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The transimpedance amplifier TZA400 is designed for precise measurement of current, from pA to mA. The output is a voltage linearly proportional to the input current.
The gain of the TZA400 is controlled via a hard-wire interface on the back panel.
The TZA400 measures small currents e.g. optical power via a photodiode. Photodiodes are useful for power measurement in the visible and near infra-red due to their inherent sensitivity and speed of measurement.
Photodiodes produce a current which is proportional to the incident light power over a wide dynamic range.
The current is converted to a voltage through a precise transimpedance amplifier. This amplifier is very linear over the full measurement range of the device. The TZA400 has optionally 4 or 16 gain ranges. The switch is a semiconductor device, free from degradation.
The analogue output signal is available at the BNC connector on the front panel an on the appropriate line on the interface port on the back panel.
These transimpedance amplifiers are particularly useful for the measurement of current from photodiodes. The output is a voltage linearly proportional to input current and thus, to input power in photodiode monitoring applications. The fast response time at high signal-noise ratio makes the TZA400 series particularly useful in systems control feedback loops.
These amplifiers have a particularly high sensitivity and large dynamic range. There are 16 gain ranges covering 5 decades of gain in a 1-2-5 pattern. The gain-to-gain accuracy of <1% allows confident measurements of power curves over the full range of sensitivity of the device: 6½ decades of measurement range. Thus even very demanding measurements such as the accurate and high speed, real-time determination of polarization extinction ratio becomes a simple task.
The TZA400 series is insensitive to electromagnetic interference by design, an important factor when working in „dirty“ industrial environments. These units are provided in a modular 19“ rack mount system.
| Parameter | Conditions | Min | Typ | Max | Units | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Input | ||||||||||
| Current ranges (full scale) | Maximum range | 3.7 | mA | |||||||
| Minimum range | 37 | nA | ||||||||
| Noise equivalent current (NEPRMS) | Range: 3.7mA | 2.5 | µA | |||||||
| Range: 37nA | 500 | pA | ||||||||
| Connectors | BNC (Adapters for other connector systems available) | |||||||||
| Output | 0 | 3.7 | V | |||||||
| Function | Linear analogue : Vout = scale factor x Iin | |||||||||
| Connectors | BNC (Adapters for other connector systems available) und DB25 | |||||||||
| Output scale with 16 range option, range: | 3.7mA 1.85mA 740µA 370µA 185µA 74µA 37µA 18.5µA 7.4µA 3.7µA 1.85µA 740nA 370nA 185nA 74nA 37nA | 1 2 5 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 0.01 0.02 0.05 0.1 | V / mA V / mA V / mA V / µA V / µA V / µA V / µA V / µA V / µA V / µA V / µA V / µA V / nA V / nA V / nA V / nA | |||||||
| Output scale with 4 range option, range: | 3.7mA 370µA 37µA 3.7µA | 1 0.01 0.1 1 | V / mA V / µA V / µA V / µA | |||||||
| Output range (full scale) | 10 | V | ||||||||
| Rise / Fall time (10% – 90%) | Source capacitance < 100pF | 1 | µs | |||||||
| Setting time (1%) | Source capacitance < 100pF | 2 | µs | |||||||
| Accuracy | ± 1 | % | ||||||||
| Output impedance | 50 | Ω | ||||||||
| Logic | ||||||||||
| Current required for switching | HI = 5V LO = 0V | -100 | 5 0 | 100 | nA | |||||
| Dead time during change of range | 2 (Limited by setting time. The logical switch is complete within 20ns.) | µs | ||||||||
| Power supply | ||||||||||
| Type | Wall plug (supplied) | |||||||||
| Dimensions | ||||||||||
| 1 channel | 103 x 45 x 116 (w x h x l) | mm | ||||||||
| 4 channels | 103 x 106 x 116 (w x h x l) | mm | ||||||||
| 19″- rack modules | 3U | |||||||||
None.
