Kewtech RB1 Voltage Indication Test Lamp

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technical info

Kewtech RB1 Voltage Indication Lamp

The Kewtech RB1 has been designed to replace pigmy filament bulbs in Drummond voltage detectors. As a Drummond lamp bulb replacement, the pigmy bulb indication works by using various intensities of brightness through a system of differing coloured LEDs to highlight the various voltage ratings.

This John Drummond replacement bulb has been designed for use in conjunction with a 2000 Ω resistor and a special high integrity resistor which is included with each RB1 bulb replacement. If you own a Drummond Test Lamp, then this is a valuable addition to your electrical test equipment.

To fit a new Kewtech RB1 Voltage Indication Test Lamp;

Remove the existing pigmy lamp from the tester by unscrewing the cap and removing the filament lamp
Replace with the RB1 LED bulb and screw firmly into position before replacing the cap
Replace the in series resistor by unscrewing the probe tip and withdrawing the fuse and resistor. Replace the standard internal resistor with the special 2000Ω version that comes with Kewtech RB1 Bulb.
Check that the fuse is 500mA F 600V rated before reassembling.

Voltage Levels for the Kewtech RB1 Voltage Indication Lamp

No of LEDs	Colour	Nominal Voltage	Result
1	White	50V 100V	The central white LED will start to light up above 35V and will steadily increase its brightness to 100V
3	Blue	230V	The array of blue LEDs will start to light around 190V
6	Red	400V	The array of red LEDs will start to light around 330V