一:概述
NAGKT-I型数字式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**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 |
最 大 输 出 |
精度(23℃±2℃) |
直 流 | 500mV | 0~550.00mV | 0.01mV | 100mA |
±(读数值×0.05%+满量程值×0.01%) |
5V | 0~5.5000V | 0.1mV | 100mA | ||
电 | 50V | 0~55.000V | 1mV | 100mA | |
压 | 500V | 0~550.00V | 10mV | 20mA | |
| 1KV | 0~1050.0V | 100mV | 10mA | |
直 流 电 流 | 500uA | 0~550.00uA | 0.01uA | 2V | ±(读数值×0.1%+满量程值×0.02%)
|
5mA | 0~5.5000mA | 0.1uA | 2V | ||
50mA | 0~55.000mA | 1uA | 2V | ||
500mA | 0~550.00mA | 10uA | 2V | ||
5A | 0~5.5000A | 100uA | 1.5V | ±(读数值×0.1%+满量程值×0.04%) | |
10A | 0~11.000A | 1mA | 1.5V | ||
交 流 电 压 | 500mV | 0~550.00mV | 0.01mV | 100mA |
±(读数值×0.1%+满量程值×0.05%)
AC I 1mA以下不考核
|
5V | 0~5.5000V | 0.1mV | 100mA | ||
50V | 0~55.000V | 1mV | 100mA | ||
500V | 0~550.00V | 10mV | 20mA | ||
1KV | 0~1050.0V | 100mV | 10mA | ||
交 流 电 流 | 500uA |
|
|
| |
5mA | 0~5.5000mA | 0.1uA | 2V | ||
50mA | 0~55.000mA | 1uA | 2V | ||
500mA | 0~550.00mA | 10uA | 2V | ||
5A | 0~5.5000A | 100uA | 1.5V | ±(读数值×0.1%+满量程值×0.01%) | |
10A | 0~11.000A | 1mA | 1.5V | ||
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、2.4MΩ5MΩ、10MΩ、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。
NACKT-I electrical instrument test-bed
I. Overview
NAGKT-I digital electrical instrument calibration test bench (also called:digitalmultimetercalibrator,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 of0.5below thevarious typesof table head. (0 ~ 12MΩ); AC frequency of 50Hz, 60Hz, 400Hz (digital synthesis, the output voltage of the three-phase voltage range of 0 ~ Button toselect). Theabove itemsand range conversion areconverted by internal switches. Using the latest 16-bit A / D converter chip, conversion speed and accuracy has been greatly improved; AC / DCconverter with trueRMS value toensure the accuracy of ACoutput;整机linearity is good. Using a new type of composite high-power amplifier, the output power of strong, highreliability, lowdistortion. Output adjustment using importedpotentiometer, long life,high fineness regulation. The machine adopts "closed-loop control", the output stability is high. Voltageshort-circuit, opencurrent automatic protection, in full compliancewith the new three tableidentification procedures.
Second, the working principle:
The instrument has a digital synthesis sine wave generator unit, power amplifier unit,powerand protectionunit,range unit, A / D unit, display unit, keyboard unit and standard resistors and other components.
Third, the technical performance:
2.1 Performance parameters:
Item | Test Range | Output Range | Resolution | Max Output |
Accuracy(23℃±2℃) |
DC Voltage
| 500mV | 0~550.00mV | 0.01mV | 100mA | ±(读数值×0.05%+满量程值×0.01%) ±(Reading value ×0.05% + full scalevalue×0.01%) |
5V | 0~5.5000V | 0.1mV | 100mA | ||
| 50V | 0~55.000V | 1mV | 100mA | |
| 500V | 0~550.00V | 10mV | 20mA | |
| 1KV | 0~1050.0V | 100mV | 10mA | |
DC Current | 500uA | 0~550.00uA | 0.01uA | 2V | ±(读数值×0.1%+满量程值×0.02%) ±(Reading value ×0.1% + full scale value ×0.02%)
|
5mA | 0~5.5000mA | 0.1uA | 2V | ||
50mA | 0~55.000mA | 1uA | 2V | ||
500mA | 0~550.00mA | 10uA | 2V | ||
5A | 0~5.5000A | 100uA | 1.5V | ±(读数值×0.1%+满量程值×0.04%) ±(Reading value ×0.1% + full scale value ×0.04%) | |
10A | 0~11.000A | 1mA | 1.5V | ||
AC Voltage | 500mV | 0~550.00mV | 0.01mV | 100mA | ±(读数值×0.1%+满量程值×0.05%) ±(Reading value ×0.1% + full scale value ×0.05%)
AC I 1mA not included
|
5V | 0~5.5000V | 0.1mV | 100mA | ||
50V | 0~55.000V | 1mV | 100mA | ||
500V | 0~550.00V | 10mV | 20mA | ||
1KV | 0~1050.0V | 100mV | 10mA | ||
AC Current | 500uA |
|
|
| |
5mA | 0~5.5000mA | 0.1uA | 2V | ||
50mA | 0~55.000mA | 1uA | 2V | ||
500mA | 0~550.00mA | 10uA | 2V | ||
5A | 0~5.5000A | 100uA | 1.5V | ±(读数值×0.1%+满量程值×0.01%) ±(Reading value ×0.1% + full scale value ×0.01%) | |
10A | 0~11.000A | 1mA | 1.5V | ||
Middle Data Resistace | Display Data | Power | Accuracy | ||
10Ω、24Ω、50Ω、100Ω、240Ω 500Ω、1kΩ、2.4kΩ、5kΩ 10kΩ、24kΩ、10kΩ、24kΩ 50kΩ、100kΩ、240kΩ、500kΩ、1MΩ、2.4MΩ5MΩ、10MΩ、24 MΩ |
0.25W
| ±(显示值×0.1%+10mΩ) ±(Readingvalue×0.1%+10mΩ)
| |||
2.2: AC distortion: less than 1%.
2.3: DC ripple factor: not more than 0.5%; current 10A not more than 3%.
2.4: Stability: the instrument warm-up after one hour, 1 minute output drift should belessthan the full rangeofthe basic range of ±0.05%, for precision measurements need to warm up 2 hours.
2.5: Overall dimensions: 480×340×134(mm).
2.6: Weight: 10Kg.