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5-6
Carrier frequency accuracy
This check provides a conventional method of checking the signal generator frequency locking
circuitry. It will confirm correct operation of phase locked loops and dividers. Overall accuracy is
determined by the instrument’s internal reference standard.
Specification
Range 9 kHz to 2.4 GHz.
Resolution 1 Hz.
Accuracy Equal to the frequency standard accuracy.
Test equipment
Description Minimum specification Example
Frequency
counter
9 kHz to 2.4 GHz Agilent 53181A
with option 030
Test procedure
UUT
C5356
RF
OUT
INPUT
Counter
Fig. 5-3 Carrier frequency accuracy test set-up
(1) Connect the test equipment as shown in Fig. 5-3.
(2) Connect the internal frequency standard from the UUT to the external standard input on the
counter.
(3) On the UUT set:
Carr Freq 9 kHz
RF Level 0 dBm
(4) Record the frequency measured by the counter against each of the carrier frequencies shown
in Table 5-14. (Since the two instruments’ frequencies are locked together, the limit is
±1 digit on the counter display.)
(5) At 1200 MHz disconnect the UUT internal frequency standard from the counter and instead
apply the external reference. Check the result against the limits.
The test limits quoted are for guidance and assume that the internal frequency standard has
recently been adjusted. Aging and stability have to be considered when establishing the real
test limits (see 'Performance data' in Chapter 1).