NewTrend · panel-mounted electrical measurement
Product overview
The D48-2058 is a compact six-function AC panel instrument. Its colour LCD displays voltage, current, active power, accumulated energy, frequency and power factor together. The AC50–300V version uses an external current transformer for current indication up to 99.99A and installs through a nominal 22mm panel hole.
Technical selection summary
| Model | D48-2058 |
|---|---|
| Measured quantities | AC voltage, AC current, active power, energy, frequency and power factor |
| Voltage range | AC 50.0–300.0 V |
| Current range | AC 0.00–99.99 A using external CT |
| Current display resolution | 0.01 A below 100 A; display changes to 100.0 A above that threshold |
| Frequency range | 45.00–65.00 Hz |
| Power-factor range | 0.00–1.00 PF |
| Active-power display range | 0–30000 W |
| Power display resolution | 0.1 W through 9999.9 W; 1 W at higher readings |
| Energy display range | 0–99999 kWh |
| Energy display resolution | 0.01 kWh below 1000 kWh; 0.1 kWh from 1000.0–9999.9 kWh |
| Measurement accuracy | 1% ±2 digits |
| Update rate | 2 readings per second |
| Front / total dimensions | 49 × 47 × 53 mm |
| Panel mounting hole | Nominal 22 mm; rear cylinder shown as 21.5 mm |
| Depth sections — drawing | 15 mm + 10 mm + 28 mm |
| Memory | Accumulated energy saved automatically on power-off |
| Reset | Press and hold the reset button for five seconds |
Six measurements on one display
The high-definition colour LCD provides separate fields for W, kWh, V, Hz, A and PF. The instrument updates twice per second. Its power display changes resolution as readings increase, while the energy counter accumulates consumption and saves the current total when power is switched off. After the next power-on, counting continues from the saved value.
External CT and voltage connections
Connect the two-wire CT plug to the current-transformer input on the rear of the meter. Pass one conductor of the measured circuit through the CT aperture. Connect the measured AC voltage to the two voltage-input terminals according to the rear markings, then energise the correctly wired circuit.
Isolate the installation before connecting or disconnecting the voltage terminals or CT. Keep the measured voltage within AC50–300V and the current within the matching CT range.
Panel mounting and dimensions
The front is 49mm wide and 47mm high. The depth drawing divides the 53mm total into 15mm, 10mm and 28mm sections. The rear mounting cylinder is shown as 21.5mm diameter; use the specified nominal 22mm panel hole and secure the threaded retaining ring. Leave access for the CT plug and voltage terminals.
Energy memory and reset
Accumulated energy is stored automatically when the meter loses power and continues accumulating after power returns. To clear the energy counter, press the small reset button at the lower-right of the meter for five seconds using a suitable non-damaging tool.
Typical applications
- Voltage, current and energy indication in equipment panels.
- Building and machinery supply monitoring.
- Local power-factor and frequency indication for AC circuits.
