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

User Connections

Q= L1

RCxtint eR+

where: C = model-dependent internal capacitance (see below); L = inductance of the load; Rext = equivalent series

resistance of the load; Rint = model-dependent internal resistance (see below):

6671A 6672A 6673A 6674A 6675A

C= 44,000 µF 44,000 µF 12,000µF 7,000 µF 2,100 µF

Rint= 1.8 mΩ 2.2 mΩ 4 mΩ 14 mΩ 30 mΩ

If the Q is greater than 0.5, inductive loads will ring with the output capacitance and will be damped according to the

following equation:

δ =

Battery Charging

The power supply’s OVP circuit has a downprogrammer FET that discharges the power supply output whenever OVP trips.

If a battery (or other external voltage source) is connected across the output and the OVP is inadvertently triggered or the

output is programmed below the battery voltage, the power supply will sink current from the battery. To avoid this, insert a

reverse blocking diode in series with the ⊕ output of the supply. Connect the diode cathode to the + battery terminal and the

diode anode to the supply ⊕ output terminal. The diode may require a heat sink.

Local Voltage Sensing

Your power supply was shipped set up for local sensing. This means that the supply will sense and regulate its output at the

output terminals, not at the load. Since local sensing does not compensate for voltage drops across screw terminals, bus

bars, or load leads, local sensing should only be used in applications that require low output current or where load regulation

is not critical.

Local sensing is obtained by connecting the +LS sense terminal to the +S analog connector pin and the pin and the -LS

sense terminal to the -S analog connector pin. The power supply is shipped with these connections made.

Note If the sense terminals are left unconnected, the voltage at the bus bars will increase approximately 3 to 5%

over the programmed value. Since it is measured at the sense terminals, the voltage readback will not

reflect this increased output.

Remote Voltage Sensing

The dashed lines in the wiring diagrams illustrate remote voltage sensing. The remote sense terminals of the power supply

are connected directly to the load rather than to the output terminals. This allows the supply to automatically compensate for

the voltage drop in the load leads as well as to accurately read back the voltage directly across the load.

Setting Up Remote Sense Operation

Remote sensing is obtained by removing the jumpers connecting the +LS sense terminal to the +S analog connector pin and

the -LS sense terminal to the -S analog connector pin. The power supply is shipped with these jumpers connected.