Agilent Technologies 664xA, 665xA, 667xA, 668xA, AGILENT Model 6653A: 3145A-00551, Model 6641A: 3217A-00111, Model 6645A: 3215A-00111, Model 6651A: 3130A-00171, Model 6652A: 3201A-00381, Model 6654A: 3148A-00391, Model 6655A: 3152A-00176, Model 6671A: 3129A-00218, Model 6672A: 3138A-00101, Model 6673A: 3138A-00101, Model 6674A: 3133A-00161, Model 6675A: 3138A-00101, Model 6680A: 3302A-00101, Model 6681A: 3250A-00101, Model 6682A: 3339A-00101, Model 6683A: 3339A-00161, Model 6684A: 3339A-00101

Front Panel Operation 87

Figure 5-2. Typical Power Supply Operating Curve

Programming Voltage

To program the output for 4.5 volts, proceed as follows:

■ Press . The display will change from meter mode to indicate VOLTS.

■ Press . If you discover a mistake before pressing , erase the incorrect value with the backspace

key .

■ The display will return to the meter mode and indicate 0.000 volts.

■ Press to enable the output (Dis annunciator turns off). The VOLTS display will indicate 4.500 volts.

Note The power supply must be programmed for a minimal current in order to increase the output voltage

beyond zero. Normally, there is sufficient idle current to do this. If the power supply does not respond or

the CC annunciator turns on, go to “Programming Current” and set the current to a small value.

■ Now raise the voltage by pressing .Note that the voltage increases by a specific increment (depending on the

voltage programming resolution) each time you press the key and increases rapidly as you hold down the key. To lower

the voltage, press .

■ Try raising and lowering the voltage by rotating the Voltage control clockwise and then counterclockwise. Note how the

output responds as compared to using the Entry keys.

Try to program a voltage greater than the VMAX for your supply (see "Supplemental Characteristics" for your particular

model in Chapter 1). Note that the display shows OUT OF RANGE.

Programming Overvoltage Protection

Overvoltage protection guards the load against voltages that reach a specified value above the programmed output voltage.

Setting the OVP Level

Assuming that you have programmed the power supply for 4.5 volts, you can set the OVP level to 4.8 volts as follows:

■ Press . The display will change from meter mode to indicate 0V, followed by the present OVP value.

■ Press .

■ The display will return to the meter mode and indicate the output (4.500 volts).

■ Press again. The display will now indicate 0V 4 . 800.

■ Press to return to the meter mode.