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32
Chapter 1, Using HP-IB
Getting Started
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Guideline #3. Avoid program hangs.
If the program stops or “hangs up” when trying to ENTER a measured value, it is most
likely that the desired measurement field is not available. There are several reasons
that can happen:
1. The screen where the measurement field is located has not been DISPlayed before
querying the measurement field.
2. The measurement is not turned ON.
3. The squelch control is set too high. If a measurement is turned ON but is not avail-
able due to the Squelch setting, the measurement field contains four dashes
(- - - -). This is a valid state. The Test Set is waiting for a signal of sufficient strength
to unsquelch the receiver before making a measurement. If a measurement field
which is squelched is queried the Test Set will wait indefinitely for the receiver to
unsquelch and return a measured value.
4. The RF Analyzer’s Input Port is set to ANT (antenna) while trying to read TX pow-
er. TX power is not measurable with the Input Port set to ANT. The TX power mea-
surement field will display four dashes (- - - -) indicating the measurement is
unavailable.
5. The input signal to the Test Set is very unstable causing the Test Set to continuously
autorange. This condition will be apparent if an attempt is made to make the mea-
surement manually.
6. Trigger mode has been set to single trigger (TRIG:MODE:RETRig SINGle) and a
new measurement cycle has not been triggered before attempting to read the mea-
sured value.
7. The program is attempting to make an FM deviation or AM depth measurement
while in the RX TEST screen. FM or AM measurements are not available in the RX
TEST screen. FM or AM measurements are made from the AF Analyzer screen by
setting the
AF Anl In
field to FM or AM Demod.
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 ...