Another than was brought up today was that i noticed 2.0 ohm resistors only on 4 channels out of 10 channels
It's like an audio mixer that has the same circuit just multiple channels
The output transformer has 10 isolated outputs, 25 volts per isolated output with it's own ground per isolated channel
Some of the circuits that get hooked up to the isolated output has 2.0 ohm resistors before it goes to the +VCC circuit where the other circuits are direct nothing in between the isolated transformer isolated output direct to the +Vcc to the circuit
All the circuits are identical, the only difference is that some have a 2.0 ohm resistor inbetween the isolated power supply going to the circuit
My manager said that the 2.0 ohm resistor make it high impedance for the power supply , which keeps it isolated more from the power supply
2.0 ohm resistor is high impedance? i don't get it
CHOP vs ALT: Older analog scopes when they did dual trace, ALT means that CH1 is swept and then channel 2. Used for high sweep speeds. In CHOP, a little piece of each channel is displayed alternately.
87: True about 5 khz max. A meter to read high frequency AC: **broken link removed**
Try duty cycle, then. I didnlt check the specs.
2 ohm resistors: I think there may be better explanations: 1) It helps isolate capacitive loads or 2) It gives some wiggle room. The output can't follow exactly, so it's better to drop some voltage across a resistor.
Seems like the highest is 5Khz for measure AC voltage
Any reason why they want the power supply to be at a very high frequency?
How would a Troubleshooting tech know if zero volts is an open component or a short component?
Cause a short to ground can cause components to measure zero volts, but so can an open component cause components to measure zero volts
So how would a troubleshooting rule out its an OPEN component? because of why
What is it called when a diode is not open or shorted , but measures a voltage like .175 volts in reverse or forward biased? it's not called a short or an open, its called what?
What is it called when a component is shorted or open in a network , stage or circuit that causes other components around it has altered it's voltage or/& resistance for there normal values when taking measurements?
I see this a lot when I'm troubleshooting, when a component is shorted or open it alters the resistance values of resistors, capacitors values, voltages, but what is the name of this?
What is it called when a diode is not open or shorted , but measures a voltage like .175 volts in reverse or forward biased? it's not called a short or an open, its called what?
Normal or leaky. Shockkey diodes will have a low voltage drop. So will germanium diodes.
the OP said:
What is it called when a component is shorted or open in a network , stage or circuit that causes other components around it has altered it's voltage or/& resistance for there normal values when taking measurements?
I see this a lot when I'm troubleshooting, when a component is shorted or open it alters the resistance values of resistors, capacitors values, voltages, but what is the name of this?
1. "You missed a component" - when a component is shorted or open in a network.
2. Resistor changed value for a resistor that did. No name for a short changing the value of another element. You might get away with "Shunt" or "Open"
No, it's not normal because it's a zener diode , normal is .7 volts, this bad diode had .175 volts tested reverse biased and forward biased, it's not shorted or open its called something?
Any other point in the circuit. e.g. 0V across R1. Then 15 V across R1a to ground and 15 V across R1b to ground.
the OP said:
No, it's not normal because it's a zener diode , normal is .7 volts, this bad diode had .175 volts tested reverse biased and forward biased, it's not shorted or open its called something?
No, it's not normal because it's a zener diode , normal is .7 volts, this bad diode had .175 volts tested reverse biased and forward biased, it's not shorted or open its called something?
Shorted or very leaky.
Also, what is this called when you get these types of "In circuit" measurements? it this circuit impedance's?
When A component is shorted or open, it changes the "in circuit" measurements, what is it changing? the "in circuit" resistances change but is this called impedance?
If a circuit is fluctuating voltage, how do you know which transistor or IC chip is fluctuating the voltage up and down or at random?
How would a troubleshooting tech, test and pin which transistor or IC that is cause this kind of problem?
What is this called when a transistor or IC is fluctuating the voltage? the transistor is not shorted or open , so what is this called? or what state is the transistor or IC chip in when it's fluctuating either it's input or output?
Using Freeze or a Heat gun on the transistor won't help troubleshoot this problem, I have tried that
some filter caps , filter out the ripple frequency and other filter caps storage the power supply voltage
I'm not sure how to tell the different between a filter cap that filters out the ripple frequency VS filter caps that store the power supply voltage, how can you tell?
if a transistor internally is causing fluctuating, what internally is wrong with the transistor? and what kind of state is the transistor in when it's fluctuating on the collectors output?
The Transistor is Partially Intermittent I guess you can say
1.) The transistor is either fluctuating voltage AC or DC at the repetitive pattern
2.) The transistor is fluctuating voltage either AC or DC at a random pattern
You should take apart a TO-3 transistor like a 2N3055. Take a good and a bad one apart. You might learn something.
You can squeeze the top off with a vise at the edge.
I'd guess that a wire bond broke loose.
the OP said:
n DVM diode mode, but its measuring 0.175 in DVM diode mode in both direction
A shorted diode means the continuity is 0.2 ohms , it's like a bare wire
Open Diode, measures OL , overload on the DVM meter
When the diode has its junctions broken and it is at .175 volts it's not a short or open its called something
some filter caps , filter out the ripple frequency and other filter caps storage the power supply voltage
I'm not sure how to tell the different between a filter cap that filters out the ripple frequency VS filter caps that store the power supply voltage, how can you tell?
Man, do you even maths? 6:1 is steping the voltage down by a FACTOR of 6. That is, 150 to 25 is the same as 6 is to 1.
That means, a 6:1 transformer puts 1/6 of the input voltage on the output. So you put in 150V and get out 25V, or you put in 1V and get out 0.1667V.
Really, have you ever had like fractions and stuff at school? 6:1 means just that, 6 volts on input, one volt on output; or 24V input 4V output; or 1V input 0.1666V output. Or 6 gazillion volts input one gazillion volt output.
6:1 is the same thing as 1:1/6
6:2 is tha same as 3:1. You are free to call it anything you want as long as the ratio is the same.
6:3 is the same as 2:1 or 100:50. ditto