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DEFINING A DATA LOGGING PROBLEM
In a data logging application the HP-71B Handheld Computer, with an HP 82401 A HP-IL Interface
installed, performs a series of measurements without operator intervention. The HP-71 sends commands
to an HP 3421A Data Acquisition/Control Unit and records the resulting data. The LI! program
controls the actual data logging session, following the specifications contained in a setup file. You can use
the following programs for data logging applications:
eo SETIIF - This program is used to interactively create setup files which drive the LIprogram.
A setup file specifies one or more channel groups. Each group contains a channel list, the
function to be measured, limit tests, and so on. One group might direct LI15 to read temperature
from three channels, while another group might direct L153 to measure a frequency.
The
=ETLIF program is described in section 9.
o L.[15 - This program is driven by an input file (the setup file), and records data in output files as
specified at run time. The data files correspond to the HPAF file format (appendix H). The |. Li;
program is described in section 10.
eo FEFORT - The report program reads the data files created by the L.IJ5 program and generates
printed reports or charts. This program is described in section 11.
oe TRHMSFER - The transfer program sends data from files created by the L.I15 program to the
HP 44456 System Software package on an HP Series 200 computer. This program is described in
section 12.
oe MEOOSFE - The MS-DOS transfer program sends data from files created by the L.IJI5 program
to the MS-DOS environment. This program is described in section 13.
8.1 DATA LOGGING PROCEDURE
The process of data logging involves the following steps:
1) Use the "ETLUF program to create a setup file which describes the channels to be scanned,
functions to be measured, limit tests, and limit actions.
2) Run the LLG program. LLG reads the setup file, prompts for the name of the file in which to
store the data, and collects the data.
3) Analyze the data. You can use the FEFIIFET program to generate a written report on the data
from the HP-71, or you can transfer the data to another computer.
Use the TEHMHZFER
program if you want to move the data to the HP 44456 System Software package on an HP Series
200 computer. Use the M=00% FE program if you want to move the data to an MS-DOS based
computer.
8-1
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