Tabor 8020 - Amplitude Modulation (Model 8022)

5-10-12. Amplitude Modulation (model 8022)
Sensitivity Specifications: 2.5 Vp-p produces 100 % modu-
lation depth when carrier is set to 100 %.
AM Distortion: 1 % at 70 % AM with 1 KHz envelope and 1
MHz carrier.
AM Envelope Bandwidth: DC to 500 KHz.
Equipment: Function generator, Oscilloscope, Distortion
Meter, De- modulator
1. Set 8022 as follows:
CONTROL POSITION
Frequency 1.000 MHz
Amplitude 15.0 V
Offset 0.00 V
Trigger Mode Continuous
Display Modify CARR
Output Sine
Operating Mode AM
2. Connect 8022 output to oscilloscope input. Adjust oscil-
loscope vertical gain so that trace height is +/-2 vertical
divisions.
3. Set external function generator to output 1 KHz sine
waveform and connect external function generator to AM
IN connector.
4. Adjust amplitude of external generator until oscilloscope
displays 100 % modulation. Remove external generator
from AM input and verify that external generator ampli-
tude is 2.5 Vp-p +/-0.25 V.
5. Change external function generator to 1 KHz sine wave-
form and 1.2 Vp-p amplitude. Connect external generator
to 8022 AM IN connector.
6. Change external generator frequency setting from 1 KHz
to 500 KHz and 8022 frequency setting to 10.00MHz.
Verify that 8022 output did not decrease by more than 30
%.
7. Change 8022 frequency setting to 1 MHz. Change
external function generator settings to 1 KHz sine wave-
form and 1.7 Vp-p amplitude. Connect external generator
to 8022 AM IN connector.
8. Connect 8022 output through the AM de-modulator to
the distortion analyzer. Verify that distortion is less than 1
%.
Maintenance And Performance Tests Model 8020
Page 5-8