Tektronix 1740A Series, User Manual

Page: 139 / 368

Performance Verification
4–36
1740A/1750A/1760 – Series Service Manual
m. Connect the precision high-frequency terminator to the Device Under
Test connector on the RF Bridge.
n. Check – that the frequency response from 0 MHz to 6 MHz is
40 dBm.
o. Return the spectrum analyzer frequency marker to 6 MHz if it was
moved.
p. Remove the precision high-frequency terminator from the RF Bridge.
q. Connect the Device Under Test connector on the RF Bridge to the
1740A/1750A/1760–Series CH-A INPUT. Terminate the CH-A
loop-through with the same precision high-frequency terminator used in
step p.
r. Select CH-A INPUT.
s. Check – that the Reference Level Readout on the spectrum analyzer is
40 dBm.
t. Repeat parts q. through s. for each Input channel (CH-A1, CH-A2,
CH-A3, CH-B, CH-B1, CH-B2, CH-B3, and EXT REF).
u. Connect the Device Under Test connector on the RF Bridge to the
1740A/1750A/1760–Series PIX OUT connector.
v. Check – that the Reference Level Readout on the spectrum analyzer is
30 dBm.
w. Remove all cables and terminators from the 1740A/1750A/1760–Series.
This completes the 1740A–Series Performance Verification procedure.
35. SCH Phase Mode (1750A–Series, 1760–Series Option SC Only)
Requirement – Absolute Accuracy: 5
°
. Color Frame Range: 70
°
.
a. Connect the color bar signal from the TSG-170A to the CH-A INPUT.
Terminate the loop-through in 75
b. Connect the TSG-170A Black Out to the EXT REF INPUT and
terminate the loop-through in 75 .
c. Select SCH DISPLAY.
d. Center the burst dot using the VERT and HORIZ POS controls. Position
the burst vector to 0
°
using the VECTOR PHASE control (bezel knob).
e. Select EXT REF (front panel) and then reposition the burst vector to 0
°
using the VECTOR PHASE control.
f. Check – that the SCH dots are on the compass rose.
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