Aim TTi EL302P Manuel D'instructions page 7

Output Terminals
All power connections are made from the front panel.
The load should be connected to the positive (red) and negative (black) terminals marked
OUTPUT. Both are fully floating and either can be connected to ground.
The terminal marked
RS232
9–pin D–connector for PC remote control with the following connections:
Pin
1
2
3
4
5
6
7
8
9
Connect to a PC with a cable which has pins 2, 3 and 5 wired plus pins 1, 4 & 6 and pins 7 & 8
linked at the PC end.
Setting Up the Output
With the POWER switch on (
accurately preset using the VOLTAGE and CURRENT controls; the left-hand meter shows the set
voltage and the right-hand meter shows the set maximum current.
When the
preset voltage but the right-hand meter now shows the actual load current.
Constant Voltage
The output voltage is adjusted using the coarse and fine VOLTAGE controls; the coarse control
changes the voltage in 100mV steps and the fine control in 10mV steps. The CURRENT control
sets the maximum current that can be supplied; the control changes the current limit in 10mA
steps.
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 CC 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.
6
is connected to the chassis and safety earth ground.
Name
DCD
TXD
RXD
DTR
GND
DSR
RTS
CTS
–
l
) and the
output switch is switched on, the ON lamp lights; the left-hand meter still shows the
Description
Linked to pins 4 and 6
Transmitted data from instrument
Received data to instrument
Linked to pins 1 and 6
Signal ground
Linked to pins 1 and 4
Linked to pin 8
Linked to pin 7
No internal connection
output off the output voltage and current limit can be
Connections
Operation