Specifications

1
How do I put the power supply in the
constant current mode?
The power supply cannot be “put”
into the constant current mode. The
output settings of the power sup-
ply combined with the ohmic value
of the particular load determine
whether or not the power supply
is in constant current.
ie: The power supply inherently
resides in the constant voltage
mode. If the output voltage were
set to 24 volts and a 6 Ω load were
placed across the output terminals,
Ohm’s Law would require that
4 amps would flow (24 V/6 Ω). This
presumes that the constant current
setting of the power supply were set
to a value greater than 4 amps; lets
say 5 amps. Now, if the 6 Ω load were
replaced by a 2 Ω load, Ohm’s Law
would suggest that 12 amps (24 V/
2 Ω) would flow. However, the power
supply is set to go into constant cur-
rent at 5 amps. Therefore, the actual
output voltage would be 10 volts
(2 Ω x 5 A). The power supply will
now remain in constant current for
valuesofload=0Ω≤R<4.8Ω.Once
the ohmic value of the load becomes
greater than 4.8 Ω (24 V/5 A), the
power supply will again revert to
constant voltage operation at the
value of 24 volts.
More detailed specifications at www.agilent.com/find/power
186
Power Products
Applications Information
2
I have 208 VAC, 3φ phase power; can it be
used to operate a product requiring 208 V
single phase?
Yes, see below.
3
Why are the required Watts and
VA so different?
Watts is a scalar quantity which is
frequently used to measure system
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VA on the other hand IS the scalar
quantity resulting from multiplying
the magnitudes (rms) of the vector
Earth
(Safety Ground)
NL
120 Volts (Typ) 208 Volts (Typ)
Rear of Instrument
Note: Connections are made
from phase to phase.
Instrument requires an
ac input voltage in the
window 191-250 VAC
C Phase
A Phase
B Phase
Assume V (nominal) = 208 Vac
208 V @ 8% low = 191 V
208 V @ 12% high = 233 V
(Instrument operates between 191 & 250 VAC)
instrument will not operate on a 120 VAC line
10 Most frequently asked questions
about using DC power products
657xA/667xA connection to a 3-phase line
10 Most frequently asked questions about using DC power products
AC Power and Load Connections
Power Products Terms