Operation manual
Programmable Switching Mode Power

Safety Precautions
This product complies with the requirements of the following directives of the European Union for CE conformity: 2014/30/EU (electromagnetic compatibility), 2014/35/EU (low voltage), 2011/65/EU (RoHS).
We herewith confirm that this product meets the essential protection standards, which are given in directions of council for adaptation of the administration regulations for UK of Electromagnetic Compatibility Regulations 2016 and the Electrical Equipment (safety) regulations 2016.
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To ensure safe operation of the equipment and eliminate the danger of serious injury due to shortcircuits (arcing), the following safety precautions must be observed.
Damages resulting from failure to observe these safety precautions are exempt from any legal claims whatever.
- Do not use this instrument for high-energy industrial installation measurement.
- Prior to connection of the equipment to the mains outlet, check that the available mains voltage correspond to the voltage setting of the equipment.
- Connect the mains plug of the equipment only to a mains outlet with earth connection.
- Do not place the equipment on damp or wet surfaces.
- Do not cover the ventilations slots of the cabinet to ensure that air is able to ciculate freely inside.
- Do not insert metal objects into the equipment by the way of ventilation slots
- Do not place water-filled containers on the equipment (danger of short-circuit in case of knockover of the container)
- Do not operate the equipment near strong magnetic fields (motors, transformers etc.).
- Do not operate the meter before the cabinet has been closed and screwed safely as terminal can carry voltage.
- Replace a defective fuse only with a fuse of the original rating. Never short-circuit fuse or fuse holding.
- Check test leads and probes for faulty insulation or bare wires before connection to the equipment.
- Please use only 4mm-safety test leads to ensure immaculate function.
- To avoid electric shock, do not operate this product in wet or damp conditions. Conduct measuring works only in dry clothing and rubber shoes, i. e. on isolating mats.
- Never touch the tips of the test leads or probe.
- Comply with the warning labels and other info on the equipment.
- The measurement instrument is not to be to operated unattended.
- Do not subject the equipment to direct sunlight or extreme temperatures, humidity or dampness.
- Do not subject the equipment to shocks or strong vibrations.
- Keep hot soldering irons or guns away from the equipment.
- Allow the equipment to stabilize at room temperature before taking up measurement (important for exact measurements).
- Use caution when working with voltages above 35V DC or 25V AC. These Voltages pose shock hazard.
- Periodically wipe the cabinet with a damp cloth and mid detergent. Do not use abrasives or solvents.
- The meter is suitable for indoor use only
- Do not store the meter in a place of explosive, inflammable substances.
- Opening the equipment and service – and repair work must only be performed by qualified service personnel
- Do not place the equipment face-down on any table or work bench to prevent damaging the controls at the front.
- Do not modify the equipment in any way
Cleaning the cabinet:
Prior to cleaning the cabinet, withdraw the mains plug from the power outlet.
Clean only with a damp, soft cloth and a commercially available mild household cleanser. Ensure that no water gets inside the equipment to prevent possible shorts and damage to the equipment.
Precautions For Use
- The unit has a built-in Tracking O.V.P (Over voltage Protection) features. In the event of output voltage becoming 10% greater than the set value, the O.V.P. will be triggered and the output power will be cut off and >FAULT< warning appears.
When you get this warning , switch off the unit and remove all loading, switch the unit back on again and it should resume normal operation.
In the event this problem persists, the unit must be investigated by your agent. - This unit has a buzzer built inside. The buzzer will sound when over temperature/ overload/ over voltage has been triggered.
When you get this warning sound , switch off the unit and remove all loading.
Check your load and output settings.
Allow the unit to cool down for 30 minutes.
If you switch on the unit again, it should resume the normal operation.
In the event of this problem persists, the unit must be investigate by your agent.
Technical Specifications of Power Supplies
| Specifications | P 1890 | P 1885 |
| Output voltage | 1-20 V DC | 1-40 V DC |
| Output current | 0-10 A | 0-5 A |
| Rated Output Power | 200 W | |
| Ripple & Noise (p-p) | 30 mVp-p | |
| Load Regulation | 300 mV | 200mV |
| Line Regulation | 10 mV | |
| Input Voltage | 100-240 V AC, 50/60 Hz | |
| Max. Input Power | 285 W | |
| Power Factor | ³ 0,9 | |
| Display Meter | 4 digits – Display LCD Ammeter, Voltmeter and Power Meter | |
| Meter´s Accuracy | ( +/- 1% + 5 counts for range V < 5V, I < 0.5A), ( +/- 1% + 2 counts for range V ≥ 5V, I ≥ 0.5A) |
|
| LCD Dimension | 48 x 66 mm | |
| Cooling System | Thermostatic Control Fan | |
| Operating Temperature | 0- 40°C | |
| Operating Temperature | -Tracking OVP (Over Voltage Protection), -Current Limiting, -Over Temperature Protection. D64 |
|
| Approvals | CE EMC — EN 55011, CE LVD — EN 61010 | |
| Dimension (WxHxD) | 193 x 98 x 215 (mm) | |
| Weight | 3kg | |
| Accessory | -User’s Manual, -PC Windows® software, Command Set, LabView ® Driver, -USB cable, RS-485 Connector and one 120ohms Resistor -USB to RS-485 Adapter |
|
| Optional Accessory | -USB to RS-485 Adapter B78 | |
| Remarks | -Adjustable Upper Voltage limit, -Power Factor Correction.B79 |
|
Remote Programming Specifications
| Communications Interface | USB (single device) and RS-485 (up to 31 Power Supplies). |
| Remote Programming Functionality | Full control of power supply functions and data readback. |
| Data Logging | Yes, with supplied software. |
| Baud Rate | 9600bps |
Introduction
This series of Programmable Switching Mode Power Supplies are designed for full remote programming with data logging functionality. Up to 31 power supplies can be connected via RS- 485. It is ideal for applications which require various groups of output settings and running periods for repetitive tests especially with multiple power supplies.
The front panel allows users to all programming and output settings as a stand alone laboratory power supply.
Full command sets are given in this manual to facilitate the integration of your own control software.
This series of power supplies have obtained the safety approval EN-61010 and EN-55011 EMC approval for scientific , industrial equipment of the CE directives.
Please keep this manual in a safe place and contact your vendor for any special requirement in optional accessories for RS-485.
NOTE:
Laboratory Power Supplies are not designed for charging batteries. Any use of this type can cause serious damage to the device, which are exempt from any legal claims whatever.
Controls and Indicators

- Jog Dial
- Up & Down Key
- Dual Function Control Key
- Black colour negative polarity output terminal
- Green colour ground terminal (connected to chassis).
- Red colour positive polarity output terminal.

- Power Switch
- AC 100-240 V AC Power Socket with input power fuse.
- RS-232 Port
- RS-485 Port
General Operation Principle
Note: This section contains a condensed overview of the unit. Read this section to quickly get started.
5.1 Quick Reference of Keypad Functions
The front Keypad is organised as follow:
- Number Keys, UP/DOWN Keys and Jog Wheel
- 4 Dual Function Control Keys
The front panel functions are summarized as follow:
| Keypad | Function | Section | |
| Number Keys, UP/DOWN Keys and Jog Wheel | |||
| Press to select numerical values | 6.2.2 | ||
| Press to ascend the numerical values | 6.2.1 | ||
| Press to descend the numerical values | 6.2.1 | ||
| Jog Wheel | Rotate to adjust the voltage and current settings | 6.2.1 | |
| Dual Function Control Keys | |||
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Press to access second function of the control keys | ||
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Press to terminate any input process and the unit will exit to normal operation | ||
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Press to use recall preset program features. Use Use Use to |
6.3.1 6.3.3 |
|
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Press |
6.1.3 | |
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Press Wheel |
6.1.2 |
|
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Press to confirm the new settings | ||
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Press |
6.1.1 | |
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Press to Enable the output at power up | 6.1.5 | |
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Press to Disable the output at power up | 6.1.5 | |
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|||
| SPECIAL Function | |||
| Press to get to the Upper Voltage Limit Setting Use |
6.1.4 | ||
| Keypad | Function | Section |
Use to confirm |
||
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Switch between set output Voltage and output Current |
User Manual
6.1 Setting Operation Modes
6.1.1. Enable/Disable Output
| Action | LCD Display | Description | |
| 1. | |
|
Output ENABLE |
| 2. | |
|
Output DISABLE |
6.1.2 Lock/ Unlock the Keypad and Jog Dial
| Action | LCD Display | Description | |
| 1. | |
Keypad and Jog Dial Locked | |
| 2. | |
Keypad and Jog Dial Un Locked |
6.1.3 RS-485 address setting
| Action | LCD Display | Description | |
| 1. | ![]() |
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This will enter into RS-485 address set menu. |
| 2. | ![]() |
Use numbering keypad to key in address from 1 to 255 for RS-485 connection | |
| 3. | ![]() |
Press this key to confirm |
6.1.4 Upper Voltage Limit Setting
| Action | LCD Display | Description | |
| 1. | ![]() |
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This will enter into Upper Voltage Limit Adjustment. e.g. 25.6V present upper voltage limit. |
| 2. | ![]() |
Use the number key to input your desired voltage | |
| 3. | ![]() |
Press this key to confirm |
Note : Whenever to terminate the Upper Voltage Limit Setting, press “CLEAR” to return to normal operation.
6.1.5 Output Enable/Disable at Power Up
| Action | LCD Display | Description | |
| 1. | ![]() |
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This will enable the output at power up. i.e. When you switch on the power supply, the output is also ON automatically with last set voltage value. |
| 2. | ![]() |
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This will disable the output at power up. i.e. The output will be OFF at next power up. This is the default setting for safety reason !! |
6.1.6 Adjust LCD brightness
| Action | LCD Display | Description | |
| 1. | Press Then | ![]() |
Press to enter into brightness set menu. |
| 2. | ![]() |
Use JOG adjust LCD brightness. It has 10 level of brightness. 0 means LCD brightness off. 9 means the most brightest. | |
| 3. | ![]() |
Press this key to confirm |
6.1.7 Enable/Disable SCPI
| Action | LCD Display | Description | |
| 1. | ![]() |
Press and to enter into SCPI enable/disable menu | |
| 2. | ![]() |
Use JOG select between Y and N | |
| 3. | Press |
Press this key to confirm |
6.2 Basic Operation
6.2.1 Setting of Voltage and Current by Jog Dial and UP & DOWN Key
| Action | LCD Display | Description | |
| 1. | Press![]() |
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Press to |
| 2. | Rotate orPress |
Rotate JOG or Press Press Rotate JOG to switch between digit to be adjust. |
6.2.2 Setting of Voltage and Current Using Keypad
| Action | LCD Display | Description | |
| 1. | Press | ![]() |
Press |
| 2. | ![]() |
Setting voltage/current by pressing numbers on Keypad. | |
| 3. | Press |
Press this key to confirm |
Note : whenever to terminate the settings of voltage and current, press “CLEAR” to return to the normal operation.
6.3 Using the Programming Features
6.3.1 Preset Program
| Action | LCD Display | Description | |
| 1. | Press Then |
Press select Preset program. e.g. |
|
| 2. | ![]() |
Use JOG and V-set/I-set adjust Voltage an d Current setting if you want to adjust the preset value. | |
| 3. | Press |
Press this key to confirm | |
| 4. | ![]() |
Note : whenever to terminate the Timed Program, press “CLEAR” to return to the normal operation.
6.3.2 Setting of Timed Program
| Action | LCD Display | Description | |
| 1. | Press Then |
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Press to enter into timed |
| 2. | ![]() |
Use JOG or numbering Keypad to select step to be review. | |
| 3. | Press |
Use UP/DOWN key to move around voltage, current and time setting of step. The select part will flash to indicate it is under modification. |
|
| 4. | ![]() |
Use JOG or numbering keypad to modify the voltage, current and time. | |
| 5. | Press![]() |
Press this key to confirm |
Note : whenever to terminate the Timed Program, press “CLEAR” to return to the normal operation.
6.3.3 Run Timed Programming
| Action | LCD Display | Description | |
| 1. | ![]() |
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Press |
| 2. | ![]() |
Use JOG or numbering keypad select number of steps to be run start from step 0. The minimum steps to be run is 2. |
|
| 3. | Press |
Press this key next to set number of cycle to be run. |
| 4. | ![]() |
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Use JOG or numbering keypad select number of cycle to be run. |
| 5. | Press |
Press this key to start running | |
| 6. | |
Press this key terminate the program running anytime. |
Note : whenever to terminate the Preset Program, press “CLEAR” to return to the normal operation.
PC connection
The new SDP series can be connect use USB or RS-485. It is auto select between USB and RS485.
*Please do not connect both USB and RS-485 at the same.
Connect Multiple Power Supplies to PC via RS-485
For multiple power supplies, use the RS-485 Interface through the RS-485 port at rear panel of the power supply. Up to 31 power supplies can be connected via RS-485.
You will need a USB to RS-485 Adapter and the connection shown in Figure 6a & 6b.

Important note:
- The SCPI command set is only available via the old RS232 or the new USB connection
- The PSCS software is only available for the RS485 interface
APPENDIX A
COMMMAND SET
Remarks in using the Remote Programming Mode The USB/485 interface is always ready for
connection to PC for remote programming operation .
{ }- command data, [ ] – return data, [OK] = “OK”, [CR] = 0dh
???? = 30h, 30h, 30h, 30h – 39h, 39h, 39h, 39h (4 bytes data)
??? = 30h, 30h, 30h – 39h, 39h, 39h (3 bytes data)
?? = 30h, 30h – 39h, 39h (2 bytes data)
<address> 30h, 30h – 3fh, 3fh (2 bytes data).
Bold – Input Command
Italic – Return Data from Power Supply
PS = Power Supply
| Command Code & Return Data | Description |
| Input Command: SESS <address> <CR> Return Data from Power Supply: [OK] [CR] |
Disable front panel keypad and make PS to Remote Mode |
| Input Command: ENDS <address> <CR> Return Data from Power Supply: [OK] [CR] |
Enable front panel keypad and make PS to exit Remote Mode |
| Input Command: CCOM <address> <RS> {000-256} <CR> Return Data from Power Supply: [OK] [CR] |
Change RS485 <RS> = 0 -> RS-232 <RS> = 1 -> RS-485 |
| Input Command: GCOM <address> <CR> Return Data from Power Supply: [RS] RS485 Address [??] [CR] [OK] [CR] |
Get the RS-485 address |
| Input Command: GMAX <address> <CR> Return Data from Power Supply: Voltage [???] Current [???] [CR] [OK] [CR] |
Get maximum voltage and current of PS |
| Input Command: GOVP <address> <CR> Return Data from Power Supply: Voltage [???] [CR] [OK] [CR] |
Get Upper Voltage Limit of PS |
| Input Command: GETD <address> <CR> |
Get Voltage & Current reading from PS |
| Return Data from Power Supply: Voltage [????] Current [????] [0] [CR] [OK] [CR] Voltage [????] Current [????] [1] [CR] [OK] [CR] |
PS in CV mode PS in CC mode |
| Input Command: GETS <address> <CR> Return Data from Power Supply: Voltage [???] Current [???] [CR] [OK] [CR] |
Get Voltage & Current Set Value from PS |
| Input Command: GETM <address> <CR> Return Data from Power Supply: Memory 1 Voltage [???] Current [???] [CR] Memory 2 Voltage [???] Current [???] [CR] . . . . . . . . . . . . . . . Memory 9 Voltage [???] Current [???] [CR] [OK] [CR] |
Get All Preset Memory Values from PS |
| Input Command: GETM <address> location {1-9} <CR> Return Data from Power Supply: Voltage [???] Current [???] [CR] [OK] [CR] |
Get Memory from Specific Preset of PS |
| Input Command: GETP <address> <CR> Return Data from Power Supply: Program 00 Voltage [???] Current [???] Minute [??] Second [??] [CR] Program 01 Voltage [???] Current [???] Minute [??] Second [??] [CR] . . . . . . . . . . . . . . . . . . . . . Program 19 Voltage [???] Current [???] Minute [??] Second [??] [CR] [OK] [CR] |
Get all the Timed Program Memory of PS |
| Input Command: GETP <address> program {00-19} <CR> Return Data from Power Supply: Voltage [???] Current [???] Minute [??] Second [??] [CR] [OK] [CR] |
Get Timed Program Memory from Specific Program of PS |
| Input Command: GPAL <address> [CR] Return Data from Power Supply: Reading voltage [####] V [ON] Reading current [####] A [ON] |
Get LCD Display Information |
| Reading watt [####] W [ON] Timer minute [####] second [##] timer [ON] colon [ON] m [ON] s [ON] Setting voltage [###] V-const [ON] V-bar [ON] V [ON] Setting current [###] I-Const [ON] I-bar [ON] A [ON] Program [#] Program [ON] P-bar [ON] SETTING [ON] Key lock [ON] Key open [ON] FAULT [ON] Output on [ON] Output off [ON] Remote [ON] [CR] [OK] [CR] | |
| Input Command: VOLT <address> voltage {000-XXX} <CR> Return Data from Power Supply: [OK] [CR] |
Set Voltage Level XXX-Max. Output Rating Voltage = XX.X V Current = X.XX V |
| Input Command: CURR <address> current {000-XXX} <CR> Return Data from Power Supply: [OK] [CR] |
Set Current Level |
| Input Command: SOVP <address> voltage {000-XXX} <CR> Return Data from Power Supply: [OK] [CR] |
Set Upper Voltage Limit of PS |
| Input Command: SOUT <address> 1 <CR> Return Data from Power Supply: [OK] [CR] |
Disable Output of PS |
| Input Command: SOUT <address> 0 <CR> Return Data from Power Supply: [OK] [CR] |
Enable Output of PS |
| Input Command: POWW <address> location {1-9}0 <CR> Return Data from Power Supply: [OK] [CR] |
Enable the output when switch on the power supply. |
| Input Command: POWW <address> location {1-9}1 <CR> Return Data from Power Supply:[OK] [CR] |
Disable the output when switch on the power supply. |
| Input Command: PROM <address> location {1-9} Voltage {000-XXX} Current {000-XXX} <CR> Return Data from Power Supply: [OK] [CR] |
Set Voltage and Current values of Preset Memory |
| Input Command: |
| PROP <address> location {00-19} Voltage {000-XXX} Current {000-XXX} Minute {00-99} Second {00-59} <CR> Return Data from Power Supply: [OK] [CR] |
Set Voltage, Current and Time period of Timed Program |
| Input Command: RUNM <address> location {1-9} <CR> Return Data from Power Supply: [OK] [CR] |
Recall Preset Memory 1-9 |
| Input Command: RUNP <address> times {000-256} <CR> Return Data from Power Supply: [OK] [CR] |
Run Timed Program (000 = run infinite times) |
| Input Command: STOP <address> <CR> Return Data from Power Supply: [OK] [CR] |
Stop Timed Program |
This manual is according the latest technical knowing. Technical changings, which are in the interest of progress, reserved.
We herewith confirm that the units are calibrated by the factory according to the specifications as per the technical specifications.
We recommend to calibrate the unit again, after 1 year.
© PeakTech®04/2021 / AW./EHR./PL
PeakTech Prüf- und
Messtechnik GmbH – Gerstenstieg 4 –
DE-22926 Ahrensburg / Germany
+49-(0) 4102-97398 80
+49-(0) 4102-97398 99
info@peaktech.de
www.peaktech.de
Documents / Resources
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PeakTech 1885, 1890 Programmable Switching Mode Power [pdf] Instruction Manual 1885, 1890, 1885 1890 Programmable Switching Mode Power, 1885 1890, Programmable Switching Mode Power, Switching Mode Power, Mode Power, Power |




















to enter into brightness set menu.




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