NAGKT-I数字式高精度电气仪表试验台 NAGKT-I electrical instrument test bed
数字式高精度电气仪表试验台,高精度电气仪表试验台,电气仪表试验台,数字式电气仪表试验台,数字式多用表校验仪,三表校验仪
一:概述
NAGKT-I型数字式高精度电气仪表校验试验台(也叫做:数字式多用表校验仪、三表校验仪)是一种LED五位数字式交、直流标准电压、电流发生器,用于校验数字式电表、各种指针式电表及直流0.2级,交流0.5级以下各类表头。本仪器电压输出五档(0~1000V);电流输出六档(0~10A);可以选配:中值电阻2×11档(0Ω~24MΩ);交流频率50Hz,60Hz,400Hz(数字合成,按键选择)。以上项目及量程变换均通过内部开关转换。采用*新的16位A/D转换芯片,转换速度和精度得到了大幅度提高;AC/DC采用真有效值转换芯片,保证了交流输出的精度;整机线性度好。采用了新型的复合大功率放大器,输出功率强大,可靠性高,失真度小。输出调节采用进口电位器,寿命长,调节细度高。整机采用“闭环控制”,输出稳定度高。电压短路、电流开路自动保护,完全符合新三表鉴定规程。
二、工作原理:
本仪器有数字合成正弦波发生器单元、功放单元、电源及保护单元、量程单元、A/D单元、显示单元、键盘单元及标准电阻器等组成。
三、技术性能:
2.1性能参数:项
目
量 程
输 出 范 围
分 辨 率
* 大 输 出
精 度(23℃±2℃)直
流500mV0~550.00mV0.01mV100mA
±(读数值×0.05%+满量程值×0.01%)5V0~5.5000V0.1mV100mA电50V0~55.000V1mV100mA压500V0~550.00V10mV20mA 1KV0~1050.0V100mV10mA
直
流
电
流500uA0~550.00uA0.01uA2V±(读数值×0.1%+满量程值×0.02%)
5mA0~5.5000mA0.1uA2V50mA0~55.000mA1uA2V500mA0~550.00mA10uA2V5A0~5.5000A100uA1.5V±(读数值×0.1%+满量程值×0.04%)10A0~11.000A1mA1.5V交
流
电
压500mV0~550.00mV0.01mV100mA
±(读数值×0.1%+满量程值×0.05%)
AC I 1mA以下不考核
5V0~5.5000V0.1mV100mA50V0~55.000V1mV100mA500V0~550.00V10mV20mA1KV0~1050.0V100mV10mA
交
流
电
流500uA 5mA0~5.5000mA0.1uA2V50mA0~55.000mA1uA2V500mA0~550.00mA10uA2V5A0~5.5000A100uA1.5V±(读数值×0.1%+满量程值×0.01%)10A0~11.000A1mA1.5V中
值
电
阻示 值功 率精 度10Ω、24Ω、50Ω、100Ω、240Ω
500Ω、1kΩ、2.4kΩ、5kΩ
10kΩ、24kΩ、10kΩ、24kΩ
50kΩ、100kΩ、240kΩ、500kΩ、1MΩ、2.4MΩ 5MΩ、10 MΩ、24 MΩ
0.25W
±(显示值×0.1%+10mΩ)
2.2:交流失真度:不大于1% 。
2.3:直流纹波系数:不大于0.5%;电流10A不大于3% 。
2.4:稳定性:仪器预热一小时后,1分钟内输出漂移应小于基本量程满度的±0.05%,作精密测量时需预热2小时。
2.5:外型尺寸:480×340×134(mm)。
2.6:重量:10Kg。
NAGKT-I electrical instrument test-bed
First. Overview
NAGKT-I digital electrical instrument calibration test bench (also called: digital multimeter calibrator, three-table calibrator) is a five-digit LED AC, DC standard voltage, current generator for Calibration digital meters, a variety of hands-meter and DC 0.2, the exchange of 0.5 below the various types of table head. (0 ~ 12MΩ); AC frequency of 50Hz, 60Hz, 400Hz (digital synthesis, the output voltage of the three-phase voltage range of 0 ~ Button to select). The above items and range conversion are converted by internal switches. Using the latest 16-bit A / D converter chip, conversion speed and accuracy has been greatly improved; AC / DC converter with true RMS value to ensure the accuracy of AC output; linearity is good. Using a new type of composite high-power amplifier, the output power of strong, high reliability, low distortion. Output adjustment using imported potentiometer, long life, high fineness regulation. The machine adopts "closed-loop control", the output stability is high. Voltage short-circuit, open current automatic protection, in full compliance with the new three table identification procedures.
Second, the working principle:
The instrument has a digital synthesis sine wave generator unit, power amplifier unit, power and protection unit, range unit, A / D unit, display unit, keyboard unit and standard resistors and other components.