16494A-002 データシートの表示（PDF） - Unspecified

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16494A-002

Precision Source/Measure Unit

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08 | Keysight | B2900A Series Precision Source/Measure Unit – Data Sheet

Overview: Why Use an SMU?

Resource integration reduces measurement error

An SMU is an instrument that combines the capabilities of a

current source, a voltage source, a current meter and a voltage

meter (along with the capability to switch easily between these

various functions). Because the source and measurement

circuitry is closely integrated, the user can achieve far better

measurement performance with less measurement error than

would be possible by using various independent instruments to

make the same measurement.

Feedback mechanism stabilizes voltage and

current sourcing

Since SMUs have the ability to very accurately measure their own

current and voltage output, they have many advantages over

conventional power supplies. All SMUs have internal feedback

loops that provide instantaneous feedback to the sourcing

circuitry, which in-turn allows the SMU output to remain accurate

and stable even if the load conditions change unexpectedly.

Limit (compliance) feature prevents device damage

SMUs also possess a voltage and current limit (compliance)

feature that allows the user to set limits and to protect devices

from damage caused by excessive voltage or current. Although

the SMU normally continues to function when it reaches the

user-specified limit value, it can also be set to shutdown just like

the over current protection (OCP) and over voltage protection

(OVP) functions do on a power supply.

Accurate timing control of source and measure-

ment resources

The integration of the source and measurement resources in an

SMU allows much tighter synchronization than would be possible

with separate instruments. Moreover, the B2900A Series provides

very flexible triggering options that allow the measurements

points to be defined independently from the sourced current or

voltage waveform. On two channel units you can operate both

channels in synchronization or independently, and under remote

control you can trigger multiple units in unison using a group

trigger signal.

Feedback

A

V

High

Low

Source block:

Precision voltage and current source/sink

with sweep, pulse and AWG capabilities.

Voltage/current limit capability is also

available.

Measurement block:

Precision voltage and current meter with

high speed digitizing capability.

Simplified block diagram of the Keysight B2900A Series

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