ZX79D+Megohmmeter standard resistor

The ZX79D+type megohmmeter standard resistor is designed and manufactured in accordance with the requirements of the National Metrology Verification Regulations of the People's Republic of China, JJG622-97 Insulation Resistance Meter (Megohmmeter).
1、 Purpose:
This resistor is mainly used for calibrating various megohmmeters and insulation resistance meters with a rated voltage of 5000V during production or repair. It is also suitable for checking or calibrating insulation high resistance meters and can be used as a standard high resistance box in other circuits.
2、 Characteristics
The components used in this resistor are all metal film resistors produced by Sino US joint ventures. After careful selection by our company, their resistors have the characteristics of low voltage coefficient, low temperature coefficient, and good stability.
2. In terms of internal structure, this resistor adopts the latest design of high-voltage resistant and high insulation lightweight conversion switch, which makes the instrument have the characteristics of clear file replacement and easy use.
3. This resistor adopts high insulation material and light pressure structure, therefore it has the ability to connect
The advantages of low contact pressure, long lifespan, reduced contact resistance, and high insulation resistance.
4. The entire resistor is housed within a metal casing, thus providing excellent electrostatic shielding
Cover up.
3、 Main technical indicators
1. Adjustable range: 0~121111.110M Ω, with a minimum step size of 100 Ω.
2. The level index and maximum operating voltage or current (i.e. reference voltage or current) of each decimal plate are shown in Table 1.

1. Adjustable range: 0~121111.110M Ω, with a minimum step size of 100 Ω.
2. The level index and maximum operating voltage or current (i.e. reference voltage or current) of each decimal plate are shown in Table 1.
3. Change the maximum operating voltage or current to 1/5 of the maximum operating voltage or current
The variation in resistance caused by changes in voltage or current should not exceed the corresponding level index.
4. Reference temperature for resistor: 23 ℃
Nominal operating temperature: 23 ± 5 ℃
5. This resistor is suitable for use in environments with an ambient air temperature of 23 ± 5 ℃ and a relative humidity of ≤ 80%.
6. Insulation resistance of the road to the shell: ≥ 1 × 1012 Ω.
7. The insulation strength of the circuit to the shell should be able to withstand a 50Hz sine wave voltage of 8000V without breakdown after a one minute test.
8. Instrument dimensions: 490mm × 249mm × 171mm.
9. Instrument weight:<15kg.