SDI7 module adjustment procedures
To adjust the SDI output
amplitude
Usethisproced
ure to adjust the SDI output amplitude:
1. Restart the instrument in Factory mode:
a. Press and hold the MODULE, ENTER,andFront Panel ENABLE
buttons simultaneously.
b. Continue holding the b
uttons until the message TG8000 Booting...
displays.
c. When the message TG8000 Booting... displays, release the MODULE
and ENTER buttons. Continue holding the Front Panel ENABLE
button.
d. When the message TG8000 Start up with Factory Mode displays,
release the Front Panel ENABLE button.
2. Press the MODULE button until SDI7[x-1]: STATUS appears.
3. Press the up (▲)ordown(▼) arrow button to select TRIGGER OUTPUT,
andthenpresstheENTER button.
4. Press the right (►) arrow button to select System Clock, and then press the
ENTER buttontoconfirm the selection.
5. Press the down (▼) arrow button to display Source: CH[x].
6. Press the right (►)arrowbuttontoselectSource: CH1, and then press the
ENTER buttontoconfirm the selection.
7. Press the BACK button to exit the TRIGGER OUTPUT submenu.
8. Connect a 50 Ω cable from the TRIGGER OUTPUT on the SDI7 module
(through the BNC to SMA adapter (with or without the 6 dB pad) to the
trigger direct input on a sampling osci
lloscope.
9. Connect a 1 m high-bandwidth cable from the SIGNAL 1A output of the
module to the TCA75 BNC on the oscilloscope adapter.
10. Press the MODULE button until SDI7[x-1]: STATUS appears.
11.
Use the up (▲)ordown(▼) arrow button to selec
t CALIBRATION,and
then press the ENTER button.
12. Press the right (►)arrowbuttontoselect20 Bits Square, and then press
the ENTER button.
13. If necessary, set the oscilloscope:
Time/Div: 2ns
Volts/Div: 100 mV
Averaging: 16
Record Length: 4000 points
14. On the s cope, select Measurement 3, Pulse-Amplitude, and then Amplitude to
measure the amplitude on the flat part of the long pulse.
TG8000 Multiformat Test Signal Generator Service Manual 14–7
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