Handheld and Benchtop Instruments Basic Service
1
PS280 and PS283 Power Supplies
The Tektronix PS280 and PS283 Laboratory DC Power Supplies are multifunc-
tion benchtop or portable instruments. These regulated triple output power
supplies provide one fixed 5 V, 3 A output suitable for powering logic circuits
and two variable 0 to 30 V outputs useful in a wide variety of test and exper-
imental uses.
The current output of the PS280 varies from 0 to 2 A. The current output of the
PS283 varies from 0 to 1 A. In all other respects, the instruments are identical.
Unless otherwise noted, descriptions and procedures in this manual apply to both
instruments.
The front panel switches provide three modes of operation for the PS280 and
PS283 power supplies:
Independent mode: the output voltage and current of each supply is
controlled independently.
Series mode: the variable outputs are connected in series and the controls of
the MASTER power supply adjust the voltages or currents of both supplies.
Series mode allows the supplies to vary from 0 to 60 V at 0 to 2 A for the
PS280 and 0 to 60 V at 0 to 1 A for the PS283.
Parallel mode: the variable outputs are connected in parallel and the controls
of the MASTER power supply adjust the voltages or currents of both
supplies. Parallel mode allows the supplies to vary from 0 to 4 A at 0 to
30 V for the PS280 and 0 to 2 A at 0 to 30 V for the PS283.
Figure 1: PS280 DC Power Supply
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