A400D
Dual Channel High Voltage Linear Amplifiers
- Category: Dual Channel High Voltage Linear Amplifiers
- Manufacturer: Pendulum Instruments
- Channels: 2 (two independent A400 amplifiers sharing ground and power supply)
- Fixed gain: ×20
- Output voltage range: −200 V to +200 V (bipolar)
- Output current: 150 mA (current limiting included)
- Data sheet: Download PDF
- External link: Official product page
Overview
The Pendulum Instruments A400D dual-channel high voltage linear amplifier holds two mutually independent A400 amplifiers in one enclosure, sharing one ground reference and an internal power supply, which makes system integration simpler. A fixed gain of ×20 with a bipolar ±200 V output raises any signal source of up to ±10 V to the voltage the experiment needs, driving piezo actuators, MEMS devices, organic light-emitting diodes (OLED) and liquid crystal devices. Bandwidth reaches DC to 1 MHz at a 100 Vpp output and DC to 500 kHz at maximum output, with a slew rate of up to 400 V/µs for waveform fidelity at high frequency. The output has current limiting protection (150 mA) and the input a 15 mA microfuse that opens automatically when the input voltage exceeds 300% of its rating, protecting the measurement equipment downstream. The A400D is widely used for high voltage functional test in research institutes, R&D laboratories and manufacturing.
Key features
- Fixed gain ×20 bipolar high voltage output — A fixed gain of ×20 and an output voltage of ±200 V turn a standard signal source directly into a high voltage drive signal, with no gain setting to adjust.
- Two channels integrated in one box — The enclosure holds two independent A400 amplifiers sharing a ground reference and power supply, saving rack space and simplifying the wiring of a multi-channel test system.
- DC to 1 MHz bandwidth with a high slew rate — Bandwidth reaches DC to 1 MHz at a 100 Vpp output with a slew rate of 400 V/µs, keeping high-frequency high voltage waveforms intact.
- Twofold overload protection — The input carries a 15 mA microfuse that protects automatically when the input voltage exceeds 300% of its rating; the output has current limiting (150 mA) to prevent short-circuit damage.
- Very low output impedance — An output impedance below 0.1 Ω drives capacitive loads such as piezo actuators and liquid crystal devices effectively, holding the output voltage quality steady.
- Broadly applicable to high voltage drive — Suited to piezo actuators, MEMS, OLED, liquid crystal devices and any R&D laboratory or manufacturing test environment needing a high voltage signal.
Typical applications
- Driving piezo actuators and nanopositioning systems — A piezo actuator needs a linear high voltage signal at the ±200 V level yet is extremely sensitive to noise and non-linearity. An R&D engineer feeds a low-amplitude arbitrary waveform generator (±10 V output) into the A400D and gets an accurate high voltage drive signal amplified 20 times, for closed-loop control of optical scanning stages, ultrasonic transducers and precision positioning stages — without buying a dedicated piezo controller.
- Electrical characterisation of MEMS, OLED and liquid crystal devices — MEMS sensors, OLED pixels and liquid crystal light modulators need broadband (DC to 1 MHz) high voltage signals during development to measure I-V characteristics, switching speed and dielectric performance. The A400D's two independent outputs can apply different high voltage biases to the two electrode sets of a device at the same time, and with an oscilloscope or impedance analyzer a complete electrical characterisation is possible.
- Differential push-pull drive of electro-optic modulators and liquid crystal cells — Devices such as electro-optic (EO) modulators and liquid crystal cells need symmetrical differential high voltage drive to suppress common-mode interference and improve signal-to-noise ratio. The two A400D channels share a ground reference, so an engineer can feed one source into both channels and invert one of them, forming a push-pull output equivalent to ±400 V peak-to-peak — meeting a high voltage differential drive requirement without buying a higher-specification single-channel amplifier.
Key specifications
Key specifications for A400D, as published by Pendulum Instruments. For the full datasheet or a customized configuration, please get in touch.
| Channels | 2 (two independent A400 amplifiers sharing ground and power supply) |
|---|---|
| Fixed gain | ×20 |
| Output voltage range | −200 V to +200 V (bipolar) |
| Output current | 150 mA (current limiting included) |
| Bandwidth (100 Vpp output) | DC to 1 MHz |
| Bandwidth (maximum Vpp output) | DC to 500 kHz |
| Slew rate | 400 V/µs |
| Input voltage range | max. ±10 V (recommended working range ±7.5 V) |
| Input impedance | 1 MΩ (30 pF) |
| Output impedance | <0.1 Ω |
| Power supply | 100 V, 110 V or 220 V, 50/60 Hz (a version with a 110/220 V selector switch is also available) |
| Dimensions (W x H x D) | 257 × 102 × 262 mm, weight 4 kg |
Frequently asked questions
Yes. KanTek Technology is the authorized Taiwan distributor for Pendulum Instruments, supplying new A400D instruments with factory quotations and technical advice.
Instrument rental is launching soon. A400D is part of the line-up being prepared, and advance enquiries are welcome.
Yes. KanTek provides calibration and repair for A400D, with calibration performed by a partner laboratory, to keep the instrument accurate and available.
Use Request a quote on this page, or call +886-2-2999-7719. KanTek replies within 24 hours with pricing, lead time and the options that suit your application.
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