248 Chapter 5
Post-Repair Procedures
Internal 10 MHz Frequency Reference Adjustment
Internal 10 MHz Frequency Reference
Adjustment
Adjustment Description
The Internal Frequency Reference adjustment measures an input
signal from a standard and adjusts the internal timebase. The source is
provided by a frequency standard with an output of 10 MHz. At the RF
input to the UUT, the source amplitude must be 0 dBm or less. The
internal frequency reference is adjusted to 10 MHz with minimum
deviation.
NOTE This adjustment requires a minimum of a 24 hour warmup time. The
UUT must be turned on —not in standby— for the entire warmup
period.
Required Equipment
The following table lists the test equipment required for the
adjustment. The list includes any miscellaneous devices, cables, and
adaptors. Refer to Table 1-2, “Required Test Equipment Summary,” on
page 18, for the critical specifications of the test equipment.
Table 5-2 Required Test Equipment
Instrument Recommended
Agilent Model
Number
Alternative
Agilent Model
Number
Standards
Frequency Standard 5071A
Cables
BNC 10503A
Adaptors
Type-N (m) to BNC (f) 1250-1476
Attenuator
20 dB Fixed Attenuator.
The attenuation value
must provide a power
level of less then 0 dBm
at the UUT RF input.
8491A Option
To Next Page
Loading...
Need help?
General
