
| I | A | AC Current | √ |
| P | w | Active Power | √ |
| S | VA | Apparent Power | √ |
| Q | var | Reactive Power | √ |
| λ | PF | Power Factor | √ |
| Φ | ° | Phase Difference | √ |
| fU | VHz | Voltage Frequency | N/A |
| fI | AHz | Current Power | N/A |
| Time | Time | Integral Time | × |
| WP | Wh | Sum of Watt-hours | √ |
| WP± | Wh± | Positive/Negative Wh | √ |
