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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–27
i.
Replace the linearity signal on the CH-A INPUT with the output from
the leveled sine wave generator. Leave the loop-through terminated.
j.
Enter the FILTER menu and select FLAT. If desired, press the CLEAR
MENU button to remove the readout.
k. Adjust the leveled sine wave generator frequency to 3.58 MHz
(4.43 MHz PAL), and the generator amplitude for a 100 IRE (700 mV
PAL) signal display on the 1740A/1750A/1760–Series.
l.
Enter the FILTER menu and select DIFF. If desired, press the CLEAR
MENU button (front panel) to remove the readout.
m. Check – for
1 IRE (7 mV PAL) of signal display.
n. Enter the FILTER menu and select FLAT. Exit the FILTER menu.
21. Amplifier Linearity
Requirement – Differential Phase:
1
°
. Differential Gain:
1%.
(Measured with a 140 IRE (1 V PAL) linearity signal (5-step, 10-step, or
ramp) with 40 IRE (300 mV PAL) subcarrier.
a. Replace the leveled sine wave generator output on the CH-A INPUT
with the television signal generator linearity signal. Leave the loop-
through terminated.
b. Select VECTOR DISPLAY.
c.
Enter the GAIN menu and select X5 and VARIABLE ON. If desired,
press the CLEAR MENU button to remove the readout.
d. Use the VAR GAIN and VECTOR PHASE controls (bezel knobs) to
position the vector dot (representing the subcarrier on the staircase) to
the 0
°
mark on the compass rose.
e.
Check – that the dots are overlaid
1
°
phase and
1% gain.
22. Quadrature Phase and R–Y Balance and Display
Requirement – Quadrature Phasing Error:
0.5%.
a. Replace the linearity signal on the CH-A INPUT with the television
signal generator color bar signal. Leave the loop-through terminated.
b. Enter the GAIN menu and select X1. Set the VARIABLE GAIN control
to maximum (bezel knob).
c.
Use the VECTOR PHASE control (bezel knob) to position the burst to
the 0
°
mark.
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Содержание 1740A Series
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