3-2 DC Current Source Operation Model 6220/6221 User’s Manual
Return to Section 3 topics
Current source output capabilities
• Nine ranges to source current from 100fA to 105mA.
• Compliance can be set from 0.1V to 105V in 10mV steps.
• Maximum output power is 11W.
• Four quadrant (source and sink) source operation
Source ranges
Each source range has 5% overrange capability. Each source range and its maxi-
mum output is listed in Table 3-1. A source range can be selected manually, or
autorange can be used.
Manual ranging – A fixed source range can be selected manually using the
RANGE and
keys. When selecting a fixed range, select the lowest (best)
possible range that will accommodate the output current. For example, if sourcing
12mA, select the 20mA range.
Autorange – For front panel operation, the AUTO key is a single action control.
When pressed, the best range is selected for the displayed source value. For remote
operation, autorange is always active when it is enabled, and the Model 622x will
automatically select the best (lowest) source range for the source value.
NOTE More information on “Autorange” is provided on
page 3-11. The commands for ranging are listed in Table
3-2.
Table 3-1
Source ranges and maximum outputs
Source
Range
Max
Output
Source
Range
Max
Output
Source
Range
Max
Output
2nA ±2.1nA 2µA ±2.1µA 2mA ±2.1mA
20nA ±21nA
20µA ±21.µA 20mA ±21mA
200nA ±210nA
200µA ±210µA 100mA ±105mA
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