The type of DL08-25a

Switch-mode DC Standard Resistor Box

Manual

First. Resistance box structure.

Resistance box is the value of variable resistor measuring resistance, the resistance value can be known by the scope of the ladder must be changed.

Standard switch-mode DC resistance of the resistor box to the various components are then contact between the rotating and fixed in a frame in contact with brush contacts on the .

Box in which resistor is being used between the initial contact resistance is the use of brush and touched by the resistance between contacts.

Second.use

1, for the DC circuit for precision resistance adjustment purposes.

2, machine resistance check box under the one-thousandth.

3, the use of machine precision resistance box to check a single DC power portable bridges.

Third, the main technical indicators of resistance box

1, measuring range :0.01 ----- 11111 .1 ohms
2, in compliance with the following conditions of use, the resistance will not exceed the error box in Table 1 to allow the basic error.

   ⑴, ambient air temperature of 20 - ± 3℃, relative humidity of 80% or less;
⑵, current to direct current;
⑶, power does not exceed the rating.

3, the basic error of resistance box as shown in table 1 provides that:

4, resistance box between the internal circuits and the shell of the insulation resistance should be not less than 1000 megohm test voltage of 500 volts
5. Resistor box line and the insulation between shell strength, must be able to withstand a frequency of 50 weeks, the actual volt AC sine wave of the role in 2000, Lee at one minute.
6, resistance box between the block should not exceed the maximum allowable current provisions of Table 2

7, Overall dimensions to 340X165X148 mm and weighing about 4 kg

Fourth, the structural characteristics of resistance box

Bearing resistance box with a potential client can lead to component test, switch contact ring and brush contact films are used between the micro-spring-pressed, so the long-term use, the contact resistance variation of small, bearing a high insulation Feng poly plastic materials, insulation, and panel show the value of reading can be arranged in two linear time simple and clear to show the value of switch resistance on me all the time zero, zero-resistance of 0.01 ohm. Therefore, the smallest non-zero switching step, starting at 1, in the course of the measurement results do not have to deduct zero resistance. High-stability resistor elements manganese to copper alloy wire system without a sense of style around the ceramic tube and a rigorous process and therefore have a high stability. DL08-56-type resistance box wide for schools, factories and scientific research units for power measurement and other experimental purposes.

V, storage use and ensure that deadlines

1, the proper use of resistance box should be the first rotary knob about the groups, the use of stable and reliable contact.
2, resistance boxes in the course of tablets should be regular cleaning brush, cleaning cotton fist used in gasoline in contact with the surface of Central Wipe after lightly coated with a layer of evenly Vaseline can be neutral.
3, where the use and storage temperature should be +10℃-----+ 30℃, relative humidity should not fight in 8% ambient air should not contain corrosive gas.
4, resistor box from the factory to ensure that deadline date foreighteen hours.

Sixth. together with the supply of paper products are

1, packing list
2, product certification
3, Product Manual

Shanghai DomoreElectronic Science and Technology Co., Ltd.

Address: Number128，Jinjia Dun，fuyang，Hangzhou,Zhejiang Province.

DL08-25a檢測報告

檢測溫度20      濕度60%         零電阻0.00998Ω

編號 20140115    

     上海東茂電子科技有限公司

DL08-25a型

開關(guān)式直流標準電阻箱

使用說明書

一、 電阻箱的結(jié)構(gòu)：

電阻箱是電阻值可變的電阻量具，其電阻值可在已知范圍內(nèi)按一定的階梯而改變。開關(guān)式直流標準電阻箱的電阻元件均接于各個觸點之間，而且固定于個旋轉(zhuǎn)架的接觸電刷則在觸點上移動。在此種電阻箱里被利用的電阻是介于起始觸點和在使用時電刷所觸及的觸點之間的電阻。

二、 用    途

1、 供直流電路中作精密調(diào)節(jié)電阻之用。

2、 整機校驗千分之一下的電阻箱

3、 采用精密電阻箱來整機校驗攜帶式直流單電橋等

三、           電阻箱主要技術(shù)指標

1、 測量范圍：0.01-----11111.1歐姆

2、 在遵守下列使用條件時，電阻箱的誤差不會超過表1允許的基本誤差。

⑴、           周圍空氣溫度為20--±3℃，相對濕度在80%以下；

⑵、           電流為直流電；

⑶、           功率不超過額定值。

3、 電阻箱的基本誤差如表1規(guī)定：

4、      

4、     電阻箱內(nèi)部線路與外殼之間的絕緣電阻,應(yīng)不少于1000兆歐,實驗電壓為500伏

5、     .電阻箱線路與外殼之間的絕緣強度，須能經(jīng)受住頻率為50周，實際正弦波2000伏交流電的作用，利時一分鐘。

6、     電阻箱各擋之間大允許電流不應(yīng)超過表2規(guī)定

7、  外型尺寸為340X165X148毫米，重量約4公斤

四、電阻箱結(jié)構(gòu)特點

電阻箱支座具有電位引出端可以按元件檢定，開關(guān)中的接觸環(huán)，接觸片和電刷之間均用微彈簧緊壓，因此*使用后，接觸電阻變差小，支座采用高絕緣聚鳳材料塑，絕緣性能好，面板上讀數(shù)示值排列成二條直線可簡潔而清晰的讀出示值，電阻箱所有轉(zhuǎn)換開關(guān)放在零位時，零電阻為0.01歐姆。因此，小步進開關(guān)無零位，從1開始，在使用過程中對測量結(jié)果中不必扣除零電阻。電阻元件采用高穩(wěn)定錳銅合金線以無感式繞制與瓷管上經(jīng)過嚴格的工藝處理，所以具有高穩(wěn)定性。DL08-56型電阻箱廣泛適合學(xué)校、工廠和科研單位作電測量和其他實驗之用。

五、儲存使用和保證期限

1、       正確使用電阻箱時應(yīng)先旋轉(zhuǎn)一下各組旋鈕，使用接觸穩(wěn)定可靠。

2、       電阻箱在使用過程中應(yīng)定期清洗電刷片，清洗時用棉花攥以汽油在接觸環(huán)的表面輕輕擦試后均勻地涂上一層中性凡士林既可。

3、       使用和儲存的地方溫度應(yīng)在+10℃-----+30℃，相對濕度不打于8%周圍空氣不應(yīng)含有腐蝕性氣體。

4、       電阻箱的保證期限自出廠日期為十八月