B&K Precision 1688B Datasheet

Data Sheet

Switching DC Power Supplies

Models 1685B, 1687B & 1688B

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 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.
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.

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.
In addition to its constant voltage (CV) and
constant current (CC) modes, these high efficien­cy DC power supplies offer preset and remote

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

Features and Benefits

■ Automatic CV/CC crossover operation

■ Lightweight and compact

■ Rotary encoder control for precise voltage and

current setting

■ Save up to 3 user-defined voltage and current

presets for quick recall

■ PC software for remote control and external

timed programming

■ Analog remote control function

■ USB interface

■ Front panel auxiliary output

■ Overvoltage, overtemperature, and overload

protection

Technical data subject to change
© B&K Precision Corp. 2012

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Switching DC Power Supplies

Models 1685B, 1687B & 1688B

Work Easier

Fully Protected

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

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.

Flexibility & PerformanceDesigned to Make Your

Front Panel

Bright, dual LED displays

LED indicators for
constant voltage and
constant current modes

Rotary encoder knobs for
quick and precise setting
of voltage and current

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.

Rear Panel

Main output
terminal

USB device port

Recall preset switch

Analog remote
control terminal

Rear control indicator

Mode selection
switch

Auxiliary output terminal

Cooling fan

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Switching DC Power Supplies

Models 1685B, 1687B & 1688B

Specifications

Mode l s 16 85 B 16 87 B 16 8 8 B

Out p u t

Variable Output Voltage 1 – 60 V 1 – 36 V 1 – 18 V

Variable Output Current 0 – 5 A 0 – 10 A 0 – 20 A

Vo l t a g e R e g u l a t io n

Load (0-100% Load) ≤ 50 mV

Line (90-132 VAC, 170-264 VAC Variation) ≤ 20 mV

Cu r r e n t R e g u l a ti o n

Load (10-90% Rated Voltage) ≤ 100 mA

Line (90-132 VAC, 170-264 VAC Variation) ≤ 50 mA

Ri pp l e & No i s e

Ripple & Noise Voltage (rms) ≤ 5 mV

Ripple & Noise Voltage (peak-peak) ≤ 50 mV

Current Ripple & Noise (rms) ≤ 30 mA

Me te r T y p e & Ac c u r a c y

Voltage Meter 3-Digit LED Display ± 0.2% + 3 counts

Current Meter 3-Digit LED Display ± 0.2% + 3 counts

Oth e r

Input Voltage 100-240 VAC 50/60 Hz

Full Load Input Current

Efficiency

Switching Frequency 100 – 120 kHz

Tracking Overvoltage Protections

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

Ge n e r a l

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)

Supplied accessories 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.

3.7 A (100 VAC)

1.7 A (230 VAC)
82% (100 VAC)

86% (230 VAC)

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

4.6 A (100 VAC)

2.1 A (230 VAC)
82% (100 VAC)

86% (230 VAC)

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

Max. 20 voltage and current steps

Max. 99 min + 59 sec step time

Max. 999 running cycles

4.6 A (100 VAC)

2.1 A (230 VAC)
81% (100 VAC)

85% (230 VAC)

O/P 1-5 V: set voltage +2 V

O/P 5-18 V: set voltage +3 V

Two Year Warranty

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