TTI CPX400 Instrucciones página 9

The operation of both outputs is identical; the following description applies to both.
Switching On
The power switch is located at the bottom left of the front panel.
To fully disconnect from the AC supply unplug the mains cord from the back of the instrument or
switch off at the AC supply outlet; make sure that the means of disconnection is readily
accessible. Disconnect from the AC supply when not in use.
Setting Up the Output
With the POWER switch on ( l ) and the OUTPUT switch off the output voltage and current limit
can be accurately preset using the VOLTAGE and CURRENT controls; the upper meter shows
the set voltage and the lower meter shows the set maximum current.
When the OUTPUT switch is switched on, the OUTPUT ON lamp and the CV (constant voltage)
lamp light; the upper meter continues to show the set voltage but the lower meter now shows the
actual load current.
Constant Voltage
The output voltage is adjusted using the coarse and fine VOLTAGE control; the CURRENT
control sets the maximum current that can be supplied.
The CV lamp lights to show constant voltage mode.
Constant Current
If the load resistance is low enough such that, at the output voltage set, a current greater than the
current limit setting would flow, the power supply will automatically move into constant current
operation. The current output is adjusted by the CURRENT control and the VOLTAGE controls
set the maximum voltage that can be generated.
The CI lamp lights to show constant current mode.
Instantaneous Current Output
The current limit control can be set to limit the continuous output current to levels down to 10mA.
However, in common with all precision bench power supplies, a capacitor is connected across the
output to maintain stability and good transient response. This capacitor charges to the output
voltage and short-circuiting of the output will produce a current pulse as the capacitor discharges
which is independent of the current limit setting.
Power Limit
The maximum output at different voltage settings is limited by the power envelope illustrated
below:
8
42V
V ol ts
20V
0V
C P X 400
P O W E R E N V E LO P E
10A
A m ps
Operation
20A