Tektronix 067-0599-00 Instruction Manual page 24

Calibration—067-0599-00
Set the Type 576 VARIABLE COLLECTOR SUPPLY to
100% and measure the voltages as in the table below:
Horizontal Horizontal DMM Reading
Volts/Div Volts Minimum Maximum
100 1k 995 V 1005 V
50 500 497.5V 502.5 V
20 200 199. V 201 V
10 100 99.5V 100.5 V
5 50 49.75 V 50.25 V
2 20 19.9V 20.1 V
1 10 9.95 V 10.05 V
5 5 4.975 V 5.025 V
2 2 1.99 V 2.01 V
A . 1 0.995 V 1.005 V
5 5 0.4975 V 5025 V
c. Check HORIZONTAL BASE VOLTS, within 0.5%.
Move the DMM red (+) lead to the 9-6 wire on the 2nd
wafer of the FUNCTION switch.
Measure the following voltages:
Horizontal Horizontal DMM Reading
Volts/Div (Base); Volts (Base) Minimum | Maximum
.05 5 0.4975 0.5025
a 1 0.995 1.005
2 2 1.99 2.01
5 5 4.975 5.025
1 10 9.95 10.05
2 20 19.9 20.1
Set the Type 576 VARIABLE COLLECTOR SUPPLY to
0%. .
13. STEP GENERATOR
a. Setup
Set the Cal Fixture STEP GENERATOR switch to .05 V.
Connect a jumper wire from pin X to pin S on the Cal
Fixture circuit board. Connect the DMM black (—) led to pin
S and red (+) lead to pin AE.
4-8
b. Adjust Ampl Bal, within 2 mV.
Adjust R231 for 0.000 V on the DMM, within 1 mV. Re-
move the jumper.
c. Check Amplifier Gain, within 0.5%.
Move the DMM red lead to pin X. Set the 576 STEP
OFFSET switch to .05 V.
Adjust the 576 OFFSET MULT for DMM reading as
close to 500 mV as possible. Move the DMM red lead to pin
AE. Check the voltage according to the following table.
Cal Fixture
Step Generator Switch DMM Reading
2V 250 mV + 1.25 mV
1V 500 mV + 2.5mV
0.5V 1V+5.0mV
0.2V 2.5V + 12.5 mV
0.1V 5V + 25mvV
0.05 V 10V + 50mV
14. PULSE
a. Adjust 200 us Cal, within 3%.
Set the test scope differential comparator Volts/Div to
100 mV, with V, set to zero, dc coupling and the time base
to 50 us/Div.
Connect a X1 probe from the + Input of the comparator
to TP278 on the Main circuit board. Adjust R244 for a
200 us sweep time (pulse width).
b. Adjust .5 V Swp Cal, within 2%.
Leaving the probe at TP278, adjust R275 for 5 divisions
of vertical deflection. Set the comparator Volts/Div to 10 mV
and Comparison Voltage (V,) to 0.250. Set V, range to
O—1 V and — (minus).
Position the start of the ramp on screen. Switch V, be-
tween + and —, and readjust R275 to position the start of
the ramp and the end of the ramp at the same position
vertically on the graticule, within 0.5 division.
c. Adjust .5 V Pulse Cal, within 2%.
REV JUN 1985
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