Keysight NFA Series Performance Verification And Calibration Manual page 35

8. On Channel 1, press
9. Use the arrow keys (
10. Press
Freq
Step 5. When the Universal Counter reading has stabilized, record the reading
in the Worksheet as Counter Reading 1 with 0.1 Hz resolution.
This reading is taken as the actual frequency reference of the NFA.
Ensure that the measured value is within the published specifications of
±5 Hz for the standard, or ±0.1 Hz for Option 1D5.
Step 6. Increase the NFA's fine DAC control by 1 step from its initial value.
Press the
the service password -2010, press
and menu items. Press the Up Arrow key to increment the
Fine
control menu item by 1. The value displayed in the
now 1 more than the initial value.
Step 7. When the frequency counter reading has stabilized, record reading in the
Worksheet as Counter Reading 2 with 0.1 Hz resolution.
Step 8. Decrease the NFA's fine DAC control by 1 step to return to its initial
value detailed in step 6, then again decrease the NFA's fine DAC control
by 1 step.
Step 9. When the frequency counter reading has stabilized, record the reading in
the Worksheet as Counter Reading 3 with 0.1 Hz resolution.
Step 10. Press
Preset
values.
Step 11. Subtract Counter Reading 1 from Counter Reading 2 and record the
difference in the Worksheet as the Positive Frequency Change.
Positive Frequency Change = Counter Reading 2 - Counter Reading 1
Step 12. Subtract Counter Reading 1 from Counter Reading 3 and record the
difference in the Worksheet as the Negative Frequency Change.
Negative Frequency Change = Counter Reading 1 - Counter Reading 3
Chapter 2
10 MHz Out Frequency Reference Accuracy
Trigger/Sensitivity
) to toggle to Off.
—>
and .
Ratio
key, then the
System
on the NFA to return the DAC settings to their initial
until Auto Trig is displayed.
, and
More More Service
, then press Service,
Enter
Test Descriptions
menu keys. Enter
,
Time Base
Fine
menu item is
Fine
15