Specifications

3-9 NOISE FIGURE
MEASUREMENT
CAPABILITY
(OPTION 4)
This procedure is intended to verify the functionality of the noise figure
measurement hardware and the validity of the internal extension table
file stored on hard disk (SRAM disk). Perform this procedure only if the
instrument has Option 4X installed.
This Performance Test procedure consists of three steps. They are:
q
Noise Figure Assurance Check
q
Raw Receiver Noise Figure Check
q
Noise Figure Measurement Confidence Check
Noise Figure
Assurance Check
This test assesses the instrumentation uncertainty for wideband noise
figure measurement.
Procedure: Allow the instrument to warm up at least 60 minutes.
1. Press the Appl key.
2. Select:
CHANGE APPLICATION SETUP
MEASUREMENT TYPE/NOISE FIGURE
3. Press the Utility key
4. Select:
DIAGNOSTICS
NOISE FIGURE ASSURANCE
5. Connect a throughline between Port 1 and Port 2.
6. Select the PERFORM ASSURANCE soft key to start the test.
7. Observe the test results and compare NB to SB. The differences
should be less than 0.15 dB (see below).
8. If the test fails, proceed to Chapter 6—Troubleshooting.
Raw Receiver Noise
Figure Check
This test can detect hardware faults such as switch failures, loose connec
-
tor on internal routing, oscillating preamp under certain load conditions,
and similar problems. This test also validates the internal extension table
file that is stored on the battery backed RAM.
Equipment
Required:
The following test equipment is required:
q
Anritsu NC346B 15 dB ENR Noise Source or Equivalent
q
Anritsu 3670 Series Throughlines and Various Adapters
q
BNC Male to Male Cable (1m, 3.3 ft. length)
Preliminary
Setup:
Allow the instrument to warm up at least 60 minutes.
NOISE FIGURE MEASUREMENT CAPABILITY (OPTION 4) PERFORMANCE TESTS
3-26 MS462XX MM