Performance Ve rification
Performance V
erification Procedures
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 1-9.)
You m ust perform the Self Calibration operation described below. If the
ambient temperature changes by more than 5 °C, you must perform the Self
Calibrati
on 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.
Self Test
This internal procedure is automatically performed every time the oscilloscope
is powered on. No test equipment or hookups are required. Verify that no error
messa
ges are displayed before continuing with this procedure.
Self Calibration
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
shou
ld 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
, and, for 4-channel models, channels 3 and 4).
2. Push the Utility button and select the Do Self Cal option to start the routine.
Th
e routine takes approximately one m inute to complete.
3. Verify that self calibration passed.
C
heck DC Ga in Accuracy
This test checks the DC gain accuracy of all input channels.
1. Set the DC voltage source output level to 0V.
2. Set up the oscilloscope using the following table:
Push menu button Select menu option Select setting
Default Setup
——
Channel 1
Probe 1X
Acquire Average 16
Source Channel under test
Measure
Type Mean
TBS1000 Series Oscilloscope Service Manual 4–3
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