一：概述
NAGKT-I型數(shù)字式電氣儀表校驗(yàn)試驗(yàn)臺(tái)（也叫做：數(shù)字式多用表校驗(yàn)儀、三表校驗(yàn)儀）是一種LED五位數(shù)字式交、直流標(biāo)準(zhǔn)電壓、電流發(fā)生器，用于校驗(yàn)數(shù)字式電表、各種指針式電表及直流0.2級(jí)，交流0.5級(jí)以下各類表頭。本儀器電壓輸出五檔（0~1000V）；電流輸出六檔（0~10A）；可以選配：中值電阻2×11檔(0Ω~24MΩ)；交流頻率50Hz,60Hz,400Hz（數(shù)字合成，按鍵選擇）。以上項(xiàng)目及量程變換均通過(guò)內(nèi)部開(kāi)關(guān)轉(zhuǎn)換。采用**的16位A/D轉(zhuǎn)換芯片，轉(zhuǎn)換速度和精度得到了大幅度提高；AC/DC采用真有效值轉(zhuǎn)換芯片，保證了交流輸出的精度；整機(jī)線性度好。采用了新型的復(fù)合大功率放大器，輸出功率強(qiáng)大，可靠性高，失真度小。輸出調(diào)節(jié)采用進(jìn)口電位器，壽命長(zhǎng)，調(diào)節(jié)細(xì)度高。整機(jī)采用“閉環(huán)控制”，輸出穩(wěn)定度高。電壓短路、電流開(kāi)路自動(dòng)保護(hù)，完全符合新三表鑒定規(guī)程。
二、工作原理：
本儀器有數(shù)字合成正弦波發(fā)生器單元、功放單元、電源及保護(hù)單元、量程單元、A/D單元、顯示單元、鍵盤(pán)單元及標(biāo)準(zhǔn)電阻器等組成。
三、技術(shù)性能：
2.1性能參數(shù)：
項(xiàng) ? 目 | ? 量 程 | ? 輸 出 范 圍 | ? 分 辨 率 | ? 最 大 輸 出 | ? 精度（23℃±2℃） |
直 流 | 500mV | 0~550.00mV | 0.01mV | 100mA | ? ±（讀數(shù)值×0.05%+滿量程值×0.01%） |
5V | 0~5.5000V | 0.1mV | 100mA |
電 | 50V | 0~55.000V | 1mV | 100mA |
壓 | 500V | 0~550.00V | 10mV | 20mA |
? | 1KV | 0~1050.0V | 100mV | 10mA |
? 直 流 電 流 | 500uA | 0~550.00uA | 0.01uA | 2V | ±（讀數(shù)值×0.1%+滿量程值×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 | ±（讀數(shù)值×0.1%+滿量程值×0.04%） |
10A | 0~11.000A | 1mA | 1.5V |
交 流 電 壓 | 500mV | 0~550.00mV | 0.01mV | 100mA | ? ? ? ±（讀數(shù)值×0.1%+滿量程值×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 電 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 | ±（讀數(shù)值×0.1%+滿量程值×0.01%） |
10A | 0~11.000A | 1mA | 1.5V |
中 ? 值 ? 電 ? 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 ? ? | ? ? ±（顯示值×0.1%+10mΩ） ? |
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2.2：交流失真度：不大于1%。
2.3：直流紋波系數(shù)：不大于0.5%；電流10A不大于3%。
2.4：穩(wěn)定性：儀器預(yù)熱一小時(shí)后，1分鐘內(nèi)輸出漂移應(yīng)小于基本量程滿度的±0.05%，作精密測(cè)量時(shí)需預(yù)熱2小時(shí)。
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;整機(jī)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 | ±（讀數(shù)值×0.05%+滿量程值×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 | ±（讀數(shù)值×0.1%+滿量程值×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 | ±（讀數(shù)值×0.1%+滿量程值×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 | ±（讀數(shù)值×0.1%+滿量程值×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 | ±（讀數(shù)值×0.1%+滿量程值×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 ? ? | ±（顯示值×0.1%+10mΩ） ±（Readingvalue×0.1%+10mΩ） ? |
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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.
