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DECADE
RESISTANCE BOXES |
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Portable 9 Decade High Voltage High Resistance Box Model 4720
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4720 Resistance
Decade, High Voltage, High Resistance.
Designed for the checking and calibration of insulation testers at
voltages of up to 5000V DC, the
Model 4720 decade box provides
up to 9 decades of resolution.
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The total range covered is from
1 kΩ to
611,111,110kΩ using specially
selected
resistors and high quality switches
mounted on an easy to read panel.
This resistance box is housed in a strong
reinforced polystyrene
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 611GΩ |
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Resolution
1kΩ |
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Voltage rating 5,000V DC |
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9 decades |
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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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Models Available
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| 4720 High Voltage Resistance
Decade Box 9 DECADES |
1 Kohm TO 611 Gohm |
| 4720.1 High Voltage
Resistance Decade Box 3 DECADES |
1 Gohm TO 611 Gohm |
| 4720.2 High Voltage Resistance
Decade Box 6 DECADES |
1 Kohm TO 1111 Mohm |
| 4720.3 High Voltage Resistance
Decade Box 6 DECADES |
1 Mohm TO 611 Gohm |
| 4720.4 High Voltage Resistance
Decade Box 9 DECADES |
1 Kohm TO 1 Tohm |
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Specifications
| Decade |
Value |
Accuracy |
Max. Power |
Max. V/Step |
Temp. Coeff |
| 1 |
l0 x 1kΩ |
±0.1% |
1Watt |
10 |
±15ppm/°C |
| 2 |
l0 x 10kΩ |
±0.1% |
1Watt |
50 |
±15ppm/°C |
| 3 |
l0 x 100kΩ |
±0.1% |
1Watt |
150 |
±15ppm/°C |
| 4 |
l0 x 1MΩ |
±0.1% |
1Watt |
300 |
±25ppm/°C |
| 5 |
l0 x 10MΩ |
±0.1% |
1Watt |
500 |
±50ppm/°C |
| 6 |
l0 x 100MΩ |
±1.0% |
2.3Watt |
1,000 |
±100ppm/°C |
| 7 |
l0 x 1GΩ |
±1.0% |
3.5Watt |
5,000 |
±100ppm/°C |
| 8 |
l0 x 10GΩ |
±1.0% |
3.5Watt |
5,000 |
±100ppm/°C |
| 9 |
5 x 100GΩ |
±2.0% |
1.3Watt |
5,000 |
±2,000ppm/°C |
| Dimensions |
46cm x 38cm x 16cm |
| Weight |
8.8Kg |
Accessories
A4720-1 10: Pair high voltage connecting leads fitted with
suitable plugs at one end for connection to the Decade Box.
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