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If the range is less than lomv, Rm is connected when R in the short-circuit feedback loop is greater than lomV. When the zero migration range is small, connect R:d and w: in parallel; if the zero migration scope is medium, it does not help; when the zero migration range is greater than 50mv, R:d and wa are connected in series. Then press the calibration circuit. Rcu should be short-circuited during verification.
2) The cable fault tester checks the bridge current. Adjust w: make the bridge current 1mA. Connect a current meter between terminals 4 and 6 to check if it is 1 mA.
3) Open-loop amplification inspection and anti-signal inspection of cable fault tester. Adjust wl to make the feedback voltage zero. Since the potential may have a certain initial resistance, resulting in the feedback voltage is not completely zero, when the time is up, a short circuit between the R2 and the Rm can be shorted to cause the open loop state of the whole machine. Then input a signal to make the output current 0.5-1mA, and then add 50KvDC signal, the output current is greater than 10mA as qualified as up to 1; to 10mA, need to adjust wd to -60mv.
If it is an automatic adjustment system, the regulator should be switched to manual operation, and then the “operation check†switch of the cable fault tester should be checked. Non-automatic adjustment system can directly set the switch to check. If the output current is any value between 4-6mA, the cable fault tester is working properly.
When the temperature sensing element is a thermocouple and needs to be calibrated in the field, a portable cable fault tester can be used instead of the thermocouple to send the mv signal and check whether the output current is correct. At this time, the temperature compensation resistor should be short-circuited. Then you can press the indoor calibration method for military, range, and accuracy verification.
The temperature sensing element is a thermal resistance and a portable resistance box can be used instead of a temperature measurement resistance. Inspect and adjust the zero point, cable fault range and accuracy according to the resistance values ​​of the temperature given at each point on the resistance box.
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Talking about the verification step of the cable fault tester millivolt transmitter
1) Cable fault tester wiring. According to the type of couple, select the temperature compensation resistor Rcu.