Pendulum Instruments · Dual-Channel High-Voltage Linear Amplifiers
A800D
Lab-grade dual-channel high-voltage wideband linear amplifier, fixed ×100 gain, bipolar ±400 V output
The A800D is the lab-grade dual-channel high-voltage model: ±400 V (800 Vpp) per channel, 60 mA continuous, about 30 W per channel, fixed ×100 gain, and about 300 kHz bandwidth at the full 800 Vpp swing. It is the highest-voltage dual-channel unit in the series and suits two high-voltage, low-current loads: paired electrostatic transducers, two-axis long-travel piezo positioning, and test setups that need two independent 400 V outputs. If what you need is 1600 Vpp differential across one load, the A800DI with its built-in inverter is the right model.
Overview
Once the voltage reaches ±400 V per channel, every design trade-off becomes visible. Current falls to 60 mA continuous, because high voltage and high current cannot both fit in a fixed power budget; bandwidth at the full 800 Vpp swing is about 300 kHz, because a full-scale swing needs more current to charge and discharge a capacitive load. Together these numbers define the loads it serves: high-impedance, low-capacitance devices where voltage matters more than current. Electrostatic transducers are the typical case, as is static and low-frequency positioning of long-travel piezo stacks. The ×100 gain lets a small-signal controller output drive both channels directly, and the built-in current limit acts on each channel separately, so an overload on one does not disturb the other. Both channels share supply and ground, so the common-mode relationship is fixed, which suits high-voltage drives that need two outputs precisely aligned. When you ask us for a quote, bring two numbers: load capacitance and highest operating frequency. They set the current demand, and current is the real limit on this unit.
Key specifications
| Output voltage (per channel) | ±400 V (800 Vpp) |
|---|---|
| Output current (per channel) | 60 mA maximum (continuous), built-in current-limit circuit |
| Output power (per channel) | About 30 W |
| Voltage gain | 100× (fixed) |
| Bandwidth | DC to about 300 kHz (at the full 800 Vpp swing) |
| Slew rate | ca 500 V/µs (no load); about 160 V/µs (rising) / 100 V/µs (falling) with a 300 pF load |
| Input voltage | ±4 V nominal; up to ±10 V accepted (not recommended for prolonged use) |
| Input impedance | 1 MΩ ∥ 30 pF (custom values on request) |
| Output impedance | <0.1 Ω (in the linear range) |
| Max capacitive load | 300 pF |
| Power supply | 100 V / 120 V / 230 V, 50/60 Hz (set at the factory); chassis fuse 2 A (slow-blow) |
| Operating temperature | 0°C to 30°C |
| Dimensions (W × H × D) | 257 × 102 × 262 mm |
| Weight | 4 kg |
Features
Highest voltage of the dual-channel models
±400 V, 800 Vpp per channel, with both high-voltage outputs available at once.
Built for high-impedance loads
60 mA continuous is the price of the voltage; it suits electrostatic transducers and low-capacitance devices.
Independent current limiting
Acts per channel, so an overload on one output does not pull down the other.
Shared ground
The common-mode relationship is fixed; precisely aligned high-voltage drives are not upset by potential differences between instruments.
Size it by capacitance and frequency
Those two numbers set the current demand, and current, not voltage, is the practical limit here.
Worldwide mains, compact size
Factory-set for 100/120/230 V and only 4 kg, so multinational labs and portable setups need no extra power arrangements.
Typical applications
Piezo actuation
Synchronized two-axis piezo actuator drive
Precision stages, optical scanners and nanoimprint tools often need ±400 V applied to two piezo actuators at the same time. The two independent A800D channels share ground and supply, so one enclosure drives X and Y together without the ground-loop trouble of two separate amplifiers, keeping waveforms matched and timing aligned.
MEMS characterization
MEMS device characterization and drive
During MEMS sensor and micro-actuator development, engineers excite the device with high-voltage signals from DC to a few hundred kHz while the second channel supplies bias or differential excitation, then study frequency response and nonlinearity. With up to 500 V/µs slew rate and 300 kHz bandwidth, the A800D reproduces an arbitrary waveform generator output at ×100 and drives the device directly.
Display materials
Evaluating liquid-crystal and OLED panel drive behavior
Display materials and process labs evaluating LC alignment, OLED emitter layers or electrochromic materials need a programmable bipolar high-voltage AC source. The A800D's linearity keeps the drive waveform free of distortion, and the two channels can apply different frequencies or amplitudes so two samples are compared in one measurement, shortening material screening.
Options and configuration
Tick the options you need; we collect them into a configuration list and carry it into the quotation form.
Standard equipment (included)
Model upgrades
Extended warranty and calibration
Downloads
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