Production Devices- Located in El Cajon, CA. Mfg's P.C. Board Holders, Lead Forming Tools & Circuit Testers for Electronic Production, since 1965
Audible Circuit Probe
Model 105 $20.00
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.
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 resistances safe for semiconductors & CMOS logic (Probe current limted to 500 ua).
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 MAX- Frequency goes up with voltage, and in an AC modulated tone.
Same indications if connected this way
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.
"Reference Tone will be heard"
With leads reversed
Diodes- 1 to 3hz may be heard because of leakage
Rectifiers- Up to 20hz is acceptable of normal leakage
Transistor 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.
Our first priority is to please our customers with quality products and immediate delivery. If for any reason our products do not meet your quality expectations, we invite you to exchange the product or return it for a refund.
Production Devices has endorsed this policy since 1965.