Tektronix WFM7020 Technical Reference

Video and General Performance Verification Procedures
7. Log either Pass
or Fail in the test record.
8. Leave test setup as is for the next test.
External Re fe
rence Lock
Range
Vary the time base of the reference to measure lock range.
1. Adjust the AVG1 time base offset to –50 ppm. Verify that the readout in
the lower-left corner of the waveform monitor display does not indicate an
unlocked signal. It is normal for the system to momentarily lose lock when
the time base is changed.
NOTE. The
waveform display will not be stable because the SDI time base is
not in sync with the reference.
2. Increas
e the negative time base offset until the waveform monitor cannot
sustain lock. Record the maximum offset capability in the test record.
3. Repeat
steps 1 and 2,but use positive offsets to test the positive end of the
lock range.
4. Reset
the AVG1 Module parameters to remove the timebase offset.
External Reference
Formats Supported :
Tri-Levels (WFM7020 and
WFM7120 only)
Check that the unit under test can reference to NTSC and PAL while viewing
digital signals.
1. Disconnect the AVG1 signal from the Reference input, and connect a 1080i
59.94 Tri-Level Sync signal from the AWVG1.
2. Check that the lower-left corner of the waveform monitor display shows the
proper standard for the reference.
3. Check that the Waveform and Vector displays are locked.
4. Log either Pass or Fail in the test record.
5. Disconnect the 1080i 59.94 Tri-Level Sync signal from the reference input.
External Reference Lock in
Presence of Hum, Bi-Level
Apply a 0 dB hum signal to the Reference and verify that the waveform monitor
still locks correctly.
1. Set the waveform monitor to the factory presets. (See page 60, Restore the
Factory Presets.)
2. Connect the TG2000 black burst signal to the video input of the AVC1. Route
the video output of the AVC1 (not the precision video output) to one of the
waveform monitor REF inputs. Terminate the other REF input.
Waveform Monitors Specifications and P erformance Verification 91

Tektronix WFM7020 Specifications

General

Brand	Tektronix
Model	WFM7020
Category	Monitor
Language	English