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B&K Precision 1685B Series - 1685B Switching DC Power Supply
The B&K Precision BK1685B is a laboratory-grade switching DC power supply designed for applications requiring higher voltage output in a compact benchtop form factor. Offering an adjustable output range from 1 to 60 V and up to 5 A, this model combines precision control, low ripple and noise performance, and advanced remote-control capabilities. Engineers, technicians, educators, and R&D professionals can quickly configure voltage and current settings using intuitive rotary encoder controls, save custom presets for recurring test procedures, and remotely operate the supply through USB or analog control interfaces.
Key Facts:
Adjustable output current: 0 to 5 A.
Up to 300 W output power.
Automatic CV/CC crossover operation.
Rotary encoder controls for precise setting adjustments.
Save recall up to 3 custom voltage/current presets.
USB connectivity with PC software support.
Analog remote-control capability.
Low ripple and noise: ≤5 mVrms.
OVP, OTP, and OLP protection features.

Model | Voltage Range | Current Range | Power |
|---|---|---|---|
BK1685B | 1-60 V | 0-5 A | 300 W |
BK1687B | 1-36 V | 0-10 A | 360 W |
BK1688B | 1-18 V | 0-20 A | 360 W |
Precise Power Delivery for Demanding Applications
The 1685B Series combines low ripple and noise performance with accurate digital control, making it ideal for powering sensitive electronic circuits, prototypes, communications equipment, and test assemblies. Rotary encoder controls allow users to quickly dial in voltage and current settings while maintaining precise adjustment capability. Automatic CV/CC crossover operation ensures stable output across a wide variety of loads.


Built for Productivity and Remote Operation
Whether you're automating a test station or working in a busy lab environment, the 1685B Series helps streamline workflows. Save up to three frequently used setup profiles for instant recall, manage the power supply remotely through USB-connected PC software, or integrate analog remote control into custom test systems. External timed programming capability further enhances automated testing and validation processes.
In The Box:
BK1685B Switching DC Power Supply
AC power cord
USB cable
Analog remote-control connector
Instruction manual
Application Software CD
B&K 1685B DC Power Supply FAQs
1. What is the maximum voltage output of the BK1685B?
The BK1685B provides an adjustable output from 1 V to 60 V DC.
2. What is the maximum current output?
The instrument can provide up to 5 A of output current.
3. Is the BK1685B suitable for automated testing?
Yes. USB and analog remote-control interfaces support automated test environments and remote operation.
4. Can custom operating settings be saved?
Yes. Up to three user-defined voltage and current presets can be stored and recalled.
5. What applications is the BK1685B best suited for?
High-voltage bench testing, R&D laboratories, telecommunications equipment testing, service centers, and educational laboratories.
