4721 High Resistance High Voltage Resistor Box Decade.
The Model 4721 decade box is designed for the checking and calibration of insulation 
testers at voltages of up to 5000V DC.

The total range covered is from
1 kΩ to 1TeraΩ using specially selected
resistors and a high quality switch mounted
on an easy to read panel. 

This resistance box is housed in a
strong aluminum case with lid and carrying
handle to provide an ideal solution to on-site
and laboratory calibration of high resistance
insulation testers. 

The instrument can be supplied complete with a calibration certificate provided by our own in-house calibration laboratory. 

Switch Settings	Max d.c. Volts	Accuracy	Temperature Coefficient
1kΩ	10V	0.1%	0.015%/°C
10kΩ	50V	0.1%	0.015%/°C
100kΩ	150V	0.1%	0.015%/°C
1MΩ	300V	0.1%	0.025%/°C
10MΩ	500V	0.1%	0.05%/°C
100MΩ	1000V	1%	0.1%/°C
1GΩ	5000V	1%	0.1%/°C
10GΩ	5000V	1%	0.1%/°C
100GΩ	5000V	1%	2%/°C
1TΩ	5000V	1%	2%/°C
Overall Range	1 kΩ to 1 TΩ in 10 steps with open circuit on eleventh position.
Accuracy Stated at 23°C±1°C 10 to 50%RH
Earthing	Metal earth terminal on switch panel.
Connections	Plug-in shielded plugs with 1 meter shielded cable (2 off High and Low)
Dimensions	approximately  220 x 110 x 90 mm
Net Weight	approximately 0.8kgm.