高頻介電常數測試儀特點  測試注意事項

a．本儀器應水平安放；b．如果你需要較精確地測量，請接通電源后，預熱30分鐘；

c．調節主調電容或主調電容數碼開關時，當接近諧振點時請緩調；d．被測件和測試電路接線柱間的接線應盡量短，足夠粗，并應接觸良好、可靠，以減少因接線的電阻和分布參數所帶來的測量誤差；

e．被測件不要直接擱在面板頂部，離頂部一公分以上，必要時可用低損耗的絕緣材料如聚苯乙烯等做成的襯墊物襯墊；f．手不得靠近試件，以免人體感應影響造成測量誤差，有屏蔽的試件，屏蔽罩應連接在低電位端的接線柱。

 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.

高頻介電常數測試儀特點頻率

 因為只有少數材料如石英玻璃、聚苯乙烯或聚乙烯在很寬的頻率范圍內它們的。r和tans幾乎是恒定的，且被用作工程電介質材料，然而一般的電介質材料必須在所使用的頻率下測量其介質損耗因數和電容率。電容率和介質損耗因數的變化是由于介質極化和電導而產生，最重要的變化是極性分子引起的偶極子極化和材料的不均勻性導致的界面極化所引起的.

 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值測量

   a．Q值測量范圍：2～1023。

   b．Q值量程分檔：30、100、300、1000、自動換檔或手動換檔。

 c．標稱誤差

項   目GDAT-A

頻率范圍20kHz～10MHz；

固有誤差≤5％

工作誤差≤7％

頻率范圍10MHz～60MHz；

固有誤差≤6％

工作誤差≤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%

頻率范圍

10kHz～50MHz

頻率分段

(虛擬)

10～99.9999kHz

100～999.999kHz

1～9.99999MHz

10～60MHz   

高頻電橋
由于它不再是一個高壓電橋，因此承受電壓U1的臂能容易地引人可調元件;替代法在此適用
 還應指出，帶有分開的初級繞組的電橋允許電源和檢測器互換位置。其平衡與在次級繞組中對應
的安匝數的補償相符.

安全措施

（1）高壓保護：試品短路、擊穿或高壓電流波動，能迅速切斷高壓輸出。

（2）CVT保護：設定自激電壓的過流點，一旦超出設置的電流值，儀器自動退出測量，不會損壞設備。

（3）接地檢測：儀器有接地檢測功能，未接地時不能升壓測量。

（4）防誤操作：具備防誤操作設計，能判別常見接線錯誤，安全報警。

（5）防“容升”：測量大容量試品時會出現電壓抬高的“容升”效應，儀器能自動跟蹤輸出電壓，保持試驗電壓恒定。

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.

測量范圍及誤差

    本電橋的環境溫度為20?5℃，相對濕度為30％－80％條件下，應滿足

下列表中的技術指示要求。

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

    測量項目      測量范圍            測量誤差              

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

    介質損耗tgd      0～1              ?1.5％tgdx?0.0001

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

    測量項目      測量范圍            測量誤差              

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

    介質損耗tgd      0～0.1          ?1.5％tgdx?0.0001

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