Polimaster PM1704A User manual

© 2013-2015 Polimaster Ltd. All Rights Reserved
SPECTROSCOPIC
PERSONAL RADIATION DETECTORS
PM1704A
models
PM1704A
PM1704A-M
PM1704A-GN
PM1704A-GNM
OPERATIONS MANUAL
http://www.polimaster.com

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Contents
READ THIS FIRST..................................................................................3
PRECAUTIONS .....................................................................................4
1. GENERAL DESCRIPTION .................................................................. 5
1.1. Specifications...............................................................................................................................6
1.2. Display and control buttons................................................................................................7
1.3. Clip installation/removal.......................................................................................................9
1.4. Battery installation.................................................................................................................10
1.5. Setting current date/time..................................................................................................11
1.6. Selecting battery type..........................................................................................................11
2. OPERATION....................................................................................12
2.1. Turning the instrument ON/OFF ...................................................................................12
2.2. Going through self-tests and background calibration .....................................12
2.3. Normal operation (Search mode) .................................................................................12
2.3.1. Getting a new background ..................................................................... 13
2.3.2. Setting a new threshold (n coefficient).............................................. 13
2.3.3. False alarms ................................................................................................... 14
2.3.4. Autocalibration ............................................................................................ 15
2.4. Measurement mode............................................................................................................. 15
2.4.1. Setting new thresholds............................................................................. 16
2.4.2. Resetting statistics (restarting measurement)................................. 17
2.5. Acquiring gamma-scintillation spectra .....................................................................17
2.5.1. Establishing proper count rate .............................................................. 17
2.5.2. Acquiring spectra ........................................................................................ 18
2.6. Radioisotope Identification ..............................................................................................18
2.6.1. Selecting the library and setting up identification parameters19
2.6.2. Displaying peaks Information ................................................................ 20
2.7. DE measurement mode ..................................................................................................... 20
2.7.1. Setting new thresholds............................................................................. 21
2.7.2 Reset value of the accumulated DE ...................................................... 21
3. SETUP .............................................................................................22
4. COMMUNICATION WITH COMPUTER ...........................................23
5. MAINTENANCE ..............................................................................24
5.1. Energy Calibration Check...................................................................................................24
5.2. Manual Energy Calibration................................................................................................25
6. TROUBLESHOOTING......................................................................27

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READ THIS FIRST
Thank you for purchasing this Polimaster product. Before operating the
unit, please read this guide thoroughly, and retain it for future reference.
Spectroscopic Personal Radiation Detectors (SPRDs) PM1704A are
designed to detect, search, locate and identify gamma emitting
radioactive sources as well as detect neutron radioactive materials
(gamma-neutron models) and measure dose and dose rate of gamma
radiation (GM detector models). The user need not be an expert in health
physics to operate this instrument; however, understanding basic
parameters and settings is required for proper operation.

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PRECAUTIONS
1. Avoid severe mechanical shocks and submerging the
instrument in water.
2. Do not store the instrument with the battery installed. The
battery may leak once depleted causing severe damage to the
instrument and voiding the warranty.
3. Keep the instrument at least 4 inches from radio emitting
sources to avoid false positives.

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1. GENERAL DESCRIPTION
PM1704A (hereinafter referred to as the “instrument/s”) is a new family
of extremely sensitive, small and power safe Spectroscopic Personal
Radiation Detectors. When the instrument is ON it continuously monitors
radiation in the environment and compares it to a normal background
and threshold set by the user. In the event that thresholds are exceeded,
PM1704A warns the user with audio and/or vibration signals about the
presence of a radiation source nearby and enables manual and/or
automatic express identification, as well as transmission of spectra files
to remote reach back system.
All operation history is stored in the instrument’s non-volatile memory
and may be downloaded to a personal computer through a USB
connection or via Bluetooth 4.0 interface. PM1704A is also equipped
with built-in GPS to enable geocached data logging.
The instrument may be used both indoors and outdoors by a variety of
users whose professional duties involve detection and location of
radiation sources.
There are four different modifications of PM1704A: two gamma-only and
two gamma-neutron. They differ in the number and kind of detectors
used.
Gamma-only Spectroscopic Personal Radiation Detectors:
•PM1704A is basic Spectroscopic Personal Radiation Detector
with CsI(Tl) scintillation detector. The smallest and lightest
model in PM1704A product line;
•PM1704A-M is combined Spectroscopic Personal Radiation
Detector-Dosimeter with two independent gamma detection
channels: highly sensitive CsI(Tl) scintillator and additional
energy compensated Geiger-Muller detector to extend the
measurement range of the SPRD up to 1,000 R/h;
Gamma-neutron Spectroscopic Personal Radiation Detectors:
•PM1704A-GN is a standard gamma-neutron Spectroscopic
Personal Radiation Detector with two independent detection
channels: one for gamma (CsI(Tl) scintillator) and one for
neutron (Li6I(Eu) scintillator);
•PM1704A-GNM is a combined gamma-neutron Spectroscopic
Personal Radiation Detector-Dosimeter with three independent
detection channels. In addition to detectors used in PM1704A-
GN, the GNM model is equipped with an additional energy
compensated Geiger-Muller detector to extend the
measurement range of the SPRD up to 1,000 R/h.

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1.1. Specifications
The table below summarizes the basic specifications of and major
differences between four PM1704A models:
Gamma
Gamma-neutron
PM1704A
PM1704A-M
PM1704A-GN
PM1704A-GNM
Detectors
Spectroscopic gamma
CsI(Tl) detector




Li6(Eu) neutron detector
N/A
N/A


Geiger Muller detector
N/A

N/A

Sensitivity, gamma
(search mode)
for 137Cs, not less than
100 cps/(μSv/h) // 1 cps/(μR/h)
for 241Am, not less than
300 cps/(μSv/h) // 3 cps/(μR/h)
Sensitivity, neutrons
for Pu-α-Be, not less than
N/A
N/A
0.07 counts per cm2/neutron
for thermal neutrons, not
less than
N/A
N/A
2.0 counts per cm2/neutron
Indication range (search
mode)
gamma
from 1 to 9999 cps
neutron
N/A
N/A
from 0.01 to 999 cps
Indication range, gamma
0,01 – 130
µSv/h
(1 μR/h –
13 mR/h)
0,01 µSv/h –
13 Sv/h
(1 μR/h –
1300R/h)
0,01 – 130
µSv/h
(1 μR/h –
13 mR/h)
0,01 µSv/h – 13
Sv/h
(1 μR/h –
1300R/h)
Accuracy of exposure rate
measurement
in collimated
Cs-137 radiation:
- for PM1704A, PM1704A-
GN: from 0,1 -100 μSv/h (
10
μR/h to 10 mR/h);
- for PM1704A-M, PM1704A-
GNM: from 0,1 μSv/h -
10
Sv/h (10 μR/h to 1000 R/h);
)HK(20 1
⋅
+±
at 68 °F (+20°C)
Additional exposure rate
measurement error due to
temperature variations
±15% in the temperature range from -4 to +122 °F (-20 to
+50°C)
DE Indication range
N/A
0,01 µSv –
1,3 Sv
10 μR
–
130 R
N/A
0,01 µSv –
1,3 Sv
10 μR
–
130 R
Accuracy
of DE measurement from
0,1 μSv to 1 Sv
N/A
±20% at 68 °F
(+20°C)
N/A
±20% at 68 °F
(+20°C)
Energy range
gamma
0.033 – 3.0 MeV
neutron
N/A
N/A
thermal to 14 MeV
Response time
0.25 s
Radionuclide
identification
In accordance with ANSI 42.48 requirements

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Number of MCA channels
1024
Energy resolution, not
more than
9% at 0.662 MeV Cs-137
Alarm types
visual, audible, vibration
Power requirements
one AA size battery
Battery lifetime
up to 300 hours
PC communication
USB, Bluetooth 4.0 interfaces
Data collection, at least
1000 data points, 100 spectra files
Environmental:
temperature range
humidity
-4 to +122 °F (-20 to +50 °C)
up to 98% at +104 °F (+40 °C)
Water tightness
IP65
Drop test
1.5 m
Dimensions
75х87х38
mm
102х87х38
mm
102х87х38
mm
117х87х38 mm
Weight
230 g
260 g
280 g
300 g
1.2. Display and control buttons
An external view of the instrument is presented below:1
1This section describes the instruments’ front panel and LCD screen
using as an example the PM1704A-GN model switched on and in Search
mode.

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The instrument’s front panel bears:
-two control buttons located on the top panel of the instrument:
MODE/SET button “” (1), and SELECT button “” (2). These
buttons perform different functions depending on the mode
used.
-sound alarm speaker (3),
-LCD screen (4),
-luminance sensor (5),
-light alarm indicator (LED) (6).
The instrument’s display has three main information zones that are used
to display the following information:
Zone 1 – service information panel. May display the following symbols:
- external power source;
- audio and vibration alarms are disabled;
- audio alarm is enabled;
- vibration alarm is enabled;
- Bluetooth module is enabled;
- GPS module is enabled;
– battery charge level;
−Search mode is enabled;
02:44 (13:52) - current time.
Zone 2 – main working screen. Different information is displayed
depending on the operation mode of the instrument.
Zone 3 - analog bar on the bottom of display. Depending on which
mode the instrument is in, the analog bar may indicate time left until
self-tests or background calibration are completed or, if the alarm is
triggered in normal operation mode, the relative value of the count rate
in excess of the calculated threshold.

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1.3. Clip installation/removal
The instrument (except the basic PM1704A model) has a clip and may be
fasten to the user’s belt. The clip may be removed using a screwdriver or
similar tool, and easily replaced later, as shown in the pictures below:

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1.4. Battery installation
The PM1704A series is shipped without the battery installed. To install
the battery, unscrew the two fasteners located on the both sides of the
unit (using a coin, turn the fastener anti-clockwise to unlock them), and
remove the battery compartment cover (see picture below). Then insert
a single AA-type battery into the battery holder following polarity
instructions on the label, reinstall the battery compartment cover and
tighten the fasteners. When the battery is properly installed, the audio
and vibration alarms are initiated for a short period of time. In a few
moments, the display will show the firmware version and battery charge
level before switching to the date/time setting menu.

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1.5. Setting current date/time
When the instrument is turned ON after a long period of storage without
a battery, it is necessary to set the current date and time. To do this, use
the SELECT button to move the up- and down-arrows to change the
corresponding number and use the MODE button to set the new value.
To save the instrument’s date and time settings, press the SELECT button
until the up- and down-arrows disappear and then press the MODE/SET
button. The instrument is now ready to use.
1.6. Selecting battery type
The PM1704A series can be powered by either regular alkaline or
rechargeable NiMh batteries. Therefore, after the first time the
instrument is turned on, the user has to select the proper battery type in
the instrument SETTINGS menu, as shown below:
If a rechargeable battery is installed and selected in the SETTINGS menu,
it will be possible to recharge the instrument by connecting it to the USB
charger.
When the instrument is ON, the battery charge level is indicated in the
upper part of LCD with the sign . When battery voltage drops below
a critical level, the Low Battery warning sign is displayed. Turn the
instrument off and follow the instructions above to replace/recharge the
battery.
WARNING! Please make sure the proper type of battery is selected in the
SETTINGS menu. Otherwise the battery may overheat or leak, and this will
void the warranty.

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2. OPERATION
2.1. Turning the instrument ON/OFF
To turn the instrument on, press and hold down the MODE/SET button. If
the battery is good, the audio and vibration alarms are initiated for a
short period of time, and then the display briefly shows the firmware
version and battery charge level before initiating self-test procedures.
The message “TEST” is displayed during this operation.
To turn the instrument OFF, go to the SETTINGS menu and select POWER
OFF. The LCD will display the “POWER OFF” message and after a couple
of seconds goes blank. Now the instrument is turned off.
2.2. Going through self-tests and background calibration
After the self-tests are completed the audio and/or vibration alarms are
activated for approximately 1 second before the instrument initiates the
background calibration. The message "CALIBRATION" is displayed on the
LCD during this process, in which the instrument measures the gamma
radiation background and calculates alarm levels given a value of n
coefficient2. After background calibration is finished, PM1704A is ready
for normal operation.
2.3. Normal operation (Search mode)
When self-tests and background calibration are finished the instrument
is ready for operations and automatically goes into Search mode. In
Search mode, the instrument displays the current value of gamma and
neutron radiation (for gamma-neutron models only) in counts per
second (cps) and automatically compares it with the threshold value
obtained during background calibration.
This allows the user to effectively search and locate radioactive sources.
When a radioactive source is detected (the calculated threshold is
exceeded), the instrument’s visual, audible and/or vibration alarms are
triggered. As the PM1704A moves closer to the radiation source, the
frequency of audio and/or vibration signals increases thus enabling the
user to determine the direction of the source location.
When the alarm signals reach maximum frequency it is recommended to
run the background calibration procedure (see section 2.3.1.) while
keeping the location of the instrument unchanged. After background
calibration is completed, the user may continue to seek the location of
the radiation source. If necessary, this procedure may be repeated
several times until a gamma radiation source is located.
2See section 2.3.2 for more information.

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If the value of the count rate exceeds the upper measuring limit of the
instrument, an overload message is displayed.
The analog bar on the bottom of the display on PM1704A and PM1704A-
M models in Search mode indicates the relative value of the alarm level
compared to the upper count rate limit of the detector.
2.3.1. Getting a new background
The user may run a background calibration whenever it is necessary
during normal operation of the instrument. It is recommended to do this
every time the radiation background significantly changes, e.g., upon
entering or exiting a building, or otherwise moving from place to place. If
the instrument is not calibrated as needed, its alarm will be triggered
more frequently than usual in Search mode without any radioactive
sources present or, alternatively, it could lose sensitivity to the presence
of a radiation source3.In these instances, it is necessary to allow the
instrument to acquire a new background and recalculate thresholds.
To do this, press and hold the SELECT button until the Search mode
menu appears on the display, and select “CALIBRATION”. The unit is now
acquiring a new background reading. This process takes approximately
one minute. When the display returns to the normal numeric display, the
unit has the new background reading and is ready for normal operation.
2.3.2. Setting a new threshold (n coefficient)
Alarm levels in Search mode are derived from the ambient background.
When the instrument runs through background calibration, it acquires a
background reading and calculates the alarm levels automatically, based
on the value of the n coefficient set by the user.
The manufacturer default value of the n coefficient is 5.4, the response
time and false alarm level specified in the ANSI 42.32 standard. To set up
new n coefficient in Search mode, press and hold the SELECT button
until the Search mode menu appears on the display, and select
“THRESHOLDS”, then ”THRES. GAMMA” to enter the n coefficient – the
procedure is shown below:
3PM1704A-GNM may be set to automatically adjust to the new
background in user software.

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To increase the value of a particular digit of the threshold value, press
and hold the MODE/SET button until an up-arrow appears above the
digit. By pressing the upper button again, the value of the specific digit
will increase.
To decrease the value of a particular digit of the threshold value, press
the SELECT button until a down-arrow appears below the digit. By
pressing the MODE/SET button, the value of this particular digit will
decrease, as shown in the pictures below:
To save a new value for the n coefficient, press and hold the SELECT
button until the arrow disappears, then press the MODE/SET button. The
instrument will save the new alarm threshold value and automatically
run a new background calibration.
The value of the n coefficient may be set in the range of 1.0 to 9.9 in 0.1
increments. The smaller the value of the n coefficient is, the more
sensitive the instrument is to changes in background radiation, however,
this also increases the rate of false alarms. The larger the value of the n
coefficient is, the less sensitive the unit becomes to minor changes in
background radiation, responding only to large radiation field variations
(when a strong radiation source is nearby) and the probability of false
alarms decreases.
2.3.3. False alarms
All radiation detection systems experience false alarms. The number of
false alarms is dependent upon many factors, such as changes in
ambient background radiation and system set-up. We recommend a
system set-up that produces a maximum of two false alarms per eight
hours of operation under normal conditions (manufacturer preset values
for the n coefficient).
The occasional “chirp” from the unit lets the operator know that the unit
is still functioning. Such alarms are not regular and, therefore, may be
easily distinguished from true alarm signals triggered by gamma
radiation sources.

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PM1704A, -M
PM1704A-GN, -GNM
2.3.4. Autocalibration
PM1704A can adjust to slow changes in gamma-radiation background
automatically if this function is enabled in the instrument’s advanced
settings (Restricted mode). PM1704A will adjust alarm thresholds to a
higher or lower radiation background automatically, when it is in an
environment with gradually changing levels of gamma radiation. This is
especially convenient when one must move from an area with a higher
radiation background (e.g. inside the building) to an area with a lower
radiation background. The instrument will adjust the thresholds
automatically after a period of time to correspond to the new
background. The manufacturer default value is enabled.
2.4. Measurement mode
In Measurement mode, the instrument displays the
current value of gamma radiation (dose equivalent
rate - DER)4and automatically compares it with the
preset threshold values. In gamma-neutron models
the LCD screen also displays the neutron count rate,
and the instrument continues to operate in Search
mode also using the neutron detector. In the event
that the threshold value is exceeded, audible and/or
vibration alarms are activated to warn the user of
the presence of a gamma-neutron radiation source
nearby. The % value displayed on the LCD is a
coefficient of variation of the current readings.5
NOTE: The instrument measures the dose equivalent rate and dose
equivalent of gamma and x-ray radiation. The units of measurement for
these quantities are mrem, rem, µrem/h, mrem/h, rem/h, however the
instruments LCD indication is "mR", "R", "μR/h", "mR/h", "R/h".
PM1704A models allow the user to set up two independent gamma
thresholds in Measurement mode that trigger distinguishable sound and
vibration alarms when exceeded. This allows the user to use one
threshold as a WARNING indicator, and the second threshold as a
DANGER indicator. The analog bar on the bottom of the display of
PM1704A and PM1704A-M models in Measurement mode indicates the
relative value of the dose rate over the two preset thresholds, depicted
as “”.
4Measured dose rate values in models PM1704A and PM1704A-GN are
not energy compensated.
5The lower this value is, the more accurate the readings of the
instrument are. The 95% reading accuracy rate is achieved when the
coefficient of variation is below 10%.

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Unlike Search mode thresholds, the threshold values in Measurement
mode are preset by the user and do not depend on the background
radiation.
NOTE: The second dose rate threshold (DANGER) will go off in any mode,
including Settings, Search, etc., indicating that the radiation level exceeds the
upper value set by the user. To deactivate the alarm temporarily (default
setting is 1 min.), press any button.
Similarly, the PM1704A-GN and PM1704A-GNM models continue to
search for neutrons in Measurement mode, as described above. Thus any
neutron alarms will go off even in Measurement mode. To deactivate the
alarm temporarily (default setting is 1 min.), press any button.
2.4.1. Setting new thresholds
The manufacturer default settings are 5 µSv/h (500 µR/h) for the
WARNING threshold (THRESHOLD 1) and 100 µSv/h (10 mR/h) for the
DANGER threshold (THRESHOLD 2). To set new threshold values press
and hold the SELECT button until the Measurement mode menu appears
on the display, then press the MODE/SET button to select “THRESHOLD
1” or “THRESHOLD 2” to change the corresponding threshold value:
In this mode, pressing the SELECT button will toggle between changing
the threshold measurement units (μR/h, mR/h or R/h), moving the
decimal point, and increasing/decreasing the corresponding digit of the
threshold value. To change a particular unit or value press the MODE/SET
button when the corresponding position is highlighted or selected by an
arrow. In order to increase the current value, use the SELECT button to
set the up-arrow, then use the MODE/SET button to select the desired
number. To decrease the current value, use the SELECT button to set the
down-arrow then use the MODE/SET button to set the desired number.
In order to save the new threshold value, press the SELECT button until
any selection or arrows disappear and then press the MODE/SET button.
The instrument will save the new settings and automatically return to
Measurement mode.

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2.4.2. Resetting statistics (restarting measurement)
When the instrument measures the dose rate it displays the average
value of several readings over time to improve accuracy. Therefore, the
dose rate displayed on the LCD will change very slowly when there are
small changes in background radiation. It is possible to reset the
statistics manually in order to make the instrument acquire new
measurements.
To do this press and hold the SELECT button until the Measurement
mode menu appears on the display and then select “RESET STAT” by
pressing the MODE/SET button. Doing so restarts measurement of the
dose rate, which leads to a sharp increase of the coefficient of variation
displayed in Measurement mode.
When value of the coefficient of variation drops below 10% the readings
displayed by the unit are considered statistically acceptable and can be
used.
2.5. Acquiring gamma-scintillation spectra
PM1704A is designed to allow the user to acquire
gamma-scintillation spectra and perform express
radioisotope identification. This is a critical feature
that helps to distinguish between real threats and
false positives, thus saving critical time from the
moment the source is detected and aiding in decision-making on how to
proceed. It also allows the operator to send collected spectra to a remote
fusion center or reachback system for advanced processing and
identification.
To begin spectra collection, press the MODE/SET button until the unit
displays the message “SPECTRUM”, then press the SELECT button to enter
the Spectra Accumulation menu and select “START”. The LCD will display
the average count rate of the gamma radiation and ask the user to set the
optimum value for correct spectra accumulation.
2.5.1. Establishing proper count rate
For PM1704A, as for the majority of SPRDs, it is very important to have
count rate readings on the display within a certain interval, between 100
cps and 500 cps (marked on the analog scale at the bottom of the screen
by “”) to acquire good quality spectra.

18
If the count rate is below the bottom limit of the optimum detector load,
the instrument shows the message “COUNT RATE: LOW”. In this case it is
necessary to move the instrument closer to the radioactive source to
increase the count rate value on the display.
If the count rate is above the upper limit of the optimum detector load,
the instrument shows the message “COUNT RATE: HI”. In this case it is
necessary to move the instrument away from the radioactive source to
decrease the count rate value on the display. The user must observe
safety rules and organizational instructions at all times when working
near radioactive sources.
2.5.2. Acquiring spectra
If the count rate is within the optimal interval, the instrument displays
the message “COUNT RATE: OK”. Press the MODE/SET button to start
spectra acquisition. During this process, the display shows the following
information:
-“SPEC TIME” – accumulation time in seconds;
-“COUNT RATE: OK/LOW/HI” message;
-count rate analog scale.
Please try to keep such a distance from the source and the instrument
that during all time of spectra accumulation the value of the count rate
on analog scale is within the marks and the message is “COUNT RATE:
OK”.
In order to save the collected spectrum, press the
MODE/SET button and select “SAVE”. The instrument
will display the message “Saving...” and the filename
of the saved spectrum. After that it will provide an
option to exit the spectrum collection mode.
2.6. Radioisotope Identification
PM1704A identifies the exact type of radioactive source that triggered an
alarm. There are two options to do that: one is directly in Search mode,
by going to the Search mode menu and selecting “Identify”. This will
commence a procedure similar to the one described in section 2.5.2, and
the following information will be displayed on the instrument LCD:
where TIME LEFT indicates the approximate time required to finish
spectra accumulation and generate identification results.

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During this process, it is important to keep the count rate within the
optimal detector load range as described in section 2.5.1.
The second option to enter Radioisotope Identification mode is to select
IDENTIFY from the Spectra Acquisition menu. The instrument will ask the
user to specify a spectra name stored in the memory or use the current
spectra, in the process of accumulation.
Upon completion of identification, the LCD will
display the following information:
-type of the radioisotope(s), e.g., “TH232”;
-category of identified radioisotope
according to ANSI;
-confidence level of identification results, e.g., 58%.
To view more detailed information about the identified radioisotope
press the SELECT button, from the screen above, then select a
radioisotope of interest and press the MODE/SET button to see details.
The following information will be displayed:
-"NUKLID" - name of the radioisotope (e.g.,
EU152)
-“TYPE” - type of the radioisotope (e.g., IND)
-“CONF” – the confidence level (e.g., 99%)
-“PEAKS” – number of peaks found (e.g., 4 of 7)
To exit this menu, press the MODE/SET button. The instrument will
return to the screen with the list of radioisotopes found.
To exit Identification mode, press the MODE/SET button.
2.6.1. Selecting the library and setting up identification
parameters
Which isotopes can be identified by the PM1704A series depends on
which library is loaded into the instrument memory using the User
Software. Several isotope libraries, including custom ones, can be used in
the instrument. Selecting the proper library and setting identification
parameters can be done in the Identification mode menu.
To enter the Identification mode menu press and hold the SELECT
button. The instrument will display a submenu as follows:
This submenu allows the user to:
-exit Identification mode (EXIT MODE);

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-restart the identification process (RESTART). This option will
reset all accumulated statistics and start the identification
process from the very beginning;
-choose the library of radionuclides (LIBRARY);
-set the maximum time for identification (TIMEOUT). If this value
is established the identification process will stop after the
specified period of time and the result will be displayed. This
may show inaccurate values, however, because of high
statistical uncertainty. The manufacturer default is set to
DISABLED. In this case the identification results will be displayed
automatically, once the accuracy of spectra acquisition and
identification reaches the proper confidence level;
-adjust auto start of identification interval (AUTO START). If this
value has been set the instrument will switch to Identification
mode automatically from Search mode after the given time
interval of the instrument’s alarm. If this value is set to
DISABLED, then it will not run the identification process
automatically.
2.6.2. Displaying peaks Information
The PM1704A series is capable of displaying more detailed information
about identified radioisotope peaks. To do so, return to the Spectra
Acquisition menu and select PEAKS. The instrument will display the
following information:
To see more information about the peaks, select any peak using the
SELECT button and then press the MODE/SET button. The instrument will
display energy (keV), number of channels, FWHM (%), and area.
To exit Peaks menu press the MODE/SET button.
2.7. DE measurement mode
Models PM1704A-M and PM1704A-GNM have DE
measurement mode. To get in this mode shortly press
MODE/SET button in DER Measurement mode. The
instrument will display the following information:
In this mode, the instrument displays measured values of DE, acquired
during the time shown at the bottom part of the LCD (DE accumulation
time).