253
Chapter 5, Advanced Operations
Increasing Measurement Throughput
Time-to-first-reading after making new settings is usually much slower than the
repetitive reading rate once the first reading has been returned. The main
contributor to first-reading measurement time is hardware autoranging. Hardware
autoranging time can be eliminated by first establishing the expected AF and RF
signal levels into the Test Set. With these signal levels present, the Test Set will
autorange, allowing the operator to determine the attenuation and gain settings of
the RF input attenuator as displayed in the RF ANALYZER screen, and to
determine the various IF and audio gains as displayed in the AF ANALYZER
screen. The attenuation and gain settings determined in manual mode should be
recorded for use in writing the program.
In the control program, select Gain Control, Hold (default is Auto), and make the
settings recorded in manual mode. When the control program runs, the signal
levels into the Test Set need to remain relatively constant since autoranging has
been disabled.
If the automatic functions are turned off, the control program must set the gain
stages and frequency tuning before triggering a measurement. The automatic
functions can be turned off as follows:
Disable RF autotuning by setting the
Tune Mode
field to
Manual
using the
following command:
:RFAN:TMOD ’MANUAL’
Disable RF autoranging by setting the
Input Atten
field to
Hold
using the
following command:
:RFAN:ATT:MODE ’HOLD’
Disable AF autoranging by setting the
Gain Cntl
field to
Hold
using the
following command:
:AFAN:RANG ’HOLD’
Содержание 8920B
Страница 10: ...10 ...
Страница 16: ...Contents 16 9 Error Messages Index 673 ...
Страница 17: ...17 1 Using HP IB ...
Страница 48: ...48 Chapter 1 Using HP IB Remote Local Modes ...
Страница 49: ...49 2 Methods For Reading Measurement Results ...
Страница 61: ...61 3 HP IB Command Guidelines ...
Страница 84: ...84 Chapter 3 HP IB Command Guidelines Guidelines for Operation ...
Страница 85: ...85 4 HP IB Commands ...
Страница 90: ...90 Adjacent Channel Power ACP ...
Страница 116: ...116 Configure I O Configure ...
Страница 156: ...156 Call Processing ...
Страница 162: ...162 Display DISPlay space TDMA test TESTs TFReq THLP TIBasic TMAKe TPARm TPRint TSEQn TSPec Returns current screen TX ...
Страница 185: ...185 System System SYSTem ERRor Returns integer value quoted string ...
Страница 242: ...242 Common Command Descriptions ...
Страница 251: ...251 5 Advanced Operations ...
Страница 377: ...377 7 IBASIC Controller ...
Страница 458: ...458 Chapter 7 IBASIC Controller The TESTS Subsystem ...
Страница 640: ...640 Chapter 8 Programming The Call Processing Subsystem Example Programs 11280 SUBEND 11290 ...
Страница 643: ...643 9 Error Messages ...
Страница 672: ...672 ...
Страница 682: ...Index 682 ...