INSTRUCTION
MANUAL MODEL 1670A
INSTRUCTION
MANUAL
MODEL 1670A
Triple Output
DC POWER SUPPLY
Test Eq
uipment Depot - 800.517.8431
TestEquipmentDepot.com
- 99 Washington Street Melrose, MA 02176
TEST INSTRUMENT SAFETY
WARNING
Normal use of test equipment exposes you to a certain amount of danger from electrical shock because testing must
sometimes be performed where exposed high voltage is present. An electrical shock causing 10 milliamps of current to pass
through the heart will stop most human heartbeats. Voltage as low as 35 volts dc or ac rms should be considered dangerous
and hazardous since it can produce a lethal current under certain conditions. Higher voltages are even more dangerous. Your
normal work habits should include all accepted practices to prevent contact with exposed high voltage, and to steer current
away from your heart in case of accidental contact with a high voltage. Observe the following safety precautions:
1. There is little danger of electrical shock from the dc output of this power supply. However, there are several other possible test
conditions using this power supply that can create a high voltage shock hazard:
a. If the equipment under test is the "hot ch as si s" ty pe , a serious shock hazard exists un le ss th e equipment is unplugged (just
turning off the equipment does not remove the hazard), or an isolation transformer is used.
b. If the equipment under test is "powered up" (and that equipment uses hi gh vo lt ag e in an y of its circuits), the p ow er su pp ly
outputs may b e floated to the potential at the po in t of connection. Remember that hi gh voltage may appear at unexpected
points in defective equipment. Do not float th e po we r su pp ly o ut pu t to m or e than 100 volts peak wi th r es pe ct t o ch as si s or
earth ground.
c. If the equipment under test is "off" ( an d th at e qu ip me nt u se s hi gh v ol ta ge i n an y of i ts c ir cu it s un de r no rm al o pe ra ti on ),
discharge high voltage capacitors before m ak in g connections or t es ts . Some circuits retain high voltage lo ng af te r the
equipment is turned off.
2. Use only a polarized 3 wire ac outlet. This assures that the power supply chassis, case, and g ro un d terminal ar e connected t o
a good earth ground and reduces danger from electrical shock.
3. Don't expose high voltage needlessly. Remove housings and covers only when necessary. Tu rn off e qu ip me nt while ma ki ng
test connections in high voltage circuits. Discharge high voltage capacitors after removing power.
(Continued on inside back cover)
Instruction Manual
For
Model 1670A
Triple Output
DC POWER SUPPLY
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
TABLE OF CONTENTS
Page
TEST INSTRUMENT SAFETY.........................inside front cover
INTRODUCTION.........................................................................1
SPECIFICATIONS........................................................................2
CONTROLS AND INDICATORS................................................5
OPERATING INSTRUCTIONS...................................................7
Safety Precautions...................................................................7
Equipment Protection Precautions..........................................7
Power Supply Hook up and Operation....................................7
Variable Voltage Output....................................................7
Typical Constant Voltage Output......................................8
Setting Current Limit........................................................8
Typical Constant Current Operation.................................8
Page
Constant Voltage/Current Characteristics.........................9
12 Vdc Output...................................................................9
5 Vdc Output...................................................................10
Dual or Triple Output............................................................10
Connecting Outputs in Series................................................10
MAINTENANCE........................................................................12
Fuse Replacement..................................................................12
Instrument Repair Service.....................................................12
SERVICE INFORMATION.........................................................13
LIMITED ONE YEAR WARRANTY........................................14
TEST INSTRUMENT SAFETY...........................inside back cover
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INTRODUCTION
The B+K Precision Model 1670A is a general purpose triple
output DC power supply. Their main outputs are versatile constant
voltage or constant current regulated power source that is variable
from 0 to 30 volts and 0 to 3 amps. An indicator lights in the
constant current mode, and serves as an overload indicator in the
constant voltage mode.
While this model is competitively priced with most single
output power supplies, they have the added advantage of fixed 5
volt and 12 volt outputs capable of providing up to 0.5 amps each.
One common application for these power supply is powering of
circuit boards while troubleshooting. Many circuit boards require
two or three input voltages, with the most common values being 5
volts and 12 volts. These power supplies can provide up to three
outputs simultaneously. Since each output is fully isolated, any
output can be connected for positive or negative polarity.
The main output voltage and current are continuously
monitored by two digital LCD meters with resolution of 0.1 volt
and 0.01 amp.
The Model 1670A can operate continuously at its maximum
rated output and is fully overload protected.
This manual provides the information to help assure the
maximum performance and longest life for your power supply.
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