華測皮安電流表
一、華測皮安電流表主要特點
1、電流測量范圍極寬：從毫安、微安、納安、皮安到飛安(±1fA～±20mA)
2、體積小、重量輕、準確度高，1/2位數(shù)字顯示
3、性好穩(wěn)定、讀數(shù)方便
4、有兩種測試模式：普通模式(NORMAL)和低阻模式(FAST),在普通模式(NORMAL)即可以很簡便擴展到測量更大的電流，也能測量極微弱電流和測量電容較大的測量對象。
5、在低阻快速模式(FAST)下，其輸入端壓降幾乎為0(μV量級），在測量電路中幾乎不產(chǎn)生壓降,也即電流表的內(nèi)阻幾乎為0[1]，所以不會影響原電路中的電流，這種方式下測量精度更高，適用于測量低壓降高內(nèi)阻的測量對象。外加直流電壓源可用于測量超高電阻。
二、華測皮安電流表技術(shù)指標
1、電流測量范圍為±20×10-3A～±1×10-15A (1fA-20mA) ±1飛安到20毫安
2、表頭顯示: 4.1/2位LED顯示
3、基本準確度: 0.5～1%
4、使用環(huán)境: 溫度：0℃～40℃，相對濕度<80%
5、供電形式: AC 220V，50HZ，功耗約5W
6、普通模式(NORMAL)和低阻快速模式(FAST), 直接切換,直接讀數(shù)。
三、華測皮安電流表應(yīng)用領(lǐng)域
1、測量防靜電鞋、導(dǎo)電鞋的電阻值
2、測量防靜電、導(dǎo)電材料的電阻及電阻率(ISO1853,GB/T 2439)
3、測量計算機房用活動地板的系統(tǒng)電阻值
4、測量絕緣材料電阻(率)
5、光電二極管暗電流測量
6、物理,光學和材料研究
用電流表測量電流時，電流表的內(nèi)阻越小或測量時的壓降越小時對原測量電路的影響越小，Huace122皮安表FAST模式時內(nèi)阻幾乎為0，在電路中的zui大壓降也不會超過200μV，所以測量時精度高。
四、華測皮安電流表典型應(yīng)用
1、導(dǎo)電和防靜電橡膠、塑料—電阻率測量
（標準ISO1853）這種方法又叫四電極方法，因為測量時用兩個電壓電極和兩個電流電極。所以叫四電極，如圖示，將試樣（10mm～150mm寬，70mm～150mm長，2.4-6.3mm厚)。將相距10-20mm的兩電壓電極放置在測樣上，把FS3型靜電計(另購)與兩電壓電極按圖連接好，且電壓電極與電流電極的距離要大于20mm以上，把ＰＢ－12型電流表串在Ａ的位置，施加電壓，讀取1分鐘后FS3靜電計的電壓Ｖ和電流表上的電流Ｉ，用下式計算平均電阻：
R(平均電阻）＝V（靜電計讀數(shù)）÷I（流過試樣的電流）
再計算電阻率：
電阻率ρ＝R（平均電阻）×S（測樣截面積）÷L(電壓電極距離)
2、測量防靜電膠底鞋、導(dǎo)電膠底鞋的電阻
（國家標準GB4386－84）按下圖把ＰＢ－12型電流表串在Ａ的位置，用電壓表Ｖ測量電壓，施加電壓，讀取電壓Ｖ和電流表Ａ上的電流Ｉ，用下式計算電阻： R(鞋的電阻）＝V/I
A current meter
A, main features
1, the current measuring range wide: from a Na, PA, Ma, Fei An (+ 1fA ~ + 20mA)
2, small size, light weight, high accuracy, 1/2 digital display
3, good stability, easy reading
4, there are two kinds of test modes: normal mode (NORMAL) and the low resistivity model (FAST), in the normal mode (NORMAL) which can be easily extended to higher current measurement, can measure object larger measurement of weak current and capacitance measurement.
5, in the fast mode and low resistance (FAST), the input voltage is almost 0 (V level), almost no pressure drop in the measurement circuit, the internal resistance of ammeter is almost 0[1], so it will not affect the current in the primary circuit in this way, high measurement precision, is suitable for the measurement of pressure drop measuring high resistance. The applied DC voltage source can be used for measuring high resistance.
Two, technical indicators
1, the current measurement range is 20 * 10-3A ~ + 1 * 10-15A (1fA-20mA) + 1 flight to 20 mA
2, the meter display: 4.1/2 LED display
3, basic accuracy: 0.5 ~ 1%
4, the use of the environment: temperature: 0 to 40 DEG C, relative humidity<80%
5 power supply: AC, 220V, 50HZ, power consumption is about 5W
6, the common mode (NORMAL) and low resistance, fast mode (FAST) switch, direct, direct reading.
Three, application
1, resistance measurements of anti-static shoes, conductive shoes value
2, measurement of resistance, anti electrostatic conductive materials and electrical resistivity (ISO1853, GB/T 2439)
3, measurement of the computer room with movable floor system resistance
4, insulation resistance measurement (rate)
5, photodiode dark current measurement
6, physics, optics and materials research
Current meter to measure the current, voltage resistance meter is small or when measuring the smaller influence on the measurement circuit is small, the internal resistance of almost 0 of Huace122 it FAST mode, the maximum pressure drop in the circuit is not more than 200 V, so the measurement precision is high.
Four, the typical application
1, conductive and antistatic rubber, plastics and electrical resistivity measurement
(ISO1853 standard) this method is called the four electrode method, because the measurement with two voltage electrode and the two current electrode. So called four electrodes, as shown in the diagram, the specimens (10mm ~ 70mm ~ 150mm wide, 150mm long, 2.4-6.3mm thick). Two voltage electrodes are placed in the 10-20mm sample, the FS3 electrometer (optional) and the two voltage electrodes to connect, and the electrode voltage and current electrode distance should be larger than 20mm, the PB - 12 type current meter on the position of A, applied voltage, read 1 minutes after FS3 the electrometer Ammeter voltage V and current I, calculate the average resistance type:
R (average resistance) = V (electrostatic meter reading (I), the current through the sample)
Then calculate the resistivity:
The resistivity of R (mean = resistance) * S (sample cross-sectional area (L), voltage and electrode distance)
2, resistance measurements of anti-static shoes, conductive rubber soled shoes
(the national standard GB4386 - 84) in the PB - 12 type current meter on the position of A, with a voltage applied voltage meter V measuring voltage, current meter, voltage and current of V to read A I, calculated by the following formula: R (resistance shoes resistance) = V/I
