The Yokogawa CL120 clamp meter user manual provides safety guidelines, operation steps, specifications and maintenance information.
This manual explains safe use of the CL120 clamp meter, including safety symbols, instrument layout, preparation before measurement, and detailed AC current measurement procedures. It also describes additional functions such as auto‑shutdown, data‑hold, and optional accessories like the 99025 clamp transformer.
Battery replacement, technical specifications, calibration recommendations and after‑sales service instructions are covered in later sections, ensuring users can maintain accuracy and safety throughout the instrument’s life. This manual is written in Chinese.
| AC current range 20 A | 0–19.99 A ±2.0 % rdg ±7 dgt (50–1 kHz) |
|---|---|
| AC current range 200 A | 0–199.9 A ±2.0 % rdg ±5 dgt (50/60 Hz) ±3.0 % rdg ±10 dgt (40 Hz–1 kHz) |
| Display | LCD, maximum count 1999 |
| Response time | ≈ 2 seconds |
| Sampling rate | ≈ 2.5 samples per second |
| Operating temperature | 0 °C – 40 °C, ≤ 85 % RH (no condensation) |
| Storage temperature | -10 °C – 50 °C, ≤ 75 % RH (no condensation) |
| Maximum conductor diameter | ≈ 24 mm |
| Battery type | Two LR44 or SR44 3 V DC cells |
| Battery life (continuous) | ≈ 100 hours |
| Auto‑shutdown interval | ≈ 10 minutes of inactivity |
| Insulation resistance | ≥ 10 MΩ at 1000 V |
| Physical dimensions | ≈ 59 mm × 147 mm × 26 mm (W × H × D) |
| Weight | ≈ 100 g (including battery) |
The CL120 must not be used on circuits higher than 300 V AC.
Calibration is recommended once per year.
It uses two LR44 or SR44 3 V DC batteries.
The instrument automatically powers off after about 10 minutes of inactivity.