Page 285 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

Test procedures

Components Test Results
Transformer
1 Remove wire leads.

2 Measure resistance. (ohm meter scale: Rx1)
• Primary winding
• Secondary winding
• Filament winding
3 Measure resistance. (ohm meter scale: Rx1000)
• Primary winding to ground

• Filament winding to ground

Approx. 0.3 to 0.5 ohms

Approx. 65 to 120 ohms
0 ohm

Normal: Infinite
Normal: Infinite
Magnetron 1 Remove wire leads. Install the magnetron seal in the
correct position. Check that the seal is in good condition.
2 Measure resistance. (ohm meter scale: Rx1)
• Filament terminal
3 Measure resistance. (ohm meter scale: Rx1000)
• Filament to chassis

Normal: Less than 1 ohm

Normal: Infinite
Capacitor 1 Remove wire leads.
2 Measure resistance. (ohm meter scale: Rx1000)

• Terminal to terminal Normal
Momentarily Infinite
and then soon reach 10
mega. ohms
• Terminal to case Normal: Infinite.

268

CITS : Power - Electrician & Wireman - Exercise 103