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Operation
Model 8902A
NOTE
The following tables are intended as a rtj2riwce for advanced itsm who arc
familiar with the HP 8902A meastrrement capabilities.
Table 3-1 3, "Measurement Modes and Codes" All of the functions listed o n this table are defined
as "measurement modes" in the instrument. The instrument can only be in o n e Measurement Mode
at a time. If a measurement mode is volatile, pushing the CLEAR key o r 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 HP 8902A Measuring Receiver and their
programming codes. This table also lists whether or not the measurement mode is volatile,
whether the receiver section
of
the HP 8902A 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 Measuring
Receiver 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,
0
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, "Enabling/Disabling 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, Limit/Ratio 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 3-1 7, "HP 890lA/02A Code Differences" This table lists the function code differences for
identical fiinctions of the
HP
8902A and the HP 8901A, and should be usefitl in modifying existing
HP 8901A control programs to drive an HP 8902A.
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 fiindamental units (for example,
H z ,
watts, radians, dB, Yo, 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
000E+O1.
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
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