Tektronix TPS2000 Series, Service Manual

Page: 45 / 106

Performance Verification
TPS2000 Series Digital Storage Oscilloscopes Service Manual
4- 3
Performance Verification Procedures
Before beginning these procedures, two conditions must first be met:
H
The oscilloscope must have been operating continuously for twenty minutes
within the operating temperature range specified in the
Specifications
section
on page 1--8.
H
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.
Remove signals from all channels.
2. Press the UTILITY button and select the Do Self Cal option to start the
calibration. This routine can take up to five minutes 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 steps:
Press menu button Select menu option Select setting
1. DEFAULT SETUP — —
2. CH 1 (or whatever channel
is currently being tested). Voltage Probe 1X
Self Test
Self Calibration
Check DC Gain Accuracy