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7.1.3 Adjusting Voltage and Current
The voltage and current are set using the two controls labeled “VOLTAGE” and “CURRENT”. These controls use high quality
digital encoders rather than potentiometers. Turn the controls clockwise to increase a setting or counter clockwise to decrease
a setting. The encoders allow fine or coarse control of the voltage or current setting. The speed at which you turn the controls
will determine the granularity of the setting. Turning at a slow rate will adjust the least significant digit of the parameter being
adjusted. Turning more rapidly allows coarse control to allow rapid changing of voltage or current.
If the output is disabled while an adjustment is being made the voltage and current setting will be shown on the normal output
off display. The new settings will take effect when the output on/off button is pressed.
If the output is on while an adjustment is being made the voltage or current will change in real time as the control is turned. A
special screen will be displayed during the adjustment as shown below. The screen will revert to the normal operating screen as
soon as the adjustment is complete. In the screens below the actual real-time output voltage and current is shown on the
bottom line and the set voltage or current is shown in the top line. In the cases below the power supply is current limiting as the
actual current matches the set current.
Note that the actual voltage or current is load dependent and, therefore, may not match the displayed set point.
7.1.4 Displaying Set Points
At any time during operation, set points can be recalled by pressing the voltage or current rotary control. This action displays
the set points in the same manner as they would be displayed during a set point adjustment but without actually changing
anything. Pressing the voltage control displays the voltage set point and pressing the current control displays the current set
point.
7.1.5 Adjusting Over Voltage, Over Current and Over Power Protection.
The over voltage protection (OVP), over current protection (OCP) and over power protection (OPP) features limit the maximum
output current and voltage to avoid damages to the unit under test (UUT). OVP and OCP may be set as shown below or may be
changed via the setup menus. OPP may only be changed in the setup menus. Note that Over Voltage and Over Current
protection can also be adjusted in the Setup menu – section 8.2.5.
If OVP, OCP, or OPP is set to maximum that protection will be disabled. Note: OVP, OCP, and OPP cannot be set to more than
10% over the maximum rating of the power supply.
To adjust OVP press and release Voltage. The following screen will appear:
Vset
v=100.0
V=88.2
i=3.500
OVP set
OVP = 12.00
iset
i=3.122
V=88.2 i-3.122
