Post Office Box Plug Type
Product Code : EL-EAE-10285
The Post Office Box Plug Type from Lab Exports allows accurate measurement of resistance between 0.1 and 1,111,000 ohms using a DC battery, with the whole system contained in a superior quality wood box. The 4-Ratio P.O. Box has sixteen coils and two proportional arms, each with coils of 1, 10, 100 and 1000 ohms, and also incorporates an infinity gap, with two spring keys providing good contact for the battery and galvanometer. The 3-Ratio P.O. Box has sixteen non-inductively wound coils (1, 2, 2, 5, 10, 20, 20, 50, 100, 200, 200, 500, 1000, 2000, 2000, 5000 ohms) and two proportional arms, each with coils of 10, 100 and 1000 ohms. It is available in 3-Ratio and 4-Ratio configurations, with Manganin coil versions (12 mm and 14 mm thick rectangular brass block, ±0.05% accuracy) and Constantan coil versions (12 mm and 14 mm thick rectangular brass block, ±0.1% accuracy). Lab Exports manufactures and exports this box from India to schools, colleges and laboratories worldwide.
Specifications
| Attribute | Detail |
|---|---|
| Measurement Range | 0.1 to 1,111,000 ohms |
| 4-Ratio Configuration | 16 coils, two proportional arms (1, 10, 100, 1000 ohms each), infinity gap |
| 3-Ratio Configuration | 16 non-inductive coils, two proportional arms (10, 100, 1000 ohms each) |
| Manganin Coil Accuracy | ±0.05%, 12 mm/14 mm thick brass block |
| Constantan Coil Accuracy | ±0.1%, 12 mm/14 mm thick brass block |
| Housing | Superior quality wood box |
| Category | Physics Lab > Electrical And Electronics |
Key Features
- Wide measurement range: Accurately measures resistance from 0.1 to over one million ohms.
- Dual ratio configurations: Available in both 3-Ratio and 4-Ratio versions to suit different bridge measurement needs.
- Coil material options: Choice of Manganin (±0.05%) or Constantan (±0.1%) coils for different accuracy requirements.
Applications
This Post Office Box Plug Type is used in physics laboratories for precise resistance measurement using the Wheatstone bridge principle, in circuits with a DC battery and galvanometer.
Why Choose Lab Exports
Lab Exports is a manufacturer and exporter of physics lab equipment from India, supplying electrical and electronics apparatus to schools, colleges and laboratories worldwide. Browse the full Electrical And Electronics range or the complete Physics Lab equipment catalogue.
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- Resistance Box Plug Type
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- Decade Resistance Box, Dial Type
- Copper Voltameter
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Frequently Asked Questions
Q: What resistance range can this Post Office Box measure?
A: 0.1 to 1,111,000 ohms.
Q: What is the difference between the 3-Ratio and 4-Ratio versions?
A: The 4-Ratio version has proportional arm coils of 1, 10, 100 and 1000 ohms plus an infinity gap; the 3-Ratio version has proportional arm coils of 10, 100 and 1000 ohms.
Q: What coil material options are available?
A: Manganin (±0.05% accuracy) or Constantan (±0.1% accuracy).
Q: What is the housing made of?
A: A superior quality wood box.
Q: Does Lab Exports export this box internationally?
A: Yes, Lab Exports manufactures and exports physics lab equipment from India to schools, colleges and laboratories worldwide.
Request a Quote
To order the Post Office Box Plug Type, contact Lab Exports today.
