NewTrend · panel-mounted electrical measurement
Product overview
The PZEM-051 is a four-function DC panel meter that displays voltage, current, power and accumulated energy simultaneously on a blue-backlit LCD. Its operating and measuring voltage is DC6.5–100V. Current measurement uses a matching external 50A/75mV or 100A/75mV shunt, selected in the instrument settings.
Technical selection summary
| Model | PZEM-051 |
|---|---|
| Measured quantities | DC voltage, current, power and accumulated energy |
| Operating / measuring voltage | DC 6.5–100 V |
| Current configurations | 0–50 A with 50 A / 75 mV shunt; 0–100 A with 100 A / 75 mV shunt |
| Power display range | 0–10 kW; respect the selected voltage and shunt ratings |
| Energy display range | 0–9999 kWh |
| Measurement accuracy | Class 1.0 |
| Voltage alarm setting | 6.5–99.9 V upper and lower thresholds |
| Alarm indication | Flashing backlight and voltage display |
| Memory | Energy data and backlight state retained after power-off |
| Energy reset | Front-button CLr confirmation |
| Current-range selection | Front-button Curr setting, 50 A or 100 A |
| Front dimensions | 89.6 × 49.6 mm |
| Body dimensions | 84.6 × 44.6 mm |
| Depth | 24.4 mm |
| Installation | Panel mounting; indoor use |
Display and stored readings
The LCD shows all four quantities together. Below 1kW the power display uses 0.0–999.9W; from 1kW it displays whole watts up to 9999W. Energy is shown in Wh below 10kWh and in kWh above that level. The voltage field displays 6.50–99.99V and the current field displays 0.00–99.99A. Accumulated energy is retained when power is removed.
Shunt selection and DC wiring
Select a 50A/75mV or 100A/75mV shunt to match the current range. Hold the front button until Curr appears, release it, then short-press to switch between 50A and 100A. Hold the button to exit, or leave it untouched for three seconds to save. The illustrated wiring example uses a 100A/75mV shunt.
Follow the rear wiring diagram for the separate voltage and shunt-sensing leads. Observe DC polarity and connect the shunt in the indicated current path. The load must remain within both the meter voltage range and the selected shunt rating. Isolate the circuit before wiring; incorrect connection order can damage the instrument.
Backlight, energy reset and voltage alarm
Short-press the button to toggle the backlight; its state is saved automatically. To reset accumulated energy, hold the button until CLr appears, then release it. While the energy value flashes, short-press again to confirm. If no key is pressed for five seconds, the meter exits without clearing the data.
To set the voltage alarm, hold the button until SET appears, then release it. The voltage and current fields show the upper and lower alarm values. Short-press to increment the flashing digit; after more than three seconds without a press, the setting position advances. Set the thresholds within 6.5–99.9V. Hold the button until PASS appears to save and exit. The alarm uses flashing backlight and voltage indications.
Dimensions and mounting
The drawing shows a front flange of 89.6×49.6mm, a body of 84.6×44.6mm and a depth of 24.4mm. Install the meter in a suitable indoor panel and allow access to the rear terminals and shunt leads.
Typical applications
- DC battery and low-voltage power monitoring.
- Bench supplies and DC equipment panels.
- Monitoring DC load power and accumulated energy within the rated range.
