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Model 105 Audible Circuit Probe
The Circuit Probe produces a tone that varies with resistance, capacitance, or voltage. May be used to check, continuity, compare circuit resistances, check capacitors, diodes or LED's, and trace audio signals (up to 1 KHz). Will test live circuits up to 130 VDC or AC (AC is modulated tone). Because the probe is current limited, it will not generate the high current surges normally produced by lamp and buzzer type testers. The probe will not harm any circuit. Sharp pointed tip on one end and a minigator clip on the other. Cable
length 36"
9 volt battery included.
Weight 4oz. Size 7" x 1.2" x .9"
Warranty- 1 year
Use to check:
- Continuity
- AC & DC Voltages
- Resistors to 1 meg ohm
- Capacitors to 3000 mfd
- Diodes & Transistors
- Compare Circuit Resistance
- Safe for semiconductors & CMOS logic (Probe current limited to 500 au).
Resistance
0 Resistance (probes shorted) = "Reference Tone"As resistance goes UP to 1 meg ohm, frequency goes DOWN to 10Hz.
DC & AC Voltage
DC RANGE- 0-130 volts max 0 volts - "Reference tone" to + 130 volts- Frequency goes UP with voltage to - 8 volts - Frequency goes DOWN with voltage AC Range- 0 to 130 volts msx Frequency goes up with voltage, and in an AC modulated tone.
Capacitor
Non- Polarized capacitors (ceramic, mylar, ect.)Less that .01 mfd. - No Tone.01 to .5 mfd. - one click.5 mfd to 3000mfd- tone changes from High Freq. down to 10hz.Polarized Capacitors (electrolytic & tantelum)
If leads are reversed, tone will only go down to "Ref. Tone" and possibly start back up.1. Before testing, short capacitor leads together to discharge.2. Ceramic capacitors may have buzzing sound depending on leakage.3. Capacitor is shorted if "Ref. Tone" is heard in both directions.
If leads are reversed, tone will only go down to "Ref. Tone" and possibly start back up.1. Before testing, short capacitor leads together to discharge.2. Ceramic capacitors may have buzzing sound depending on leakage.3. Capacitor is shorted if "Ref. Tone" is heard in both directions.
Diode-Zenner-LED-Rectifier
"Reference Tone will be heard"With leads reversedDiodes- 1 to 3hz may be heard because of leakageRectifiers- Up to 20hz is acceptable of normal leakage
TransistorsTransistor Good- When connected as shown, and a tone slightly lower than :"Ref. Tone" is heard.Transistor Open- No tone, when connected as shown.Transistors Shorted- If tone is heard when leads are reversed.
TransistorsTransistor Good- When connected as shown, and a tone slightly lower than :"Ref. Tone" is heard.Transistor Open- No tone, when connected as shown.Transistors Shorted- If tone is heard when leads are reversed.
TransistorsTransistor Good- When connected as shown, and a tone slightly lower than :"Ref. Tone" is heard.Transistor Open- No tone, when connected as shown.Transistors Shorted- If tone is heard when leads are reversed.