Page 275 - Electromechanical Devices and Components Illustrated Sourcebook

Chapter 13 Meters 237

Probe
Neon
Lamp

Alligator Clip Plastic 120 VAC
Housing
Test Lead
120-volt Lamp
120
Banana Plug 1.5-volt Lamp
Test 240-volt Lamp
Lead
240
Banana
Binding Post
Insulating
Base Probes
Screw Base "D" Size Battery
Battery Holder 120 VAC
LEDs 240 VAC
Figure 13-47 Bench Built Continuity Tester
Single GROUND
FAULT
Voltage

Probe AC Receptacle

Alligator Clip Dual
Voltage
Test Lead Figure 13-49 Power Indicators

In days gone by, technicians often used what they referred
to as a service light. This device is simple a rubberized screw
"D" Size Battery
base with a 40-watt incandescent light bulb. The socket is
equipped with a cage to protect the bulb and the base is wired
Battery Holder to two probes. Figure 13-50 shows a typical, bench built, ser-
1.5-volt Buzzer vice light.
Figure 13-48 Bench Built Continuity Tester with Buzzer

40-watt Type A Light Bulb
Protective
Figure 13-48 shows a continuity tester made from a battery Cage
holder and audible buzzer. Instead of relying on a visual indi-
Rubber
cator, the buzzer alerts the technician of continuity. Service Socket

Power Indicators
Splices
Power indicators are very inexpensive and quite handy to
have in your pocket or toolbox. These devices allow a techni-
cian to quickly determine whether or not a circuit has power. Lead Wires
Figure 13-49 shows three common commercial power indica- Probes
tors, a single voltage unit, a dual voltage unit, and dual volt-
age unit with a ground fault indicator. Figure 13-50 Bench Built Power Indicator or Service Light