Section 2: General operation
Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-18
2657A-901-01 Rev. B/December 2012
Voltage and current
The following table lists the source and measure limits for the voltage and current functions. The full
range of operation is explained in
(on page 4-4).
Model 2657A source-measure capabilities*
Range Source Measure
Range Source
Measure
200 V
± 202 V
± 202 V
1 nA
± 1.01 nA
± 1.01 nA
500 V
± 505 V
± 505 V
10 nA
± 10.1 nA
± 10.1 nA
1500 V
± 1515 V
± 1515 V
100 nA
± 101 nA
± 101 nA
3000 V
± 3030 V
± 3030 V
1 µA
± 1.01 µA
± 1.01 µA
10 µA
± 10.1 µA
± 10.1 µA
100 µA
± 101 µA
± 101 µA
1 mA
± 1.01 mA
± 1.01 mA
2 mA
± 2.02 mA
± 2.02 mA
20 mA
± 20.2 mA
± 20.2 mA
120 mA
± 121.2 mA
± 121.2 mA
* Maximum power = 182 W
Compliance limits
When sourcing voltage, the Model 2657A can be set to limit current or power. Conversely, when
sourcing current, the Model 2657A can be set to limit voltage or power. In steady-state conditions, the
Model 2657A output will not exceed the limit. The maximum limit is the same as the maximum values
listed in the following table.
The limit circuit will limit in either polarity regardless of the polarity of the source or limit value. The
accuracy of the limit opposite in polarity from the source is diminished unless the instrument is in
(on page 2-21). The maximum limits are based on source range. For more information, see
(on page 4-2).
The limit operation of the instrument changes dependent on the source mode (current or voltage),
load, and the configured limits (current, voltage, and power). It is important to distinguish both the
current and voltage limits from the power limit. As the names imply, the current limit restricts the
current for sourced voltage, and the voltage limit restricts the voltage for a sourced current. The
power limit, however, restricts power by lowering the present limit in effect (voltage or current) as
needed to restrict the SMU from exceeding the specified power limit. For additional details on using
limits, including load considerations when specifying both a current (or a voltage) limit and a power
limit, see
(on page 4-4).
Summary of Contents for 2657A
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