mode, a regulated output voltage is provided. The output voltage remains constant as the load
increases up until the point where the preset current limit is reached. At that point, the output
current becomes constant and the output voltage drops in proportion to further increases in load.
The point is indicated by the front panel LED indicators. The crossover point is reached when
the CV indicator goes off and the CC indicator comes on.
Similarly, crossover from the constant current to the constant voltage mode automatically
occurs from a decrease in load. A good example of this would be seen when charging a 12-volt
battery. Initially, the open circuit voltage of the power supply may be preset for 13.8 volts. A low
battery will place a heavy load on the supply and it will operate in the constant current mode,
which may be adjusted for a 1 amp charging rate. As the battery becomes charged, and its
voltage approaches 13.8 volts, its load decreases to the point where it no longer demands the full
1 amp charging rate. This is the crossover point where the power supply goes into the constant
voltage mode.
3-1 Front Panel
22 Power switch: ON/OFF the power input.
①
V LED display: Indicates the MASTER output voltage.
③
V LED display: Indicates the SLAVE output voltage.
②
A LED display: Indicates the MASTER output current.
④
A LED display: Indicates the SLAVE output current.
⑤
Voltage control: for adjustment of the output voltage of the MASTER supply. Also functions
as adjustment control for the maximum output voltage of the SLAVE supply when either
parallel or series tracking operation.
⑦
Voltage control: for adjustment of the output voltage of the SLAVE supply when the
independent operation.
⑥
Current control: for adjustment of the output current of the MASTER supply. Also functions
as adjustment control for the maximum output voltage of the SLAVE supply when either
parallel or series tracking operation.
⑧
Current control: for adjustment of the output current of the SLAVE supply.
⑩
C.V indicator: lights when the MASTER supply is in the constant voltage operation, in either
the Series or Parallel Tracking mode, both the MASTER AND SLAVE supplies are in the
constant voltage operation.
12 C. V indicator: lights when the SLAVE supply is in the constant voltage operation.
11 C. C. indicator: lights when the MASTER supply is in the constant current operation.
13 C. C. indicator: lights when the SLAVE supply is in the constant current operation.
Also lights when the TRACKING PARALLEL mode is selected.
⑨
Over load indicator: lights when load on 5 volt supply becomes too large.
14 15 TRACKING Mode Switches:
Two push-button switches that select INDEPENDENT mode, series tracking mode, or parallel
tracking mode as follows:
a. When both switches are disengaged (out), the unit is in the INDEPENDENT mode and the
MASTER and SLAVE power supplies are completely independent from one another.
b. When the left switch is engaged (in) and the right switch is disengaged (out), the unit is in
the TRACKING SERIES mode.
Summary of Contents for Precision AC- DC Power Supply
Page 12: ...Fig 3 2 Rear Panel...
