Allftek AF Series, User Manual

NOTE 
 

The up/down keys change the LSB of the voltage or current (typically 10mV or 1mA) each time they are pressed. If the key is 
held down for more than 1 second, the power supply will automatically step up/ down until the key is released. The up/down step 
rate will increase if the key is held down for more than 2 seconds. 
The up/down step function can only be used when the power supply is in the metering mode. The function is disabled when the 
power supply is in the programming mode (i.e. when + Vset, +Iset, - Vset, -Iset or -Iset, is pressed). 
The power supply can be programmed by the numeric entry keys or the up/down step function even when the selected output is 
disabled. 
 

4.3 Enabling/Disabling the output 

The selected output channel can be turned on and off from the front panel. The output on/off key toggles both the +output and –
output on and off simultaneously. The “.” key toggles the 5V or 3.3V output on and off. An output disabled by the output on/off 
key will be have as if it were programmed to zero volts. 
 

4.4 Overload protection for of 5V or 3.3V output 

When the 5V or 3.3V output current is approximately 20 percent above the current output rating or if the output is shorted, the 
overload protection circuit will be activated and the output will be disabled. To reset the output, first clear the condition that 
caused the overload then press the “.” (on/off ) key to enable the output to its previous state. 
 
 

5. CALIBRATION 
 

Calibration steps: 
 

Equipment required needed for calibration: DMM, such as Fluke model 45 or HP 34401A. 
 
Step 1: Simultaneously press the “8” and the “ -

▼

” keys on the Keypad and the following message will Appear on the LCD: 

CALIBRATION