This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in
electronic data processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited.
This publication represent the technical status at the time of printing.
© Copyright 2019 by Conrad Electronic SE.
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• If necessary, you can also readjust the current limit or the value for the voltage control, if the
output sockets are disconnected from the mains.
• Always switch off loads and lab power supply before disconnecting the loads.
The lab power supply has a protection circuit which will limit the current in the
event of a short circuit. Always switch off the lab power supply immediately
in the event of a short circuit to avoid overheating and disconnect the loads.
Let the lab power supply cool down and make sure that the air can circulate
freely. The air outlet (13) should always be clean and dust-free; do not cover
the openings of the housing.
The maximum uninterrupted operating time of the lab power supply is 24 hours. After that
the lab power supply should be switched off until it has cooled down to ambient temperature.
Maintenance and cleaning
a) General care
• Disconnect the product from the mains socket and disconnect all connected devices before
you start cleaning it.
• The product requires no maintenance; Do not take it apart.
Live components may be exposed, if the covers are opened or parts removed (un-
less this can be done without tools).
• Do not use scouring, chemical or aggressive cleaning agents such as benzene, alcohol or
similar chemicals. These might attack the surface of the device. Furthermore, the fumes are
explosive and hazardous to your health. Moreover, you should not use sharp-edged tools,
screwdrivers or metal brushes, or the like for cleaning
• Clean the product with a soft, clean and dry cloth. Do not apply too much pressure to avoid
scratching the housing when cleaning. You can easily remove dust using a clean brush with
long, soft bristles.
b) Fuse Replacement
Switch off the lab power supply first, then remove all
connection cables from the lab power supply and re-
move the mains plug from the rear IEC connector (14).
Remove the mains plug of the lab power supply from
the mains socket.
• Remove the rear fuse holder (17) with a suitable screwdriver from
the bracket, as displayed.
• Replace the faulty fuse with a new fuse of the same type and with
the same rated current (see chapter “Technical data”).
• Squeeze the fuse cartridge carefully into the fuse holder.
• Then check that the lab power supply is working properly.
Malfunctions
The lab power supply does not work, the displays are blank.
• Check the power switch.
• Check if the IEC socket is properly connected to the power cord connector (14) at the rear
of the unit.
• Check the functionality of the mains connection (sockets, fuses, circuit breaker, etc.).
• Check that the proper mains voltage is applied.
Connected loads don’t work.
• Check polarity of the connection sockets (5 and 7).
• Check if the current limit is activated.
• Reduce the lab power supply load by removing a load.
• Check the specifications of the loads.
Disposal
Electronic devices are recyclable materials and do not belong in the household was-
te. Dispose of an unserviceable product in accordance with the relevant statutory
regulations.
Technical data
LB-153
BT-305
General information
Operating voltage
230 V/AC (±10%)
Frequency
50 Hz (±2 Hz)
Control range of output voltage
0 – 15 V/DC
0 – 30 V/DC
Control range of output current
0 – 3 A
0 – 5 A
Display accuracy
±0,5% ±1 digits
Operating time without interruption
max. 24 h
Fuse
1.0 A, 250 V - 5 x 25 mm 3.0 A/250 V - 5 x 25 mm
Protection class
I
Power cord length
1.8 m
Display
3-digit, red LED (voltage) and red LED (current)
Operating temperature/ humidity
0 bis +40 ºC, <80% rF
Storage temperature/ humidity
0 bis +40 ºC, <80% rF
Dimensions (W x H x D)
226 x 82 x 138 mm
Weight
1,2 kg
1,27 kg
Output voltage
No-load
≤0.03% ± 1 mV
Load
≤0.33%
Residual ripple
≤3 mVrms
Output current
No-load
≤0.03% ± 1 mA
±0.01% ± 1 mA
Load
≤0.33%
±0.2% ± 5 mA
Residual ripple
≤3 mArms
