18 Chapter 2
Test Descriptions
10 MHz Out Frequency Reference Adjustment
10 MHz Out Frequency Reference Adjustment
Test Description
The adjustment applies to NFAs with both the standard 10 MHz
frequency reference and 10 MHz precision frequency reference (Option
1D5).
The adjustment is performed by calculating the actual frequency error in
Hertz from Counter Reading 1 given in the 10 MHz Reference Accuracy
Test (see page 12). The negative or positive error is used to define what
the new DAC setting should be. After the DAC settings are adjusted and
saved, the 10 MHz Reference Accuracy Test is re-run to verify the unit
meets it’s published specification.
Required Test Equipment
The frequency standard provides the reference for the Universal
Counter. You can use a company-specific standard in place of the 5071A,
provided it meets the critical specifications listed in Table 2-3.
Table 2-3 10 MHz Out Frequency Reference Adjustment Test Equipment
Equipment description Critical specification for equipment
substitution
Recommended model
Universal Counter Time Interval Range: 25ms to 100ms
Single Operation Range: +2.5 to -2.5Vdc
53132A
Frequency Standard Frequency: 10 MHz Timebase Accuracy
(Aging): < 1 x 10
-10
/day
5071A
BNC Lead (X 2) Length 122cm (48 in.), Frequency
10 MHz
10503A
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