34
Chapter 1, Using HP-IB
Getting Started
•
Guideline #6. Numeric values are returned in HP-IB Units or Attribute Units only.
When querying measurements or settings through HP-IB, the Test Set always returns
numeric values in HP-IB Units or Attribute Units, regardless of the current Display
Units setting. HP-IB Units, Attribute Units and Display Units determine the units-of-
measure used for a measurement or setting, for example, Hz, Volts, Watts, Amperes,
Ohms. Refer to
"Specifying Units-of-Measure for Settings and Measurement
for further information.
For example, if the Test Set’s front panel is displaying TX Frequency as 835.02 MHz,
and the field is queried through HP-IB, the value returned will be 835020000 since the
HP-IB Units for frequency are Hz. Note that changing Display Units will not change
HP-IB Units or Attribute Units. Note also that setting the value of a numeric field
through HP-IB can be done using a variety of units-of-measure. The HP-IB Units or
Attribute Units for a queried value can always be determined using the :UNITs? com-
mand or :AUNits? command respectively (refer to
"Multiple Number Measurement Syntax" on page 195
, for com-
mand syntax).
Control Annunciators
The letters and symbols at the top right corner of the display indicate these
conditions:
•
R
indicates the Test Set is in remote mode. The Test Set can be put into the remote mode
by an external controller or by an IBASIC program running on the built-in IBASIC con-
troller.
•
L
indicates that the Test Set has been addressed to Listen.
•
T
indicates that the Test Set has been addressed to Talk.
•
S
indicates that the Test Set has sent the Require Service message by setting the Service
Request (SRQ) bus line true. (See
"Status Reporting" on page 260
•
C
indicates that the Test Set is currently the Active Controller on the bus.
•
*
indicates that an IBASIC program is running.
•
?
indicates that an IBASIC program is waiting for a user response.
•
-
indicates that an IBASIC program is paused.
Summary of Contents for 8920B
Page 10: ...10 ...
Page 16: ...Contents 16 9 Error Messages Index 673 ...
Page 17: ...17 1 Using HP IB ...
Page 48: ...48 Chapter 1 Using HP IB Remote Local Modes ...
Page 49: ...49 2 Methods For Reading Measurement Results ...
Page 61: ...61 3 HP IB Command Guidelines ...
Page 84: ...84 Chapter 3 HP IB Command Guidelines Guidelines for Operation ...
Page 85: ...85 4 HP IB Commands ...
Page 90: ...90 Adjacent Channel Power ACP ...
Page 116: ...116 Configure I O Configure ...
Page 156: ...156 Call Processing ...
Page 185: ...185 System System SYSTem ERRor Returns integer value quoted string ...
Page 242: ...242 Common Command Descriptions ...
Page 251: ...251 5 Advanced Operations ...
Page 377: ...377 7 IBASIC Controller ...
Page 458: ...458 Chapter 7 IBASIC Controller The TESTS Subsystem ...
Page 640: ...640 Chapter 8 Programming The Call Processing Subsystem Example Programs 11280 SUBEND 11290 ...
Page 643: ...643 9 Error Messages ...
Page 672: ...672 ...
Page 682: ...Index 682 ...