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Miscellaneous Information
he program gives full step by step instructions along with connection diagrams. For clarity,
some of the required adapters may not be depicted in the connection diagrams. Generally, solid
connection lines between devices indicate a cable connection, where as a dotted line indicates
a direct connection (adapters may be required). All required equipment should be connected
and switched ON before proceeding with any test, since the program will occasionally need to
write to a device before it is shown in the connection diagram. If the device is not connected,
the program will time-out before the connection diagram is drawn. he time-out limit is set to
30 seconds for all devices. If the program should stop for any reason, the computer may be
reset and the program run again with little or no loss of data (if a
Individual Test Notes and Descriptions
he following sections explain how each test is performed, in case it is necessary to perform
them manually without a computer. Before running or manually performing the performance
tests, turn on the analyzer and allow it to warm up for one hour.
Note
For the HP 8730A, it is necessary to precede each test with a service preset.
his is done by pressing
Next Menu
Frequency Accuracy
his test measures the frequency accuracy of the analyzer at several CW frequencies while
in trigger-hold mode. he device used to measure the frequency can either be a frequency
counter or a spectrum analyzer with a high degree of frequency accuracy.
Accuracy is measured to .005 percent or 5 kHz at 1000 MHz. he HP 8730A and Option 1EC
analyzers (75
) will require a minimum loss pad in order to connect to a 50
frequency counter
or spectrum analyzer.
If This Test Fails
Failures of this test are rare. If this test should fail by a small amount, readjust the reference
crystal oscillator by performing the frequency accuracy adjustment. If it fails by a signi cant
amount, and the A3 fractional-N/reference assembly's 10 MHz reference output is accurate,
suspect excessive noise on the RF output of the source. See the section titled \ roubleshooting
the A4 Source Assembly" in the \ roubleshooting and Block Diagrams" chapter.
Gain Compression
Gain compression is measured over the frequency range by inserting a calibrated 20 dB
xed attenuator and measuring the change with the analyzer. A 3 dB xed attenuator and
through-line cable is rst connected to the ports and the power level set to 3 dBm for the
HP 8713C/14C or +13 dBm (or max power) for the HP 8711C/12C/30A. he 3 dB attenuator
is used to improve any mismatch errors. he resulting power is read by the analyzer. he
calibrated 20 dB xed attenuator is then inserted into the path and the resulting power is
measured again. he di erence is then compared to the known insertion loss of the calibrated
20 dB xed attenuator.
SYSTEM OPTIONS
,
,
Next Menu
Inst tate Utilities
CRATCH C
,
,
ervice
ervice Utilities
5
,
Preset to 8711C
Performance T ests
not
is
performed).
,
.
1-21
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