Calibration and Verification
Calibration
3
3-5
3-3. Calibration
The standard 5520A has no internal hardware adjustments. Oscilloscope Options have
hardware adjustments; see Chapter 6. The Control Display prompts you through the
entire calibration procedure. Calibration occurs in the following major steps:
1. The 5520A sources specific output values and you measure the outputs using
traceable measuring instruments of higher accuracy. The 5520A automatically
programs the outputs and prompts you to make external connections to appropriate
measurement instruments.
2. At each measure and enter step, you can press the OPTIONS, and BACK UP STEP
softkeys to redo a step, or SKIP STEP to skip over a step.
3. You enter the measured results either manually through the front panel keyboard or
remotely with an external terminal or computer.
Note
Intermixed with the "output and measure" procedures are internal 5520A
calibration procedures that require no action by the operator.
4. The 5520A computes a software correction factor and stores it in volatile memory.
5. When the calibration process is compete, you are prompted to either store all the
correction factors in nonvolatile memory or discard them and start over.
For routine calibration, all steps except frequency and phase are necessary. All the
routine calibration steps are available from the front panel interface as well as the remote
interface (IEEE-488 or serial). Frequency and phase calibration are recommended after
instrument repair, and are available only by way of the remote interface (IEEE-488 or
serial). Remote commands for calibration are described later in this chapter.
3-4. Starting Calibration
From the front panel, you start calibration by pressing the S key, followed by the
CAL softkey twice, then 5520A CAL. The CALIBRATION SWITCH on the 5520A rear
panel can be in either position when you begin calibration. It must be set for ENABLE to
store the correction factors into nonvolatile memory.
After you press the 5520A CAL softkey, the procedure works as follows:
1. The 5520A automatically programs the outputs and prompts you to make external
connections to appropriate measurement instruments.
2. The 5520A then goes into Operate mode, or asks you to place it into Operate mode.
3. You are then prompted to enter into the 5520A the value read on the measurement
instrument.
Note
At each measure and enter step, you can redo a step by pressing the
OPTIONS, and BACK UP STEP softkey, or skip over a step by pressing the
SKIP STEP softkey.
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