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高频介电常数测试仪特点  测试注意事项

a．本仪器应水平安放；b．如果你需要较精确地测量，请接通电源后，预热30分钟；

c．调节主调电容或主调电容数码开关时，当接近谐振点时请缓调；d．被测件和测试电路接线柱间的接线应尽量短，足够粗，并应接触良好、可靠，以减少因接线的电阻和分布参数所带来的测量误差；

e．被测件不要直接搁在面板顶部，离顶部一公分以上，必要时可用低损耗的绝缘材料如聚苯乙烯等做成的衬垫物衬垫；f．手不得靠近试件，以免人体感应影响造成测量误差，有屏蔽的试件，屏蔽罩应连接在低电位端的接线柱。

 Testing precautions
 
a. This instrument should be placed horizontally; b. If you need more accurate measurement, please preheat for 30 minutes after turning on the power;
 
c. When adjusting the main capacitor or digital switch of the main capacitor, please adjust slowly when approaching the resonance point; d. The wiring between the tested component and the test circuit terminal should be as short and thick as possible, and should have good and reliable contact to reduce measurement errors caused by the resistance and distribution parameters of the wiring;
 
e. Do not place the test piece directly on the top of the panel, more than one centimeter away from the top. If necessary, use low loss insulation materials such as polystyrene to make padding; f. Hands should not be close to the test piece to avoid measurement errors caused by human induction. For shielded test pieces, the shielding cover should be connected to the terminal at the low potential end.

高频介电常数测试仪特点频率

 因为只有少数材料如石英玻璃、聚苯乙烯或聚乙烯在很宽的频率范围内它们的。r和tans几乎是恒定的，且被用作工程电介质材料，然而一般的电介质材料必须在所使用的频率下测量其介质损耗因数和电容率。电容率和介质损耗因数的变化是由于介质极化和电导而产生，最重要的变化是极性分子引起的偶极子极化和材料的不均匀性导致的界面极化所引起的.

 frequency
Because only a few materials such as quartz glass, polystyrene, or polyethylene exhibit their properties over a wide frequency range. R and Tan are almost constant and are used as engineering dielectric materials, however, typical dielectric materials must have their dielectric loss factor and permittivity measured at the frequency used. The changes in permittivity and dielectric loss factor are caused by dielectric polarization and conductivity, with the most significant changes being dipole polarization caused by polar molecules and interface polarization caused by material inhomogeneity

Q值测量

   a．Q值测量范围：2～1023。

   b．Q值量程分档：30、100、300、1000、自动换档或手动换档。

 c．标称误差

项   目GDAT-A

频率范围20kHz～10MHz；

固有误差≤5％

工作误差≤7％

频率范围10MHz～60MHz；

固有误差≤6％

工作误差≤8％

 Q-value measurement
a. Q-value measurement range: 2-1023.
b. Q-value range: 30, 100, 300, 1000, automatic or manual shifting.
c. Nominal error
Project GDAT-A
Frequency range: 20kHz to 10MHz;
Inherent error ≤ 5%
Work error ≤ 7%
Frequency range: 10MHz to 60MHz;
Inherent error ≤ 6%
Work error ≤ 8%

频率范围

10kHz～50MHz

频率分段

(虚拟)

10～99.9999kHz

100～999.999kHz

1～9.99999MHz

10～60MHz   

高频电桥
由于它不再是一个高压电桥，因此承受电压U1的臂能容易地引人可调元件;替代法在此适用
 还应指出，带有分开的初级绕组的电桥允许电源和检测器互换位置。其平衡与在次级绕组中对应
的安匝数的补偿相符.

安全措施

（1）高压保护：试品短路、击穿或高压电流波动，能迅速切断高压输出。

（2）CVT保护：设定自激电压的过流点，一旦超出设置的电流值，仪器自动退出测量，不会损坏设备。

（3）接地检测：仪器有接地检测功能，未接地时不能升压测量。

（4）防误操作：具备防误操作设计，能判别常见接线错误，安全报警。

（5）防“容升”：测量大容量试品时会出现电压抬高的“容升”效应，仪器能自动跟踪输出电压，保持试验电压恒定。

High-frequency bridge
Since it is no longer a high-voltage bridge, the arm that can withstand voltage U1 can easily be connected to adjustable components; The substitution method applies here
It should also be pointed out that a bridge with separate primary windings allows the power supply and detector to exchange positions. Its balance corresponds to the secondary winding
The compensation for the ampere turns is consistent
 
Security measures
(1) High voltage protection: The test sample can quickly cut off the high voltage output due to short circuit, breakdown or high voltage current fluctuation.
(2) CVT protection: Set the overcurrent point of the self-excited voltage. Once the set current value is exceeded, the instrument will automatically exit the measurement without damaging the equipment.
(3) Grounding detection: The instrument has a grounding detection function and cannot measure voltage when not grounded.
(4) Anti misoperation: With anti misoperation design, it can identify common wiring errors and provide safety alarms.
(5) Prevent "capacitance rise": When measuring large capacity test samples, there will be a "capacitance rise" effect of voltage rise. The instrument can automatically track the output voltage and maintain a constant test voltage.

测量范围及误差

    本电桥的环境温度为20?5℃，相对湿度为30％－80％条件下，应满足

下列表中的技术指示要求。

    在Cn＝100pF    R4＝3183.2（W）（即10K/π）时

    测量项目      测量范围            测量误差              

    电容量Cx       40pF--20000pF      ?0.5%  Cx?2pF     

    介质损耗tgd      0～1              ?1.5％tgdx?0.0001

    在Cn＝100pF      R4＝318.3（W）（即1K/π）时

    测量项目      测量范围            测量误差              

    电容量Cx       4pF--2000pF      ?0.5%  Cx?3pF     

    介质损耗tgd      0～0.1          ?1.5％tgdx?0.0001

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