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dmohns committed Jan 22, 2024
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2 changes: 2 additions & 0 deletions docs/hardware/pcb_design.md
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Expand Up @@ -60,12 +60,14 @@ Magnetic latching relay is used in place of electromagnetic relay due to cost,
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reliability, power consumption, size. Comparison table is highlighted below.

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| Electromagnetic relay | Magnetic latching relay|
| -------- | -------- |
| Terminal is susceptible to arching and carbon which eventually lead to relay failure. | Terminal is less susceptible to arching and carbon which eventually leadtorelay. |
| High cost in comparison to current handling capability. | Low cost in comparison to current handling capability. |
| Takes a lot of space. | Takes a very small considerable space. |
| Continuous supply power is needed to keep relay active | A single pulse of power is only needed to trigger the relay on or off. |
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The above advantage of magnetic latching relay as compared to electromagnetic relayin terms of **cost, size, terminal carbonizing, power consumption and current
handling capability** is why we opted for a magnetic latching relay as opposed to using an electromagnetic relay.
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4 changes: 4 additions & 0 deletions docs/hardware/product_specification.md
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Expand Up @@ -35,6 +35,7 @@ Enter 20-digit token via keypad available on meter, the token is generated from

## Technical Parameter

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| DESCRIPTION | SINGLE PHASE VALUE |
| -------- | -------- |
| Accuracy | CLASS 1 |
Expand All @@ -46,13 +47,16 @@ Enter 20-digit token via keypad available on meter, the token is generated from
| Communication Interface | DLMS / COSEMCompliance (GPRS) First Electric web API |
| Dimension | 18cm x 15cm |
| Display: | LCD 16x2 |
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### Indicator

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| Indicator | Description |
| -- | -- |
| Credit Indicator | Bi-color LED (red) <br> Green LED light on when credit is in highlevel <br> Red LED light on when credit is low <br> Red LED blinks when credit has finished |
| Alarm indicator | The indicator blinks when event occur, event such as overload, low voltage, low credit or credit exhausted. |
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## Communication devices

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