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Brief Performance Checks
TAS 455 and TAS 465 Service Manual
4Ć9
Verify the External Trigger
1. Press the TRIGGER MENU button; set MODE to Normal and SRC to
EXT <1>. Confirm that no sweep is displayed.
2. Install the probe on the EXT TRIG connector. Connect the probe tip to
PROBE COMP on the frontĆpanel; connect the probe ground to the
ground barrel of an unused input BNC.
3. Press the SET LEVEL TO 50% button.
4. Verify that the main sweep is triggered and a single trace is displayed.
5. Press the AUTOSET button.
6. 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 warmĆup 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.
The Horizontal Sweep Path routine takes about 20 seconds to comĆ
plete its initial calibrations. Once complete, two dots are displayed. The
displayed dots are used for the next horizontal calibration steps.
NOTE
The following steps use both the General Purpose Knob and the
TOGGLE button to make adjustments. The General Purpose Knob
performs two functions: to adjust gain and centering. Pressing the
TOGGLE button selects the function of the General Purpose Knob.
4. Use a combination of the TOGGLE button and the General Purpose
Knob to position the two dots eight divisions apart, centered horizontally
(see Figure 4Ć3).
Temperature
Compensation
Calibrations