Tektronix 7B92 Instruction Manual page 34

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m. CALIBRATION-If the 7B92 does not meet the
requirements given in part 1, check the adjustment of R940
and R950 (Calibration step 12) and R920 (Calibration step
4).
n. Disconnect all test equipment from the oscilloscope
system.
yl13. Check
HF
SYNC Operation
a. Connect the output of the high·frequency constant-
amplitude sine-wave generator to the 7 A 19 Input with a 5X
GR attenuator, GR-to-BNC male adapter, and BNC T-
connector. Connect the output of the T-connector to the
MAIN TR IG IN connector with a 42-inch BNC cable.
b. Change the following control settings:
Main Triggering
MODE
TIME/DIV OR
DLY TIME
DL Y'D Time/Division
Delayed Triggering
LEVEL
SLOPE
COUPLING
SOURCE
HF SYNC
10 ns
10 ns (press in for NORMAL
Sweep Display Mode)
IN-RUNS AFTER
DLY TIME
(+)
DC
INT
c. Set the high-frequency sine-wave generator and the
7 A 19 Volts/Div switch for a 0.5 division display at 100
megahertz.
yd. CHECK-Stable CRT display can be obtained with
the MAIN TRIGGERING COUPLING switch set to AC, AC
LF REJ, and DC (Rotate the MAIN TRIGGERING LEVEL
control for optimum display).
e. Set the high-frequency sine-wave generator for 0.5
division display at 500 megahertz. Set the TIME/DIV OR
DL Y TIME and DL Y'D Time/Division switches to .5 ns
(press in DL Y'D Time/Division switch for Normal Display
Mode).
®
Vf. CHECK-Repeat part d.
g. Change the following control settings:
Volts/Div
7A19 Amplifier
.1 V
Scans bv Outsource-Options
=>
Calibration-7B92 Service
7B92 Time Base
Main Triggering
SOURCE
TIME/DIV OR
DLY TIME
DL Y'D Time/Division
EXT
10 ns
10 ns (press in for NORMAL
Sweep Display Mode)
h. Set the high-frequency sine-wave generator for a
one-division display (100 mY) at 100 megahertz.
vi.
CHECK-Repeat part d.
j. Change the TIME/DIV OR DLY TIME and DLY'D
Time/Division switches to .5 ns (press in DL Y'D Time/
Division switch for the NORMAL Display Mode).
k. Set the high-frequency sine-wave generator for a
one-division display (100 mV at 500 megahertz).
vI.
CHECK-Repeat part d.
m. CALIBRATION-If the 7B92 does not meet the
requirements given in part d, check the adjustment of
R740, R750, and R959 (Calibration step 11).
n. Remove the BNC cable from the MAIN TRIG IN
connector and connect it to the DLY'D TRIG IN
connector.
o. Change the following control settings:
Main Triggering
SOURCE
LEVEL
TIME/DIV OR
DLYTIME
DL Y'D Time/Division
INT
Adjust for TRIG'D
light on
20
ns
10 ns (press in for DL Y'D
Sweep Display Mode)
p. Set the high-frequency sine-wave generator and the
7 A 19 Volts/Div switch for a 0.5-division display at 100
megahertz. Press and release the Delayed Triggering LEVEL
control to DLY'D SWP TRIGGERABLE (knob out).
Vq. CHECK-Rotate the Delayed Triggering LEVEL
control into the HF SYNC area. Check that a stable display
can be obtained with the Delayed Triggering COUPLING
switch set to AC and DC (Rotate the Delayed Triggering
4-13