User`s manual

34 Chapter 1
O:\Manuals\E6380A_Progguid\Book\Usehpib.fm
Using HP-IB
Getting Started
• Guideline #2.
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 available 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 power. TX power is not measurable with the
Input Port set to ANT. The TX power measurement 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 measurement
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 measured
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.