Mazur Instruments PRM-7000 User manual

PRM-7000 / 8000 / 9000
Nuclear Radiation Monitor
Users Guide
Rev 1.2 Jan 2017

2| PRM-7000 / 8000 / 9000 Users Guide
Mazur Instruments
200 South Wilcox Street #448
Castle Rock, CO 80104 USA
© 2008-2017 Mazur Instruments
All Rights Reserved

PRM-7000 / 8000 / 9000 Users Guide | 3
Contents
1. Safety Information . . . . . . . . . . . . . . . . . 5
2. Controls, Indicators and Connections. . . . . . . . . . 6
3. Using The PRM Instrument For The First Time . . . . . . 7
3.1 Powering On the PRM Instrument . . . . . . . . . . . . 7
3.2 Muting The Beeper . . . . . . . . . . . . . . . . . . 7
3.3 Setting Desired Measurement Units . . . . . . . . . . . 8
3.4 Setting Time and Date. . . . . . . . . . . . . . . . . 8
4. Home Screen . . . . . . . . . . . . . . . . . . . 9
4.1 Current Measurement . . . . . . . . . . . . . . . . . 9
4.2 Average Measurement . . . . . . . . . . . . . . . . 10
4.3 Maximum Measurement . . . . . . . . . . . . . . . . 11
4.4 Minimum Measurement . . . . . . . . . . . . . . . . 11
4.5 Total Count Measured . . . . . . . . . . . . . . . . . 11
4.6 Time/Date of Maximum Measurement . . . . . . . . . . 11
4.7 Current Time and Date . . . . . . . . . . . . . . . . 11
4.8 Elapsed Time . . . . . . . . . . . . . . . . . . . . 12
5. Navigating the Menu System . . . . . . . . . . . . . 13
6. Performing a Timed Measurement (Timed Measure). . . . 14
6.1 Perpetual Timed Measurements . . . . . . . . . . . . . 15
7. Changing the Units of Measurements (Set Units) . . . . . 15
8. Selecting User Preferences (Settings) . . . . . . . . . 15
8.1 Beeper On/Off . . . . . . . . . . . . . . . . . . . . 15
8.2 LED On/Off . . . . . . . . . . . . . . . . . . . . . 16
8.3 Alarm On/Off . . . . . . . . . . . . . . . . . . . . 16
8.4 Setting Alarm Threshold in mR/hr (mR/hr Alarm) . . . . . . 16
8.5 Setting Alarm Threshold in uSv/hr (uSv/hr Alarm) . . . . . . 16
8.6 Setting the Time and Date (Set Time/Date). . . . . . . . . 16
8.7 Internal Battery Power Management Setting (Bt-Pwr:) . . . . 17
8.8 External Power Management Setting (Ex-Pwr:) . . . . . . . 17
8.9 Low AvWin . . . . . . . . . . . . . . . . . . . . . 18
9. Utilities . . . . . . . . . . . . . . . . . . . . . 19
9.1 Resetting Counter Values (Reset Counters) . . . . . . . . 19
9.2 Performing a Hardware Reset (Hardware Reset) . . . . . . 19

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9.3 Powering Down the Unit (Power Down) . . . . . . . . . . 19
9.4 Restoring Factory Calibration (Load Defaults) . . . . . . . 19
9.5 Displaying Battery and External Voltages (Display Bat/DC) . . 19
9.6 Calibration Procedure (Calibrate) . . . . . . . . . . . . 20
10. Configuring the Audio/Data Connector
(Ext Audio/Data) . . . . . . . . . . . . . . . . . . 21
11. Data Logging . . . . . . . . . . . . . . . . . . . 22
11.1 Setting the Interval and Starting Data Logging . . . . . . . 22
11.2 Checking Log Status While Logging . . . . . . . . . . . 22
11.3 Stopping the Log . . . . . . . . . . . . . . . . . . . 23
11.4 Sending (Uploading) Data to a PC or Mac . . . . . . . . . 23
12. Selecting the User Interface Language (Language) . . . . 25
13. Replacing the Internal Battery . . . . . . . . . . . . 26
14. Fundamental Measurement Procedures . . . . . . . . 27
14.1 Determining Background Radiation. . . . . . . . . . . . 27
14.1.1 About Background Radiation . . . . . . . . . . . . . . . . 27
14.1.2 Measuring Background Radiation . . . . . . . . . . . . . . 28
14.2 Area Measurement and Monitoring . . . . . . . . . . . . 29
14.3 Measuring Objects . . . . . . . . . . . . . . . . . . 29
14.4 Scanning for Surface Contamination . . . . . . . . . . . 30
14.5 Measuring Food . . . . . . . . . . . . . . . . . . . 30
14.6 Measuring Liquids . . . . . . . . . . . . . . . . . . 31
14.7 Measuring Air . . . . . . . . . . . . . . . . . . . . 32
15. Interpreting Measurements. . . . . . . . . . . . . . 33
15.1 Units . . . . . . . . . . . . . . . . . . . . . . . 33
15.2 What is a Safe Level of Radiation? . . . . . . . . . . . . 34
16. Additional Resources . . . . . . . . . . . . . . . . 35
16.1 Web Resources . . . . . . . . . . . . . . . . . . . 35
16.2 Additional Reading . . . . . . . . . . . . . . . . . . 35
17. PRM-7000 Specifications¹ . . . . . . . . . . . . . . 36
18. PRM-8000 Specifications¹ . . . . . . . . . . . . . . 38
19. PRM-9000 Specifications¹ . . . . . . . . . . . . . . 40
20. Warranty . . . . . . . . . . . . . . . . . . . . . 42

PRM-7000 / 8000 / 9000 Users Guide | 5
1. Safety Information
This symbol indicates important information that
requires additional attention by the user.
High Voltage is present in the PRM Instrument. This
symbol indicates that additional caution should be
exercised by the user.
Notify your local environmental and/or hazardous
material authorities if you have concerns that your
environment consists of nuclear radiation levels that
exceed the accepted limits established by the envi-
ronmental or hazardous materials agencies in your
locale.

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2. Controls, Indicators and Connections
PRM-7000 / 8000 / 9000
A 2-Line by 14-Character Backlit LCD
B Radioactive Event LED Indicator
C Back Key
D External Audio and Data Jack
E External DC Power Input Jack
F Up Key
G Down Key
H Sound Port
I Select/Power On Key
J Geiger-Müller Pancake Tube Window (PRM-9000 Only)
K Geiger-Müller Tube Gamma Detection Center Point
(Crosshair Printed on Bottom of PRM-7000 / 8000 Only)
L Geiger-Müller Tube Alpha Detection Window (PRM-8000 Only)

PRM-7000 / 8000 / 9000 Users Guide | 7
3. Using The PRM Instrument For The First Time
This section provides some basic operations most new users will want to perform before
using the PRM Instrument.
3.1 Powering On the PRM Instrument
Press and hold down until the start up message and serial number is displayed on
the LCD. After approximately three seconds the unit will default to the home screen and
begin displaying the current measurement. The unit will beep every time it detects an
ionized radiation particle.
This detection is normal everywhere as background radiation exists everywhere. Your
particular background radiation level is dependent on many factors including altitude. For
example, in Castle Rock, Colorado a normal background radiation measurement is 0.022
mR/hr while in Miami, Florida a normal background radiation measurement would be in
the 0.012 mR/hr range. For comparison, on an airplane, at cruising altitude of 40,000
feet, a typical reading would be in the vicinity of 0.400 mR/hr, or approximately 180
beeps per minute for the PRM-7000, 400 beeps per minute for the PRM-8000, or 1,400
beeps per minute for the PRM-9000. Additional information on background radiation and
its measurement using the PRM Instrument can be found in the Users Guide, section
14.1 “Determining Background Radiation.” For more information on radiation units see
the Users Guide, section 15.1 “Units.”
3.2 Muting The Beeper
The beeper is a vital indicator on the PRM Instrument. Changes in the rate of beeps will
be the first indication of a radioactive object or area. However, it is oftentimes desirable
to mute the beeper. To mute the beeper:
1. If the Display is off (power saving mode), press any key to wake up the
PRM Instrument
2. Press to display the “Main Menu”
3. Press two times to display the “Settings” menu
4. Press to select the “Settings” menu
5. The first setting displayed is the beeper and the factory default is
“Beeper: Medium”
6. Press to rotate through the beeper settings until you reach “OFF”
7. Press to move back to the “Main Menu” and press again to return
to the Home Screen

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3.3 Setting Desired Measurement Units
The PRM Instrument can display measurements in microrems per hour (μR/hr), millirems
per hour (mR/hr), microSieverts per hour (μSv/hr), Counts per Second (CPS) or Counts
per Minute (CPM).
1. If the Display is off (power saving mode), press any key to wake up the
PRM Instrument
2. From the Home Screen, press to activate the Main Menu
3. Press once to move to “Set Units”
4. Press key to select the Set Units menu
5. The current units will be displayed and pressing the key will
change the setting
6. Press when complete to return to the Main Menu
3.4 Setting Time and Date
1. If the Display is off (power saving mode), press any key to wake up the
PRM Instrument
2. Press to display the “Main Menu”
3. Press two times to display the “Settings” menu
4. Press to select the “Settings” menu
5. Press or to scroll through the settings. Stop at “Set Time/
Date”
6. Press to select and the Time/Date setting screen will be displayed
7. Press to move the cursor to the desired digit and to advance
the digit
8. Once the desired time and date are entered, press to save the
setting
NOTE: The Clock default Time is 00:00:00 and the default date is 01/01/11. The
clock will be reset to the default time when the user initiates a Hardware Reset or
when the battery has been replaced. The clock will continue to function when the
user powers down the device.

PRM-7000 / 8000 / 9000 Users Guide | 9
4. Home Screen
The Home Screen provides the user with the ability to quickly access measurement
information with a single key press. The and keys allow the user to scroll
through various displays as indicated in the table below. Pressing the key turns the
LCD backlight on and off.
Home Screen Operation
Toggle Backlight On and Off
or Move up and down through the seven screens:
1. Current Measurement (Section 4.1)
2. Average Measurement (Section 4.2)
3. Maximum Measurement (Section 4.3)
4. Minimum Measurement (Section 4.4)
5. Total Count Measured (Section 4.5)
6. Time/Date of Maximum Measurement (Section 4.6)
7. Current Time and Date (Section 4.7)
8. Elapsed Time Since Power Up, or Reset (Section 4.8)
Select Main Menu
This Home Screen and the recording of the measurements indicated above has been
implemented in the PRM Instrument specifically to provide the user with a complete as-
sessment of the radiation level of the environment where the monitor is located.
While powered on and even in sleep mode, the PRM Instrument is constantly record-
ing this information and doing so while preserving battery power. The following sections
provide additional detail on the screens.
4.1 Current Measurement
This display indicates the current radiation measurement in the chosen measurement
units. The user can select microrems per hour (μR/hr), millirems per hour (mR/hr),
microSieverts per hour (μSv/hr), Counts per Second (CPS) or Counts per Minute (CPM).
The default unit of measurement is mR/hr.
While powered on, the PRM Instrument takes measurements every second. At low
levels of radiation (less than 6.00 mR/hr) these measurements are averaged across the
number of seconds as determined by the Low AvWin setting.
The default setting is 20 seconds. In this setting the display will update with the average
of the last 20 seconds of measurements. The setting can be changed to enable a quicker
(shorter averaging period) response time at low levels.

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Quicker response times are useful for locating objects and/or areas which are the source
of radiation levels that are above the normal background levels See Section “8.9 Low
AvWin” on page 18 for more information on the Low AvWin setting.
NOTE: Because of the random nature of background and low-level radiation, it is
normal for the Current measurement to vary while observing the display. Also note
that the maximum value viewed on the Current display is averaged over the Low
AvWin setting of 5, 10 or 20 seconds. At low levels of less than 6.00 mR/hr, The
Maximum screen (discussed below) is the Maximum value measured and averaged
across one minute. It is normal that maximum values observed in the Current Mea-
surement display will likely differ from those recorded in the Maximum Measurement
display.
4.2 Average Measurement
This display indicates the Average dose rate level that has been measured since the de-
vice was turned on, or since the Average, Maximum, Minimum, Total and Elapsed Time
counters were reset.
This capability is very useful for determining the normal background radiation and
together with Maximum and Minimum Measurement displays (discussed below), for long
term monitoring of an area or an object.
The PRM Instrument is constantly counting all pulses from the Geiger tube and calculat-
ing the average by dividing the total count by the elapsed time and then compensating
through the calibration solver to accurately represent the average in the selected dose
rate units.
NOTE: The Average, Maximum, Minimum and Total counters, as well as the Time/
Date of Maximum and Elapsed Time registers, are reset by any of the following:
1. The unit is powered on
2. A Hardware Reset is performed
3. The user resets the counters from the Utility menu
4. After the user performs a Timed Measurement

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4.3 Maximum Measurement
This display indicates the Maximum dose rate level that has been measured since the
device was turned on, or since the Average, Maximum, Minimum, Total and Elapsed
Time counters have been reset. This capability provides valuable insight into one-time
events or conditions that occur while the user is away from the device.
When a new maximum is recorded, the PRM Instrument notes the time and date and
stores this information for later viewing by the user.
4.4 Minimum Measurement
This display indicates the Minimum dose rate level that has been measured since the de-
vice was turned on, or since the Average, Maximum, Minimum, Total and Elapsed Time
counters have been reset. This provides useful information as to the minimum value the
device has measured.
NOTE: At low levels of less than 6.00 mR/hr, The Maximum and Minimum are aver-
aged over one minute. At higher levels, the Maximum and Minimum are determined
by measurements recorded every second.
4.5 Total Count Measured
This display indicates the total number of pulses from the Geiger tube recorded by the
PRM Instrument since the device was turned on, or since the Average, Maximum, Mini-
mum, Total and Elapsed Time counters have been reset. The value is uncompensated
and indicates only the number of pulses detected by the device which corresponds to the
number of times the audible click sounds, or the LED blinks.
4.6 Time/Date of Maximum Measurement
When a new Maximum dose rate level is recorded, the PRM Instrument captures the
time and date that the Maximum occurred. This allows the instrument to capture and
report transient maximums in radiation level that may occur within an otherwise normal
background radiation environment. Time format on this screen is 24 hour hh:mm:ss and
the date format is: MM:DD:YY.
4.7 Current Time and Date
This screen displays the time and date of the real time clock/calendar within the PRM
Instrument. Time format is 24-hour hh:mm:ss and the date format is: MM/DD/YY.

12 | PRM-7000 / 8000 / 9000 Users Guide
4.8 Elapsed Time
This screen displays the elapsed time in days, hours, minutes and seconds since the
last reset of the Elapsed Time registers. The Elapsed Time shows the time frame durin
which the Average, Minimum and Maximum values have been established.

PRM-7000 / 8000 / 9000 Users Guide | 13
5. Navigating the Menu System
Pressing the key from the Home Screen activates the Main Menu. From the Main
Menu, users can navigate through the menus as indicated in the table below. Each sub-
menu will be discussed in the sections that follow.
Select Main Menu
or Move up or down through the sub-menus:
1. Timed Measure
This function allows users to take measurements over a de-
fined amount of time. This is useful for detecting small amounts
of contamination.
2. Set Units
Users can select either μR/hr, mR/hr, μSv/hr, CPS or CPM
measurement units.
3. Settings
This sub-menu allows the user to customize the behavior of
the PRM Instrument. Settings include those associated with
the beeper, LED, dose-rate alarm, time/date, power settings as
well as the control over the averaging performed at low dose
rates.
4. Utilities
This sub-menu includes functions to reset the measurement
counters (Average, Minimum, Maximum, Total and Elapsed
Time), perform a hardware reset, power down the device, load
the factory calibration values, display the voltage of the battery
and perform the calibration procedure.
5. Ext Audio/Data
This sub-menu is used to control the behavior of the audio/
data jack. The jack can output audio at three selectable
volume levels, provide a pulse output compatible with third
party software or output a serial data stream (optional cable
required) on the minute for data collection using a PC.
6. Data Logging
This sub-menu provides functions to control data logging to
the internal logging memory in the PRM Instrument.
7. Language
This allows the user to set the language to English or Japa-
nese
Select the desired sub-menu. Repeat the process for navigating
through the sub-menus
Return to previous menu

14 | PRM-7000 / 8000 / 9000 Users Guide
6. Performing a Timed Measurement (Timed Measure)
Timed measurements provide a measurement over a fixed period of time. Timed mea-
surements extend the sensitivity of the detector by extending the measurement over
longer periods of time.
This capability is useful for detecting low-level radiation above the established back-
ground count. Consider the opening of a flower blossom. From hour to hour the differ-
ences are hardly noticeable, but when still images are recorded over a long period of
time and played back, the changes are clearly noticeable.
Similarly, timed measurements that detect one or two additional particles every minute
will result in a noticeable difference when a 90-minute timed measurement is taken. The
resultant average would indicate a value noticeably above the normal background count.
The PRM Instrument can take timed measurements in 1,5,10,20,30,60 or 90 minutes. To
take a timed measurement, set the desired length and start the measurement as follows:
1. From the Home Screen, press to activate the Main Menu
2. Press again to select the “Timed Measure” menu
3. Press once to display the “Length: ##” setting
4. The current length will be displayed and pressing the key will
rotate through the settings. Select the desired length
5. Press once to display the “Start” command and press to start
the timed measurement
6. As the measurement progresses, the time remaining in minutes will be
displayed along with the current average value
7. If audio is enabled, a series of tones will sound indicating that the timed
measurement is complete
8. During the measurement, pressing will toggle the LCD backlight
9. After completion, or to end the timed measurement early, press any
other key. The prompt “Cancel Timed Measure?” will be displayed
10. Press (to answer YES) to end the timed measurement and return
to the Home Screen
NOTE: Once the length is chosen in Step 4 above, it will be saved. To start future
timed measurements of the same length, simply press the key three times.

PRM-7000 / 8000 / 9000 Users Guide | 15
6.1 Perpetual Timed Measurements
By resetting the in-line statistical counters - see “9.1 Resetting Counter Values (Reset
Counters)” - the combination of the Elapsed Time Display and the Average Screens
forms the basis for a perpetual, any-length, timed measurement.
The true average of actual counts over the elapsed time enables timed measurements of
hours, days or even months. This is very useful for long term monitoring.
NOTE: After completion or cancellation of a Timed Measurement, the PRM Instru-
ment will reset the Average, Minimum, Maximum and Total Count Registers, as well
as Elapsed Time Register.
7. Changing the Units of Measurements (Set Units)
The PRM Instrument can display measurements in microrems per hour (μR/hr), millirems
per hour (mR/hr) and microSieverts per hour (μSv/hr), Counts per Second (CPS) and
Counts per Minute (CPM).
1. From the Home Screen, press to activate the Main Menu
2. Press once to move to “Set Units”
3. Press key to select the Set Units menu
4. The current units will be displayed and pressing the key will
change the setting
5. Press when complete to return to the Main Menu
8. Selecting User Preferences (Settings)
Various settings can be selected to enable the user to customize the behavior of the
PRM Instrument as desired. Settings remain in place until the battery is exhausted. If, at
any time, the user desires to replace the current settings with the factory default settings,
perform a Hardware Reset of the device from the Utilities menu.
To enter the Settings Menu, press the to enter the Main Menu and use the arrow
keys to advance until “Settings” is displayed in the lower line. Press to enter the
Settings Menu. The specific settings will be discussed in the sections that follow.
8.1 Beeper On/Off
The current state of the Beeper will be displayed. Press to change. The Beeper
tone sounds when a nuclear particle is detected and provides audible feedback as to the
current measurement level.

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8.2 LED On/Off
The current state of LED will be displayed. Press to change. The LED blinks when
a nuclear particle is detected and provides visual feedback as to the current measure-
ment level.
NOTE: When the unit enters the sleep state and the LCD display is off, the settings
of the Beeper and LED will remain in effect. While these indicators have been de-
signed to enable prolonged battery life, both the Beeper and LED should be disabled
to provide the longest battery life.
8.3 Alarm On/Off
This setting is used to enable or disable the dose rate alarm. The current On/Off state of
Alarm will be displayed. Press to change. An Alarm condition will occur when the
Alarm is On and when the Alarm dose-rate level is exceeded.
NOTE: Once an alarm condition is present, the alarm will continue to sound until the
measurement is no longer greater than the threshold level.
8.4 Setting Alarm Threshold in mR/hr (mR/hr Alarm)
This setting allows the user to select the desired alarm level threshold in mR/hr units.
Once selected the display will indicate the current setting. The table below outlines how
to use the keys to enter the desired value.
8.5 Setting Alarm Threshold in uSv/hr (uSv/hr Alarm)
This setting allows the user to select the desired alarm level threshold in uSv/hr units.
Once selected the display will indicate the current setting. The table below outlines how
to use the keys to enter the desired value.
8.6 Setting the Time and Date (Set Time/Date)
Use the keys as indicated below to set the time and date. The clock is represented in
24-hour format. See “3.4 Setting Time and Date” for step-by-step instructions.

PRM-7000 / 8000 / 9000 Users Guide | 17
Setting the Alarm, Time and Date
Set mRh Alarm
Set uSv Alarm
Set Time/Date
Sets the dose rate measure-
ment in mR/hr that will result in
audible alarm
Sets the dose rate measure-
ment in uSv/hr that will result in
audible alarm
Set time and date in 24-hour
format hh:mm:ss, MM/DD/YY
to select digit
to set digit value
save setting and exit
exit without change
8.7 Internal Battery Power Management Setting (Bt-Pwr:)
This setting allows the user to specify what battery power management profile to use
when operating solely from the 9-Volt battery inside the PRM Instrument. The current
Power Setting will be displayed. Press to change.
The power settings are outlined in the table below. The factory default for battery opera-
tion is Lowest. In this setting the LCD will be turned off after 60 seconds of inactivity.
While continuing to measure nuclear radiation, the unit will enter a sleep mode in order
to conserve battery power. Once any key is pressed the LCD will resume normal opera-
tion. In the Lowest setting the backlight will be turned off after 15 seconds.
8.8 External Power Management Setting (Ex-Pwr:)
This setting allows the user to specify what battery power management profile to use
when operating from an external power source connected to the power connector of the
PRM Instrument. The current Power Setting will be displayed. Press to change.
The power settings are outlined in the table below. The factory default for external power
operation is High. In this setting the LCD and backlight will remain on. The unit detects
when external power at the proper voltage is present and will activate the external power
management setting. Similarly, the unit senses the removal of the external source and
will resume the battery power setting.
External power management is very useful for remote, long-term application of the PRM
Instrument where the device is powered by large external batteries or alternative sources
such as solar cells.

18 | PRM-7000 / 8000 / 9000 Users Guide
Power Management Settings
Power Setting Time of Inactivity Until:
(Set in Settings) LCD Off Backlight Off
Lowest 60 Seconds 15 Seconds
Medium 10 Minutes 45 Seconds
High Always On Always On
Low Battery
Condition
30 Seconds 2 Seconds
NOTE: If the LCD is turned off, the PRM Instrument will continue
to monitor and measure radiation including current, average,
maximum, minimum and total-count values Pressing any key
will “wake-up” the display and operations continue normally
until the inactivity threshold of the selected Power Setting is
exceeded.
8.9 Low AvWin
This setting allows the user to specify the time in seconds (or window) over which low-
level measurements are averaged in the Current Measurement displayed of the Home
Screen. This capability allows the user to shorten the window so that measurement
response time can be increased. Increased response time is useful for efficiently locating
specific sources of radioactive activity.
Once at this setting, the current averaging window will be displayed in seconds. Press
to change. Choices are 5, 10 and 20 seconds. The factory default is 20 seconds.

PRM-7000 / 8000 / 9000 Users Guide | 19
9. Utilities
The PRM Instrument provides a number of commands in the Utilities menu that will be
outlined in the sections below.
9.1 Resetting Counter Values (Reset Counters)
Pressing the key while at this command will reset only the Average, Maximum,
Minimum and Total counters to zero and will resume measurement. This is very useful
in cases where the instrument is exposed to a new level of radiation and it is desired to
know the average, maximum and minimum values of that particular source or location.
9.2 Performing a Hardware Reset (Hardware Reset)
Pressing the key while at this command will reset the counter in the same way as
removing all power sources from the device would. Time and Date will be reset. All
settings will return to the factory default. However, if a calibration record exists in the
device, that calibration will be used when the PRM Instrument is reset. To restore the
factory default calibration see the Load Defaults command below.
9.3 Powering Down the Unit (Power Down)
The PRM Instrument is designed to be “Always-On” and the internal battery life in sleep
mode can be up to 60,000 hours (under normal background conditions and using a lith-
ium 9-Volt battery). However, for long term storage, the user may desire to power down
the unit. Pressing the key while at this command will power down. While powered
down the unit will not take any measurements, however, the internal clock calendar will
continue to function.
9.4 Restoring Factory Calibration (Load Defaults)
Pressing the key while at this command will restore the factory default calibration
and erase any calibration data present in the device. Use this command with care.
9.5 Displaying Battery and External Voltages (Display Bat/DC)
Pressing the key while at this command will display a screen that shows the voltage
of the internal battery and any external power source connected to the power connector.
A decimal point to the left-most side of the display line indicates that the respective volt-
age is at an acceptable level.

20 | PRM-7000 / 8000 / 9000 Users Guide
9.6 Calibration Procedure (Calibrate)
Pressing the key while at this command will initiate the calibration procedure. The
Calibration Procedure Should Only Be Used By A Certified Calibration Lab. The calibra-
tion process is as follows:
1. Setup the Cs137 source for 20mR/hr for the first calibration point. The
first calibration point is 20mR/hr for all PRM-X000 models.
2. Press the key to start.
3. The unit counts down 10 seconds, beeping at each second, then takes
a 60-second measurement.
4. After 60 seconds, the unit beeps and displays the raw CPM.
5. Make a record of the CPM reading displayed for the 20mR/hr first
calibration point.
6. Press any key to go to the second calibration point. The exposure
level for the second calibration point is PRM-X000 model-depen-
dent as follows:
PRM-7000: 500 mR/hr
PRM-8000: 200 mR/hr
PRM-9000: 125 mR/hr
Table 9.6.1
7. Repeat steps 2 through 5 for Cs137 for the second calibration point
indicated in Table 9.6.1.
8. Make a record of the CPM reading displayed for second calibration
point.
9. Press any key to continue and the unit will complete calibration and
restart.
10. A decimal point to the right of the serial number will be displayed at
restart. This indicates the unit is operating from calibrated values and
not the factory settings.
NOTE: Calibration Should Only Be Performed By Certified Calibration Labs. Visit
www.MazurInstruments.com for a list of recommended calibration labs.