- Vintage equipment voltage measurement - 2 Updates
| "pfjw@aol.com" <peterwieck33@gmail.com>: Aug 20 09:50AM -0700 On Monday, August 20, 2018 at 10:21:20 AM UTC-4, John-Del wrote: > Just to add (and not referring directly to any measurements you may have made) that many discrepancies in measurements are the result of not following the service manual specifics regarding test conditions. A properly prepared SM will include the conditions of measurement - such as line voltage, warm up time, impedance of the meter, whether or not a signal is applied, setting of customer controls and service adjustments and placement of switches or functions selected. There are others I'm sure. Yep. Try aligning any of several multi-band radios without following the manual - and see how far you get. Peter Wieck Melrose Park, PA |
| Ralph Mowery <rmowery28146@earthlink.net>: Aug 20 01:56PM -0400 In article <073eaadd-5130-4d68-84ec-df3260d997b9@googlegroups.com>, peterwieck33@gmail.com says... > > Just to add (and not referring directly to any measurements you may have made) that many discrepancies in measurements are the result of not following the service manual specifics regarding test conditions. A properly prepared SM will include the conditions of measurement - such as line voltage, warm up time, impedance of the meter, whether or not a signal is applied, setting of customer controls and service adjustments and placement of switches or functions selected. There are others I'm sure. > Yep. Try aligning any of several multi-band radios without following the manual - and see how far you get. Sometimes the manual is wrong. I have an old Hammurlaund hq140 and one alignment step says hook a meter across the speaker and apply a unmodulated signal and tune for maximum. Only problem is it should be a modulated signal or there will not be any speaker output. Many times on the old equipment there is nothing more than a schematic and one just has to make the best guess. Reminds me of a fellow at work. He had a good memory and could go right through the calibration of many instruments. However if something went wrong he had no idea how to correct it and would have to call on others. My memory is not that good,so I had several notebooks with my steps on how to do the calibration. If something went wrong, it was usually easy for me to find the problem. Many times I have found out there are simple steps to take for repair that is not in manuals. Finding that,I have often written my own 'service manual'/ |
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