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Peng Huading, who was already disappointed, couldn't help but have a trace of suspicion, and said in his heart: "He seems to have a ghost in his heart." ”

Thinking of this, he carefully looked at all the meters again, and at the same time carefully looked at the values of each ammeter. Looking at it, he finally showed a clue:

The current value displayed by the AC ammeter installed on the rectifier is not much different from the current value displayed by the AC ammeter on the AC distribution cabinet! The ammeter on the AC distribution cabinet shows a current value of just over fifteen amps, while the ammeter on the rectifier shows a current value of nearly sixteen amps! There is an extra 0.5 or so an, and if you don't look carefully, you can't see it at all.

Under normal circumstances, or under the premise of accurate metering, the current value on the front AC distribution cabinet should be greater than the current value on the rectifier, even if there is no other load, the current behind should be equal to the front, and it will never pass the front, because whether it is a rectifier or a transformer, it is possible to only consume energy and cannot increase energy.

Even people without any technical knowledge know this!

Peng Huading's mind moved, and his movements were a little exaggerated to look between the two ammeters, and at the same time quietly paid attention to Wu Shibo's movements.

Sure enough, he glared at one of the manufacturer's staff.

The staff member showed a hint of grievance on his face, but then he came over and said, "Young man, what's now?" These rectifiers and power distribution panels are our company's. ......, do you have a mismatch between the values of the two ammeters? ”

Peng Huading nodded and said, "Yes, the difference is 0.5 amperes, and the current figure of the power distribution screen behind is a little larger?" ”

The staff member smiled: "Hehe, aren't you finding fault with us?" It's not that our watch is inaccurate, it's that it hasn't been cleared for a long time. You ask all the maintainers, who still looks at the numbers shown on these tables now? You're making too much of a fuss, too. ”

He was right, these meters were basically not looked at.

Maintenance personnel are not as responsible as before, they just need to know whether there is or no current, the value is a little higher and a little lower no one cares at all, and naturally no one goes to the meter, the number of the meter display jù generally has a large error, not to mention that it is only a difference of 0.5 An, that is, a difference of 2 An, 3 An.

Peng Huading sneered in his heart: It is indeed normal that the number displayed by these useless meters is not correct, but why do you care so much about normal situations? An expert who had just been arrogant began to feel weak, and a gloating man hastened to explain.

Peng Huading, who had made up his mind, suddenly reached out and pressed the red button marked with the word "off" on the power distribution screen.

"Smack!" There was a crunch.

"Ahh ”

Peng Huading pressed the button of the power distribution screen, and the air switch installed in the screen tripped with a crisp sound, and then the alarm light in the rectifier lit up, and the alarm horn shouted "woo woo woo".

Not only Wu Shibo and others were surprised, but also other manufacturers.

Peng Huading's eyes quickly swept over the two ammeters on the distribution screen and the rectifier, and then apologized while pressing the green button marked with the word "on" on the distribution screen: "I'm sorry, I'm sorry, I touched the wrong place." ”

The air switch in the power distribution screen made a crisp sound again, and then the alarm red light on the rectifier disappeared, and then the alarm horn also stopped chirping, and it returned to normal.

From pressing the "off" to pressing the "on" buttons, Peng Huading took less than three seconds before and after, and people who don't know may really think that Peng Huading has hit the wrong place. But Peng Huading knew what he was doing, and he also believed that Wu Shibo and the factory staff who spoke just now also knew what they were doing.

After Peng Huading pressed the red button of "off", the AC power was cut off, and the AC ammeter pointer on both the power distribution screen and the rectifier should be reset to zero. Even if both tables have zài errors, their hands should be deflected sharply to the left, and the pointers will move closer to zero and close to zero.

If what the staff of the manufacturer said just now is right, then the ammeter pointer on the distribution screen is closer to zero because of less error, and the ammeter pointer on the rectifier is farther away from zero because of more error, but the amplitude of deflection should be the same.

However, after Peng Huading pressed the red button, the hands of the two ammeters were only deflected to the left by a small distance.

When the green button is pressed - when the alternating current is turned on, the two hands are restored - only a small distance to the right.

Seeing that the pointer was only slightly deflected, Peng Huading was relieved and happy: this situation was the same as he expected! Because of the backward economy, there are not many people who install telephones, the load of telecommunication equipment is very small, and the battery capacity is too large, and the capacity of the battery does not match the load they carry.

It is precisely because of the long-term mismatch between the two, and the rural power is very unstable, frequent power outages, the battery is constantly discharged with a small current, charged with a small current, its performance deteriorates quickly, and finally the real capacity of these batteries becomes very small, not to mention that it is impossible to reach the dozens of hours that they should carry according to the rated capacity, that is, the telecommunication equipment can not work continuously for nine hours, and communication accidents will inevitably occur.

At the same time, he dug a hole for Wu Shibo and the personnel of other manufacturers -- it should be said that it was for Huakang Company -- that they deliberately mobilized the pointers of the DC ammeter and the two AC ammeters, so that the number jù displayed by the DC ammeter was within the optimal load current range of the battery, and the number jù displayed by the two AC meters corresponded to the number jù of the DC ammeter.

The single-phase voltage of the mains is 22o volts, and the nominal voltage required by the telecommunication equipment is 48 volts, and the power factor is taken as o.8, when the number jù displayed by the DC meter is 55 amperes, the digital value of the AC ammeter is about 15.6 amperes.

This is just a simple math problem, and Wu Shibo and the manufacturer naturally made it easy to make an illusion.

As for why the number of the two AC meters is different, and even the value of the power distribution screen is a little larger, it is not that they are negligent, let alone stupid, but they did not expect Peng Huading to come here because of suspicion, and they did not expect Peng Huading to be able to associate the small load of telecommunications equipment from the depression outside the town, so they associate the battery capacity with the load of Yan Zòng, and find the real cause of the battery damage, that is, the real cause of the communication accident.

In the minds of Wu Shibo and others, Peng Huading, a young man, saw the bad appearance of the battery in the battery room, and he would definitely think that the problem was the quality of the battery if he didn't understand the battery technology, and he wouldn't think of the load problem at all. Even if he happened to think of it, after seeing the number displayed by those meters, he would stop there, and it was impossible to check the real load of the telecommunications equipment.

Because it was concluded that Huakang's technicians would not be looking for trouble here, it was because they did not take the time to calibrate the pointer accurately.

In fact, Peng Huading did not find the crux of the fault by seeing the number displayed on the two ammeters, he just used a few meters to expose their conspiracy more intuitively and quickly, and put all their conspiracies in the sun with just two small actions.