3-8. Data Output; Data Output Format - HP 8901B Operation And Calibration Manual

Operation Model 8901B
NOTE
The following tables are intended
a s
a reference for advanced users who
are
familiar with the
HP 8901B
measurement capabilities.
Table 3-1 3, "Measurement Modes and Codes".
All of the functions listed on this table are defined
as "measurement modes" in the instrument. The instrument can only be in one Measurement Mode at
a time.
If
a measurement mode is volatile, pushing the CLEAR key or entering CL over the bus, will
return the instrument
to
the last selected, non-volatile measurement mode.
This table lists all the measurement modes of the H P 8901B Modulation Analyzer and their
programming codes. This table also lists whether or not the measurement mode is volatile, whether the
receiver section of the H P 8901B is used to make the measurement, and whether the Demodulation
Output is blanked during the measurement.
Table 3-1
4, "Measurement Modifiers". Whenever a measurement is selected, the Modulation
Analyzer sets up its internal circuitry so it can make the most accurate measurement possible. These
settings can be altered by the operator to modify the measurement.
This table lists the measurement modifiers for the primary measurement modes listed in Table 3-13,
"Measurement Modes and Codes".
To see what modifiers are being automatically selected,
e
use the Special Special display to read the Range in use,
0
read the front-panel lights for the Detectors, Filters and De-Emphasis in use and
0
see Table 3-15 or -16, "EnablingDisabling Variable Parameters (Front Panel or Remote)" for
a summary of how to read the Calibration Factors, the Frequency Offset, the
dB
external
Attenuation, the Limits set, and whether Ratio has been selected.
Table 3-1
5,
"Enabling/Disabling Variable Parameters (Front Panel)".
This table lists ways of
verifying from the front panel the values of the Calibration Factors, Frequency Offset,
dB
External
Attenuator, Limitwtio and Set Reference functions.
Table 3-1
6,
"Enabling/Disabling Variable Parameters (Remote)".
This table is the same
as
Table
3-15 except that it shows the programming codes required instead of the front-panel keystrokes.
Table 3-17, "HP 8901A/02A Code Differences".
This table lists the function code differences for
identical functions of the H P 8901B and the H P 8901A, and should be useful in modifying existing
HP 8901A control programs to drive an HP 8901B.
3-8. DATA OUTPUT
Data Output Format
Numeric Data.
As shown below, the output data is always in the form of an implicit-point exponential
constant. Data is always output in fundamental units (for example, Hz, watts, radians,
dB,
%, etc.),
and the decimal point (not sent) is assumed to be to the right of the tenth digit of the mantissa.
Data values never exceed +9 000 000 OOOE-tOl. Output values greater than this are Error Messages.
Output data is displayed using the following format: first the sign, then 10 digits (leading zeros not
suppressed) followed by the letter E and a signed two-digit exponent. The last two characters of the
string are a carriage return (CR) and a line feed (LF) in string positions 16 and 17. Refer to Table 3-5,
"Data Output Examples" for examples.
3-18