Agilent Technologies E3631-90002, User Manual, Page: 149 / 166

Chapter 7 Tutorial
Extending the Voltage
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Extending the Voltage
The power supply may be able to provide voltages greater than its rated
maximum outputs if the power-line voltage is at or above its nominal value.
Operation can be extended up to 3% over the rated output without damage
to the power supply, but performance can not be guaranteed to meet
specifications in this region. If the power-line voltage is maintained in the
upper end of the input voltage range, the power supply will probably operate
within its specifications. The power supply is more likely to stay within
specifications if only one of the voltage or current outputs is exceeded.
Series Connections
Series operation of two or more power supplies can be accomplished up to
the output isolation rating (240 Vdc) of any one supply to obtain a higher
voltage than that available from a single supply. Series connected power
supplies can be operated with one load across both power supplies or with a
separate load for each power supply. The power supply has a reverse
polarity diode connected across the output terminals so that if operated in
series with other power supplies, damage will not occur if the load is
short-circuited or if one power supply is turned on separately from its series
partners.
When series connection is used, the output voltage is the sum of the voltages
of the individual power supplies. The current is the current of any one power
supply. Each of the individual power supplies must be adjusted in order to
obtain the total output voltage.
In the Agilent E3631A the two 25V supplies can be operated in series to obtain
one 0 - 50V supply. The power supply can be put in “Track” mode and then
the output will be twice that shown on the front panel. The current will be
that of either the + 25V supply or the -25V supply.