Performance Verification Procedures; Self Test; Self Calibration; Check Dc Gain Accuracy - Tektronix TDS2022C Service Manual

Performance Verification Procedures

Self Test

Self Calibration

Check DC Gain Accuracy

TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual
Before beginning these procedures, two conditions must be met:
The oscilloscope must have been operating continuously for twenty minutes
within the operating temperature range specified in the Environmental
Performance table. (See Table 9.)
You must perform the Self Calibration operation described below. If the
ambient temperature changes by more than 5 °C, you must perform the Self
Calibration operation again.
The time required to complete the entire procedure is approximately one hour.
WARNING.
Some procedures use hazardous voltages. To prevent electrical
shock, always set voltage source outputs to 0 V before making or changing any
interconnections.
This internal procedure is automatically performed every time the oscilloscope
is powered on. No test equipment or hookups are required. Verify that no error
messages are displayed before continuing with this procedure.
The self calibration routine lets you quickly optimize the oscilloscope signal path
for maximum measurement accuracy. You can run the routine at any time, but you
should always run the routine if the ambient temperature changes by 5 °C or more.
1. Disconnect all probes and cables from the channel input connectors (channels
1, 2, 3, 4).
2. Push the Utility button and select the Do Self Cal option to start the routine.
The routine takes approximately one minute to complete.
3. Verify that self calibration passed.
This test checks the DC gain accuracy of all input channels.
1. Set the DC voltage source output level to 0 V.
2. Set up the oscilloscope using the following table:
Push menu button
Default Setup
Channel 1
Acquire
Measure
Select menu option
—
Probe
Average
Source
Type
Performance Verification
Select setting
—
1X
16
Channel under test
Mean
29