Tektronix WFM700 Series, Service Manual

Page: 68 / 194

Performance Verification
2- 36
WFM700 Series Waveform Monitors Service Manual
This test checks the jitter error (for frequencies greater than 2 times the Clock
BW setting). This procedure is only applicable for a WFM7M Input Module.
Performance Requirement. This test verifies performance characteristics and is
listed in the test record.
NOTE
. If this test is performed out of sequence or the sequence of tests has been
interrupted (such as power off or input from another module was selected),
perform the steps in this note to prepare the instrument to continue testing.
a. Connect the SD video generator to INPUT B using a 75
8
cable.
b.
Set the SD video generator for a 525-format 100% color bar signal.
c. Press the INPUT button and select Input B .
d. Press the EYE button.
e. Press the INPUT button and select Input A .
1. Install the 50
8
N-to-BNC adapter on the RF generator output.
2. Connect the RF generator output to INPUT A using a 75
8
cable. Imped-
ance matching is not important for this test.
3. Set the RF generator as follows:
Frequency 741.7582 MHz
Output Level 0 dB
Frequency Modulation OFF
LFGEN2 Frequency 40 Hz
LFGEN2 Waveshape SINE
Phase Modulation Source LF2
Phase Deviation 1.57 RADIANS
RF Output ON
Phase Modulation ON
4.
Press the
EYE
button.
5.
Touch the
Clock BW:
soft key. On the resulting screen, touch the
10 Hz
soft
key and then the Done soft key.
6. Touch the 3 Eye soft key ( 3 Eye selected).
Eye Pattern Display Jitter
Attenuation Error (WFM7M
only)