The E4990A has three calibration types: user calibration, port extension compensation, and fixture compensation. Table below shows each device connection and its corresponding adapter selection and calibration. Calibration should be done according to the particular requirements of each device connection.
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Device Connection |
Adapter Selection |
Accessory |
Calibration (√ : required, - : not required) |
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User Calibration |
Port Extension Compensation |
Fixture Compensation |
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A. Connect a direct connection type test fixture to the four-terminal pair port of the E4990A and connect the device to the fixture. |
No adapter (NONE)
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16034E 16044A 16047A 16047D 16047E 16065A1 16089A1 16089B1 16089C1 16089D1 16089E1 |
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Open/Short |
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16034G 16034H |
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Open/Short/ Load (Load compensation is required when the frequency is more than 3 MHz) |
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B. Extend the four-terminal pair port of the E4990A with a 1-meter-long four-terminal pair configuration and connect the device. |
Four-terminal pair, 1 meter (4TP 1M)
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16048G and test fixture |
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Same as the fixtures are directly connected to the four-terminal pair port |
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16048G and 16452A |
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Short |
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16334A, 16451B |
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Open/Short/Load |
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C. Extend the four-terminal pair port of the E4990A with a 2-meter-long four-terminal pair configuration and connect the device. |
Four-terminal pair, 2 meters (4TP 2M) |
16048H and test fixture |
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Same as the fixtures are directly connected to the four-terminal pair port |
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16048H and 16452A |
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Short |
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D. Connect the 42942A directly to the four-terminal pair port of the E4990A, connect a dedicated test fixture to the 7-mm port, and then connect the device to the fixture contacts. |
42942A Terminal Adapter (7mm 42942A) |
42942A and 16092A 42942A and 16192A |
√ (perform when user-defined calibration kit is used) |
Open/Short |
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42942A and 16454A |
Short |
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E. Connect the 42942A directly to the four-terminal pair port of the E4990A, connect a coaxial cable to the 7-mm port, connect a test fixture, and then connect the device to the fixture contacts. |
42942A Terminal Adapter (42942A Extension) |
42942A, coaxial cable, and test fixture |
√ (use Keysight's calibration kit or user-defined calibration kit)
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√ |
Same as the fixtures are directly connected to the terminal adapter. |
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F. Connect the 42941A directly to the four-terminal pair port of the E4990A, connect a dedicated probe adapter to the 3.5-mm port, and then connect the device to the adapter contacts. |
42941A Impedance Probe (PROBE 42941A) |
42941A and dedicated probe adapter |
√ (perform when user-defined calibration kit is used) |
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Open/Short |
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G. Connect the 42941A directly to the four-terminal pair port of the E4990A, connect a coaxial cable to the 3.5-mm port, connect a test fixture, and then connect the device to the fixture contacts |
42941A Impedance Probe ( 42941A Extension) |
42941A and coaxial cable and test fixture |
√ (use Keysight's calibration kit or user-defined calibration kit) |
√ |
Required compensations differ from one test fixture to another. |
1 Although it has a cable, it falls into the category of direct connection type test fixture for adapter setup.
Other topics about Calibration