3. Comb Generator Frequency Accuracy, HP 8593EM and HP 8596EM

Procedure

1. Connect the equipment as shown in Figure 2-3.

Option 026 only: Omit the Type N to APC 3.5 mm adapter.

2.Press instrument preset on the synthesized sweeper, then set the controls as follows:

CW : :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: 100.025 MHz

POWER LEVEL :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: :: :: :: 0 dBm

RF : :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: :: :: ::: :: :: :: ::: :: :: :: :: ::: :: : OFF

3.Press 4PRESET5 on the EMC analyzer, then wait for preset routine to ￿nish. Set the EMC analyzer by pressing the following keys:

4FREQUENCY5 100 4MHz5

4AUX/USER5 COMB GEN ON OFF (ON)

4SPAN5 10 4MHz5

4AMPLITUDE5 REF LVL 117 4dB￿V5

4BW5 IF BW AUTO MAN (MAN) 10 4kHz5

4MKR !5 MKR ! HIGH

4MKR5 More 1 of 3 MK TRACK ON OFF (ON)

4SPAN5 100 4kHz5

4.Press 4AMPLITUDE5 and adjust the reference-level setting until the signal peak is 10 dB below the reference level.

5.Set the synthesized sweeper RF on. Adjust the synthesized sweeper power level until the two signals are the same amplitude.

6.Set SCALE LOG LIN (LOG) to 2 dB on the EMC analyzer.

7.If necessary, readjust the synthesized sweeper power level until the two signals are the same amplitude.

8.Set the synthesized sweeper CW to 100 MHz. A very unstable signal will probably appear. The peak amplitude should be at least 3 dB greater in amplitude than either of the individual signals.

9.Adjust the synthesized sweeper CW setting until a single signal appears to rise and fall in amplitude at the slowest rate (1 Hz frequency resolution will be necessary). The signal peak should be displayed approximately 6 dB above the amplitude of the individual signals.

2-10 Performance Veri￿cation Tests