Performance Verification
4–34
SPG 422 Service Manual (B034000 and above)
g. Check, using the 1780 waveform monitor, that the genlock input signal
has a signal to noise ratio better than 50 dB. (If this signal is not good
enough, you will need to find another signal source.)
h. Display CH B1 on the 1780 vectorscope.
i.
Check for less than 0.5
°
of jitter.
29. Pull-in Range
Subcarrier Frequency
±
20 Hz
a. Connect the equipment as shown in Figure 4–9.
b. Set the SPG 422 to burst lock, genlock loopthrough but do not terminate
the loopthrough.
c.
Set the Step Attenuator to 6 dB (actually 0 dB of attenuation).
d. Set the TG 2000 BG1 and AVG1 modules to NTSC. You must set each
generator.
e.
Set the TG 2000 AVG1 module to output a 0% flat field.
f.
Set the TG 2000 AVG1 to provide 20 Hz of subcarrier variation. Select
the Active Signal Parameters and select the Subcarrier to adjust it. See
the TG 2000/AVG1 manual for detailed instructions to make these
settings.
g. Set the 1780 to display CH A and CH B1 in parade format using
external reference.
h. Set the SPG 422 Genlock to loopthrough.
i.
Set the SPG 422 Black 1 to output a NTSC black burst signal with no
delay.
j.
Check that the SPG 422 is genlocked (front-panel External Ref LED is
lit).
k. Set the TG 2000 AVG1 to output the 0% flat field signal with –20 Hz
subcarrier variation.
l.
Check that the SPG 422 remains genlocked.
m. Set the TG 2000 AVG1 to output the 0% flat field signal with +20 Hz
subcarrier variation.
n. Check that the SPG 422 remains genlocked.
o. Return the TG 2000 AVG1 to a normal subcarrier signal.
30. Sync Lock Jitter
≤
0.6 nsec (0.75
°
at 3.58 MHz, 1
°
at 4.43 MHz, SNR >50 dB)
Summary of Contents for SPG 422
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