Operator`s manual

45 Signametrics
File Description
SM2044.exe
Visual B
asic DMM control panel executable
lls in your C:\WINDOWS\SYSTEM directory.
rtual Device Driver. Installs by ‘setup’ in your
C:\WINDOWS\SYSTEM\VMM32 directory.
y ‘setup’ in your
ctory.
S Word
M40CAL.DAT file:
.DAT contains calibration information for each DMM, and determines the overall analog
MM. You must not alter this file unless you are performing an external calibration of the
This file may contain multiple records for more than one DMM. Each record starts with a header line,
a
30V ranges. 1
st
entry is Offset the 2
nd
is gain parameters
ac
nd
is gain, 3
rd
freq. comp
76.0 1.0
c ; IAC 3.3mA to 2.5A ranges, offset and gain
.6 1.02402
0.0 1.03357
1.69 1.00513
0.0 1.0142
2w-ohm ; Ohms 33, 330, 3.3k,...,330Meg ranges, offset and gain
12700.0 1.002259 ;in the SM2040, the 1
st
and last lines are placeholders
1256.0 1.002307
110.0 1.002665
0.0 1.006304
0.0 1.003066
0.0 1.001848
0.0 0.995664
0.0 1.00030
…
The first line identifies the DMM and the calibration date. The "card-id" is stored in ROM on each DMM. During
initialization the driver uses the information from the DMM.CFG file to identify where the DMM is located in I/O
space, reads the "card-id" and "calibration_date", and then reads the corresponding calibration information from the
SM40CAL.DAT file.
Msvcrt.dll System file. Insta
Windrvr.vxd
Win98/95/Me Vi
Windrvr.sys
Win NT Virtual Device Driver. Installs b
C:\WINNT\SYSTEM32\DRIVERS dire
Install.doc
Installation instructions in M
Important Note about the S
L
The file SM40CA
performance for that D
DMM.
followed by calibration d ta.
card_id 10123 type 2044 calibration_date 06/15/1999
a ; A/D compensati n
d o
72.0 20.0
vdc ; VDC 330mV, 3.3V, 33V, 3
-386.0 0.99961
-37.0 .999991
-83.0 0.999795
-8.8 1.00015
v ; VAC 1st line - DC offset. Subsequent lines: 1
st
entry is Offset the 2
5 ; starting with the 330mV range, and last line is for the 250V range.
.303
0.84 1.015461 23
0.0043 1.0256 23
0.0 1.02205 0
0.0 1.031386 0
idc ; IDC 3.3mA to 2.5A ranges. 1
st
entry is offset, 2
nd
is gain parameter
-1450.0 1.00103
-176.0 1.00602
-1450.0 1.00482
-1
ia
1