Performance Verification
VX4792 User Manual
6. Check external AM operation with +1 V AM input: Check that the DMM
reading is between 2.375 V and 2.625 V (100% modulation).
7. Adjust function generator offset for 0 V:
a. Disconnect the 50 terminator from the DMM.
b. Disconnect the coaxial cable from the function generator output.
c. Connect the function generator output to the DMM.
d. Adjust the function generator offset for a 0.00 V DMM display.
e. Disconnect the DMM from the function generator output.
f. Install the test setup (see Figure F–11 and step 4).
8. Check external AM operation with 0 V AM input: Check that the DMM
reading is between 1.125 V and 1.375 V (50% modulation).
9. Adjust function generator offset for –1.00 V:
a. Disconnect the 50 terminator from the DMM.
b. Disconnect the coaxial cable from the function generator output.
c. Connect the function generator output to the DMM.
d. Adjust the function generator offset for a –1.00 V DMM display.
e. Disconnect the DMM from the function generator output.
f. Install the test setup (see Figure F–11 and step 4).
10. Check external AM operation with –1 V AM input: Check that the DMM
voltage reading is between –0.125 V and 0.125 V (0% modulation).
11. End procedure: Turn the function generator output off. Disconnect the
function generator and DMM.
To Next Page
