Data Sheet Switching DC Power Supplies Models 1685B, 1687B & 1688B Features and Benefits B&K Precision models 1685B, 1687B, and control modes. Save up to three different presets (cid:0) Automatic CV/CC crossover operation 1688B are laboratory grade switching mode of voltage and current values for quick recall. For (cid:0) Lightweight and compact DC power supplies with high current output in remote control, an analog remote control (cid:0) Rotary encoder control for precise voltage and a small, lightweight form factor. These power terminal is accessible on the rear, or use the USB current setting supplies provide various configurations of output interface to communicate with the power supply (cid:0) Save up to 3 user-defined voltage and current voltage and current, and feature rotary encoder via PC software or remote commands. control knobs, which make setting voltage and presets for quick recall current levels fast and precise. Its dual action These features make the 1685B Series suitable (cid:0) PC software for remote control and external push button allows the user to easily set both for a wide range of applications including timed programming coarse and fine, voltage and current levels. production testing, telecommunications, R&D, (cid:0) Analog remote control function electronic field service, and university labs. (cid:0) USB interface In addition to its constant voltage (CV) and (cid:0) Front panel auxiliary output constant current (CC) modes, these high efficien- cy DC power supplies offer preset and remote (cid:0) Overvoltage, overtemperature, and overload protection Outputs / Model 1685B 1687B 1688B Variable Output Voltage 1 - 60 V 1 - 36 V 1 - 18 V Variable Output Current 0 - 5 A 0 - 10 A 0 - 20 A Technical data subject to change www.bkprecision.com © B&K Precision Corp. 2012

Switching DC Power Supplies Models 1685B, 1687B & 1688B Designed to Make Your Flexibility & Performance Work Easier Fully Protected Have peace of mind knowing that these power Front Panel supplies come with built-in OVP (overvoltage LED indicators for Rotary encoder knobs for protection), OTP (overtemperature protection), constant voltage and quick and precise setting and OLP (overload protection) circuitry. These Bright, dual LED displays constant current modes of voltage and current protections help prevent serious damage to equipment in case of power supply failure Custom Presets Quickly use common voltage and current settings with a flip of the Recall preset switch. Up to three different presets can be set and recalled. Rear control indicator Auxiliary output terminal Analog Remote Control Capability Use the included connector to wire up to an external variable DC voltage source or variable Rear Panel resistor to remotely control the power supply’s output voltage and current or to turn the Main output Mode selection output on/off. terminal Recall preset switch switch Cooling fan PC Connectivity Control your instrument through remote control PC software or use programming USB device port Analog remote commands to communicate with your control terminal instrument. 2 www.bkprecision.com

Switching DC Power Supplies Models 1685B, 1687B & 1688B Specifications Models 1685B 1687B 1688B Output Variable Output Voltage 1 – 60 V 1 – 36 V 1 – 18 V Variable Output Current 0 – 5 A 0 – 10 A 0 – 20 A Voltage Regulation Load (0-100% Load) ≤ 50 mV Line (90-132 VAC, 170-264 VAC Variation) ≤ 20 mV Current Regulation Load (10-90% Rated Voltage) ≤ 100 mA Line (90-132 VAC, 170-264 VAC Variation) ≤ 50 mA Ripple & Noise Ripple & Noise Voltage (rms) ≤ 5 mV Ripple & Noise Voltage (peak-peak) ≤ 50 mV Current Ripple & Noise (rms) ≤ 30 mA Meter Type & Accuracy Voltage Meter 3-Digit LED Display ± 0.2% + 3 counts Current Meter 3-Digit LED Display ± 0.2% + 3 counts Other Input Voltage 100-240 VAC 50/60 Hz 3.7 A (100 VAC) 4.6 A (100 VAC) 4.6 A (100 VAC) Full Load Input Current 1.7 A (230 VAC) 2.1 A (230 VAC) 2.1 A (230 VAC) 82% (100 VAC) 82% (100 VAC) 81% (100 VAC) Efficiency 86% (230 VAC) 86% (230 VAC) 85% (230 VAC) Switching Frequency 100 – 120 kHz O/P 1-5 V: set voltage +2 V O/P 1-5 V: set voltage +2 V O/P 1-5 V: set voltage +2 V Tracking Overvoltage Protections O/P 5-20 V: set voltage +3 V O/P 5-20 V: set voltage +3 V O/P 5-18 V: set voltage +3 V O/P 20-60 V: set voltage +4 V O/P 20-36 V: set voltage +4 V Transient Response Time (50-100% Load) 1.5 ms Power Factor Correction > 0.95 at optimal load Cooling Method Thermostatically controlled fan from zero to full speed Protections Overload, Overvoltage, Overtemperature Special Features 3 User-Defined Voltage and Current Presets, Analog Remote Control Max. 20 voltage and current steps External Timed Programming Max. 99 min + 59 sec step time Max. 999 running cycles General Operating Temperature 32 °F to 104 °F (0 °C to 40 °C) ≤ 80% R.H. Storage Temperature 5 °F to 158 °F (-15 °C to 70 °C) ≤ 85% R.H. Dimensions (WxHxD) 7.9” x 3.5” x 8.2” (200 x 90 x 208 mm) Weight 5.2 lbs (2.4 kg) Two Year Warranty Suppliedaccessories Power cord, instruction manual, application software CD, USB cable, remote control connector Note: All specifications apply to the unit after a temperature stabilization time of 15 minutes over an ambient temperature range of 23 °C ± 5 °C. 3 v040412 www.bkprecision.com

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