Billy Mayo
Member
Huntron Test Signal frequencys are 60hz, 400hz, 2000hz
What did they choose these 3 for test signal frequencys?
Huntron Ranges
Low Range = 10 volts peak
Mid Range#1 = 15 volts peak
Mid Range#2 = 20 volts peak
High Range = 30 volts peak
Open Circuit Signature- is a Horizontal Line
Short Signature- is a Vertical Line
Resistor Signature- is a Diagonal Line or a Rotated straight line
Diode Signature- is a "L" Shape
Defective Diode Signature- is an "L" shaped with "bending" caused by resistance
Good Capacitor Signature- is a Smooth Ellipse
Defective Capaitor Signature- Ellipse is Irregular shaped
Zener Diode Signature- is an "L" shaped and the breakdown voltage has "Sharp" corners
Defective Zener Diode Signature-
Is an "L" shaped , but the breakdown voltage has " Rounded" corners
Leakage Current Signature- Curvature or Rounded transistion point in the signature
Curvature means: Non-linear resistance
Huntron 2000 tracker , tracking down SHORTS
1.) Defective buss line: unsolder one pin at a time from the dective buss line until the signature is normal. ( My managers favorite one which takes days to do )
2.) Comparing Two Signatures of non bussed IC pins
3.) Leakage & HFE is temperature dependent, when using freeze spray or heater , you can monitor the signature on the buss line that shows the leakage. You then spray or heat component one by one until you see which component's signature changes "shape"
4.) Buss Short, VCC short, Ground Short or VCC to Ground short
a.) Medium#2 Range
b.) Check the Signatures for all the Non Bussed Pins
Circuit Leakage- mean leakage from Parallel Components when doing In-circuit testing
In Circuit Loading- means?
What is the name when there is an internal series resistor with a diode? the internal series resistor gets developed from what?
I know leakage is like a resistor in parallel with the diode, but what is a resistor in series ? it's not leakage it's what?
( Not a protection Diode, I know they have a internal series resistor but that is made like that )
Diode has an internal series resistor
a.) The series resistor effects the diodes to turn on at the proper voltage
b.) Non- Linear resistance in series
c.) What else?
Diode Leakage resistance: Internal Resistor in parallel with diode
a.) Non- Linear resistance in parallel
b.) This effects the ability of the diode to provide maxium output
c.) what else?
How can you Test the Diode Leakage Resistance with a DVM fluke 87 meter?
What did they choose these 3 for test signal frequencys?
Huntron Ranges
Low Range = 10 volts peak
Mid Range#1 = 15 volts peak
Mid Range#2 = 20 volts peak
High Range = 30 volts peak
Open Circuit Signature- is a Horizontal Line
Short Signature- is a Vertical Line
Resistor Signature- is a Diagonal Line or a Rotated straight line
Diode Signature- is a "L" Shape
Defective Diode Signature- is an "L" shaped with "bending" caused by resistance
Good Capacitor Signature- is a Smooth Ellipse
Defective Capaitor Signature- Ellipse is Irregular shaped
Zener Diode Signature- is an "L" shaped and the breakdown voltage has "Sharp" corners
Defective Zener Diode Signature-
Is an "L" shaped , but the breakdown voltage has " Rounded" corners
Leakage Current Signature- Curvature or Rounded transistion point in the signature
Curvature means: Non-linear resistance
Huntron 2000 tracker , tracking down SHORTS
1.) Defective buss line: unsolder one pin at a time from the dective buss line until the signature is normal. ( My managers favorite one which takes days to do )
2.) Comparing Two Signatures of non bussed IC pins
3.) Leakage & HFE is temperature dependent, when using freeze spray or heater , you can monitor the signature on the buss line that shows the leakage. You then spray or heat component one by one until you see which component's signature changes "shape"
4.) Buss Short, VCC short, Ground Short or VCC to Ground short
a.) Medium#2 Range
b.) Check the Signatures for all the Non Bussed Pins
Circuit Leakage- mean leakage from Parallel Components when doing In-circuit testing
In Circuit Loading- means?
What is the name when there is an internal series resistor with a diode? the internal series resistor gets developed from what?
I know leakage is like a resistor in parallel with the diode, but what is a resistor in series ? it's not leakage it's what?
( Not a protection Diode, I know they have a internal series resistor but that is made like that )
Diode has an internal series resistor
a.) The series resistor effects the diodes to turn on at the proper voltage
b.) Non- Linear resistance in series
c.) What else?
Diode Leakage resistance: Internal Resistor in parallel with diode
a.) Non- Linear resistance in parallel
b.) This effects the ability of the diode to provide maxium output
c.) what else?
How can you Test the Diode Leakage Resistance with a DVM fluke 87 meter?