ZX74、 75, 76, 77 type DC resistors

Description:
A DC resistor is a variable resistance measuring tool. The switches used in resistors are sealed, do not require cleaning, have low contact pressure, long lifespan, and low voltage transformation. It can be used for measurement and other experiments in factories, schools, and research institutions, as well as for precise adjustment of resistors and known resistance values in DC circuits, and for whole machine calibration of portable DC single arm bridges and resistance thermometers.

Main technical performance

1. Range of resistance adjustment for resistors:

2. The residual resistance and tolerance of the resistor are:

When all six stepper disks of ZX74 are at zero position, the Ro resistance is 0.1 Ω;  
The zero position resistance value Ro of ZX75 is the smallest step value (0.01 Ω), which is convenient to use because the zero position resistance is an integer value.  
ZX76 and ZX77 are: Ro=(10 ± 5) m Ω

4. Reference power, nominal and ultimate power of resistors:

5. Dimensions: 440 × 130 × 120 (mm)
6. Quality: ZX74 (3.5kg); ZX75（3.5kg）； ZX76（4kg）ZX77（4.5kg）