Keithley 2400 Service Manual

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2400-902-01 (G - Feb 2006)

1-7 Model 2400 Series User’s Manual

Performance Verification

The “real” compliance condition can occur when the compliance setting is less than the highest

possible reading of the measurement range. When in compliance, the source output clamps at

the displayed compliance value. For example, if the compliance voltage is set to 1V and the

measurement range is 2V, the output voltage will clamp (limit) at 1V.

“Range” compliance can occur when the compliance setting is higher than the possible reading

of the selected measurement range. When in compliance, the source output clamps at the

maximum measurement range reading (not the compliance value). For example, if the

compliance voltage is set to 1V and the measurement range is 200mV, the output voltage will

clamp (limit) at 210mV.

Maximum compliance values

The maximum compliance values for the measurement ranges are summarized as follows:

Measurement

range

Maximum

compliance value

200mV

20V

200V

1µA

10µA

100µA

1mA

10mA

100mA

210mV

2.1V

21V

210V

1.05µA

10.5µA

105µA

1.05mA

10.5mA

105mA

1.05A

When the SourceMeter goes into compliance, the “Cmpl” label or the units label (i.e., “mA”)

for the compliance display will flash.

Determining compliance limit

The relationships to determine which compliance is in effect are summarized as follows. They

assume the measurement function is the same as the compliance function.

• Compliance Setting < Measurement Range = Real Compliance

• Measurement Range < Compliance Setting = Range Compliance

You can determine the compliance that is in effect by comparing the displayed compliance

setting to the present measurement range. If the compliance setting is lower than the maximum

possible reading on the present measurement range, the compliance setting is the compliance

limit. If the compliance setting is higher than the measurement range, the maximum reading on

that measurement range is the compliance limit.

Questions and Answers:

S
Sara MurphyAug 1, 2025
How to fix 'No Comm Link' error on Keithley Measuring Instruments?
- S
  Sheri LynnAug 1, 2025
  If you receive a 'No Comm Link' error because the front panel processor has ceased communication with the main processor, re-seat the two firmware ROMs, U15 and U16, located on the digital board.
N
Natalie ScottAug 17, 2025
What happens if ROM checksum test fails in Keithley 2400 Measuring Instruments?
- S
  sherry59Aug 17, 2025
  If the ROM checksum test fails, the firmware upgrade mode is automatically enabled.

Keithley 2400 Specifications

General

Model	2400
Category	SourceMeter
Voltage Source Range	±200 V
Power Output	20 W
Voltage Measurement Resolution	100 nV
Current Measurement Resolution	10 pA
Resolution	5.5 digits
Interfaces	GPIB, RS-232
Current Source Range	±1A
Current Measurement Range	±1A
Resistance Measurement Range	2 Ω to 200 MΩ
Display	Vacuum Fluorescent Display