Rotem RAM ION Installation and operation manual

RAM ION DigiLog Meters
For Wide Range Gamma, X-Ray
and Beta Radiation Measurement
RAM ION
RAM ION-X
Operating & Maintenance Manual
Version 2.5 –November 2021
Document # PRIR43O9-2.5.DOC

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 2
Version / Revision Log: RAM ION / Operating & Maintenance Manual
Ver./Rev.#
Date
Revised Pages
Comments
1.0
March 2000
Operating & Maintenance Manual,
Document # PRIR43O9.DOC
2.1
Oct 2009
2.2
2.3
Jan 2012
July 2017
Updated Table of contents
Corrected Paragraph 3.8 Push Button
Function Table
2.4
Dec 2020
Changes in firmware and as a derivative
additional mode of operation was added
2.5
Nov 2021
Silica gel status
ROTEM Industries Ltd. reserves the right to change specifications without advance notice.
Ref. PRIR43O9-2.5.DOC

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 3
Table of Contents
1. THE RAM ION METER.....................................................................................................................................5
1.1. GENERAL DESCRIPTION ..................................................................................................................................5
1.2. FEATURES.......................................................................................................................................................5
1.3. ORDERING INFORMATION................................................................................................................................5
2. SPECIFICATIONS..............................................................................................................................................6
3. OPERATING INSTRUCTIONS........................................................................................................................7
3.1. PREPARATION FOR USE...................................................................................................................................7
3.2. STARTING-UP..................................................................................................................................................7
3.3. GENERAL FUNCTIONS .....................................................................................................................................7
3.4. THRESHOLD SELECTION..................................................................................................................................9
3.5. ALARMS..........................................................................................................................................................9
3.6. GAMMA AND BETA RADIATION MEASUREMENT...........................................................................................10
3.7. DATA STORAGE IN THE INTERNAL MEMORY ................................................................................................11
3.8. PUSH-BUTTONS FUNCTION............................................................................................................................12
3.9. BATTERIES REPLACEMENT ...........................................................................................................................14
3.10. SILICA GEL CARTRIDGE............................................................................................................................14
4. COMMUNICATION.........................................................................................................................................15
4.1. GENERAL ......................................................................................................................................................15
5. RAM ION-X.......................................................................................................................................................16
5.1. GENERAL DESCRIPTION ................................................................................................................................16
5.2. BASIC MODES...............................................................................................................................................16
6. ICRP-51 ..............................................................................................................................................................18
7. CALIBRATION INSTRUCTIONS..................................................................................................................19
7.1. ELECTRONIC CALIBRATION (PERFORM IN AN ELECTRONIC LAB BY AUTHORIZED ENGINEER) .......................19
7.2. MANUAL RADIATION CALIBRATION .............................................................................................................19
7.3. COMPUTERIZED CALIBRATION ROTEM METER CALIBRATION –RMC........................................................20
7.4. STARTING UP CALIBRATION &LINEARITY PROCESS.....................................................................................23
7.5. CALIBRATION ...............................................................................................................................................24
7.6. LINEARITY ....................................................................................................................................................26
7.7. SAVE,LOAD AND PRINT CALIBRATION AND LINEARITY CERTIFICATE .........................................................27
8. ELECTRONIC BLOCK DIAGRAMS DESCRIPTION................................................................................29
8.1. OVERALL BLOCK DIAGRAM OF RAM ION METER.......................................................................................29
8.2. ELECTROMETER BOARD................................................................................................................................29
8.3. METER..........................................................................................................................................................32
9. ELECTROMETERBOARDTESTINGWITHSTANDARDMEASUREMENTDEVICES...........................................36
9.1. POWER SUPPLIES TEST..................................................................................................................................36
9.2. LOW BATTERY CIRCUIT TEST.......................................................................................................................36
9.3. RANGE CHANGE CHECK ...............................................................................................................................36
9.4. V/F TEST ......................................................................................................................................................36
9.5. OFFSET TEST.................................................................................................................................................37
9.6. ELECTROMETER INSTALLATION AND CALIBRATION (U1).............................................................................37
10. ELECTROMETER BOARD TESTING WITH ELECTROMETER TESTER......................................38
10.1. PREPARATION FOR TESTING......................................................................................................................39
10.2. POWER SUPPLIES TEST..............................................................................................................................39
10.3. LOW BATTERY CIRCUIT TEST...................................................................................................................39

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 4
10.4. OFFSET TEST.............................................................................................................................................39
10.5. RANGE CHANGE CHECK ...........................................................................................................................39
10.6. V/F TEST ..................................................................................................................................................40
11. ASSEMBLY & DISASSEMBLY INSTRUCTIONS...................................................................................40
11.1. OPENING THE DISPLAY COMPARTMENT....................................................................................................40
11.2. CPU BOARD REMOVAL (PC #1942) .........................................................................................................40
11.3. DISPLAY COMPARTMENT ASSEMBLY........................................................................................................40
11.4. ION CHAMBER COVER DISASSEMBLY .......................................................................................................41
11.5. ION CHAMBER DISASSEMBLY (INCLUDING ELECTROMETER BOARD) .......................................................41
11.6. ELECTROMETER BOARD REMOVAL...........................................................................................................41
11.7. ELECTROMETER BOARD ASSEMBLY .........................................................................................................42
11.8. ION CHAMBER ASSEMBLY ........................................................................................................................42

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 5
1. The RAM ION Meter
1.1. General Description
The RAM ION Meter is a portable ion chamber survey meter, designed for highly stable and
accurate measurement of dose rates and integrated dose of gamma, x-ray and beta radiation. The
meter covers a measuring range of 0.1 mR/h up to 50 R/h (1 Sv/h to 500 mSv/h) in the dose-
rate mode and 1 R up to 1000 R (0.01 Sv up to 10 Sv) in the integrated dose mode.
The RAM ION survey meter combines an ionization chamber vented to atmospheric pressure,
electrometer card and a microcontroller, to offer optimal performances and special features. Two
communication ports provide a very simple and reliable method to collect and store monitored
data on site for later use, in addition to the RAM ION regular functions.
The RAM ION is a compact, battery operated, auto ranging, one hand held, lightweight and
ruggedized meter, easy to use and maintain. It is ideal for use in facilities of: Nuclear power
plants, nuclear medicine, radiography, radiotherapy, life science laboratories, nuclear research
centers and for other industrial applications.
1.2. Features
X-ray, Beta and Beta + Gamma radiation measurement.
Auto ranging digital and analog display.
Freeze mode to record the highest dose rate.
Provision of dose rate and dose alarms.
Sievert or Roentgen units.
Display illumination for use in low light areas.
Hot spot detection.
Low battery, overflow, over threshold and detector fail alarms.
Two communication ports.
NV SRAM built-in memory to store measurements data.
E²EPROM to save the meter parameters.
ICRP-51 standard.
RMV compatible.
Computerized and/or manual calibration.
X-Ray 50 nano Sec pulses dose measuring
1.3. Ordering information
RAM ION DIGILOG HR- BAK 1940
RAM ION DIGILOG LR -BAK 1950
RAM ION DIGILOG X LR - BAK 2010
RAM ION DIGILOG X HR - BAK 2000

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 6
2. Specifications
Measuring range 0.1 mR/h to 50 R/h (1 Sv/h to 500 mSv/h)
Accuracy 10% of reading, within the measuring range
Gamma energy dependence (Cs-137) Better than 20 % at 20 keV to 1.3 MeV
Angular dependence (Cs-137) Less than 5 % (for 120of front direction)
Ion chamber volume 500 cc
Chamber wall & cover thickness 300 mg/cm2
End window thickness 7 mg/cm2
Response time 2 sec. for readings above 1 mR/h, 5 sec. for auto-
ranging change, from Low Range to High Range (2
sec. + 3 additional seconds for auto-ranging delay).
Data logging 380 data records (1415 with extended memory)
Display DigiLog
(3 digits & 2 decades of analog bar-graph)
Power source Two 1.5 Volt C-type cells
100 hours of continuous operation
Automatic battery check
Temperature range Operation: -10C to +50C (15F to 122F)
Storage: -20C to + 60C (-5F to 140F)
Humidity range Up to 95% RH (non condensing)
Casing Material Splash proof plastic case
Dimensions Width: 10 cm (3.9”)
Length: 25 cm (9.8”)
Height: 19 cm (7.5”)
Weight 850 g (1.9 lb)

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 7
3. Operating Instructions
3.1. Preparation for Use
Remove the instrument from the shipping container and check for any physical damage. In the
case of damage, report it immediately to the carrier.
Do not attempt to install or operate damaged equipment since safety and performance may be
affected
3.2. Starting-up
Press the ON/OFF push-button. When the meter is turned on, it carries out a short self-test
procedure indicated by displaying all the segments on the display, and emitting two beeps for
a short period. After the self-test the meter enters to offset routine.
When the offset adjustment routine is active the SET LCDs and the 0.0mR/h reading blink on
the display. The offset adjustment is carried out for 40 seconds. When offset adjustment is
completed, the meter beeps twice. The meter is ready for use.
To turn the meter off press the ON/OFF push-button continuously for at least one second and
then release. The actual turning off will be performed after the push-button is released.
3.3. General Functions
3.3.1. Recent Modifications
The RAM ION was modified to provide an instantaneous measurement of dose rate when
subjected to pulsed radiation. When measuring pulsed radiation, the exposure duration is very
short and the firmware of the instrument was adjusted to display the average dose rate during the
pulsed X-ray exposure since the most recent timer reset. The displayed dose rate is based on
accumulated dose divided by the integration time (since instrument’s turn-on or since the timer
reset).
The internal timer is reset either by pressing the “RESET” push button twice on the instruments
panel or by a command transmitted to the instrument from the dedicated SW (RMVC), when the
instrument is connected to the PC via the USB connector.
3.3.2. Measuring Modes
The meter has two measuring modes:
1. Auto-Range - 0.1 mR/h to 250 mR/h and 0.25R/h to 50R/h
2. High Range Only - 0.01 R/h to 50 R/h
Auto Range Mode
In this mode the meter’s total measuring range is from 0.1 mR/h to 50 R/h.
For efficient measuring purposes, the total range is divided in two narrower ranges that are
automatically switched:
Low Range: 0.1 mR/h to 250 mR/h
High Range: 0.25 R/h to 50 R/h
Switching from low range to high range is performed in a field of 250 mR/h.
Switching from high range to low range is performed in a field of 170 mR/h.
Response time in a field higher than 1 mR/h is 2 seconds

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 8
At the switching point from low range to high range there is a delay of 3 seconds.
When the meter is turned on, the default measuring mode is Auto Range. Switching to High
Range Only is performed by a long press on the MODE push-button.
High Range Only
In this mode the meter’s measuring range is from 0.01 R/h to 50 R/h. The meter resolution is
10 mR/h and there is neither switching between the range modes nor delay time. The meter’s
response time at any measuring range is 2 seconds.
Switching to Auto Range mode is performed by a long press on the MODE push-button.
3.3.3. Measuring Units
When the meter is turned on, the Dose Rate reading is displayed in mR/h or Sv/h units.
A short press on the MODE push-button switches between Dose reading, Dose Rate Pulsed and
then Dose Rate and Dose reading display.
DOSE DOSE RATE pulsed DOSE RATE continuous DOSE
R, Sv mR/h, Sv/h mR/h, Sv/h R, Sv
Measuring range in Dose Rate mode:
Auto Range: 0.1 mR/h to 250 mR/h
0.25 R/h to 50 R/h
High Range Only: 0.01 R/h to 50 R/h
Measuring range in Dose mode:
0.01 Sv/h to 9.99 Sv
1 R to 999 R
To reset the Dose reading, press two long successive pressings on the RESET push-button.
While the Dose reading is displayed, the digital display shows the Dose reading and the analog
display shows the field tendency (Rate reading).
3.3.4. Dose Rate Display
Readings are displayed in digital and analog modes. The bar graph ranges are automatically
changed and the displayed units correspond to both, the digital and analog display. The bar graph
measuring response is quicker than the digital display response since the latter averages the
readings.
3.3.5. Freeze & Reset Functions
Dose Rate mode - A short press on the RESET push-button enters the meter into the FREEZE
mode for peak measuring. In the Freeze mode the measuring units (mR/h, Sv/h) blink on the
display. An additional short press cancels the Freeze mode and performs a momentary reset of
the Dose Rate reading.
The reset function provides a rapid means of discharging the Display reading and enables accurate
measurement of low level Dose Rate.
Dose mode - The first short press on the RESET push-button causes the blinking of the measuring
units, the second short press within 4 seconds resets the dose.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 9
3.3.6. Audible announcements
Each push-button press is accompanied by an audible beep.
In case of threshold alarm or failure alarm, the audible alarm is activated and the SPK icon blinks
on the display. To mute the audible alarms press the RESET push-button.
When no threshold exceeding or failure conditions are present the SPK icon is not displayed.
3.3.7. Display Illumination
A long press on the LIGHT push-button turns the display illumination on/off. If the light is on, it
will turn off automatically after two minutes (option).
3.3.8. Hot Spot Function
When a rapid change in the radiation field is detected, the hot spot function is activated and a
short beep is sounded. The meter’s response time is shorter than one second and the display is
immediately updated.
3.4. Threshold Selection
Note: The threshold value setting process is similar for Dose Rate and for Dose.
A threshold value can be selected from a series of 7 threshold values. The selected one is kept in
the E²EPROM’s memory. If the meter is turned off the selected threshold value does not change.
Dose Rate threshold values:
0.75 mR/h, 2.50 mR/h, 10.0 mR/h, 100 mR/h, 200 mR/h, 0.50 R/h, 50.0 R/h
7.5 Sv/h, 25.0 Sv/h, 100 Sv/h, 1.00 mSv/h, 2.00 mSv/h, 5.00 mSv/h, 500 mSv/h
Dose threshold values:
750 R, 2.50 mR, 10.0 mR, 100 mR, 200 mR, 500 mR, 999 R
7.50 Sv, 25.0 Sv, 100 Sv, 1.00 mSv, 2.00 mSv, 5.00 mSv, 9.99 Sv
To choose the required threshold value, proceed with the following steps:
3.4.1. Enter threshold mode by pressing the MODE and RESET push-buttons simultaneously. The
threshold readings, SET LCDs, RATE LCDs and SPK icon will be displayed.
3.4.2. Each short press on the RESET push-button advances the display to the next threshold
value, according to the order described above.
3.4.3. To exit Set Threshold mode, save and set the new threshold value, press the MODE &
RESET push-buttons simultaneously. Saving will be verified by an audible beep.
3.4.4. The MODE push-button is used to switch between SET DOSE ALARM and SET DOSE
RATE ALARM.
3.5. Alarms
a. Detector alarm
The Err. LCDs and SPK icon will blink on the display in three cases:
1. Electrometer circuit is defective.
2. High voltage power supply is defective.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 10
3. Ion chamber is defective.
To mute the audible alarm, press the RESET push-button.
b. Battery alarm
If battery voltage decreases below 2.2V, the battery and SPK icons will blink on the display,
and an interrupted audible alarm will be activated.
To mute the audible alarm, press the RESET push-button.
If a low battery alarm is activated while the meter is on, it will continue the operation during at
least eight additional hours.
c. Overflow alarm
If the displayed DOSE RATE is over 50 R/h, the O.F. LCDs and SPK icon will blink on the
display and an interrupted audible alarm will be activated. To mute the audible alarm, press
RESET push-button.
d. Threshold alarm for Dose Rate and Dose
If the Dose Rate reading exceeds threshold value, the DOSE RATE LCDs and SPK icon will blink
on the display, and an audible alarm will be activated.
Pressing the RESET push-button mutes the audible alarm, but the RATE LCDs and the SPK icon
continue blinking, until the reading decreases to 75% of threshold value. In case the reading
exceeds threshold value and then decreases to below 75% of the threshold value, the RATE LCDs,
the SPK icon and the beep sound will automatically cancel, even though the RESET push-button
has not been pressed.
If the DOSE reading exceeds dose threshold value, the DOSE LCDs and SPK icon will blink on
the display, accompanied by an audible alarm.
Pressing the RESET push-button mutes the audible alarm but the DOSE LCDs and SPK icon
continue blinking on the display.
The exceeding threshold message in the dose mode will be cancelled only after dose reading
reset.
The meter alarms dose threshold exceeding also in the rate measuring mode.
The meter alarms rate threshold exceeding also in the dose measuring mode.
3.6. Gamma and Beta Radiation Measurement
The meter can measure gamma and beta & gamma radiation fields.
In case of the beta cover is on the Ion chamber, the meter measures gamma radiation.
When the beta cover is off the Ion chamber, the meter measures beta & gamma radiation.
Decreasing the gamma reading from the beta & gamma reading gives the beta radiation reading.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 11
3.7. Data Storage in the Internal Memory
a) A short press on the STORE push-button enables to store data records in the built-in
NV SRAM. When data is stored, the number of available memory entries is displayed
by three digits and the msegment (e.g. 345 m). Maximum memory space is 380
Memory record.
The stored data includes:
- ID number (up-to 12 characters)
- Date (month, day, year)
- Time (hour, minutes)
- Measurement
- Unit
- Comments
b) A long press (for 2 sec.) on the LIGHT push-button turns the light on/off.
c) To transfer the saved records from the RAM ION meter to the PC, the supplied cable
should be used. The RMV software in the PC are used to receive the meter's data.
RAM ION communication protocol is adequate to RMV software.
d) The stored data in the meter’s memory is cleared in two way:
After it is transferred to the PC.
Two sequential long pressings (for 10 sec.) on the B.CODE push-button.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 12
3.8. Push-buttons Function
Definitions:
Short press - Press a push-button and release within 2 seconds.
Long press - Press a push-button and hold at least for 2 seconds
Each press is accompanied by an audible beep.
Function
Pressing
mode
Push-buttons
Meter on/off .Display 0.0 uSv/h and SET
during calculate offset (about 40sec)
Short
ON/OFF
Switch between dose and rate measuring units.
Switch between dose (0.00 uSv) to dose rate
(0.00 uSv/h & DOSE RATE) to rate (0.0
uSv/h)
Short
MODE
Switch between Auto Range and High Range
Only. Switch between high gain and low gain.
high gain(uSv, uSv/h, uSv/h), low gain (uSv u
blink, mSv/h, mSv/h)
Long
MODE
In case of an alarm condition (threshold or
malfunction) the beeper is activated. Pressing
the RESET push-button turns the beeper off.
In Dose Rate mode, the first press enters to the
Freeze mode, the second press returns to Dose
Rate mode and resets the reading.
In DOSE mode the first press on the RESET
push-button causes the blinking of the
measuring units, the second press within 4
seconds resets the dose.
Short
B.CODE
RESET
Stores the reading value.
Displays the available memory space.
Short
STORE
LIGHT
Displays back light illumination on/off.
Long
STORE
LIGHT
Switching between measurement mode and
Threshold Set mode.
Simultaneously
MODE & RESET
Selects threshold value.
In case of alarm mutes the speaker.
First press go to freeze and enable set to zero
dose and rate. (uSv, uSv/h, uSv/h and F blink)
Short
RESET

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 13
Second press within 10 secs after first press
(while the measurement is blinking) sets the
dose rate to zero and cancels the freeze mode.
To Exit from Freeze, mode click with a short
press on
FREEZE during
freeze mode press short reset exit from freeze
Clear data from the meter’s internal memory.
(About 10 sec) first press display space memory
available.
Second press clear space memory to 346
maximum record.
Two sequential
long presses
(10 sec)
B.CODE
RESET

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 14
3.9. Batteries Replacement
3.9.1. Open the batteries compartment by inserting a coin in the cover slot and turning counter
clockwise
3.9.2. Insert two 1.5V C-type cells into the batteries compartment. Ensure to insert the (+) polarity
towards the cover direction.
3.10. Silica Gel Cartridge
If the silica gels color changes from blue to pink which means that the hygroscopic material is
saturated and cannot absorb more humidity), replace it with new material (blue color).
Blue –Silica Gel is dry and good.
Pink –Silica Gel is wet and should be dried or
replaced.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 15
4. Communication
4.1. General
The RAM ION DigiLog Meters include two communication channels:
COMM-1 –D-type connector, 9 pin
COMM-2 –internal Molex connector
COMM-1 is used for:
-Communication between meter and built-in bar code reader (internal connection).
-Communication between meter and PC, to download records from the meter to
SMARTS or RMV software on PC.
-Communication between meter and PC to perform computerized calibration to the
meter using RMC software.
COMM-2 is used for:
-Communication between meter and WRM2 wireless transmitter
-Communication between meter and WRM transmitter to integrate with the data
acquisition system WRM.
Hardware Communication Cable
DB - 9 Male
DB - 9 Female
3
2
7
9
1
6
2
3
5
Tx
Rx
GND
D-type 9-Pin
Female on Meter
3
2
7
9
1
6
Tx
Rx
GND
PC connection
acknowledge
COMM - 1
PC connection
acknowledge

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 16
5. RAM ION-X
5.1. General Description
The RAM ION X is similar to the basic RAM ION meter but differs only in the EPROM software.
The RAM ION X meter has been designed to measure the scattered leakage radiation of X-ray
machines.
The RAM ION X meter is the best solution for routine checks of gamma and X-ray radiation, in
facilities like nuclear medicine radiotherapy, radiochemistry, radiography, research centers and
other health physics applications.
In the Dose mode the meter can measure narrow radiation pulses (50 Nano sec. minimum). Two
optional measuring ranges are available in the Dose mode:
a. Measuring Dose in a Low Range radiation field from 1 Sv/h to 2.5 mSv/h
(0.1 mR/h to 250 mR/h).
b. Measuring Dose in a High Range from 0.0 mSv/h to 500 mSv/h (0.01 to 50 R/h)
5.2. Basic Modes
Offset Adjustment –is performed during the first 40 seconds each time the meter is turned on
(the same as the basic RAM ION).
Measuring Dose in Low Range Radiation Field –The meter enters this mode after offset
adjustment. Dose is measured from 0.01 Sv (1 R) in condition that the radiation field ranges
from 0.1 mR/h to 250 mR/h.
To reset Dose measuring and starting a new count perform by a long press (2 sec.) on the RESET
push-button. If the radiation field is higher than 250 mR/h, the meter will alarm overflow, the
O.F LCDs, the RATE segment will blink on the display and an audible alarm is activated. A short
press on the RESET push-button mutes the audible alarm. If the radiation field decreases below
250 mR/h, the audible alarm will be automatically stopped (even if the RESET push-button has
not been pressed). The Dose measured reading and the O.F. & RATE segments will be displayed
alternately. This result indicates that the count reading is not accurate since the meter has been in
a radiation field higher than the meter range. A short press on the RESET push-button cancels the
O.F. & RATE segments and resets the Dose value.
A short press on the MODE push-button switches the meter to measure Dose in High Range
radiation field mode.
A long press on the MODE push-button switches the meter to measure Dose Rate in Auto Range
mode.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 17
Measuring Dose in High Range Radiation Field –Dose is measured from 0.01 Sv (1 R)
in condition that the radiation field ranges from 0.01 R/h to 50 R/h. In this mode the units Sv
(R) blink on the display.
To reset Dose measuring and starting a new count perform by a long press (2 sec.) on the RESET
push-button. If the radiation field is higher than 50 R/h, the meter will alarm overflow, the O.F
LCDs, the RATE segment will blink on the display and an audible alarm is activated. A short
press on the RESET push-button mutes the audible alarm. If the radiation field decreases below
50 R/h, the audible alarm will be automatically stopped (even if the RESET push-button has not
been pressed). The Dose measured reading and the O.F. & RATE segments will be displayed
alternately. This result indicates that the count reading is not accurate since the meter has been in
a radiation field higher than the meter range. A short press on the RESET push-button cancels the
O.F. & RATE segments and resets the Dose value.
A short press on the MODE push-button switches the meter to measure Dose in Low Range
radiation field mode.
A long press on the MODE push-button switches the meter to measure Dose Rate in High Range
Only mode.
Measuring Dose Rate in Auto Range - is manually performed by a short press on the MODE
push-button in the dose rate high range mode, or by a long press on the MODE push-button in the
dose high range mode. All the other functions are the same as in the basic RAM ION.
Measuring Dose Rate in High Range Only (R/h) –is automatically performed when in the Auto
range the reading exceeds 250 mR/h (2.5 mS/h), or manually performed by a long press on the
MODE push-button in the dose rate low range mode. All the other functions are the same as in
the basic RAM ION.
Reading:
* In Dose measuring in High Range Rate the units icons blink.
Short press on MODE push-button.
Long press on MODE push-button.
Dose
in
Low Range Rate
Dose
in
High Range Rate *
Dose Rate
High Range Only
0.00 R/h 50 R/h
Dose Rate
Auto Range
0.0 mR/h 50 R/h
Offset
1
1
2
2
On / Off
1
2

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 18
6. ICRP-51
The RAM ION ICRP-51 meets the ICRP 51 publication recommendation for ambient dose
equivalent H*(10).

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 19
7. Calibration Instructions
7.1. Electronic Calibration (Perform in an electronic lab by authorized engineer)
7.1.1. Unscrew the three Philips screws located around the cylindrical part of the
plastic mould electronic housing.
7.1.2. Disassemble RAM ION electronic housing.
7.1.3. Disconnect JMP1 on the electrometer board and connect a reference voltage of -
20 Volts between R10 (JMP1 side) and common (GND).
7.1.4. Turn the RAM ION on.
7.1.5. Adjust the output frequency on U2/1 (R13) by TR11 to obtain 81.0 KHz.
7.1.6. Disconnect the reference power supply (-20.00 Volts) and check that the output
frequency is within 500 150Hz. If this result is not obtained, replace the board.
7.2. Manual Radiation Calibration
7.2.1. Place the RAM ION is a homogenous gamma radiation field of about 200 mR/h
(2.00mSv/h), at a distance of at least one meter from the source. The meter should
be in the auto range, the default mode when turning on.
7.2.2. Verify the meter's reading fits the radiation field.
7.2.3. In case the meter's reading differs more than 5% from the true radiation field,
adjust TR11 to obtain the required reading, each clockwise full turn increases the
reading by 1.5%. TR11 can be accessible by unscrewing the silica-gel cartridge.
7.2.4. Check the linearity response.
ROTEM labs checked RAM ION linearity response in the following radiation levels:
2.6 mR/h (26 Sv/h)
25 mR/h (250 Sv/h)
218.2 mR/h (2182 Sv/h)
282.4 mR/h 2.824 (mSv/h) - Calibration point
2.325 R/h (23.25 mS/h)
46.21 R/h (462.1 mSv/h)
50 R/h (500 mSv/h) - Overload check
500 R/h (5 Sv/h) - Overload check
The above radiation levels are only typical values. The exact values are determined
according to the precise source radiation level.
For acquiring the precise values, please check the specific calibration certificate attached
to each RAM ION instrument.

RAM ION DigiLog Meters / Operating & Maintenance Manual Page 20
7.3. Computerized calibration ROTEM Meter Calibration –RMC
7.3.1. General Description
The computerized calibration program enables to calibrate the ROTEM Meter with a very
efficient and easy process, via RS-232 communication.
The ROTEM Meters using the RMC software are: RAM ION, RAM ION DigiLog,
TelePole HR, TelePole WR, TelePole Internal Detector.
Calibration parameters stored in the meter's EEPROM memory:
- Meter serial number (up to 8 characters)
- Calibration factor
- Name of the operator (up to 12 characters)
- Calibration date
- Calibration due date
Parameters transferred to the SMARTS (Survey Mapping Automatic Radiation Tracking
System) software and RMV (ROTEM Meter View) software:
- Meter serial number
- Name of the operator (up to 12 characters)
- Calibration factor
- Calibration due date
7.3.2. Installation Instructions
The calibration software is operated under MS-Windows 95 or later versions.
a. Insert the installation diskette in the floppy drive.
b. Run the install.bat file. The RMC directory will be created.
c. Create an icon for the RMC.EXE file in the Program Manager.
7.3.3. Operation Instructions
Run the calibration program via the RMC.EXE file (or icon).
Enter Login name - up to 12 characters
Enter Password - ram in small letters.
7.3.4. Click OK, the program enters the main window.
The main window displays the previous template. In the displayed template the operator
executes the required missions to complete calibration and linearity.