Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-27
b. Match the trigger source to the channel selected:
H Press TRIGGER MENU.
H Press the main-menu button Source.
H Press the side-menu button that corresponds to the channel selected.
c. Set the input impedance of the channel:
H Press VERTICAL MENU; then press the main-menu
button Coupling.
H Press the side-menu button Ω to toggle it to the 50 Ω setting.
d. Set the vertical scale: Set the vertical SCALE to one of the settings
listed in Table 4--3 (TDS 420A) or Table 4--4 (TDS 430A and
TDS 460A) not yet checked. (Start with the 100 mV setting.)
Table 4- 3: Analog Bandwidth (TDS 420A)
Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits
100 mV 600 mV (6 divisions) 5ns 200 MHz ≥424 mV
1V
4
2 V (2 divisions) 5ns 200 MHz ≥1.414 V
500 mV 2 V (4 divisions) 5ns 200 MHz ≥1.414 V
200 mV 1.2 V (6 divisions) 5ns 200 MHz ≥848 mV
50 mV 300 mV (6 divisions) 5ns 200 MHz ≥212 mV
20 mV 120 mV (6 divisions) 5ns 200 MHz ≥84 mV
10 mV 60 mV (6 divisions) 5ns 200 MHz ≥42 mV
5mV 30 mV (6 divisions) 5ns 200 MHz ≥21 mV
2mV 12 mV (6 divisions) 5ns 150 MHz ≥8.4 mV
1mV 6 mV (6 divisions) 5ns 95 MHz ≥4.2 mV
4
If the oscilloscope does not trigger in step 2e, change the trigger coupling to DC for this Vertical Scale setting.
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