DOS Series
Ultra fast response Four-quadrant bipolar power supplies
Ultra fast response four-quadrant bipolar power supplies
DOS series are four-quadrant bipolar power supplies with ultra high-speed response of DC to 200kHz(CV mode). It shall output various waveforms including sinusoidal, triangular, saw-tooth, rectangular and more with combination with a function generator. As DOS series amplifies any waveform, it is suitable for all sorts of simulation tests. Sourcing and sinking of electrical power with four-quadrant operation as well as 2 operation modes of CV (constant voltage) and CV (constant current) is possible. Compact size for such various function and ultra high-speed response power supply. In addition, the features of large meters with high visibility and superior operability make the DOS series versatile four quadrant bipolar power supply which can be used a wide variety of occasion from in laboratory to production line.
Features
Ultra fast response
Suitable for transient response test because of its ultra high-speed response DC to 200 kHz and high power, maximum 2000 W.
Four-quadrant action
DOS Series can be used both as a high speed response DC power supply and as a DC electronic load.
DC bias
10-turn potentiometer to be used as the output setting volume when used as the DC power supply and as the bias setting dial at outputting AC waveform is equipped.
CV (constant voltage) / CV (constant current)
A single switch selects between CV and CC modes.
Compact & light weight
For maximum compactness and light weight, DOS Series has been improved for small footprint and handiness.
DC output meter equipped
3-digit digital meter displays the DC value of the output voltage and current.(The option of rms indication is available.)
Complete protective functions
Protective functions against over voltage/current and against output short-circuit are completely provided.
Master-slave
Master / Slave control(option) for more power requirement. Both of Master unit and Slave unit are usable as individual amplifier. (Frequency response will vary in case of master / slave operation, please ask sales staff.)
Applications
Inductive load such as coil and transformer
Various motor tests
Evaluation test for solar panel related devices
Ripple test of capacitors
Voltage regulation tests for in-vehicle electrical component
For surface treatment
Specification
Functions
Use of BIAS
When the "BIAS ON / OFF switch" is flipped to ON, bias output can be changed with the "BIAS setting dial." Bias voltage can be set when CV control mode, and Bias current can be set when CC control mode.
CV / CC setting selection
Inputting voltage via Vcon-in enables the control of output voltage V when CV control mode and output current A when CC control mode.
Use of BIAS
When the "BIAS ON / OFF switch" is flipped to ON, bias output can be changed with the "BIAS setting dial." Bias voltage can be set when CV control mode, and Bias current can be set when CC control mode.
CV / CC setting selection
Inputting voltage via Vcon-in enables the control of output voltage V when CV control mode and output current A when CC control mode.
Protective functions
OVP (Over voltage protection)
DOS series is equipped with over voltage protection, which protects load by limiting voltage up to 120 % of the rated output voltage even at abnormal conditions.
* It is possible to set variable 0% to 110% output voltage limit range in case -LVc option is taken.
OCP (Over current protection)
DOS series is also equipped with over current protection, which protects power supplies and load by limiting current up to 120 % of the rated output current.
* It is possible to set variable 0% to 110% output current limit range in case -LCc option is taken.
High speed over current protection
DOS series is provided with 2 types of over current protections, high speed over current protection to limit the pulse current, and standard over current protection to limit the static current.
The standard over current protection limits the static current, responding at around 1m sec.
Additional high speed over current protection can limit pulse current of square waveforms or from capacitor at approximately 2 times more current of rating.
Output range
DOS series is a bipolar power supply which can perform four-quadrant operation. They can supply (source) and absorb (sink) current in the field of the drawing on the right.
Options
-LN
No protection against blackout
-LF
Floating ground (Resistant to pressure 200 Vdc)
-LMs( )
Master-slave control*
-LPr
rms display
-LVc
Output voltage limit
Variable from 0 to approx. 110% with front panel dial
-LCc
Output current limit
Variable from 0 to approx. 110% with front panel dial
-L(220V)
200VAC to 240VAC ±10% single phase,50/60Hz input(150W and 300W models only)
*( ) shall be "m" for Master unit, or "s" for Slave unit.
-LMsm for Master, LMss for Slave.
Order required quantity for each unit. Master unit or slave unit are to be set at the factory, and if master to slave change is required after shipment, adjustment at the factory will be needed. Slave unit will also be able to operate by itself. Maximum 3 units including master unit can be connected.
How to Order When ordering, suffix the following option mark to the model number.
DOS25-12-LCcDFMsmNPrSVc(220V) (Alphabetical and input voltage order)
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 200kHz or lower, tr = tf = around 1.8 μs
: at 100kHz or lower, tr = tf = around 3.5 μs
Response speed
When accurate output waveforms are required, select a amplifier with a frequency bandwidth higher enough than the operating frequency.
In case of using sine waves, 3 to 5 times more frequency bandwidth is required, and around 10-times more in case of square waves in general. Inadequate bandwidth causes not only 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.
Capacitative load
Capacitative load may cause oscillation.
In such cases, placed a power resistance in series with the output.
Be careful that the frequency bandwidth is limited depending on the resistance and capacitance placed in series when capacitative load.
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.
