HP 8924E, Сборка

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Chapter 14, Diagnostics Descriptions
Description of the Digital Assembly Diagnostics (CDMADIAG)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
8924C Settings for CDMA Diagnostics
On the CONFIGURE screen the
RF Display
is set to
Freq,
for all assemblies.
The
RF Offset
is turned
Off
, for the LO/IF/Demod assembly, and for all
others its turned
On
, AT
0
MHz.
On the CDMA GENERATOR CONTROL screen
Sector A Power, Sector
B
and
AWGN
are all set to
-60
dBm/Bw. During the measurement of I and Q
Noise on the CDMA Reference assembly (CREF_I_NOISE_S and
CREF_Q_NOISE_S),
Sector A Power
and
Sector B Power
are turned
Off.
For all measurements on the LO/IF Demod assembly only, the RF ANALYZER
and RF GENERTOR screens are used. On the RF ANALYZER screen the
Tune
Mode
is set to
800
MHz, the
Input Port
is set to
RF In
, the
IF Filter
is
set to
230 kHz
and the
Input Atten
is set to
Hold
and
0 dB.
On the RF
GENERATOR screen the RF GEN FREQ is set to
800
MHz, the Output Port is
set to
RF Out
, the
Amplitude
is set to
-10
dBm and the
AF GEN 1 To
is
turned
Off.
For all measurements on the IQ Modulator assembly, four latches are set
according to directions in the Internal Maintenance Specification so diagnostic
limits can match those as determined by the R&D designer. The settings are on
the SERVICE screen and are as follows:
Select
Latch
cdmaRef_noise_mode_cntl and set
Value
to
1.
Select
Latch
cdmaRef_noise_src_cnon and set
Value
to
1.
Select
Latch
cdmaRef_I_Noise_Gain_DACand set
Value
to
3DE
Select
Latch
cdmaRef_Q_Noise_Gain__DACand set
Value
to
3DE.