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152 Digitizers Verification Tests Appendix D
Test Conditions All test procedures should comply with the following test conditions:
• Ambient temperature of the test area is between 18°C and 28°C
and stable to within ±1°C.
• Ambient relative humidity of the test area is <80%.
• Must have a one hour warm-up with all input signals removed
before verification or adjustment.
• Use only copper connections to minimize thermal offset voltages.
• Use shielded twisted Teflon
â
insulated cable or other high
impedance, low dielectric absorption cable for all measurements
to reduce high resistance errors.
• Keep cables as short as possible. Long test leads can act as an
antenna causing the pick-up of ac signals and contributing to
measurement error.
• Allow 5 minutes after handling input connections for thermal offset
voltage settling.
Recording Your
Test Results
Make copies of the Performance Test Record (at the end of this appendix)
for use in performance verifying each channel (use one test record copy per
channel). The test record provides space to enter the results of each
Performance Verification test and to compare the results with the upper
and lower limits for the test.
The value in the "Measurement Uncertainty" column of the test record is
derived from the specifications of the source used for the test and represents
the expected accuracy of the source. The value in the "Test Accuracy Ratio
(TAR)" column of the test record is the ratio of digitizer accuracy to
measurement uncertainty.
Performance
Verification Test
Programs
Performance Verification Test programs are provided so you can
performance verify your digitizer. These programs were developed on a PC
running Windows with a GPIB interface and SICL/Windows for GPIB
software. All projects written in C programming language require the
following settings, files or paths to work properly:
Project Type: QuickWin application (.EXE)
Project Files: 1. <source code file name>.C (which includes the VISA.h header file)
2. One of the following files from the Agilent I/O Libraries for Instrument Control:
[drive:]\VXIPNP\WIN\LIB\MSC\VISA.LIB (Microsoft® compiler)
[drive:]\VXIPNP\WIN\LIB\BC\VISA.LIB (Borland® compiler)
Memory Model: Options | Project | Compiler | Memory Model Þ large
Directory Paths: Options | Directories
Include File Paths: [drive:]\VXIPNP\WIN\INCLUDE
Library File Paths: [drive:]\VXIPNP\WIN\LIB\MSC (Microsoft®)
[drive:]\VXIPNP\WIN\LIB\BC (Borland®)