Metra Ford F 150 Truck 1999 - Page 4 - Answered Questions & Fixed issues
1 Answer
Re; Tecpel DMM 8007 Multimeter.
I can't help much - there is a downloadable manual on the Tecpel website but I don't know whether it covers calibration.
I am wondering why you need to calibrate it and what sort of accuracy you need?
Multimeters are usually reasonably accurate from the factory over a fairly narrow range of ambient temperatures, a pocket multimeter that is accurate enough for checking in the field rather than a serious test instrument. The reading tolerance on the capacitance range is 5% which is good considering the tolerances of some capacitors is ridiculous and the best of them is usually no better than 5%.
If you need your meter to be accurate it would be better to send it to the experts who will be able to do the job in a controlled temperature and humidity and use standard value capacitors. Sorry - didn't mean to go on, just interested...
Car Audio &...
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Answered
on Nov 13, 2020
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81 views
2 Answers
I need a wire harness diagram
If you could tell the brand and model number I might be able to
help. A picture of the receptacle at the back of the radio where
the plug goes in would help too. If you can't add a picture, then
a discription might be enough (number of pins, number of rows, etc.) .
Car Audio &...
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Answered
on Oct 30, 2020
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1,119 views
1 Answer
2003 nissan terrano 2 radio entry code process
Try this. Turn the ignition on, with the engine off. Turn on the radio. Press and hold button 4. The display should change. Use the Tuning buttons to enter the code. (I think its up/down to change the numbers). Enter the first number and press button 5 to confirm. Use the tuning buttons to move along to the next number, (i think it's left/right for this bit). Repeat the method for the first number, (Set number then press five to confirm). Once you enter the last digit the display should switch back to the normal display and be ready to use.
Car Audio &...
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Answered
on Oct 19, 2020
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20 views
1 Answer
IS THE DC VOLTAGE DETECTED ON SPEAKER TERMINALS ARE NORMAL? LIKE 24 VOLTS DC?
A loudspeaker doesn't usually have DC present on the terminals due to the very low impedance a high current can flow and destroy the speech coil. It would also hamper the correct operation of the loudspeaker.
Because of this the amplifier output is decoupled either by transformer or by capacitor, effectively blocking direct current while allowing the alternating current output of the amplifier to pass.
The thump sound in the speakers at switch on is caused by the decoupling capacitors charging due to the speaker providing a ground path.
Purely as a matter of interest, in the days of ancient radio, some speakers had no magnet which was replaced by an electromagnet through which the radio supply current would run after rectification and smoothing, the windings acting as a smoothing choke providing additional regulation. Such loudspeakers had four terminals, two of which did carry a powerful direct current and those confusing the terminals quickly saw smoke...
Car Audio &...
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Answered
on Jun 12, 2020
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63 views
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