KDCT-307 is an intelligent wireless tester for PT secondary voltage drop and load measurement featuring non-GPS synchronization for fast, terrain-independent operation. It eliminates long test cables, preventing short circuit hazards. The unit displays multiple parameters simultaneously on a true-color LCD, measures up to 32nd harmonics, and includes battery power for field use. With 200-test storage, built-in printer, and PC software, it delivers comprehensive PT circuit analysis.

1. Wireless automatic measurement for three-phase three-wire and four-wire PT secondary voltage drop without long test cables;
2. Non-GPS synchronization eliminates satellite searching for quick and convenient use;
3. Automatically calculate the ratio difference, angle difference, and comprehensive error of the three phases;
4. Automatically measure the load of the secondary circuit of voltage and current transformers;
5. Automatically detects and corrects measurement errors from test leads;
6. Software calibration function allows field accuracy adjustment without hardware modification;
7. Multi-parameter display: voltage, current, phase angle, power factor, active/reactive/apparent power with waveform display;
8. Harmonic measurement up to 32nd order for voltage and current;
9. Built-in fast-charging battery pack with over 6 hours continuous operation;
10. Battery remaining capacity percentage indication.
11. Large true-color LCD, automatic contrast/brightness adjustment for all seasons;
12. Built-in micro-printer for on-site result printing;
13. Stores up to 200 test records;
14. PC software for data upload and unified management.

Usage environment (2) Environmental temperature: -10 ℃~40 ℃ (2) Relative humidity: ≤ 80%
1. Measurement accuracy
The measurement accuracy of this instrument is level 1.
Differential ratio: Δ f=± (1% × f+1% × δ) ± 0.01 (%)
Angle difference: Δ δ=± (1% × δ+1% × f) ± 1 (min)
Conductivity: G=± (1% × G+1% × δ ± 0.01) mS
Dianna: δ=± (1% × δ+1% × G ± 0.01) mS
Load: S=± (1% × S ± 0.1) VA
Resistance: R=± (1% × R+1% × X ± 0.1) Ω
Reactance: X=± (1% × X+1% × R ± 0.1) Ω

2. Charging power supply: AC 176V~264V, frequency 45-55Hz

3. Measurement range and resolution of the instrument

Test project	Range	Minimum Resolution
Voltage measurement range (V)	40～120.000	0.001
Current measurement range (A)	0.005～6	0.0001
Difference value (%)	-10.000～10.000	0.001
Angle difference (ˊ)	-600～600.00	0.01
Error value (%)	-10.000～10.000	0.001
Revision (%)	-10.000～10.000	0.001