Bipolar Amplifiers (Via External Signal Input) DOP series

* Models with voltage, current, or frequencies not listed here are also available. Please contact the nearest sales office.

Protections

OVP (Overvoltage protection)

DOP series is equipped with overvoltage protection, which protects load by limiting voltage up to approx. 110% of the rated output voltage even at abnormal conditions.

* -LVc option (output voltage limiter) enables control of the output in 0 to approx. 110% range.

OCP (Overcurrent protection)

DOP series is also equipped with overcurrent protection, which protects power supplies and load by limiting current up to approx. 110% of the rated output current.

* -LCc option (output current limiter) enables control of the output in 0 to approx. 110% range.

High speed overcurrent protection

DOP series is provided with 2 types of overcurrent protections, high-speed overcurrent protection to limit the pulse current, and standard overcurrent protection to limit the static current.

The standard overcurrent protection limits the static current, responding at around 1 ms. Additional high speed overcurrent protection can limit the pulse current of square waveforms or from capacitor at approx. 2 times more current of rating.

Output range

DOP series is a bipolar power supply that can perform four quadrant operations. They can supply (source) and absorb (sink) current in the field of the drawing on the right.

CV/CC setting selection

Use of BIAS

For details, download the datasheet below.

-LCc

Output current limit

Variable from 0 to approx. 110% with front panel dial

-LF

Floating ground (withstand voltage 200 Vdc)

-LMsm, -LMss

Master/slave control (parallel operation)

Maximum three units, including the master unit, are hooked. "-LMsm" for the master unit and "-LMss" for slave units. Please order the required number of units.
Every master unit and slave unit is exclusively used, but operating individually is also available. If you want to change the master-slave combination, it will need to be readjusted at our factory.

-LN

Output state auto-recovery (former: no power failure protection)

This option retains the output state when recovering from an input power interruption, such as an AC power switch ON/OFF or a power failure. Therefore, there is no need to reset the protection status by turning off the OUTPUT switch once.
Caution: If you turn on the power while the OUTPUT setting is ON, the output will be ON.

-LPr

rms display

-LVc

Output voltage limit

Variable from 0 to approx. 110% with front panel dial

-L(220V)

200 Vac to 240 Vac ±10% single phase, 50 Hz/60 Hz input

(150 W models and 300 W to 350 W models only)

Accessories

Function Generator

For details, download the datasheet below.

Characteristic of amplifier

Rise time

(Stepping time): The response time is sometimes described by the rise time (as shown in the drawing on the right).
The rise time of an amplifier at a response speed of (= frequency bandwidth)
Fc (Hz) is generally acquired by "tr ≒ 0.35/fc."
Fall time tf is the same as tr.
Frequency bandwidth
: at 30 kHz or lower, tr = tf = around 12 μs
: at 20 kHz or lower, tr = tf = around 18 μs

Response speed

When accurate output waveforms are required, select an amplifier with a frequency bandwidth higher enough than the operating frequency. In the case of using sine waves, 3 times to 5 times more frequency bandwidth is required, and around 10 times more in the case of square waves in general. Inadequate bandwidth causes not only a decrease in the output amplitude but much difference between the input and output phases. Therefore, operating the product while monitoring the actual output waveforms is recommended.

Inductive load

Some inductance of inductive load may cause resonance in CC mode.
In such cases, connect a C-R series circuit between output terminals to prevent resonance.

Capacitive Load

When a capacitive load is more than 100 pF (including a stray capacitance of output wire), the resonance in the output may occur. In that case, install 100 Ω (at 0.1 μF) to 1000 Ω (at 1000 pF) of high-voltage resistance in the output in series. Please note that the frequency band is limited when using an amplifier with a capacitive load, as shown in the formula on the right.
In addition, when an amplifier is used for a corona discharge, a current higher than its rating will flow, affecting the amplifier badly. In this case, as well as when using an amplifier with a capacitive load, please install the output resistance and limit the current.

* Please avoid continuous input of the high-frequency signal, which reduces the output frequency of an amplifier. An amplifier will break because of an increase in internal loss.

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