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华测皮安电流表

一、华测皮安电流表主要特点
1、电流测量范围极宽：从毫安、微安、纳安、皮安到飞安(±1fA～±20mA)
2、体积小、重量轻、准确度高，1/2位数字显示
3、性好稳定、读数方便
4、有两种测试模式：普通模式(NORMAL)和低阻模式(FAST),在普通模式(NORMAL)即可以很简便扩展到测量更大的电流，也能测量极微弱电流和测量电容较大的测量对象。
5、在低阻快速模式(FAST)下，其输入端压降几乎为0(μV量级），在测量电路中几乎不产生压降,也即电流表的内阻几乎为0[1]，所以不会影响原电路中的电流，这种方式下测量精度更高，适用于测量低压降高内阻的测量对象。外加直流电压源可用于测量超高电阻。

二、华测皮安电流表技术指标
1、电流测量范围为±20×10-3A～±1×10-15A  (1fA-20mA) ±1飞安到20毫安
2、表头显示: 4.1/2位LED显示
3、基本准确度: 0.5～1%
4、使用环境: 温度：0℃～40℃，相对湿度<80%
5、供电形式: AC 220V，50HZ，功耗约5W
6、普通模式(NORMAL)和低阻快速模式(FAST), 直接切换,直接读数。

三、华测皮安电流表应用领域
1、测量防静电鞋、导电鞋的电阻值
2、测量防静电、导电材料的电阻及电阻率(ISO1853,GB/T 2439)
3、测量计算机房用活动地板的系统电阻值
4、测量绝缘材料电阻(率)
5、光电二极管暗电流测量
6、物理,光学和材料研究
   用电流表测量电流时，电流表的内阻越小或测量时的压降越小时对原测量电路的影响越小，Huace122皮安表FAST模式时内阻几乎为0，在电路中的zui大压降也不会超过200μV，所以测量时精度高。

四、华测皮安电流表典型应用
1、导电和防静电橡胶、塑料—电阻率测量
（标准ISO1853）这种方法又叫四电极方法，因为测量时用两个电压电极和两个电流电极。所以叫四电极，如图示，将试样（10mm～150mm宽，70mm～150mm长，2.4-6.3mm厚)。将相距10-20mm的两电压电极放置在测样上，把FS3型静电计(另购)与两电压电极按图连接好，且电压电极与电流电极的距离要大于20mm以上，把ＰＢ－12型电流表串在Ａ的位置，施加电压，读取1分钟后FS3静电计的电压Ｖ和电流表上的电流Ｉ，用下式计算平均电阻：
   R(平均电阻）＝V（静电计读数）÷I（流过试样的电流）
   再计算电阻率：
   电阻率ρ＝R（平均电阻）×S（测样截面积）÷L(电压电极距离)
2、测量防静电胶底鞋、导电胶底鞋的电阻
（国家标准GB4386－84）按下图把ＰＢ－12型电流表串在Ａ的位置，用电压表Ｖ测量电压，施加电压，读取电压Ｖ和电流表Ａ上的电流Ｉ，用下式计算电阻：     R(鞋的电阻）＝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