HDVG7 module adjustment procedures
To adjust the HDVG7
output amplit
ude
Use this proced
ure to adjust the HDVG7 output amplitude:
1. Set the HDVG7 module for a 75% Color Bar signal output:
a. On the TG8000, press the MODULE button until the HDVG7 module
main menu is displayed.
b. Press the BARS button until 75% Color Bars is displayed.
c. Press the ENTER button to confirm the selection.
2. Recall the Factory Default preset as follows:
a. Press the u p (▲)ordown(▼) arrow button to select RECALL.
b. Press the left (◄)orright(►) arrow button to select Factory Default.
c. Press the ENTER button to recall the factory default settings.
d. Press the BACK button to return the TG8000 main menu.
3. Connect a 1 m high-bandwidth ca
ble from the SIGNAL 1 output of the
module to the TCA75 BNC on the oscilloscope adapter.
4. Connect a 50 Ω cable from the SIGNAL 2 output on the HDVG7 module
(through the BNC to SMA adapter (with or without the 6 dB pad) to the
trigger direct input on a sampling oscilloscope.
5. If necessary, set the oscilloscope as follows:
Time/Div: 2ns
Volts/Div: 100 mV
Averaging: 1
Record Length: 4000 points
6. On the scope, select Measurement 3, Pulse-Amplitude, and then Amplitude to
measure the amplitude on the flat part of the long pulse.
7. Right click on the mea surement readout, and select Show Statistics and Show
Annotations from the pop-up menu.
8. Note the expected average value, which is indicated by the letter μ, displayed
on the oscilloscope.
9. Press the Clear Data button on the oscilloscope and wait a bout 5 seconds
before proceeding to the next step.
10. Record the average value, which is indicated by the letter μ,inthe
Signal 1
amplitude row Before adjustment value column of the HDVG7 output
amplitude table.
NOTE. If you entered the attenuation factor into the scope at the end of
the amplitude characterization pr
ocedure, then the scope will display the
multiplication result.
13–8 TG8000 Multiformat Test Signal Generator Service Manual
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