Keysight NFA Series Performance Verification And Calibration Manual page 40

Step 1. Note Counter Reading 1 for the 10 MHz Reference Accuracy Test and
Step 2. With the actual error calculated, determine which DAC setting to adjust
Table 2-4
Example 2-1
NOTE
Step 3. Access the
Test Descriptions
10 MHz Out Frequency Reference Adjustment
calculate the actual error in Hertz.
Actual Error = 10 MHz - Counter Reading 1
from the table below.
DAC setting adjustments
Control Setting Standard Step Size (Hz)
≈ 7 Hz
Coarse
≈ 1 Hz
Fine
Standard NFA Actual Error
If a standard NFA Actual Error = 10,000,000 Hz - 10,000,012 Hz
the error is -12 Hz
From Table 2-4, the DAC setting must be decremented by 1 coarse
setting and 5 fine settings giving an approximate -12 Hz adjustment.
Therefore, if the original settings were, for example, Coarse = 127 and
Fine = 136, then the new settings after adjustment are Coarse = 126,
Fine = 131.
A negative error value decrements
[ ]
⇑
increments .
menus
Service
Then press the
More
password -2010, press
]
⇓
[
Decrement the NFAs DAC settings by pressing
five times.
You can type in the new value on the numeric keypad and then press
Enter.
20
]
⇓
[
, while a positive error value
sub-menu and press the
Time Base
, and menu keys. Enter the service
More Service
, then press
Enter
OR
Option 1D5 Step Size (Hz)
≈ 0.1 Hz
≈ 0.0015 Hz
and
Service Time Base
once and
Coarse
key.
System
.
Fine
Chapter 2