This capacitor discharge tool is a foldable pen for capacitors charged to no more than 1000V, built around a 1000V MOSFET, with a single discharge capacity of 1000uF. In the listing's test a fully charged 450V 470uF capacitor reaches LED off in about 8 seconds. The probes pivot on screw mounts from 1mm to 70mm apart, then fold back along the board: 115 x 16 mm open, 80 x 16 x 7 mm folded. It suits AC and DC capacitors and has no polarity.
Features and Benefits
- 1000V MOSFET - rated for discharge voltages up to 1000V, never above
- Pivoting probes, 1mm to 70mm spacing - close pitch and widely spaced terminals with one pen
- Folds to 80 x 16 x 7 mm - the probes tuck back along the board for storage
- Rectifier bridge - either probe can go on either terminal
- LED indicator - lit while discharging, out at about 8.5V, with cut-off at about 1.7V
- Screw mounted probes - welding nuts with anti-backout screws hold them in place
Applications
- Electrolytic capacitors on power boards after power-off
- Electronics production, testing and maintenance
- Boards with closely spaced or widely spaced capacitor terminals
Note: Disconnect the power first and do not touch the circuit or exposed metal during discharge. Keep each discharge under 15 seconds, and for capacitors over 1000uF let the MOSFET cool before discharging again. Around 6V can remain after the LED goes out, so confirm zero volts with a meter before handling.
Product type: Foldable capacitor discharge pen. Maximum discharge voltage: 1000V, set by the 1000V MOSFET, do not exceed. Single discharge capacity: 1000uF, cool before discharging larger capacitors again. Discharge speed: 450V 470uF fully charged to LED off in about 8s. Maximum single discharge time: 15 seconds. Indicator: LED on while discharging, off at about 8.5V. End-of-discharge voltage: About 1.7V. Polarity: Not polarity sensitive, rectifier bridge. Probe spacing: 1mm to 70mm. Unfolded size: 115 x 16 mm. Folded size: 80 x 16 x 7 mm. In the box: 1 x discharge pen. Probe mounting: Welding nuts with anti-backout screws, probes pivot and fold. Probe tips: Pointed tips on thick probe shafts. Construction: Clear sleeve over the circuit board, black board handle with a slotted loop. Capacitor types: AC and DC capacitors. Residual voltage: Around 6V can remain when the LED goes out. Duty: For large capacitors, let the MOSFET cool between discharges. Package contents: 1 x discharge pen. Q: How long does it take to discharge a capacitor with this pen? A: The listing's test takes a fully charged 450V 470uF capacitor to LED off in about 8 seconds. Keep any single discharge under 15 seconds and let the pen cool between runs on big capacitors.. Q: How do you discharge a high voltage capacitor with it? A: With the equipment powered off and disconnected, open the probes to the terminal spacing and hold them on both terminals until the LED goes out, then confirm zero volts with a meter. Do not use it above 1000V.. Q: Does it matter which way round the probes go? A: No. A rectifier bridge means the pen does not distinguish between positive and negative.. Q: How far apart can the probes go? A: From 1mm up to 70mm, because the probes pivot on screw mounts.. Q: Is the capacitor at zero volts when the LED goes out? A: Not quite. The LED goes out at about 8.5V and the listing warns that around 6V can remain, so check with a meter..