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

Connecting Supplies in Auto-Parallel

Auto-Parallel Wiring (Figure 4-5e). Figure 4-5e shows how power supplies can be auto-paralleled for increased current

output. Up to three supplies can be connected for auto-parallel operation. Use heavy enough load leads so that the absolute

voltage difference between the ⊕ output terminals of the "master" supply and the ⊕ output terminal of the first "slave"

supply is kept under 2 V at rated current. This also applies to the voltage difference between the ⊕ output terminals of the

first and second "slave" supplies. If remote sensing is necessary, connect the remote sense terminals of the "master" supply

as shown by the dashed lines in Figure 4-5e. See "Remote Voltage Sensing" for more information.

Auto-Parallel Programming. Only the first supply in the series (the "master") is programmed; the supplies that are

connected to the master automatically track its output. However, the voltage and OVP settings of the slave supplies must

be set higher than the operating voltage of the master supply. This ensures that the slave supplies will operate in CC mode

when tracking the output of the master supply. Be sure to set the output current of the slave supplies to zero, because all

current programming inputs (GPIB, front panel, and external voltage) are additive. Functions such as status, voltage

readback, and current readback can still be read back individually for each supply.

If a "slave" supply experiences a desired shutdown condition (such as caused by overtemperature or overcurrent), it does

not automatically shut down all other supplies. You must first enable remote inhibit (RI) and discrete fault indicator (DFI)

operation. It is recommended that you use the RI and DFI functions to automatically shut down all supplies whenever one

supply experiences a shutdown condition. See "Fault/Inhibit Operation" in "Appendix D - Digital Port Functions" for

wiring information and "Questionable Status Group" in the "Programming Guide" for programming information.

 Analog Connector ó Slave Supply ì Master Supply

öProgram only the master. Set slave output and OVP voltage slightly higher than the master to ensure that slave stays in

CC mode

ú Load

÷ Load Connection

A Only local sensing permitted

B Connect for remote sensing (optional)

Figure 4-5e. Series 668xA Auto-Parallel Connection (Remote Sensing Optional)

Connecting Supplies in Series

Floating voltages must not exceed ± 60 Vdc. No output terminal may be more than 60 V from chassis

ground.

Figure 4-5f illustrates how power supplies can be connected in series for increased voltage capability. Series connections

are straightforward in this case.