KZ35 Capacitor Discharge Pen – Precision Electrical Tester & Electronic Load Tool
The KZ35 is a small, handheld electronic load designed for diagnosing power supplies, safely discharging capacitors, verifying fast-charging protocols, and performing unattended aging tests. With intelligent protections, precise measurements, and a built-in temperature-controlled fan, the KZ35 provides professional-grade reliability in a portable form factor.
What the KZ35 Does
- Safely discharges capacitors
- Detects live circuits and verifies power supply performance
- Tests chargers with automatic fast-charge protocol triggering
- Measures current, voltage, power, capacity (Ah), and discharge time
- Performs long-duration aging tests with auto-stop protections
- Supports QC2.0, QC3.0, AFC, FCP fast-charge modes
- Offers full electronic-load features with adjustable current
Electrical Specifications
Operational Ranges
- Voltage: DC 4.0-25.0 V (with reverse polarity protection)
- Current: 0.03-5.00 A (0.22 A tuning current when fan starts)
- Maximum Power: 35W
Fast-Charge Trigger Support
- QC2.0: 5V/9V/12V/20V
- QC3.0: adjustable in 0.2 V steps
- Samsung AFC 9V
- Huawei FCP
- Supports auto-detection of charger protocols
Measurement Accuracy
- Current Accuracy: ±(1% + 3 digits)
- Voltage Accuracy: ±(0.5% + 3 digits)
Cooling & Heat Management
- Intelligent hydraulic-bearing cooling fan
- Fan Speed: 8000 ± 10% RPM
- Heat Dissipation: Smart fan + all-aluminum heatsink
- Fan auto-starts at:
- Load power > 10 W
- Temperature > 40°C
Built-In Protections
All protections show clear warnings on the LCD:
| Protection | Default Value | User Adjustable |
| OVP - Over-Voltage | 25.2V | Yes |
| OCP - Over-Current | 5.10A | Yes |
| OPP- Over-Power | 35.5W | Yes |
| LVP – Under-Voltage | 4.0V | Yes |
| OTP – Over-Temperature | ~80°C | No |
Reverse polarity is fully protected (no damage).
Operating Conditions & Physical Data
- Working Temperature: -20°C to +40°C
- Ports: Micro USB & USB Type-C
- Weight: ~66 g
- Size: 101 × 45 × 26 mm
Application
Designed for:
- Factory batch aging tests
- Charger and power supply verification
- Battery discharge analysis
- Electronics troubleshooting
- QC/AFC/FCP fast-charge testing
Full Electronic Load Feature Breakdown
Core Load Functions- Displays A, V, W, Ah, and time
- Full protection system with alarm indicators
- Automatic statistics for:
- Discharge capacity (Ah)
- Discharge time
- Adjustable current in 0.01 A increments
- Current-lock function prevents accidental changes
- Manual or auto-resume operation after protection events
- Selectable data-group mode for multi-stage tests
- Reverse-connection protection: device does not burn
- On protection events, LCD flashes:
- OVP/OCP/OPP/OTP/LVP
- LVP is especially useful for battery testing to prevent over-discharge
- Remembers previous switch state
- Automatically restores last used mode
- Counting begins when load is turned on
- Ends when load disconnects
- Used for battery capacity testing and power-supply analysis
- OAH: Set maximum discharge capacity
- OHP: Set maximum discharge time
- When limits are reached:
- Load stops
- LCD flashes OAH or OHP
- Statistics reset after clearing
- Perfect for unattended testing
- DAT0: Does not accumulate results across stages
- DAT1: Automatically accumulates capacity & time
Ideal for multi-round testing.
- REC ON: Automatically resumes after protection clears
- REC OFF: Requires manual restart
Great for preventing unintended load reactivation.
- AUTO ON: Fast-charge is triggered immediately at power-on
- AUTO OFF: No fast-charge trigger on power-up
Designed for batch charger testing in factories.
Fast-Charge Trigger / Decoy System
Supported Protocols- QC2.0
- QC3.0
- Samsung AFC 9V
- Huawei FCP
- Long-press TRG
- Device detects and displays supported fast-charge modes
- LCD cycles through "2. 3. A. F" (QC2.0 / QC3.0 / AFC / FCP)
- Short-press TRG to enter protocol selection
- Rotate the encoder to choose protocol:
- QC2.0: Select 5.0V/9.0V/12.0V/20.0V
- QC3.0: Voltage adjustable in 0.2V steps
- AFC/FCP: Automatically returns to load interface after triggering
- During trigger mode, the load automatically shuts off for safety.
User Interface & Controls
Operation Interface
- Short press ON/OFF: enable/disable load
- Rotate encoder: adjust current
- Short press encoder: cycle displayed parameters
- Long press ON/OFF on current screen: enable/disable data lock
- Long press ON/OFF on capacity or time screen: clear statistics
Settings Interface
- Enter by long-pressing encoder
- Rotate to adjust values
- Short-press encoder to switch fields
- Long-press ON/OFF on OAH to change capacity range
- Long-press encoder to save and exit
Summary
The KZ35 Capacitor Discharge Pen is far more than a simple discharge tool—it's a precision electronic load, fast-charging tester, and diagnostic instrument in one small device.
Whether you're testing chargers, aging power supplies, evaluating batteries, or performing shop-floor diagnostics, the KZ35 delivers accuracy, safety, and automation in a rugged pocket-sized unit.
