高頻介電常數(shù)測(cè)試儀特點(diǎn)  測(cè)試注意事項(xiàng)

a．本儀器應(yīng)水平安放；b．如果你需要較精確地測(cè)量，請(qǐng)接通電源后，預(yù)熱30分鐘；

c．調(diào)節(jié)主調(diào)電容或主調(diào)電容數(shù)碼開關(guān)時(shí)，當(dāng)接近諧振點(diǎn)時(shí)請(qǐng)緩調(diào)；d．被測(cè)件和測(cè)試電路接線柱間的接線應(yīng)盡量短，足夠粗，并應(yīng)接觸良好、可靠，以減少因接線的電阻和分布參數(shù)所帶來的測(cè)量誤差；

e．被測(cè)件不要直接擱在面板頂部，離頂部一公分以上，必要時(shí)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(yīng)影響造成測(cè)量誤差，有屏蔽的試件，屏蔽罩應(yīng)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(shù)測(cè)試儀特點(diǎn)頻率

 因?yàn)橹挥猩贁?shù)材料如石英玻璃、聚苯乙烯或聚乙烯在很寬的頻率范圍內(nèi)它們的。r和tans幾乎是恒定的，且被用作工程電介質(zhì)材料，然而一般的電介質(zhì)材料必須在所使用的頻率下測(cè)量其介質(zhì)損耗因數(shù)和電容率。電容率和介質(zhì)損耗因數(shù)的變化是由于介質(zhì)極化和電導(dǎo)而產(chǎn)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(dǎo)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(cè)量

   a．Q值測(cè)量范圍：2～1023。

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

 c．標(biāo)稱誤差

項(xiàng)   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(gè)高壓電橋，因此承受電壓U1的臂能容易地引人可調(diào)元件;替代法在此適用
 還應(yīng)指出，帶有分開的初級(jí)繞組的電橋允許電源和檢測(cè)器互換位置。其平衡與在次級(jí)繞組中對(duì)應(yīng)
的安匝數(shù)的補(bǔ)償相符.

安全措施

（1）高壓保護(hù)：試品短路、擊穿或高壓電流波動(dòng)，能迅速切斷高壓輸出。

（2）CVT保護(hù)：設(shè)定自激電壓的過流點(diǎn)，一旦超出設(shè)置的電流值，儀器自動(dòng)退出測(cè)量，不會(huì)損壞設(shè)備。

（3）接地檢測(cè)：儀器有接地檢測(cè)功能，未接地時(shí)不能升壓測(cè)量。

（4）防誤操作：具備防誤操作設(shè)計(jì)，能判別常見接線錯(cuò)誤，安全報(bào)警。

（5）防“容升”：測(cè)量大容量試品時(shí)會(huì)出現(xiàn)電壓抬高的“容升”效應(yīng)，儀器能自動(dòng)跟蹤輸出電壓，保持試驗(yàn)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(cè)量范圍及誤差

    本電橋的環(huán)境溫度為20?5℃，相對(duì)濕度為30％－80％條件下，應(yīng)滿足

下列表中的技術(shù)指示要求。

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

    測(cè)量項(xiàng)目      測(cè)量范圍            測(cè)量誤差              

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

    介質(zhì)損耗tgd      0～1              ?1.5％tgdx?0.0001

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

    測(cè)量項(xiàng)目      測(cè)量范圍            測(cè)量誤差              

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

    介質(zhì)損耗tgd      0～0.1          ?1.5％tgdx?0.0001

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