Vertical System - Tektronix 2432 Service Manual

Performance Check and Functional Verification Procedure
2432 Service
VERTICAL SYSTEM
NOTE
Before performing the steps in this subsection, perform the INITIAL FRONT PANEL CONTROL SETUP at the
beginning of this procedure.
EQUIPMENT REQUIRED (see Table 4-1)
Leveled Sine-Wave Generator (Primary) (Item 1)
Leveled Sine-Wave Generator (Secondary) (Item 2)
Calibration Generator (Item 3)
Power Supply (Item 4)
Coaxial Cable (Item 10)
Precision Coaxial Cable (Item 11)
1. Verify CH 1 and CH 2 50
Q
OVERLOAD
Protection.
a. Recall the Initial Front-Panel Setup, labeled "FPNL"
(see step i in "INITIAL SETUP" at the start of this pro-
cedure). Make the following changes to the front-panel
setup:
Set:
CH 1 VOL TS/DIV
CH 2 VOL TS/DIV
Select VERTICAL MODE
1V
1V
Set: CH 2 Off
Select CH 1 COUPLING/INVERT
Set:
son
ON:OFF OFF
Select CH 2 COUPLING/INVERT
Set:
son
ON: OFF OFF
b. Connect the Power Supply (Power Supply should be
turned off) to the CH 1 OR X input connector via a BNC
female-to-dual banana adapter and a 50-n BNC cable.
c. Using the CH 1 VERTICAL POSITION control, align
the trace to the bottom graticule line.
4-6
1 OX Attenuator (Item 13)
SX Attenuator (Item 14)
2X Attenuator (Item 15)
1 OX Probe (Item 16)
1 X Probe (Item 17)
Dual-Input Coupler (Item 18)
d. Turn on the Power Supply.
e. Adjust the Power Supply output level until the CH 1
trace rises to 1 division above the center graticule
line (5 V).
f. Select CH 1 COUPLING/INVERT and set
son
ON:OFF to ON.
g. VERIFY-For a period of 1 minute, the readout
display does not indicate any overload condition (50n
OVERLOAD).
h. Set
son
ON: OFF to OFF and the CH 1 VOL TS/DIV
to 5 V.
To prevent damage to the input circuitry when in
50-il DC coupling mode, the 20V Power Supply
should be turned off immediately if automatic OVER-
LOAD switching does not occur within 15 seconds
after applying the power source and setting the 50-il
coupling on in part j.