Appendix B: Performance Verification
B- 4
VM700T Option 01 (NTSC) & Option 11 (PAL) User Manual
This procedure is to be used as a check for proper system level adjustment of the
measurement set. It checks the frequency response flatness over the operating
frequency range.
Test Equipment Required
H
Leveled sine-wave generator.
H
Termination, 75
Ω
precision BNC.
H
Coaxial cable, 75
Ω
high-quality noise free; 1-meter length.
Procedure: Measure Sinewave
1.
Connect the leveled sine-wave generator output to the measurement set
channel to be tested (start with channel A). Terminate the channel loop-
through output connection in 75
Ω
.
2.
Set the leveled sine-wave generator for 50 kHz at an output level of 500 mV
into 75
Ω
.
NOTE
. If the example leveled sine-wave generator is being used, the output level
should be set for –3.81 dBm.
3.
Press the Measure hard key; then, if necessary, display the measurement set
Diagnostics directory by pressing the Diags soft key. In diagnostics, run the
sine-wave measurement application by pressing the Measure~Sinewave soft
key.
4.
After the measurement application has initialized, turn averaging on by
pressing the Average hard key until the Average hard key light is lit. When
the display stabilizes, press the Freeze hard key. The Delta Amp reading
should remain at 0. If the Delta Amp reading changes, press the Freeze key
again, as many times as needed, until the Delta Amp reading remains at 0.
This is now the reference to which all other measurements are compared.
5.
Set the leveled sine-wave generator for a frequency of 4.43 MHz; do not
change the output level.
6.
To speed up the response to the frequency change, toggle the Average hard
key off. Turn averaging on again after the display has re-stabilized.
7.
Check that the amplitude is within
±
0.5% (Delta Amp of
±
0.5% or less) of
the 50 kHz reference level stored in step 4.
8.
Set the leveled sine-wave generator for 5.8 MHz; do not change the output
level.
Measure Sinewave
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