When using a calorimeter to measure the heat of coal:
(1) Since the temperature values ​​(relative temperature values) measured by the respective temperature measuring probes are not the same, their linearity is not completely the same, so when the temperature measuring probe is replaced, the heat capacity of the calorimeter needs to be recalibrated.
(2) When the heat capacity calibration and calorific value are measured, the heat capacity should be recalibrated when the room temperature differs by more than 5 °C. Although the platinum resistance is linear over a certain temperature range, it does not need to be averaged for correction when it operates in the specified temperature range, otherwise it will cause non-negligible errors. If there is no condition to correct the average index value of the temperature probe, the heat capacity of the instrument can be recalibrated so that the calibration heat capacity is consistent with the temperature measurement condition when measuring the heat generation to offset the measurement error of the thermometer.
(3) When using the coal standard substance or using standard benzoic acid to check the accuracy of the calorimeter, if the measured value is found to be inconsistent with the standard value, that is, the measured value and the standard value exceed the uncertainty range, or the benzoic acid When the difference between the measured value and the standard heating value exceeds 50 J/g, the heat capacity of the calorimeter should be recalibrated if no other reason can be found.
Modular Jack section
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RJ45 interface can be used to connect RJ-45 connectors. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports.
RJ45 is a type of different connectors (for example: RJ11 is also a type of connector, but it is used on the telephone); there are two different ways to arrange the RJ-45 connector: one is white orange, orange, white green, blue, white blue, green, white brown, brown; the other is white green, green, white orange, blue, white blue, orange, white brown, brown; therefore, there are also wires with RJ45 connector There are two kinds: straight line and interleaved line.
The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs. It should be noted that when connecting to different devices, the jumper method of twisted pair cable used is different.
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