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

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

3 www.bk precision.com Switching DC Power Supplies Models 1685B, 1687B & 1688B v080619 Specifications 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. 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 Full Load Input Current 3.7 A (100 VAC)

1.7 A (230 VAC)

4.6 A (100 VAC)

2.1 A (230 VAC)

Efficiency 82% (100 VAC) 86% (230 VAC) 82% (100 VAC) 86% (230 VAC) 81% (100 VAC) 85% (230 VAC) Switching Frequency 100 – 120 kHz Tracking Overvoltage Protections O/P 1-5 V: set voltage +2 V O/P 5-20 V: set voltage +3 V O/P 20-60 V: set voltage +4 V O/P 1-5 V: set voltage +2 V O/P 5-20 V: set voltage +3 V O/P 20-36 V: set voltage +4 V O/P 1-5 V: set voltage +2 V O/P 5-18 V: set voltage +3 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 External Timed Programming Max. 20 voltage and current steps Max. 99 min + 59 sec step time Max. 999 running cycles General Operating T emperature 32 °F to 104 °F (0 °C to 40 °C) ≤ 80% R.H. Storage T emperature 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 Supplied accessories Power cord, instruction manual, USB cable, remote control connector