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stewart warner speedometer ratio adapter
For stewart warner speedometer ratio adapter needs to check:
1. The output voltage can be directly seen with the DC gear of the oscilloscope.
2. The output current is related to the load. Generally, the adapter will be marked, so it is not necessary to measure. If you don't know the load, you can string a small resistance with sufficient power on the negative end circuit of the power supply, measure the voltage with an oscilloscope after carrying the load, and then calculate the current value.
3. Measuring ripple is the most meaningful.
There are several key points:
A. The oscilloscope enables the bandwidth limitation function, which limits the bandwidth to about 20m
B. AC coupling
C. Connect a 10u capacitor and a 0.1U capacitor in parallel at the position to be measured.
D. Remove the probe jacket of the oscilloscope and lean against the positive and negative ends of the position to be measured as short as possible.
E. The amplitude gear of the oscilloscope should be at mv level, and the time gear should be adjusted from 10ms to see the ripple and noise of different frequency bands. The main ripple is generally concentrated at the power frequency and the switching frequency of the switch tube.
What is ratio adapter:
Automobile speed ratio refers to the automobile transmission ratio, which refers to the ratio of the speed of the front and rear transmission mechanisms of the transmission device in the automobile transmission system. The transmission ratio of the automobile transmission system is the speed ratio of the main transmission and the speed ratio of the transmission. In the same model, the speed ratio of the main transmission is a fixed value, and the speed ratio of the transmission also has different values depending on the gears used. The speed ratio data of various types of vehicles can be found in the automobile performance information manual. When the transmission ratio is too small, the car works under heavy load, and the acceleration is not good, and noise and vibration will appear; When the transmission ratio is too large, the fuel economy is poor and the noise of engine running at high speed is high.Therefore, whether the speed ratio is large or small, car owners need to combine their actual situation, and only what suits them is the most important. If car owners usually drive on a relatively smooth road during daily driving, they can choose a vehicle with a smaller speed ratio, because this kind of vehicle has relatively low fuel consumption and high cost performance; However, if car owners drive in a complex environment, they can choose a vehicle with a high speed ratio, because this vehicle has a strong climbing force and is suitable for climbing.
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