Tektronix TDS7054, Руководство по обслуживанию

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Performance Tests
4- 46
TDS7104 & TDS7054 Service Manual
Table 4- 7: Analog bandwidth
V ti l
Reference
lit d H i t l
Test frequency
Vertical
scale amplitude
(6 divisions) Horizontal
scale
TDS7054 TDS7104
- 3 db Limits
1 mV 6 mV 1 ns 450 MHz 500 MHz
≥
4.24 mV
2 mV 12 mV 1 ns 500 MHz 600 MHz
≥
8.48 mV
5 mV 30 mV 1 ns 500 MHz 750 MHz
≥
21.2 mV
10 mV 60 mV 1 ns 500 MHz 1000 MHz
≥
42.4 mV
20 mV 120 mV 1 ns 500 MHz 1000 MHz
≥
84.8 mV
50 mV 300 mV 1 ns 500 MHz 1000 MHz
≥
212 mV
100 mV 600 mV 1 ns 500 MHz 1000 MHz
≥
424 mV
200 mV 1.2 V 1 ns 500 MHz 1000 MHz
≥
848 mV
500 mV 3 V
1
1 ns 500 MHz 1000 MHz
≥
2.12 V
1
1 V 6 V
1
1 ns 500 MHz 1000 MHz
≥
4.24 V
1
1
If your generator cannot output 6 divisions of amplitude, determine its maximum
output at the Test frequency, and use this for the reference amplitude. The - 3 db
limit can be calculated as: 0.707
×
reference amplitude.
f. Display the test signal: Do the following subparts to first display the
reference signal and then the test signal.
H
From the button bar touch MEAS ; then select the Time tab.
H
Touch the Freq button to measure the frequency of the current
channel.
H
Select the Ampl tab. Touch the Pk-Pk button.
H
Touch Close button.
H
Set the generator output so the CHx Pk-Pk readout equals the
reference amplitude in Table 4--7 that corresponds to the vertical
scale set in substep
d .
H
Press the front-panel PUSH TO SET 50% as necessary to trigger a
stable display. At full bandwidth, you may also want to make small,
manual adjustments to the trigger level. You can use the
Trigger
LEVEL knob to do this. (Full bandwidth varies with TDS model as
is shown in Table 4--7).
g. Measure the test signal:
H
Set the frequency of the generator, as shown on screen, to the test
frequency in Table 4--7 that corresponds to the vertical scale set in
substep
d . See Figure 4--20.