BK Precision 1688A Switching DC Power Supply

The BK Precision 1688A is a DC power supply designed for benchtop applications, particularly in automotive and marine electronics servicing. It offers adjustable voltage and current outputs with built-in monitoring capabilities. The unit is equipped with protection features to safeguard both the power supply and the connected equipment.

### Technical Specifications

* **Model:** 1688A
* **Manufacturer:** BK Precision
* **Type:** Benchtop DC Power Supply
* **Output Voltage Range:** 3 to 14 VDC
* **Maximum Output Current:**
* 20 A at 13.8 to 14 VDC
* 4.5 A at 3 VDC
* Note: Maximum current output is proportional to the voltage setting.
* **Guaranteed Output:** 20 A at 13.8V
* **Power Output:** Up to 200W (Note: some sources indicate up to 120W or 200W for similar series, exact for 1688A may vary based on voltage/current setting)
* **Meters:** Two panel-mounted analog meters for continuous monitoring of output voltage and current
* **Voltage Regulation (Line):** 0.008 (Note: one source indicates 5mV (±2% Load) for line regulation, and 50mV (0-100% Load) for load regulation, with Meter Accuracy ± 7% F.S.)
* **Ripple & Noise (RMS):** 10mV rms (Note: one source specifies 5mV)
* **Input Voltage:** 108 to 132 VAC

### Electrical Protection Features

* **Current Limiting:** Overload protection with foldback
* **Over Voltage Protection:** Included
* **Short Circuit Protection:** Included
* **Reverse Polarity Protection:** Included
* **Thermal Protection:** Included

### Physical Characteristics

* **Dimensions:** 11.500″ L x 8.500″ W x 4.900″ H (292.10mm x 215.90mm x 124.46mm)
* **Weight:** 20 lbs (9.1 kg)
* **Cooling:** Thermostatically controlled cooling fan

### Operational Capabilities

* **Continuous Operation:** Designed to operate continuously at full load without overheating
* **Parallel Operation:** Two units can be connected in parallel to double the current capacity (up to 40 A) while maintaining the 3-14 VDC output range.
* **Series Operation:** Two units can be connected in series for higher voltage output.

### Interfaces and Controls

* **Front Panel:**
* POWER Switch
* VOLTAGE Control knob
* Analog V Meter (0 to 20 V scale)
* Analog A Meter (0 to 30 A scale)
* OUTPUT “+” Terminal (Red)
* OUTPUT “-” Terminal (Black)
* TIE POINTS (2A MAX)
* **Rear Panel:** Output terminals for higher current connections.

### Compliance and Certifications

* **ECCN:** EAR99
* **HTSUS:** 8504.40.9530
* **RoHS Status:** Not applicable

### Accessories

* **Hook-Up Cable Set (TL 5A):** 4mm Banana plug to alligator clip, 5A rating, 40″ (1.0m) length.
* **Power Supply Test Leads Set (TLPS):** Includes medium and large insulated alligator clips, black and red components, sense lead.
* **Instruction Manual:** Supplied with the unit.
* **Optional:** TL-30 Hook-up leads.

### Product Status

* **Obsolete:** The BK Precision 1688A is no longer manufactured.
* **Substitutes:** The BK Precision 1688B is listed as a potential substitute.

Why Choose Aumictech for BK Precision 1688A?
At Aumictech, we specialize in supplying high-end test and measurement equipment. Whether you need reliable power solutions for automotive electronics testing, robust support for product development, or precise instruments for quality control, our team ensures that the BK Precision 1688A, or its suitable alternatives, deliver maximum performance for your application. We understand the critical nature of dependable power in engineering environments and are committed to providing solutions that meet rigorous technical demands.