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Performance Tests
TAS 455 and TAS 465 Service Manual
4Ć27
High Frequency Ċ The following steps check trigger sensitivity at
100 MHz (TAS 455) or 150 MHz (TAS 465).
1. Remove the 10X attenuator from the test setup. Reconnect as shown in
Figure 4Ć14.
Sine Wave Generator
Precision Cable
50 W Terminations
DualĆinput
Coupler
Figure 4Ć14:ăTrigger Sensitivity Test Setup (Three)
2. Set the volts/div scale to 1 V.
3. Adjust the sine wave generator amplitude for a one division display at
25 MHz.
4. Set the sine wave generator frequency as follows:
H TAS 455 Ċ 100 MHz
H TAS 465 Ċ 150 MHz
5. Press the MAG button.
6. Set SRC to EXT <10>.
7. Press the SET LEVEL TO 50% button and confirm a stable display.
8. Add a 10X attenuator to the test setup as shown in Figure 4Ć15.
10X Attenuator
Sine Wave Generator
50 W Terminations
DualĆinput
Coupler
Precision Cable
Figure 4Ć15:ăTrigger Sensitivity Test Setup (Four)