3-40 Chapter3
Functional Testing
Scale Fidelity
Scale Fidelity
Test Limits
Test Description
A 50 MHz CW signal is applied from a synthesized sweeper to the input
of the analyzer. The source is adjusted for a response at the reference
level. The synthesized sweeper amplitude is adjusted to achieve a
nominal amplitude below the reference level. The analyzer’s amplitude
marker is compared to the actual source change to determine the scale
fidelity error. Most of the error is the source’s output attenuator
inaccuracy from the synthesized sweeper.
Required Equipment
dB from Reference Level Minimum (dB) Maximum (dB)
–4 –1.0 1.0
–16 –1.40 1.40
–28 –1.40 1.40
–40 –1.40 1.40
–52 –1.40 1.40
–64 –2.0 2.0
Instrument Critical Specifications
(for this test)
Recommended
HP/Agilent Model
Signal Sources
Synthesized Sweeper Output Level Accuracy
0 to –15 dBm: ±1.0 dB
–16 dBm to –63 dBm ±1.4 dB
≤ –64 dBm: ≥2.0 dB
8340A/B or 836XX
Series
Adapters
(2) Type-N(m), to
BNC (f)
1250-1476
Cables
Type-N,152-cm
(60-in)
11500D
BNC,122-cm (48-in) 10503A
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