As shown in the figure below, the principle of parallel plate capacitor is applied to the PS sensor. Suppose the electrostatic capacitance between the center electrode and the target is “C”, the inductivity and distance between probe and the target are “ε” and “g,” and center electrode surface area is “A”, then, electrostatic capacitance can be calculated by the following formula:
In addition, by using constant current power supply as shown in the figure, output voltage, calculated by the following formula, will be relative to the distance between the sensor and the target object:
To achieve high linearity, parallel electric field is obtained at the center of electrode by equalizing the electric potential level of guard electrode and the center electrode.
Amplifier specifications｜Standard probe｜External Dimension｜PS-Ⅲ Order number
The PS-Ⅲ is equipped with various features like one-touch zero reset function, NEAR/FAR LED display, and multichannel operability, and it can be used for wide variety of applications.
| Amplifier specifications | |
| Model | PS-Ⅲ |
|---|---|
| Standard range of voltage output | 0 to 10V |
| Output terminal | BNC connector |
| Frequency characteristic | DC to 1kHz |
| Operating temperature range | 10 to 40℃ |
| Operating voltage | AC100V (with supplied AC adapter) |
“□□” in the chart will be filled with probe length (mm)
| Model | Outer diameter (mm) | Offset (μm) | Range (μm) | Resolution (nmrms) | Linearity (%) | Probe length (mm) | Cable length (m) |
|---|---|---|---|---|---|---|---|
| AX□□-30 | 4 | 10 | 30 | 0.6 | ±0.05 |
5 10 30 |
2 (standard) |
| AX□□-50 | 10 | 50 | 1.0 | ||||
| AX□□-100 | 10 | 100 | 2.0 | ||||
| AY□□-50 | 6 | 10 | 50 | 1.0 | |||
| AY□□-100 | 10 | 100 | 2.0 | ||||
| AY□□-250 | 25 | 250 | 5.0 | ||||
| AY□□-500 | 50 | 500 | 10 | ±0.1 | |||
| AZ□□-500 | 12 | 50 | 500 | 10 | ±0.05 |
10 30 |
|
| AZ□□-1000 | 100 | 1000 | 20 | ±0.1 |
| External Dimension | ||||
| Model | PS-Ⅲ-3N | PS-Ⅲ-2D | PS-Ⅲ-5N | PS-Ⅲ-4D |
|---|---|---|---|---|
| Output terminal | BNC×3 | BNC×2 | BNC×5 | BNC×4 |
| Dimensions(mm) | 186W×152H×331D | 257W×152H×271D | ||
| Indicator | No | Yes | No | Yes |
| PS-Ⅲ ordering number | ||||
| Amplifier model | Number of channels | Indicator | ||
|---|---|---|---|---|
| PS-Ⅲ | 2 or more | With indicator・・・D | ||
| Without indicator・・・N | ||||
| In case 4 channel indicator is required | ||||
| PS-Ⅲ | – | 4 | D | |
Malaysia
