Fluke Biomedical 4000M+ User Manual
Page 36
Victoreen 4000M+
Operators Manual
B-2
Set Up for Exposure (S and O)
There are two commands used to set up for an exposure. The command to instruct the 4000M+ to set up
for an exposure from a tungsten target tube is the character S. The command to instruct the 4000M+ to
set up for an exposure from a molybdenum target tube is the character O.
Table B-1. Model 4000M+ Filter Settings
No. Sent
Filter Setting
1
2
3
4
5
27-42 (21-50 for Mo/Mo)
35-60
50-85
70-120
100-155
Table B-2. Status Bit Description
Bit Meaning
0
1
2
3
4
5
Ion chamber integrator offset too high.
Channel A offset too high.
Channel B offset too high.
Ion chamber integrator failure.
Channel A amplifier failure.
Channel B amplifier failure.
When the 4000M+ receives either of these characters, it makes preparations for an exposure. The
4000M+ will not verify proper filter wheel setting (this is up to the PC), nor will it ask for a technique. It will
simply make offset measurements and then proceed with the exposure. The 4000M+ will take slightly
more than one second to make these preparations and then respond by sending an integer value (0
through 63) to the PC (followed by
indicates successful preparation for exposure. A non-zero value can be broken down into individual bits
and interpreted as listed in Table B-2.
For example, if the 4000M+ returned the value 9 (001001 binary), it would be interpreted as: Ion chamber
integrator offset too high and Ion chamber integrator failure
.
Following is a sample program:
5
REM SET UP FOR EXPOSURE AND CHECK FOR ERROR.
1.
PINT #1, “S”;
20
INPUT #1, ER
30
IF ER=0 THEN PRINT “MAKE EXPOSURE.”
40
IF (ER AND 1) <> 0 THEN PRINT “ION CHAMBER OFFSET HIGH”
50
IF (ER AND 2) <> 0 THEN PRINT “CHANNEL A OFFSET HIGH”
60
IF (ER AND 4) <> 0 THEN PRINT “CHANNEL B OFFSET HIGH”
70
IF (ER AND 8) <> 0 THEN PRINT “ION CHAMBER FAILURE”
80
IF (ER AND 16) <> 0 THEN PRINT “CHANNEL A FAILURE”
90
IF (ER AND 32) <> 0 THEN PRINT “CHANNEL B FAILURE”
The procedure is identical for molybdenum anode mammography machines except that an O is sent
instead of an S.
It is the responsibility of the computer program to be sure that the 4000M+ filter wheel is set on the lowest
range.