Table; Check Other Power - Tektronix CURVE-TRACER 576 Instruction Manual

Performance Check/Calibration-Type 576
TABLE 5-3
Check Power Supply Voltage and Regulation
Total Output Location of
Noise and Test Point on
Line L.V . Regulator
Frequency Circuit Board
Ripple, Peak
Voltage Accuracy To Peak
-75 5mV Pi nK
-12.5 ±0.3 1 vo lt 5mV Pin I
V ari ab le -0.1 volts,+0.2 20 mV Pi n U
+4.0
vo lt (w ith
READO UT
I LL UM
control fu ll y
clockwise)
+5 ±0.25 vo lt 10 mV Pin
0
+12.5 ±0.31 volt 5m V Pin F
+ 15 ±0.75 vo lt 20 mV Pin Z
+100 ±2.5 vo lts 20 mV of
28kH z high PinE
vo ltage oscill a-
tor ri pple and
line f requency
ri pple
+225 ±9 vo lts 80 mV of Left arm of
28k Hz high R592 VERT
vo ltage oscill a-
OUTPUT
tor ri pple and GA IN (see
li ne f requency
Fig. 5-3 )
ri pple
3. Check Other Power Supply Voltages
a. Move the positive lead of the DC voltmeter to the
power supply test points (other than - 75 volts) listed in
Table 5-3. See Fig. 5-1 for pin locations. (Change polarity
of voltmeter for positive voltages.)
b. CHECK FOR - Meter reading of the power supply
voltage within the tolerance given in the accuracy column
of Table 5-3.
c. Disconnect the DC voltmeter lead s from the Type
576.
d. Connect the negative lead of the High Voltage DC
Voltmeter to ground (pin M of the L.V . REGULATOR
circuit board). Be sure the polarity of the meter is set for
measuring a negative voltage.
e. Set the meter for measuring - 4 kV.
5-6
Fig. 5-3. Location of high voltage test points on right side of
instrument.
f . Connect the positive lead of the meter to the arm of
the INTENSITY control, R883 (see Fig. 5-3), connected to
the white and purple wire.
g. CHECK FOR - High Voltage DC voltmeter read ing of
- 4000 volts ± 160 V ±error of meter (4 kV ±4% ± % error
of meter) .
h. Disconnect the High Voltage DC Voltmeter leads
from the Type 576.
i.
Connect the negative lead of the DC voltmeter to pin
W and the positive lead to pin Z of the DISPLAY AMP
circuit board (see Fig. 5-2). (Set the DC voltmeter for meas-
uring a negative voltage.)
j. Turn the HORIZONTAL switch through the three
positions given in Table 5-4.
k. CHECK FOR - Voltages given in Table 5-4 for each
setting of the HORIZONTAL switch ±0.5%.
I.
Connect the positive lead of the DC voltmeter t o pin C
of the DISPLAY AMP circuit board.
m. Turn the VERTICAL switch through the three posi-
tions given in Table 5-4.
®!