46 Chapter 2
Performance Verification Tests
2. 10 MHz High-Stability Frequency Reference Output Accuracy: Agilent E4401B, E4402B,
E4404B, E4405B, and E4407B (Option 1D5)
Procedure
The analyzer must have been allowed to sit with the power off for at
least 60 minutes before performing this procedure. This adequately
simulates a cold start.
1. Allow the analyzer to sit with the power off for at least 60 minutes
before proceeding.
2. Switch the power to the analyzer on. Record the Power On Time
below.
Power On Time___________
3. Connect the equipment as shown in Figure 2-2. The frequency
standard provides the reference for the universal counter.
Disconnect any cable to the 10 MHz REF INPUT of the analyzer.
4. Check that the analyzer is not in external reference mode. Ext Ref
will appear on the display if the analyzer is in external reference
mode. If the analyzer is in external reference mode, disconnect the
external reference.
5. Set the universal counter controls as follows:
a. Press Gate & ExtArm.
b. Press any one of the arrow keys until TIME is displayed.
c. Press Gate & ExtArm again. Using the arrow keys, set the TIME to
10s.
d. Press Enter
e. On Channel 1, press 50 Ω/1 MΩ to light the LED next to 50 Ω.
f. On Channel 1, press AC/DC to extinguish the LED next to DC.
g. On Channel 1, press x10 Attenuator to extinguish the LED next to
x10 Attenuator.
h. On Channel 1, press 100 kHz Filter to extinguish the LED next to
100 kHz Filter.
i. On Channel 1, press Trigger/Sensitivity until Auto Trig is
displayed.
j. Use the arrows keys to toggle to off.
k. Press Freq & Ratio
6. Continue with the next step 5 minutes after the Power On Time
noted in step 2.
7. Wait for the universal counter reading to make at least two readings.
Record the universal counter reading in Table 2-3 as Counter
Reading 1 with 0.001 Hz resolution.