B&K Precision 1655A User's Manual
Isolated-Variable
AC POWER SUPPLY
Aislada, variable
FUENTE DE PODER DE AC
INSTRUCTION
MANUAL
MANUAL DE
INSTRUCCIÓN
MODELS 1653A & 1655A
MODELOS 1653A & 1655A
TEST INSTRUMENT SAFETY
WARNING
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 condition s. Higher
voltages are even more dangerous. Your normal work habits should include all accepted practices to prevent contact with exposed high
voltage, and that will steer current away from your heart in case of accidental contact with a high voltage. You will signifi cantly
reduce the risk factor if you know and observe the following safety precautions:
1. The B+K Precision Models 1655A and 1653A AC Power Supplies are sources of high voltage ac. The person using the
instrument should be a qualified electronics technician or otherwise trained and qualified to work with high voltage.
2. Use only a polarized 3-wire ac outlet. This assures that the power supply chassis, case, and ground terminal are connected to a
good earth ground and reduces danger from electrical shock.
3. When servicing any equipment equipped with a two-wire ac plug, treat it as “hot chassis” type and connect it to the ISOLATED
OUTPUT outlet of the ac power supply. Even some equipment with a polarized plug is the “hot chassis” type.
4. Never connect two pieces of “hot chassis” equipment to ISOLATED OUTPUT outlets simultaneously. There may be a serious
shock hazard between two chassis.
5. Don’t expose high voltage needlessly. Remove housings and covers only when necessary. Turn off equipment while making
test connections in high-voltage circuits. Discharge high-voltage capacitors after removing power.
6. If possible, familiarize yourself with the equipment being tested and the location of its high voltage points. However,
remember that high voltage may appear at unexpected points in defective equipment.
7. Use an insulated floor material or a large, insulated floor mat to stand on, and an insulated work surface on which to place
equipment; and make certain such surfaces are not damp or wet.
8. Use the time proven “one hand in the pocket” technique while handling an instrument probe. Be particularly careful to avoid
contacting a nearby metal object that could provide a good ground return path.
9. When testing ac powered equipment, remember that ac line voltage is usually present on some power input circuits such as the
on-off switch, fuses, power transformer, etc. any time the equipment is connected to an ac outlet, even if the equipment is
turned off.
10. Never work alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio-pulmonary resuscitation)
first aid is highly recommended.
Instruction Manual
for
MODELS 1653A & 1655A
Isolated, Variable
AC POWER SUPPLY
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
page
TABLE OF CONTENTS
TEST INSTRUMENT SAFETY ..................... inside front cover
FEATURES ................................................................................ 3
SPECIFICATIONS .................................................................... 4
CONTROLS AND INDICATORS ............................................ 6
OPERATING INSTRUCTIONS .............................................. 12
Precautions ............................................................................... 12
Troubleshooting: Using the AC Power Supply as an
Isolation Transformer ....................................................... 16
Troubleshooting: Using the AC Power Supply as a
Variable AC Voltage Source. ...................................... ….21
Troubleshooting: Using the AC Power Supply to
Measure Electrical Loads.................................................. 23
Using the Model 1655A as a Leakage Tester ........................... 25
Soldering Iron Temperature Control ......................................... 27
page
CIRCUIT DESCRIPTION..........................................................29
MAINTENANCE AND CALIBRATION..................................30
Preventive Maintenance...............................................................30
Returning for Service...................................................................30
Fuse Replacement........................................................................30
Auto-Transformer Brush Replacement........................................31
Calibration Adjustments..............................................................31
Performance Tests........................................................................34
Troubleshooting...........................................................................35
CUSTOMER SUPPORT.............................................................37
WARRANTY INFORMATION.................................................37
Warranty Service Instructions......................................................38
Spanish Manual............................................................................39
2
FEATURES
Unless otherwise stated, all information in this section applies equally to Model 1653A and 4655A
WIDE VOLTAGE RANGE
Output voltage continuously variable from 0 to 150VAC.
WIDE CURRENT RANGE
Model 1655A
Heavy duty unit handles virtually all servicing needs.
Output current up to 3 amps continuous, 4 amps
intermittent.
Model 1653A
Handles many servicing needs. Output current up to 2
amps continuous.
WIDE LOAD MEASUREMENT CAPABILITY
Model 1655A
Built in multi-function meter. 0-150V. Two current
ranges of 0-2A and 0-4A for improved resolution. Current
scales also calibrated in VA at 120V.
Model 1653A
Built in dual-purpose meter measures output voltage from 0150V and output current from 0-2A.
ISOLATED OUTPUT VOLTAGE
Built-in isolation transformer for safe servicing of “hot
chassis” equipment. One isolated outlet on Mode 1653A, two
isolated outlets on Model 1655A for greater convenience.
BUILT-IN METER
Model 1655A
3-1/4 inch meter. Multi-color scales. Overrange
protection
Model 1653A
2 inch meter. Overrange protection.
---Model 1655A offers the following additional features--
-
POWER LINE LEAKAGE TEST
OSHA, UL, and CSA power line leakage test capability; fast
and safe measurement.
EXPANDED LEAKAGE SCALE
0-5mA (0-5000µA) leakage scale is expanded in most
commonly used 100-500µA portion, compressed to 5 mA
full scale. Overload protected.
CIRCUIT BREAKER OVERLOAD PROTECTION
Isolated output protected by easily reset circuit breaker.
SOLDERING IRON TEMPERATURE CONTROL
Built-in solid state soldering iron temperature control
Built-in solid state soldering iron temperature control.
3
SPECIFICATIONS
MODEL 1655A
OUTPUT ISOLATION
Leakage less than 0.1mA (25ºC, 50% relative humidity.)
VOLTAGE ADJUSTMENT RANGE
0-150VAC, with input at 120VAC
VOLTAGE/CURRENT SENSING
Sine wave average, calibrated in RMS
MAXIMUM CURRENT (Isolated)
3A continuous, 4A intermittent (0-130V). Intermittent not to
exceed 4 minutes at 4A followed by 5 minutes at 1A max.
METER SCALES
Voltage ................................ .................................... :0-150V
Current:. ....................................................................... 0-2A
......................................................................... 0-4A
Volt-Amps (Voltage Set to 120) ............................ 0-240VA
................................................................. 0-480VA
Leakage ......................0 to 5mA (5,000µA), expanded scale
METER ACCURACY (25ºC)
Volts:......................±5% of full scale (calibrated @ 120VAC)
Current:...........................................................±5% of full scale
Leakage:............................................................±5% @ 500µA
MODEL 1653A
OUTPUT ISOLATION
Leakage less than 0.1mA (25ºC, 50% relative humidity)
VOLTAGE ADJUSTMENT RANGE
0-150VAC, with input at 120VAC
VOLTAGE/CURRENT SENSING
Sine wave average, calibrated in RMS.
MAXIMUM CURRENT (Isolated)
2A continuous (0-130V).
METER SCALES
Voltage:.........................................................................0-150V
Current:.............................................................................0-2A
METER ACCURACY (25ºC)
Volts:......................±5% of full scale (calibrated @ 120VAC)
Current:...........................................................±5% of full scale
4
MODEL 1655A
AC INPUT
120 VAC, 60Hz, 600 VA
OPERATING TEMPERATURE RANGE
0° C to +40°C.
STORAGE TEMPERATURE
-30° C to +60°C.
WEIGHT
22lb (10kg.)
DIMENSIONS (WxHxD)
10.5” x 5.7” x 12” (267 x 145 x 305 mm)
PEAK CURRENT (Inrush)
30 A max (inrush limited to one cycle at 30A).
SOLDER IRON TEMPERATURE CONTROL
70% - 99% of power line (100W max).
MODEL 1653A
AC INPUT
120 VAC, 60Hz, 300 VA
OPERATING TEMPERATURE RANGE
0°C to +40°C.
STORAGE TEMPERATURE
-30°C TO +60°C.
WEIGHT
12 lb (5.5 kg).
DIMENSIONS (WxHxD)
5.5” x 6.5” x 10.5” (140 x 165 x 267 mm).
NOTE: Specifications and information are subject to change
without notice. Please visit www.bkprecision.com for the most
current product information.
5
FRONT PANEL CONTROLS
CONTROLS AND INDICATORS
(Refer to Fig. 1 and 2)
1. POWER ON Switch.
2. POWER ON Pilot Light.
3. Function Switch.
Model 1655A
Five interlocking pushbutton switches which select
function and meter scale. Pressing a button releases
the previous selection. The following selections are
available:
VOLTS. Connects meter to measure voltage at
ISOLATED OUTPUT. Use 0-150 VOLTS
scales on meter. Voltage is adjustable with AC
VOLTS control.
AMPS 0 – 4. Connects meter to measure current of
ISOLATED OUTPUT. USE 0-4 AMPS scale on
meter. When voltage is set to 120 VAC, the 0-480
VA scale may be used to measure the output load
in volt-amps
AMPS 0-2. Connects meter to measure current of
ISOLATED OUTPUT. Use 0-2 AMPS scale on
meter. When voltage is set to 120VAC, the
0-240VA scale may be used to measure the
output load in volt-amps.
LEAKAGE COM. Connects meter to measure leakage with
respect to common side of ac line. Use LEAKAGE scale on
meter. Voltage must be preset to 120VAC for accurate
leakage measurements.
LEAKAGE HOT. Connects meter to measure leakage with
respect to hot side of ac line. Use LEAKAGE scale on
meter. Voltage must be preset to 120VAC for accurate
leakage measurements.
Model 1653A
Alternate action pushbutton switch selects function of meter.
Push once to latch button in AMPS (in) position. Push again to
release button to VOLTS (out) position. The following
selections are available:
VOLTS. Connects meter to measure voltage at ISOLATED
OUTPUT. Use 0-150 VOLTS scale on meter. Voltage is
adjustable with AC Volts control.
AMPS. Connects meter to measure current of ISOLATED
OUTPUT. Use 0-2 AMPS scale on meter.
4. Meter. Appropriate scale is selected by function switch.
5. AC VOLTS Control. Adjusts voltage at ISOLATED
OUTPUT receptacle(s) from 0 to 150 volts.
6
6. ISOLATED OUTPUT Receptacle(s). Isolated,
variable ac voltage outlet(s). The equipment under test
plugs in here. Single outlet on Model 1653A. Dual
outlets on Model 1655A.
7. *Leakage Probe. With LEAKAGE function selected,
touching probe tip to exposed metallic parts of
equipment under test checks power line leakage.
8. *SOLDER TEMP Control. Full counterclockwise
rotation turns off soldering iron outlet on rear panel.
Initial clockwise rotation turns on outlet at standby
(warm) temperature. Further clockwise rotation
increases soldering iron temperature. Temperature
adjustment is tapered, allowing fine adjustment of “hot”
temperature at upper end of adjustment range. This
control is completely independent of the POWER ON
switch.
9. *Solder Temp Pilot Light. Lights whenever soldering
iron outlet on rear panel is powered.
REAR PANEL CONTROLS
(Refer to Fig. 3 and 4)
10. AC Power Cord.
*=Model 1655A Only.
11. Fuse.
Model 1655A
4A fuse protects auto-transformer against excessive output
current at low voltages which may not trip the input
circuit breaker.
Model 1653A
3A line fuse protects against excessive input current. An
internal 3A fuse protects against excessive output current
at low voltages which may not blow the input fuse.
12. *Circuit Breaker. 3.15A circuit breaker protects against
excessive input current. Remove overload and push to
reset.
13. *Soldering Iron Outlet. AC outlet for soldering iron. Duty
cycle, and thus temperature, is variable with SOLDER
TEMP control on front panel. This outlet is intended only
for non-transformer type soldering irons rated at 100 watts
or less.
*=Model 1655A Only
7
Figure 1. Front Panel Controls and Indicators, Model 1655A
8
CONTROLS AND INDICATORS
CONTROLS AND INDICATORS
Figure 2. Front Panel Controls and Indicators, Model 1653A
9
Figure 3. Rear Panel Controls and Indicators, Model 1655A
10
Figure 4. Rear Panel Controls and Indicators, Model 1653A
11