ZX21、ZX21a DC Resistance BoxPrecision adjustable resistors for DC circuits, featuring low residual resistance, are essential instruments for electrical laboratories in factories, schools, and research institutions. Multi-value resistors can also serve as testing instruments for temperature indicating gauges and temperature indicating regulators. ZX21aIsZX21The improved model features a stepping disk with a low-pressure switch contact, resulting in small resistance and stable variation.
DC Resistance Box Main Technical Performance
1.Resistor adjustment range:ZX21：9×(0.1+1+10+100+1000+10000)Ω 
                                 ZX21a：10×(0.1+1+10+100+1000+10000)Ω
2Power: Reference Power0.2WNominal Power0.3WUltimate Power0.5W
3.Accuracy

4.DC Resistance Box Dimensions:ZX21：  180×130×115(mm) 
                                          ZX21a： 200×135×75(mm)
5.Quality: Less than2kg