Driving the future of technology : Original solution in measurement and control

The operation range of the HSA series is four quadrants as shown in the figure on the right.
Current sources and sinks regardless of positive or negative output voltage.
When an AC voltage is applied to a load including capacitors and coils, current returns from the load.
In this case, a typical AC power supply or amplifier may not be able to drive the load.
The HSA series operates stably not only with capacitive loads such as a piezoelectric element or solenoid but also with inductive loads because of its 4-quadrant output.

When AC power is applied to a capacitor or inductor, the AC current of these loads create a 90°phase difference with the applied AC voltage, but when the instantaneous values of voltage and current are plotted on a 4-quadrant graph, they pass through all four quadrants.
When applying alternating current to capacitors and inductors in this way, a 4-quadrant operation is necessary.
On the other hand, a general DC power supply can only be driven in the first and third quadrants on the graph, therefore it is not suitable for driving anything but resistive loads.

Set seamlessly by combining selectable fixed gain ×1,×10,×20,×50　and variable gain x1 to x3 ( fine adjustment potentiometer)
With a gain ×1 setting, it is used as a buffer amplifier that outputs at the same voltage as the external signal generator setting.

With the [INVT] switch on front panel, an amplification can be selected which the input and output phases are in the same or opposite polarity.
Balanced connection by two units of HSA series with output polarity set to opposite, the output voltage and power are doubled.

The output of the signal generator is divided and input to HSA −1 and. HSA −2 has a reverse phase output towards HSA −1.
And the load must be isolated from ground potentials and signal sources. And it is also called BTL(Balanced Transformer Less) connection.

Superimpose a DC bias voltage (up to ±75V) on the output voltage.(Setting by 10-turn indicating dial)
As a test in which the DC voltage of the load fluctuates, it is possible to superimpose the AC voltage on the DC voltage.

Set the rated DC voltage of the load with the DC bias of the HSA and superimpose the AC voltage output from the signal generator.
It is also possible to sweep the frequency of the AC output from the signal generator or superimpose it on white noise.

Capacitor MLCC

The demand for multi-layer ceramic capacitors (MLCCs) has been rapidly increasing for mobile devices, automotive devices and industrial devices. And their capacity has become larger and larger while they're downsizing at the same time.
The capacitance of the MLCC depends on the frequency and voltage, and the characteristics are evaluated with an impedance analyzer that applies voltage while sweeping the frequency.

Motor Ultrasonic motor

In combination with a signal generator, the frequency, phase and amplitude can all be adjusted to test drive the motor.
The voltage output is stable over a wide frequency band, and the best drive conditions for the motor are verified.
Recently, an ultrasonic motor driven at 100kHz or higher is also developed.

● Applications
Autofocus of single-lens reflex camera, scanning electron microscope(SEM), semiconductor manufacturing equipment, Micromachine manufacturing equipment, etc.

Magnetic material Magnetic powder core, Ferrite core

For magnetic materials, new materials that do not contain rare earth elements are being actively developed.
Particularly, the magnetic powder core has good magnetic characteristics in the high frequency bandwidth of 1 kHz or higher. Magnetic powder cores are manufactured by processing and molding powder with characteristics such as excellent flexibility in shape and high manufacturing yield, and their applications to various types of components are being considered.
HSA42011 is used for B-H curve measurement to evaluate magnetic materials.

Piezoelectric element Actuator, Transformer

The low output impedance of the HSA series provides good step response even when driving a piezoelectric element with a large capacitance.
Combined with an impedance analyzer to measure the resonance characteristics under actual driving conditions.

● Applications
Ultrasonic cleaning (parts, semiconductors)
Ultrasonic processing (wire bonders, plastic wells, atomizers, etc.)
Medical equipment (ultrasound diagnostic equipment, catheters, electric scalpels, etc.)
Underwater oscillator
Ultrasonic sensor
Small fine movement actuator (cantilever), etc.

Smartphone, Touch panel

Verification of device malfunction due to external noise

Mobile devices such as smartphones may malfunction due to common mode noise or noise from the AC adapter.
Also, capacitive touch panels that are widely used in factories use weak changes in capacitance as signals, but they may malfunction due to ambient noise. To verify these malfunctions, a test is performed in which alternating current is superimposed on direct current.
The HSA series superimposes a broadband harmonic noise simulation signal up to 1MHz.

■ Example of test waveform

The voltage level set by the signal generator can be output by setting the gain to 1x.
Output noise is 3.68 Vrms or less, and low noise digital circuits can be tested.

Vehicle Electrical Components

High voltage of EV power supplies

The shifting to electric vehicles worldwide had made EV development more active. Vehicle power supply tend to be higher in voltage, and vehicle electrical components are also required to have power fluctuation at higher voltage.
In some cases, a high-speed bipolar power supply is required for high-frequency voltage fluctuation tests.

Dielectrophoresis (DEP)

Cell separation, Detection of microorganisms and viruses

Dielectrophoresis is a phenomenon in which dielectric particles migrate due to the particles and surrounding medium in a non-uniform electric field.They're usually applied to biomolecule measurement.
In many cases, a high AC voltage is applied at a frequency around 1MHz.
A bacterial detection method that combines dielectrophoresis and impedance measurement has been studied.