Tektronix TDS 420A, Руководство по обслуживанию, Страница: 96 / 288

Performance Tests
4- 28
TDS 420A, TDS 430A & TDS 460A Service Manual
Table 4- 4: Analog Bandwidth (TDS 430A and TDS 460A)
Vertical Scale Reference Amplitude Horizontal Scale Test Frequency Limits
100 mV 600 mV (6 divisions) 2 ns 400 MHz
≥
424 mV
1 V
4
2 V (2 divisions) 2 ns 400 MHz
≥
1.414 V
500 mV 2 V (4 divisions) 2 ns 400 MHz
≥
1.414 V
200 mV 1.2 V (6 divisions) 2 ns 400 MHz
≥
848 mV
50 mV 300 mV (6 divisions) 2 ns 400 MHz
≥
212 mV
20 mV 120 mV (6 divisions) 2 ns 400 MHz
≥
84 mV
10 mV 60 mV (6 divisions) 2 ns 400 MHz
≥
42 mV
5 mV 30 mV (6 divisions) 2 ns 400 MHz
≥
21 mV
2 mV 12 mV (6 divisions) 2 ns 250 MHz
≥
8.4 mV
1 mV 6 mV (6 divisions) 2 ns 100 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.
e. Display the test signal: Do the following subparts to first display the
reference signal and then the test signal.
H
Press MEASURE ; then press the main-menu button Select
Measurement for CHx
.
H
Now press the side menu button more until the menu label Pk-Pk
appears in the side menu (its icon is shown at the left). Press the
side-menu button
Pk-Pk .
H
Press CLEAR MENU .
H
Set the sine wave generator output (if necessary, use 10X attenua-
tors) so the CHx Pk-Pk readout equals the reference amplitude in
Table 4--3 (TDS 420A) or Table 4--4 (TDS 430A and TDS 460A)
that corresponds to the vertical scale set in substep d.
H
Press the front-panel button SET LEVEL TO 50% as necessary to
trigger a stable display.
f.
Measure the test signal:
H
Increase the frequency of the generator output (leveled output) to the
test frequency in Table 4--3 (TDS 420A) or Table 4--4 (TDS 430A
and TDS 460A) that corresponds to the vertical scale set in
substep d.
H
Set the horizontal
SCALE
to 5 ns (TDS 420A) or 2 ns (TDS 430A
and TDS 460A).
H
Press SET LEVEL TO 50% as necessary to trigger the display.