ACCEPTANCE TESTING
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(2) Connect the internal frequency standard from the UUT to the external standard input on the
counter.
(3) On the UUT set source A to:
[Carrier Freq] 10 [kHz]
[RF Level] 0 [dB]
(4) Record the frequency measured by the counter against each of the carrier frequencies
shown in Table 7-17. (Since the two instruments’ frequencies are locked together, the limit
is ±1 di
git 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.
Notes
If the instrument is fitted with Option 3, (high stability frequency standard), use the second
1200 MHz test 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
specifications in Chapter 1.)
It will be necessary to disconnect the 50 Ω load and reconnect the UUT RF OUTPUT to the B input
and C input where necessary.
(6) Repeat (2) to (5) for source B and, if Option 1 is fitted, source C.
Spectral purity
Individual sources
Specification
Harmonics:
Typically better than −30 dBc for RF levels up to +6 dBm.
Typically better than −25 dBc for RF levels up to +18 dBm (+14 dBm
above 1.2 GHz).
Non harmonics:
(for offsets >3 kHz)
Better than −70 dBc for carrier frequencies up to 1 GHz.
Better than −64 dBc for carrier frequencies above 1 GHz.
Better than −60 dBc for carrier frequencies above 2 GHz.
Residual FM:
Less than 4.5 Hz RMS in a 300 Hz to 3.4 kHz bandwidth at a carrier
frequency of 1 GHz.
SSB phase noise:
Better than −124 dBc/Hz at 20 kHz offset from a 470 MHz carrier.
Typically less than −121 dBc/Hz at 20 kHz offset from a 1 GHz carrier.
Carrier leakage:
Less than 0.5 μV at the carrier frequency into a two-turn 25 mm loop
25 mm away from the surface of the signal generator.
Test equipment
Description Minimum specification Example
Spectrum
analyzer
DC to 7.2 GHz frequency coverage Anritsu MS2602A
or IFR 2386
Measuring
receiver
0 dBm to −127 dBm; 2.5 MHz to 2.4 GHz. Capable
of measuring residual FM <2 Hz and SSB phase
noise <−124 dBc/Hz at 20 kHz offset from a 1 GHz
carrier
Agilent 8902A
with Option 037
Signal generator +8 dBm from 32.5 MHz to 2.43 GHz IFR 2041
50 Ω load 1 W, 50 Ω nominal impedance, DC to 2.4 GHz
Lucas Weinschel
M1404N
2-turn loop 25 mm diameter
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General