Installation - 3

OUTPUT 1/OUTPUT 2

CONNECTOR

-S - + +S

TWIST LEADS

TWIST PAIR

WIRE RESISTANCE

LENGTH

MUST BE

UNDER 20

INCHES

+

LOAD

_

FIXTURE

CONNECTIONS

Figure 3-4. Remote Sense Connections with Test Fixture

Load Regulation and Voltage Drop in the Remote Sense Leads

The sense leads are part of the dc source’s feedback path and must be kept at a low resistance to maintain optimal performance. One way to accomplish this is to use larger diameter wires for the sense leads (see Table 3-2).

If this is impractical, you can account for the voltage regulation and readback error that will occur when using higher resistance remote sense leads. The voltage load regulation and readback error can be calculated using the following formula:

ΔV =

VLD+ (

RS+

) + VLD- (

RS-

)

RS+ + 251

RS- + 184

 

 

 

 

where: VLD+ and VLD- are the voltage drops in the + and − load leads. RS+ and RS- are the resistances of the + and − sense leads.

Minimizing the load lead resistance reduces voltage drops VLD+ and VLD-.ΔV can be further minimized by decreasing the resistance of the sense leads (RS+ and RS-) as much as possible.

Maintaining Stability while Remote Sensing

The remote sense bandwidth and slew rate of standard dc power sources are adequate for compensating for load lead voltage drop for slow to moderate rates of load changes. However, the high pulsed current draw of digital cellular phones presents a challenge to standard dc power sources operating in remote sense mode. Their bandwidth and slew rate are not adequate for dealing with the 0.05 to 0.2 amp/μs slew rates imposed by these devices. A large voltage transient occurs at the load, due to the inability of the dc source to keep up with the rate of load change.

The dc source effectively compensates for load lead voltage drops resulting from very high slew rate load current transitions. This keeps the remotely sensed output voltage at a relatively constant level. For 0.05 amp/μs to 0.2 amp/μs slew rate loading in typical test applications, the transient voltage is reduced more than an order of magnitude over that of other standard dc sources.

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Agilent Technologies 66111A, 66311B, 66309B manual Load Regulation and Voltage Drop in the Remote Sense Leads
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66111A, 66309B, 66311B, D specifications

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