Ludlum Measurements 2350 User manual

DATA LOGGER
Revised: July 1993
Serial No. 106622 and Succeeding
Serial Numbers
Software Version # 37102n16
.
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LUDLUM MEASUREMENB, INC.
501 OAK ST., P.O. 60X 810
svuEmTER,Tx78558
9l-FAx:9lW3!%672
Ludlum Model 2350

f
1
71.1 uR/hr RAT
I’ ’
0
60 SEC Et
15.3 UR DOS
218 MIN DOS
18: 44 DET#O2
#OO 1
0 *o
WAND
MODEL 2350
DATA LOGGER
AUDIO 1oo
DIVIDE
1
VOLUME
SERIAL I/O
(/@zqJ)
o o ACKNLDGE @
xxxxx
I
J

Ludlum Measurements, Inc. warmnts the,products covered in this instruction manual to be thee
of defects due to workmanship, materials, and design for a period of twelve months from the date
of delivery, with the exception of photomultiplier tubes and geiger tubes, which are warranted d&ct-
ike for 90 days. This warranty is voided in instances of improper installation abuse, mishandling,
misuse, fkight damage, or repair by unqualified persons.
In the event of instrument failure, notify Ludlum Measurements, Inc. for repair or replacement.
Liability of this warranty is limited to the purchase price of the insWment.
RECEMNG CONDITION EXAMINATION
Be sure to verify that the shipping carton is received in good condition with no visible damage,
Should the instrument be received in a damaged condition, save the shipping container and the
packing material and request an immediate inspection by the carrier.
RETURNOFGOOIISToMANuFAcllJRER
If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please
send to the address below. All shipments should include documentation containing return shipping
address, customer name, telephone number, description of service requested, and all other necessary
information. Your uqXration will expedite the return of your equipment.
’
:
5olOAKS~
SWEEIWA’IE& TX 79556
91~23~5494
FAX [phone]

M2350 Data Logger
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3. DESCRIPTION OF FRONT PANEL CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. DESCRIPTION OF FUNCTIONS . . . . . . . . . . . . . . . . l . . . . . . . . . . . . . . . . . . . .
2
5. OPERATINGPROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5.1Installingbatteries.. ...........................................
5
5.2operatingtheinstrurnent ........................................
5
5.3P~orminga”coldstart” ........................................
5
6. DESCRIPTION OF DISPLAY MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1 Normal display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.2ParameWs-d&play.. ...........................................
6
6.3Detectordisplay
..............................................
7
6.4Alarmdisplay.. ...............................................
7
6.5Loggeddatadisplay ............................................
8
6.6Recycledatadisplay ...........................................
8
6‘7 Recycle setup display
........................................... 9
7. DESCRIPTION OF COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
7.1setcommands ...............................................
7.2control~~ ............................................
7.3Readcommands
.............................................
8. COMMANDUSAGE ............................................
8.1 Scanthrou~thedisplaymodes ..................................
8.2Setvariousdetectorsettings ......................................
8.3Readvariousdetectorsettings
....... j.. ..........................
11
12
14
18
19
20
21
9. APPLICATIONS
..................
.
..................
.
.........
22
9.1 General M2350 setup
.......................................... 22
9.2CountratemeterwithaNaIscintillator .............................
22
9.3Micro-RmeterwithaNaIscintillator.. .............................
24
9.4SurveymeterwithaG-Mdetector.. ...............................
26
9.5Lqgingreadhgswithmultipleprobes ..............................
27
9.6Viewloggedreadings ..........................................
31
page i

10. SPECIAL,
OPEBA’I’@G MODES _ .i:t, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1 Recyclemade
............................................... 34
10.2 Dead time calibration
.........................................
36
IO;3 CMibration constant
..........................................
38
11.
EIANDHEL,DTERMINALOPERATION ...........................
41
11.1Terminalsetup ...........
t...:Y; .:.
...........................
41
11.2TerminaIoperatibn;. ....... .; .........
.:
....................... 41
12.
OPTICALWANDOPERATION..
.....
.
.....
.
.....
;;.
....... .-.; ..
42
12.1 Optidtiuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
12.2Barcode generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
PAR’TSL,IST . . . . . . . . . . . . . . . ..A.....................~ ;......; . . .
43
,*’
43
Model235ODataLogger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
celltral~Board,~g371x1 . . . . . . . . . . . . . . . . . . . . ...*...
43
Am@PowrsupplyBoard,~~g371x2 . . . . . . . . l . . . . . . ...’ . . . . . . . . 45
Back@w~Dr&ng371 x3 . . . . . . . . . . . . . . . . . .;‘. . . . . . . , . . . . .I 48
I/Oh~~I>rawving371 x5
. . . . . .;. . . . . . . . . . . I’. . . . .‘. . . . . . 48
WkingDiagfmqIhwing371x4 . . . . . . . . . . . . . . . . . . . . . . . . . ‘;‘.......
50
. ..
,i
PageJi ,.
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M2350 Data Logger
1. GENmAJJ
The Ludlum Model 2350 Data Logger is
a self contained counting instrument designed
for operation with scintillation, proportional,
or G-M detectors. The M2350 is complete
with a voltage-sensitive amplifier, single
channel analyzer, detector high voltage power
supply, detector overload sensing circuitry,
and data logging memory all under micropro
cessor control. The settings can be changed
through the bar code reader or the RS-232
serial I/o port.
‘The M2350 provides four different types
of data readout. ‘Ihey are 1) a digital
ratemeter, 2) a five decade. log bar graph
ratemeter, 3) a timed counter, and 4) an
integrated dose counter and timer. All four
readouts operate from the same count input.
The count displays can be cone&d for
detector dead time.
The digital ratemeter and integrated dose
counter can also have a calibration constant
applied to them to allow direct readout in user
selected units (ie. R/hr, dpm cps, etc.). All
readout displays can be individually turned on
or off except for the bar graph display, which
is always displayed. The counters will
continue to function even when the counter
display is turned off.
The M2350 provides a click per event
audio output with a programmable AUDIO
DIVIDE selector switch to increase its
usefulness with sensitive detectors. There is
also a five decade analog output available on
the backplane.
The data logging memory can store the
readings fi-oin 250 samples and the setups for
sixteen different detectors. The logged reading
contains the count da& count time, date,
detector number, location code, sample
number, status, time, and type of reading. ‘Ihe
detector setup memory contains the settings
for the detector calibration constant, detector
dead time, detector high voltage, detector
model number, detector serial number, display
range multiplier, display time base, display
units, integrated dose alarm setting, overload
current, ratemeter alarm &tin& scaler alarm
setting, scaler count time, threshold, and
window.
The memory is powered by the M2350
batteries even when the M2350 is turned off.
In addition, there is a backup capacitor that
keeps the memory powered for about thirty
minutes when the batteries are removed to
allow time to replace weak batteries.
l HEH WJLTAGEz 0 to 2500 volts. l AUDIa Click per event through built
in unimorph speaker with adjustable volume
.SmsrxlWIYz With threshold at 100, and selectable divide by 1, 10, or 100.
adjustable from 1.5mV to 35mV, f&ory
calibrated to 1OmV.
*
l CAUBMTION CZCINMU: None;
’ all calibrations done through the bar code
l INPUTIMPEDANCE 1Ok input or RS-232 serial I/O.
l Dl!XlEKR cKBNEKR Zkries l BA’lJERIE Four “D” cell flashlight
II 11
C. batteries in
separate externally accessible
compartment.
l DISPUW8lineby15chamcterLCD
display with EL backlight.
l BATJJRY HFE From 50 hours to 90
hours with Duracell MN1300 batteries
paw 1

M2350 Data Logger
dependiig upon use of EL backlight. 4.4
l WEIGHR 2.3 kg (Sibs) including four
volts is considered the end point of the battery
“D” cells.
life. When the batteries reach this point’ there
is about two to four hours use left.
l FINISH Computer beige polyurethane
enamel with black silk-screened nomenclature.
. SIZE 1 lcm (4.25”) W x 22cm (8.75”)
L x 15~x11 (6”) H (21~x1 (8.25”)H with
handle).
3. DESQUETIONOFFlRONTPAN]E3L~
l DISPIAYz 8 line by 15 character
backlit liquid crystal display.
l DFLEcI[1DR: seiies “C” connector for
detector.
o 1: Provides 1 click per event
. o10: Provides 1 click per 10 events
o 100: Provides 1 click per 100
events
0 Impedance: 1ok.
o Ballast resistor: 1M
l VOUTME: One-turn potentiometer
used to adjust the vohune of the speaker.
l F0WERz Twoposition switch to turn
power to instrument on or off.
l BACKLZGHF Turns LCD backlight
on or off.
l AUDIO DIVIDE Three-position
switch used to control audio divide by:
l ACKNUKEz Pushbutton switch used
to acknowledge and silence the alarms.
l WAND: Connector for optical wand
used to read “3 of 9” code bar codes.
l SERIAL IlO: Connector for RS-232
signals to interface to computers or ternGnals.
4. DEERFIlOl’T OF FuNcIIc)INS
l cJlxmmm: l-here are four counters
available. They all use the same input but
provide different types of readouts.
0Digital Ratemeter:
Provides a
digital readout of the detector count rate.
r
‘Ibis readout is corrected for detector dead
timeandcanalsobecalibmtedfordirect
readout in the desii units and timebase.
o BarGraph-:
Provides a
five-decade log readout of the detector
count rate in counts per second Tom one
cps to 100 kcps that is corrected for
detector dead time.
o Scaler: Providesatimedcounter
for accumulating the detector counts far a
preset time. The count range is up to
999,999 counts with count times f.?om 1
second to 65,535 seconds in one-second
increments.
0 Integrated Dose: Provides a
readout of the total accunmlated dose and
the accumulation time in minutes. This
readout is also corrected for detector dead
time and displays in the same units as the
digital ratemeter.
page 2

l CIDCKTheM2350hasarealtime
clock that keeps the time (24hour format) and
date.
programmable up to 2500 volts in one-volt
increments.
l USER ID: A fifteen-character identifi-
cation code that can be used to identity each
instrument. The characters can be numbers or
letters.
l DEIlZIORMODElLNUMB~This
function allows the detector settings to include
the model number of the detector. The model
can be up to nine characters long and can
include both numbers and letters.
l DEIKI0R SELKIlaS: Up to
sixteen different detector setups can be loaded
into the M2350. Once the setups are loaded a
single co-d is all that is required to
change setups to a different detector. The
following items are stored for each detector
setup:
o Detector calibration constant
0 Detectordeadtime
0 Detector high voltage
0 Detector model number
0 Detectorserialnumber
0 Display range multiplier
o Display time base
0 Display units
l DEIKTORSEEUALNUMB~UMBER:s
function allows the detector serial number to
be saved so there will be a record of which
detector took which data.
. DJSPLAY RANGE MMlXIPLWt
The digital ratemeter can be programmed to
auto-range or be forced into using a multiplier
of micro, milli, none, or kilo.
l DISPLAY TIME BASE: For all units
except Ci/d and E%q/cn?, the digital
ratemeter can have a time base of seconds,
mini, or hours.
M2350 Data Log&r
l DISPLAY UNlTS: The digital
o Integrated dose alarm setting
0 overload current
0 Ratemeter alarm setting
0 scaler alarm setting
0 Scaler count time
o Threshold
oWindow
ratem- and integrated dose can be $ro-
grammed to readout in the following units:
oad, @MY9 NW9 (W, 09, -mg),
@)isintegratioion, (C)aunts, (Ci/cn?), or
wcti.
l DETECTOR CALIBRATION
CXWSTANT me digital ratemeter and
integrated dose can be calibrated to read
directly in the desired units. This is
accomplished by dividing the dead t$ne
corrected ratemeter or integrated dose by the
calibration constant.
l ALf!RMS: There are programmable
almns for the digital ratemeter, scaler, and
integrated dose. When a level is equal to or
exceeds the alarm setting the audio output is
turned on and a status message is displayed in
the appropriate display line. The audio output
can be turned off by pressing the ACK-
NLDGE button ‘Ihe status message will
continue to display the alarm message until
the alarm condition is no longer present.
l DETEcroR DEAD ‘Ills The
M2350 allows for the correction of dead time
1OsseS.
l DEIlXXX HIM VOLTAGE:
Supplies the bias voltage to the detector. It is
l OlvBImD CURRENTP. used to
detect when the detector is drawing excessive
current and the output fi-om the detector may
not be accurate. It is programmable up to 40.0
p4 in 0.1 /LA increments. It also can be
disabled if desired.
page 3

M23!50 Data Logger
l 0-W If the count rate is
high enough for 75% dead time conection, the
digital ratemeter will display the message
‘OVER RANGE!’
. sm alum mm This
provides the preset time the scaler counts. It
can be set from 1 to 65,535 seconds in
one-second increments.
0 Location code: This is the location
code the user enters. It can be up to ten
characks long and can be a combination
of numbers and letters. The location code
does not need to be unique for each
readiig since the sample number is
unique.
1
. sINGLJ3m
ANALYzEFt
The SCA can be disabled to allow for gross
counting or enabled to allow energy discrim-
ination. Both the threshold and window are
rrosle up to 1000 in integer
.
l LQGGlNG MEMORY: Up to 250
samples may be stored inthe internal logging
memory and be retrieved later. The following
data is saved:
0Sample number: This is the unique
sample number of the logged reading and
will be fkom 0 to 249.
0 Status: This records the IV2350
status at the time of the reading. It con-
tains the alarm, ov&ad, and over-range
conditions.
0 Time: The time is stored as
hours,minutes and is in the 24 hour
format.
0 Count data: This is the value of the
counter that was logged. The counter is
either the digital ratemeter, scaler, or
integrated dose.
0 Logging mode: Ibis is the
identifier that records the type of reading
whether it was the digital ratemeter,
scaler, or integrated dose.
0 Count time: This is the count time
of the reading. For the digital ratemeter, it
is 0. For the scaler, it is the number of
seconds the scalar counted for. For the
integrated dose, it is the number of
minutesthattheintegrateddosehasbeen
accumulating.
l luxx;ED DATA DISPLAYz This
allows the readout of a specified data sample
without requiring the complete memory to be
dumped.
l RECYCIE The M2350 has a recvcle
0 Date: The date is stored as month,
day, yf=*
0 Detector number: This is the
number of the detector (from 0 to 15)
whose settings were loaded into the data
loggeratthetimethereadingwastaken.
mode where automated logging can-be
pe~%ornxd The recycle cycle can consist of
f?om 1 to 6 logging cycles per recycle. Each
of the 6 logging cycles can be setup to log the
digital rakmekr, scaler, or integrated dose
and then wait from 1 to 65,535 seconds before
karting the next logging cycle. The recycle
mode can be programmed to continue until the
data logger memory is full or for a set number
of recycles.
page 4

lM23!50 Data Logger
5.OPER4'IlNGl'RCXXDuREs
5Mnstallingbatteries 5.3 Performing a ‘kold statt”
To install the batteries,unscrewthebattery
door latch and insert four “D” cell batteries in
the battery compartment. The correct position
of the batteries is marked on the bat&y door.
Refasten battery door.
5.2Ope1atingtheimtn1ment
Switch the
power ON/OFF
switch to the ON
position. The
display should
turn all blue afkr
about one second.
The blue will
remain on for two
37102N16
MEMORY TEST OK
CJ?UTESTOK
$llle 1.
seconds and then self check.
be replaced with
the display in Figure 1. After two seconds, the
display will then be replaced with the last
display that was active before the power was
turned off. If the display appeam abnormal, a
cold start needs to be done.
After the power up cycle is completed,
select the desired diilay mode and the
desired detector parameters and proceed with
the instmmnt operation.
NOTE
P A cold start wil clear all detectors
and also clear the logging memory.
OncedoneJhedata~be
recoVered.
A cold start is needed to clear the
M235O's memory if the batteries have been
removed long enough for the memory to be
lost or if the user desires to reset the memory
before setting up for specific detectom.
To do a cold start, enter SSRwith either
the hand held knninal or the optical wand
The display should turn all blue afler about
one second The blue display will remain on
for two seconds and then be replaced with the
display in Figure 2.
This will be dis-
played for two
seconds and then
‘the IV2350 will
MEMORY TEST OK
resume operation
mu TEST OK
with all settings COLDINITIALJZE
set to their default
Values.
*
Cold Start Execute.
,