Tektronix 323, Инструкция по эксплуатации

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TABLE 6-1
Power-Supply Ripple and Regulation
Calibration— Type 323
Power
Supply
Maximum
Ripple
Maximum output
change o f supply
( re g u la tio n )
-5 -V o lt
10 millivolts ±0 .0 3 volt
+ 5-Volt 10 millivolts ±0.025 volt
+ 14-Volt 150 millivolts ± 2 .8 volts
+ 100-Volt 150 millivolts ± 5 .0 volts
+ 175-Volt 500 millivolts ± 1 4 volts
b. CHECK— Precision DC voltmeter for power-supply out­
put change within the limits given in Table 6-1 while vary­
ing the DC power source as given above. Power-supply
test points are shown in Fig. 6-4A.
c. Disconnect the precision DC voltmeter.
d. Turn off the POWER switch temporarily and replace
the high-voltage cover. Replacement instructions are given
in the Maintenance section of this manual.
* 9 3
Lower Defl
Plate DC Level
R40
VAR V /D IV
BAL
'Centering
§ 1 Plate DC Level
9. Check Low Batteries Indicator
a. Change the following control settings:
Vertical POSITION
TIME/DIV
INTENSITY
POWER
Midrange
1 ms
Normal intensity
ON
b. Slowly decrease the output voltage of the variable
DC power supply.
c. CHECK— LOW BATT light begins to flash when vari­
able DC power supply output voltage is -f-6.25 volts, ±0.31
volt (use the precision DC voltmeter to monitor the applied
DC voltage at the EXT DC POWER jacks).
d. Return variable DC power supply output voltage to
+ 8 volts.
NOTE
If the internal batteries o f the Type 323 are
charged, the remainder o f this procedure can be
performed with battery powered operation.
Fig. 6 -5 . Location o f vertical adjustm ents (M a in b o a rd ).
11. Adjust Vertical X lO Balance O
a. Return the VARIABLE VOLTS/DIV control to CAL.
b. Position the trace to the center horizontal line with
the vertical POSITION control.
c. Pull the X lO VERT GAIN switch out. (Note: to pre­
vent changing knob position, the X lO VERT GAIN switch
can be actuated using the vertical POSITION control bracket
behind the front panel).
d. CHECK—Trace shift less than 1.5 division vertically.
e. ADJUST— VERT X lO BAL adjustment, R39 (see Fig.
6-5), to return the trace to the center horizontal line. Repeat
parts b through e for minimum trace shift as the X lO VERT
GAIN switch is pulled out.
f. Recheck step 10. If readjustment is necessary, recheck
this step also.
10.
Adjust Variable Volts/Division Balance
O
a. Position the trace to the center horizontal line with
the vertical POSITION control.
b. CHECK— Rotate the VARIABLE VOLTS/DIV control
throughout its range. Trace should not move more than
one division vertically (if the trace is not visible at all, preset
the VAR V/DIV BAL adjustment to bring the trace on screen).
c. ADJUST—VAR V/DIV BAL adjustment, R40 (see Fig.
6-5), for no trace shift as the VARIABLE VOLTS/DIV con­
trol is rotated. If necessary, use the vertical POSITION
control to keep the trace on screen during this adjustment.
12. Adjust Deflection Plate DC Level O
a. Push the X lO VERT GAIN switch in.
b. Connect the precision DC voltmeter from the collector
of Q163 (case of Q163; see Fig. 6-5) to chassis ground.
c. Rotate the vertical POSITION control fully clockwise
and note the meter reading. Then rotate the vertical POSI­
TION control fully counterclockwise and again note the
meter reading.
d. CHECK— Voltage range measured in part c centered
around + 5 0 volts.
6-9