Chapter 4 Making Measurements 117
those two operations), send:
OUTPUT 722;"MATH CONT" !RE-ENABLES ONE REAL-TIME MATH OPERATION
or
OUTPUT 722;"MMATH CONT" !RE-ENABLES ONE POST-PROCESS MATH OPERATION
To re-enable two previously enabled math operations send:
OUTPUT 722;"MATH CONT,CONT" !RE-ENABLES TWO REAL-TIME MATH OPERATIONS
or
OUTPUT 722;"MMATH CONT,CONT" !RE-ENABLES TWO POST-PROCESS MATH
OPERATIONS
Math Registers Table 23 shows the registers used by the real-time or post-process math
operations.
You can write a value to any math register (except SDEV) using the SMATH
command. For example, to place the value of 22 in the DEGREE register,
send:
OUTPUT 722;"SMATH DEGREE,22"
You can read the value in any math register using the RMATH command.
For example, the following program reads and prints the value in the RES
register.
10 OUTPUT 722;"RMATH RES"
20 ENTER 722;A
30 PRINT A
40 END
NULL The NULL operation subtracts a value from each reading (following the first
reading). The equation is:
Table 23: Math Registers
Register Name Register Contents
DEGREE Time constant for FILTER and RMS
LOWER Smallest reading in STATS
MAX Upper limit for PFAIL operation
MEAN Average of readings in STATS
MIN Lower limit for PFAIL
NSAMP Number of samples in STATS
OFFSET Subtrahend in NULL and SCALE
operations
PERC Percent value for PERC operation
REF Reference value for DB operation
RES Reference impedance for DBM operation
SCALE Divisor in the SCALE operation
SDEV Standard deviation in STATS
UPPER Largest reading in STATS
PFAILNUM The number of readings that passed
PFAIL before a failure was encountered
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