User Manual - TRS-RenTelco

Appendix B: Performance Verification
Table B -10 uses the values of DC700 DC0 from the example Table B -9 on
page B -23.
Table B- 10: Example of Amplitude measurement results
Characteristic G B R
Measured White level 699.0 mV 696.2 mV 698.3 mV
Measured Black level 0.0 mV -1.7 mV -0.5 mV
Measured White-to-Black
Amplitude (MWL -MBL)
699.0 mV 697.9 mV 698.8 mV
Lower White limit value
Upper White limit value
Lower Black limit value
Upper Black limit value
Lower White-to-Black limit
value
Upper White-to-Black limit
value
{(700.1 mV) x (0.980)} - 8 mV = 678.1 mV
{(700.1 mV) x (1.020)} + 8 mV = 722.1 mV
(0.0mV)-(8mV)=-8.0mV
(0.0 mV) + (8 mV) = +8.0 mV
{[(700.1 mV) x (0.0 mV)] x (0.982)} - (3 mV) = 684.5 mV
{[(700.1 mV) x (0.0 mV)] x (1.018)} + (3 mV) = 715.7 mV
In this example, all three channels meet their White, Black, and White-to-Black
specifications.
Check Noise Floor
Measurement Accuracy
This test verifies the noise floor of the three VM5000 channels (CH1/G, CH2/B,
CH3/R) and digitizers. Noise floor affects the linearity of the noise measurement
between -56 dB and -32 dB.
Required
equipment
Prerequisites
A standard PC
VGA to 5 BNC cable
75 Ω precision BNC terminations (3)
The VM5000 (including MIU) must warm up for at least 20 minutes
before doing this test.
1. If the VM5000 Option VGA application is not already running, start it now:
from the Tekscope menu bar, select File > Run Application > VM5000
VGA Video.
2. In the VM5000 application, select the default setup: from the VM5000 menu
bar, select File > Recall Default Setup.
B-24 VM5000 Automatic Video Measurement Set User Manual