HP 8340B Manual page 63

4-13. PULSE MODULATION ACCURACY TEST (Cont'd)
6. Press the [PULSE] key on the DUT (pulse ON). Adjust the oscilloscope vertical position and
sensitivity to place the modulation envelope on convenient horizontal graticule lines. Press the
[PULSE]key to turn pulse OFF. Press the [POWERLEVEL] key on the DUT. Note the power level
DISPLAY.
in the ENTRY
7. Adjust the DUT's power level using the rotary knob so that the IF carrier signal aligns with the
horizontal graticule lines established in step 6 for the modulation envelope. Note the ENTRY
DISPLAY power level.
8. The difference between the power levels noted in step 6 and 7 should be less than the specifica-
tion for this pulse width and RF frequency.
9. Repeat steps S through 8 for pulse widths of 200, SOO, and 1000 nanoseconds.
10. To test the Pulse Repetition Frequency range (100 Hz to 5 MHz), set the pulse generator period to
10 milliseconds (100 Hz) and pulse width to 1 microsecond (duty cycle of 0.01%). Repeat steps S
through 8. Set the pulse generator period to 200 nanoseconds (5 MHz) and pulse width to 100
nanoseconds (minimum specified PW). Repeat steps 5 through 8.
11. Set the pulse generator period to 10 microseconds and pulse width to 100 nanoseconds. Repeat
steps 5 through 10 at CW frequencies of 3, 9, 15, and, if the DUT is an HP 8340B, 22 GHz. Set the
LOs CW frequency to be 50 MHz below the DUT's frequency. For DUT frequencies of iS and 22
GHz, press [PEAK] to ON.
4-66 Performance Tests HP 8340B/41B