Tektronix 1740A Series, Руководство пользователя

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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–11
2.
Power Supply Operation
Requirement – Stable operation over an ac input range of 90 - 250 V.
a. Vary the autotransformer from low-line to high-line voltage (90 - 132 V
for 110 V, or 180 - 250 V for 220 V operation).
b. Check – for stable instrument operation over the prescribed voltage
range.
c. Set the autotransformer to the nominal mains voltage.
3. Trace Rotation Range and Graticule Illumination
Requirement – Rotation of 1
°
from the horizontal.
a. Enter the CRT menu and select TRACE (CRT menu).
b. Position the trace to the graticule baseline.
c. Check – that the TRACE ROTATE control (bezel knob) moves the trace
1
°
from the graticule baseline.
d. Adjust the TRACE ROTATE control (bezel knob) for a level trace across
the graticule baseline.
e. From the CRT menu select DISPLAY (CRT menu).
f. Check – that the SCALE control changes the graticule illumination from
completely extinguished to fully illuminated.
g. Adjust the SCALE control (bezel knob) for the desired graticule
illumination.
h. Exit the CRT menu.
4. Input Channel DC and Restorer Offsets
Requirement – DC Offset between input channels 1 IRE (7 mV PAL).
DC Restorer Offset between input channels 1 IRE (7 mV PAL).
a. Turn off the DC REST (front panel) and then position the signal
blanking level to the CRT graticule baseline.
b. Select PARADE (front panel). Note: CH-A, CH-A1, CH-A2, and
CH-A3 INPUTs should be selected.
c. Enter the GAIN menu and select X10 (CRT menu). If desired, press the
CLEAR MENU button (front panel) to remove the readout.
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