Tektronix DS1001, User Manual

Page: 24 / 130

Getting Started
1–8
DS1000 Series User Manual
Functional Check
To check that the television demodulator is operating correctly,
perform the following procedures:
1. Connect the television demodulator to power and wait a few
seconds for the power-on tests and initialization. If these tests pass,
the display will show the current frequency/channel setting.
2. Apply an RF signal feed from an appropriate television standard
for your model of television demodulator to the RF input. Use a
75
W
coaxial cable. The RF source should match the current
frequency/channel setting. If not, refer to the Operating Basics
section for information on selecting a new frequency/channel.
3. Connect the video output (VIDEO O/P) either to a picture monitor,
waveform monitor, or other monitoring equipment. Ensure that
this connection is terminated in 75
W
.
4. Check for a valid video display and, if possible, a nominal 1 Vpp
signal level.
5. Connect the audio outputs (AUDIO OUT R and AUDIO OUT L)
to a suitable audio monitoring device. For example, use the Lindos
LA102 Audio Measuring Set. Check for a nominal 0 dBm level.
6. Connect the IF output (45.75 IF on the DS1001 model or
38.9 MHz on the DS1002 and DS1003 models) to a 100 MHz
oscilloscope terminated in 75
W
.
7. Check for a modulated RF signal at 45.75 MHz.
8. Connect the 4.5 IF output (DS1001 model only) to a 100 MHz
oscilloscope terminated in 75
W
.
9. Check for a nominal 700 mVpp (+48 dBmV) signal.
This concludes the functional check. If your television demodulator
failed any check in this procedure, review your connections,
terminations, and instrument settings. A continued failure may
indicate the need for repair. Contact your service person or a
Tektronix, Inc field office for assistance.