Data Sheet
Switching DC Power Supplies
Models 1685B, 1687B & 1688B
Features and Benefits
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
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.
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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
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Outputs / Model
Variable Output Voltage
Variable Output Current
1685B
1 - 60 V
0-5A
1687B
1 - 36 V
0 - 10 A
1688B
1 - 18 V
0 - 20 A
Technical data subject to change
© B&K Precision Corp. 2012
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Switching DC Power Supplies
Models 1685B, 1687B & 1688B
Designed to Make Your
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 & Performance
Front Panel
LED indicators for
constant voltage and
constant current modes
Rotary encoder knobs for
quick and precise setting
of voltage and current
Bright, dual LED displays
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
resistor to remotely control the power supply’s
output voltage and current or to turn the
output on/off.
Rear Panel
Main output
terminal
Recall preset switch
Mode selection
switch
Cooling fan
PC Connectivity
Control your instrument through remote
control PC software or use programming
commands to communicate with your
instrument.
USB device port
Analog remote
control terminal
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Switching DC Power Supplies
Models 1685B, 1687B & 1688B
Specifications
Model s
Out put
Variable Output Voltage
Variable Output Current
Vol tage Regulatio n
Load (0-100% Load)
Line (90-132 VAC, 170-264 VAC Variation)
Curren t Regulati on
Load (10-90% Rated Voltage)
Line (90-132 VAC, 170-264 VAC Variation)
Ri ppl e & Noi se
Ripple & Noise Voltage (rms)
Ripple & Noise Voltage (peak-peak)
Current Ripple & Noise (rms)
Me ter Type & Accuracy
Voltage Meter
Current Meter
Othe r
Input Voltage
Full Load Input Current
Efficiency
Switching Frequency
Tracking Overvoltage Protections
Transient Response Time (50-100% Load)
Power Factor Correction
Cooling Method
Protections
Special Features
External Timed Programming
Gen eral
Operating Temperature
Storage Temperature
Dimensions (WxHxD)
Weight
Supplied accessories
32 °F to 104 °F (0 °C to 40 °C)
≤
80% R.H.
5 °F to 158 °F (-15 °C to 70 °C)
≤
85% R.H.
7.9” x 3.5” x 8.2” (200 x 90 x 208 mm)
5.2 lbs (2.4 kg)
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
3.7 A (100 VAC)
1.7 A (230 VAC)
82% (100 VAC)
86% (230 VAC)
100-240 VAC 50/60 Hz
4.6 A (100 VAC)
2.1 A (230 VAC)
82% (100 VAC)
86% (230 VAC)
100 – 120 kHz
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
1.5 ms
> 0.95 at optimal load
Thermostatically controlled fan from zero to full speed
Overload, Overvoltage, Overtemperature
3 User-Defined Voltage and Current Presets, Analog Remote Control
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)
1 – 60 V
0–5A
1 – 36 V
0 – 10 A
≤
50 mV
≤
20 mV
≤
100 mA
≤
50 mA
≤
5 mV
≤
50 mV
≤
30 mA
3-Digit LED Display ± 0.2% + 3 counts
3-Digit LED Display ± 0.2% + 3 counts
1 – 18 V
0 – 20 A
16 85 B
16 87B
1 68 8B
O/P 1-5 V: set voltage +2 V
O/P 5-18 V: set voltage +3 V
Two Year Warranty
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.
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