国精产品99永久一区一区,强奸乱伦影音先锋,最近最新中文字幕大全免费版,精品国产国产综合精品

　　ZC-8 grounding resistance tester use and scope of application:

　　ZC-8 grounding resistance tester for direct measurement of a variety of grounding device grounding resistance, but also for the general low-resistance measurement, four-button (0 ~ 1 ~ 10 ~ 100Ω specifications) can also measure the soil resistivity.

　　ZC-8 grounding resistance tester main specifications and range as follows:

　　Specification range Minimum qualified value

　　1-10-100 0 ~ 1Ω 0.01

　　0 ~ 10 0.1

　　0 ~ 100 1

　　10-100-100 0 to 10 0.1

　　0 ~ 100 1

　　0 ~ 1000 10

　　ZC-8 grounding resistance tester technical parameters:

　　1. This product complies with GB7676-98 direct role simulation instructions electrical measuring instruments and accessories definition and general requirements and ZBN21012 grounding resistance table professional standards of the relevant provisions.

　　2. The reference value of the instrument is range.

　　3. The basic error of the instrument is a percentage of the reference value indicating that the limit of its basic error is ± 3% of the range.

　　4. Instrument working environment temperature -20 ~ +50 ℃.

　　5. Instrument due to temperature changes caused by changes in instructions, converted to 10 ℃ per change is not greater than the basic error.

　　6. Instrument work environment humidity of 25% to 95%, resulting in changes in the indication value is not greater than the basic error.

　　7. The instrument work position is horizontal.

　　8. The instrument is tilted by 5 ° in either direction from the horizontal working position, thereby causing the indication value to change no more than 1/2 of the basic error.

　　9. The instrument under the influence of the external magnetic field strength of 0.4KA / m caused by the indication value of the change is not greater than 1.5% of the reference value.

　　10. Insulation resistance between instrument line and housing is not less than 20MΩ.

　　11. The voltage test of the instrument line and the housing is 500V.

　　12. The protective performance of the enclosure is splashproof.

　　13. The grounding resistance of the auxiliary probe does not affect the measurement when its resistance is not greater than the value specified in the table below.

　　14. Instrument generator handle rated speed of 120r / min.

　　Range Rp Rc

　　0 ~ 1Ω 500Ω

　　0 ~ 10Ω 1000Ω

　　0 ~ 100Ω 2000Ω

　　0 ~ 1000Ω 5000Ω