\nT/HBJLXH 008-2023 Calibration Method for Temperature Rise Testing Machine

Scope

Main Technical Content: 4 Measuring Characteristics 4.1 Voltage and Current Error: ±0.2% FS. 4.2 Temperature Indicator Error: ±2℃. 4.3 Time Relay Timing Error: ±0.2% FS. 6 Calibration Items and Methods 6.1 Visual Inspection of General Characteristics The appearance and general characteristics of the device should be inspected visually and meet the requirements of 5.2. 6.2 Current and Voltage Indicator Error and Calibration Methods a) Selection of Calibration Points: - Select 5 calibration points evenly across the range of the ammeter or voltmeter, or select calibration points according to customer requirements. - In the power-off state of the device, connect the electronic load to the instrument's measurement terminals and connect a high-precision standard ammeter to the electronic load's current loop. - Adjust the test power regulator device counterclockwise to the minimum load point. - Turn on the device power switch to power it on, set the electronic load to the first calibration point, and adjust the test power regulator device to stabilize the load current at the first calibration point. Simultaneously, record the instrument's current reading and the current value displayed by the high-precision standard ammeter in the original record. - Calibrate the other measurement points in the same manner. - If the device has a voltage display function, use a digital multimeter to measure the voltage value at each point and record it in the original record. - The error of the voltage and current indications are expressed by Formula (1), and the relative error is expressed by Formula (2): $\Delta = PX - PN$ (1) where: $\Delta$ — Indicator error; $PX$ — Indicator value of the calibrated meter; $PN$ — Reference value (standard value) of the corresponding input quantity. $\gamma = \frac{(PX - PN)}{PN}$ (2) where: $\gamma$ — Relative indicator error. 6.3 Temperature Indica

Development Information

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