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DECADE
RESISTOR BOXES |
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Single, High Resistance Decade Box Model 4721
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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.
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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.
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| Calibration
of insulation tester |
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Range 1kΩ
to 1TΩ |
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Voltage rating up to 5,000V DC |
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Portable field or laboratory use |
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The
instrument can be supplied complete with a calibration certificate
provided by our own in-house calibration laboratory.
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| 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. |
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