•
•
•
Temperature
Compensation
Calibrations
Brief Performance Checks
10. Verify that the delayed trigger is operational, confirming that the follow-
ing statements are true.
• Rotating the trigger LEVEL control changes the delayed trigger level
readout.
• Rotating the trigger LEVEL control through its range triggers and
untriggers (intensified zone
displayed and not displayed) the
delayed sweep. Leave the signal untriggered.
• Pressing the SET LEVEL
TO
50% button triggers the signal, the
trigger
level readout indicates approximately 2.7
V,
and the intensi-
fied zone
is
displayed.
11. Press the HORIZONTAL MENU button and set DELAY
to
Off.
12. Set the sec/div scale to 50 ms.
13. Press the
TRIGGER MENU button and set
MODE
to
Single Sequence
and confirm the following statements are true.
• There
is
no waveform displayed.
•
Pressing the RESET S SEQ button causes one sweep of the
waveform display to occur.
14.
Set the sec/div scale to 1 ms.
15.
Set MODE
to
Auto Level.
16. Disconnect the probe from the oscilloscope.
The procedures that follow allow you to quickly compensate the calibration
of the oscilloscope for any external temperature variations. This ensures the
most accurate measurements. No test equipment is required to perform
these procedures .
•
•
Optimum instrument performance depends on the recommended
20 minute minimum warm-up time prior to performing the following
calibration
routines. All calibration routines require a successful
completion
(no "failed" message) .
The Temperature Compensation
Calibrations affect the accuracy of
the
display system; therefore, they should only be performed by a
qualified technician.
Horizontal Sweep Path
1.
Press the AUTOSET button.
2.
Press the UTILITY button and select CAL from the main menu.
3.
Select Horizontal Sweep Path from the sub menu, initiating the routine .
TAS 475 and TAS 485 Service Manual
4-9
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