High-Speed Response Bipolar Power Supply with function generator
- Voltage range: ±20V to ±80V
- Current: ±5A to ±20A
- Power: 400W
- Ultimate in accurate programable operation
Four-quadrant bipolar power supplies are developed up to the following.
DOKF series are four-quadrant power supplies possible to source and sink current. It can be applied widely according to usage, from transient response tests to various evaluation tests. They realize a high-speed response of DC to 120 kHz (at constant voltage mode). The embedded function generator can generate basic waveforms, including sine waves, rectangular waves, and customized waves. That realizes a high-speed response of DC to 120 kHz (at constant voltage mode). The embedded function generator can generate basic waveforms, including sine waves, rectangular waves, and customized waves. And as it also provides the high-resolution sequence function as standard, you can program output patterns in detail. Moreover, as This bipolar power supply can make their generation of wave and set sequence all with the simplified operation on the front panel, you can easily use various functions.
Note: We have not designed this product to be charge and discharge batteries.
For battery charging and discharging applications, please refer to the Battery Cycle Tester product page.
Main features
- Superior visibility and operability by using color liquid crystal display.
- High speed of DC to 120 kHz is realized.
- Four-quadrant behavior able to source and sink current.
- It is possible to generate non-distortional waves such as sine waves and rectangular waves.
- It is possible to set and operate high-performance sequences in 1024 steps.
- There are 2 modes of DC and AC + DC and each of them can be set individually.
- 2 mode operation of CV (constant voltage) and CV (constant current) are applicable.
- It is possible to connect a maximum of 3 power supplies in parallel (synchronized trigger) by coinciding accuracy of frequency (synchronized clock) in synchronized operation.
- GPIB, USB and RS-232C interface are equipped as standard.
- It is possible to output voltage/current in 16 bits and customized waves of resolution of 1024 in one cycle. (optional control software)
Operation range
Applications
- To drive capacitive loads such as a capacitor.
- To drive inducible loads such as coils and transformers.
- Tests of various motors.
- Evaluation of solar cell/panel-related equipment such as solar inverters (PV inverters).
- Voltage fluctuation tests for automotive electrical components, etc.
Models
Please consult with us for specifications other than the below.
| Model | Output | Frequency Bandwidth (-3 dB) | |||
|---|---|---|---|---|---|
| Voltage | Current | Power | CV mode | CC mode | |
| DOKF20-20 | ±20 V | ±20 A | 400 W | DC to 120 kHz | DC to 60 kHz |
| DOKF40-10 | ±40 V | ±10 A | |||
| DOKF60-6.7 * | ±60 V | ±6.7 A | DC to 50 kHz | ||
| DOKF80-5 * | ±80 V | ±5 A | |||
* They are available in the near future. Please contact our sales staff for detail.
Functions
Basic Wave Generation Function
DOKF is equipped with a built-in function generator that produces basic waves such as sine, rectangular, and triangle waves. The frequency range can be set between 0.01 Hz and 120 kHz. Easy adjustments/editions of amplitude, initial phase (for sine wave), phase shift (for sine wave), and duty ratio (for rectangular/triangle wave) are possible. DOKF has a special feature of “soft start” and “soft stop” which enable to program of initial rise and fall characteristics of the output.
AC Volt/current sweep, frequency sweep
DC Volt/current ramp
Applications
Power activation test, various start-up tests of motor, etc, fluctuation test of the wave shape, and so on.
Sequence functions
DOKF is equipped with a sequence function that can program parameters such as step length, step amplitude ramp, DC voltage and current ramping, AC voltage and current ramping, frequency sweep, AC superposition, step jump, and jump times. These useful functions help to program the desired waves in a very flexible manner, resulting to support efficient laboratory and research works.
- Step setting length 0.1 ms to 1000 h (resolution of 0.1 ms)
- Maximum 1024 steps per program.
- Maximum 64 programs can be stored in memory for each CC/CV operation
- Program repeat can be set by “endless repeat” or “1 time to 10000 times”
- Multiple programs can be converted to activate
Sequence functions help to create complicated waves like the below to be simply and easily edited.
Applications
Test for motors, pulse power supply, and various evaluations.
Measurement functions
DOKF is equipped with a measurement function that can measure DC value, AC RMS value, and Max/Min value, likewise, it is possible to automatically measure wide range bandwidth from DC to 120 kHz. There are 4 parameters which are simultaneously displayable, each of these parameters are individually programmable. As this measurement is a standard feature, no option needs to be purchased. This sophisticated feature will reduce the time for editing output waves and bring up work efficiency.
Synchronized Operation
The following DOKF operations are available for up to three units.
Synchronous trigger
Through a single operation of the master unit, it is possible to match the output timing of ON/OFF in one or two slave units. In turning the output on, the output starting gap between the master and the slave is less than 0.5 μs
*To use this function, please purchase "Dedicated cable for synchronous trigger" of 2 meters separately.
Synchronous clock
By providing the clock input of 10 MHz, the individual difference between the oscillators installed on each unit is removed (In the case of this, there are a few ppm up to several tens ppm in general). What is more, frequency accuracy and sequence-step time are completely unified through the operation.
Moreover, the product is also available for setting the phase shift difference for the sine wave toward each unit.
(*Please prepare the coaxial cable on both ends of BNC connectors which is not included but required for the synchronous clock.)
*When the slave unit is required to synchronize in accordance with the waveform set by the master unit, -the LMs option must be taken (in master/slave control).
Note that the time synchronized operation is not available if using the master/slave control.
- Other functions:
- Protection function (Cut-off, Individually settable limiter protection), Key lock function, Switching CV/CC, and Memory function (up to 99) are installed as standard.
Operability
- Display: Display various settings and measurements.
- OUTPUT switch: ON/OFF for output
- Rotary encoder: Change value
- POWER switch: ON/OFF for main power
- CANCEL switch: Cancel settings
- ENTER switch: To confirm and key in
- CV/CC switch: Switchover CV/CC mode
- MEMORY switch: Switchover memory screen
- SETTING/STORAGE switch: Make to setting change menu, store memory
- PROTECTION switch: To switch the protection setting menu
- Shift up switch: Shift up each setting items
- Shift down switch: Shift down each setting items
- SEQUENCE switch: Use for switchover of sequence screen or interrupt or restart of sequence operation
- Shifting left switch: Shift digits of settings to left
- Shifting right/LOCK switch: Shift digits of settings to right and also use the key lock function
Specifications
Options
- -LCk
CC-Link interface board
- It enables digital remote control via the network of CC-Link.
- -LMsm, -LMss
Master/Slave control (parallel operation)
- Maximum 3 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 for exclusive use. If you want to change the master/slave combination, it will need to be readjusted at our factory.) (If you take this option, the synchronized operation is unavailable.)
- -LRa
The front panel becomes the panel attachable to the 19 inches rack of EIA or JIS standards.
- The front panel bracket becomes the panel attachable to the 19-inch rack of EIA and JIS standards.
(It is impossible to support the main unit only with these brackets. Please always utilize a sole plate or angle bars to support the unit weight.)
Accessories
AC input cable
| Standard | CABLE TYPE8 |  |
 |
125 V / 125 A | 2.5 meters Fixed length |
|---|---|---|---|---|---|
| Sold separately | CABLE TYPE3 | |
 |
250 V / 10 A | 2.5 meters Fixed length |
| Sold separately | CABLE TYPE4 | |
 |
250 V / 10 A | 2.5 meters Fixed length |
Please use appropriate AC cable.
Sequence software for power supplies
(PSS2en-DOKF)
This is the dedicated software to make the DOKF series activate sequence operation with simplified settings. Of course sequence operations of high speed and large storage capacity in the power supply, it can generate and output optional waves from the power supply.
(USB or RS-232C)
Dimensions
Tech Notes
Characteristics of amplifier
Rise time
(step time): responsiveness may be expressed with rise time. (see right figure)
Rise time for amplifiers in fc (Hz) of response time (= frequency band) is calculated with the following equation generally.
"tr ≒ 0.35/fc"
Decay time tf is equal to tr.
Frequency bandwidth
: to 120 kHz, tr = tf ≒ 2.9 μs
: to 60 kHz, tr = tf ≒ 5.8 μs
Response speed
When an accurate output wave is required, please select an amplifier in a sufficiently higher frequency band than the applied one. Generally, a speedy frequency band of 3 times to 5 times of applied frequency for a sine wave and 10 times for a rectangular wave is required. If the frequency band is in lacking, as not only is output oscillation reduced but also the phase difference of input and output becomes larger, consideration to apply it monitoring output wave is required.
For capacitive loads
In the case of capacitive load, oscillation may be caused. If so, please insert a power resistance to the output in the series.
And, in capacitive load, please attend that the frequency band is limited by the resistance and capacitance inserted in series.
For inductive loads
At CC mode, oscillation may be caused by the inductance of inductive loads.
If so, please connect the C-R straight circuit between output terminals so as not to cause oscillation.
Download
-
DOKF series Datasheet
Date: 2022-10-18 rev.09
PDF (2,546 KB)
-
Bipolar Power Supplies with Function Generator
Date: 2022-10-24 rev.02
PDF (6,953 KB)
-
DOKF series Instruction Manual
Date: 2022-9-1 rev0.9
PDF (2,327 KB)
-
DOKF series Instruction Manual (Communication Interface)
Date: 2022-3-3 rev.0.6
PDF (1,430 KB)
-
DOKF series USB Driver
Date: 2021-07-01 rev1.7.4
ZIP (6,774 KB)
The account registration is necessary for downloading
-
DOKF series Datasheet
Date: 2022-10-18 rev.09
PDF (2,546 KB)
-
Bipolar Power Supplies with Function Generator
Date: 2022-10-24 rev.02
PDF (6,953 KB)
-
DOKF series Instruction Manual
Date: 2022-9-1 rev0.9
PDF (2,327 KB)
-
DOKF series Instruction Manual (Communication Interface)
Date: 2022-3-3 rev.0.6
PDF (1,430 KB)
-
DOKF series USB Driver
Date: 2021-07-01 rev1.7.4
ZIP (6,774 KB)
In this website, we provide only the latest version of information including instruction manuals as of our products. Therefore, the newest versions of manuals on the website might be not same as the ones of products you purchased in the past.
