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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Use of Square Wave Generator on DMM
My meter has a 2V peak 30 to 40 Hz square wave generator and I am
wondering how I can use it in troubleshooting. What can I test in-circuit? How? Anything to watch out for, things I should not do? |
#2
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Use of Square Wave Generator on DMM
"Jamie" t wrote in message ... wrote: My meter has a 2V peak 30 to 40 Hz square wave generator and I am wondering how I can use it in troubleshooting. What can I test in-circuit? How? Anything to watch out for, things I should not do? maybe that is part of a 4..20 ma output option to calibrate devices? HOw did you come up with the 4-20 ma loop option ? Most 20 ma loops are setup to use about a 24 volt supply. Some of them will have a 250 ohm resistor in them to convert the 4-20 ma to a 1 to 5 volt signal for the readout device. This takes atleast 5 volts. The loops usually work on DC. I have used some test equipment that will ramp up in steps of 25% but it is much slower than 30 hz. Maybe every .5 to 1 second. I have used some VOMs that have a miliamp driver built in. Fluke makes one. I am sure there are applications that require that 2 volt square wave signal, but I have not seen any. What else does the meter do ? |
#4
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Use of Square Wave Generator on DMM
Ralph Mowery wrote:
"Jamie" t wrote in message ... wrote: My meter has a 2V peak 30 to 40 Hz square wave generator and I am wondering how I can use it in troubleshooting. What can I test in-circuit? How? Anything to watch out for, things I should not do? maybe that is part of a 4..20 ma output option to calibrate devices? HOw did you come up with the 4-20 ma loop option ? Most 20 ma loops are setup to use about a 24 volt supply. Some of them will have a 250 ohm resistor in them to convert the 4-20 ma to a 1 to 5 volt signal for the readout device. This takes atleast 5 volts. The loops usually work on DC. I have used some test equipment that will ramp up in steps of 25% but it is much slower than 30 hz. Maybe every .5 to 1 second. I have used some VOMs that have a miliamp driver built in. Fluke makes one. I am sure there are applications that require that 2 volt square wave signal, but I have not seen any. What else does the meter do ? because my meter has a pulse generator as a signal along with a 4..20 output to be used in calibrating current controlled devices. its used to supply a signal into the control device or to actually pulse the "ma" output line to pulse the actuator it self. its programmable. also, my meter uses a 9 volt source but has a DC-DC converter to generate 24 volts for the current source with scale able current out and monitoring. i don't know the meter that is in use, only going by my experience and suggesting what it could be. -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
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