Fluke 190I User Manual

Victoreen® 190I

Survey Meter

March 2005
Manual No. 191001 Rev. 2
©2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies

Operators Manual

Fluke Biomedical

Radiation Management Services

6045 Cochran Road
Cleveland, Ohio 44139

440.498.2564

www.flukebiomedical.com/rms

Table of Contents

Section 1: Introduction................................................................................................ 1-1

1.1 Product Description ..................................................................................... 1-1

1.2 Specifications............................................................................................... 1-2

1.3 Receiving Inspection.................................................................................... 1-4

1.4 Storage ........................................................................................................ 1-4

1.5 Battery Installation/Replacement ................................................................. 1-5

1.6 Power........................................................................................................... 1-5

1.7 Readout ....................................................................................................... 1-6

1.8 Internal Controls .......................................................................................... 1-6

1.9 External Controls ......................................................................................... 1-8

1.10 Operational Checkout .................................................................................. 1-9

1.11 Warnings and Cautions.............................................................................. 1-11

Section 2: Operation.................................................................................................... 2-1

2.1 Operation ..................................................................................................... 2-1

2.2 Changing the Display Mode (Rate/Integ)..................................................... 2-2

2.3 Logging Displayed Data (Log) ..................................................................... 2-2

2.4 Remote Communication (Optional).............................................................. 2-3

Section 3: Theory of Operation................................................................................... 3-1

3.1 General Circuit Description .......................................................................... 3-1

3.2 Operational Considerations and Applications .............................................. 3-1

Section 4: Maintenance, Troubleshooting, and Calibration..................................... 4-1

4.1 Maintenance and Troubleshooting............................................................... 4-1

4.2 Recommended Spare Parts......................................................................... 4-2

4.3 Calibration.................................................................................................... 4-2

Appendix A: Applicable Drawings and Bill of Materials ............................................... A-1

A.1 Applicable Drawings ....................................................................................A-1

A.2 Applicable Bill of Materials ........................................................................... A-1

i

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Introduction

Product Description

1

Section 1

Introduction

1.1 Product Description

The 190I is a portable, battery-operated general-purpose survey meter for use with an internal Geiger­Mueller (GM) radiation detector. The design combines CMOS microprocessor technology, automatic
range changing, and a Liquid Crystal Display (LCD) into an easy to use instrument.

The 190I is housed in a lightweight, plastic case designed for portability and durability. Measurement
results are indicated on the front panel LCD. The display includes:

• A 51 element analog bar graph near the top of the display to provide real time response.

• A scale multiplier, located below the bargraph relates the analog bargraph full scale to the units

displayed.

• Detector range bargraph consisting of five horizontal bars that indicate the quantity of the dynamic

range of the detector in use.

• A 16 character alphanumeric display that (1) provides a digitized average of the bargraph value or

integrated reading with elapsed time, and (2) displays operational information (e.g., such as
response time changes or changes in the units of the display).

• A backlight, activated by either of two front panel switches, that provides for operation in dark

environments.

The analog bargraph emulates an analog meter movement and is especially useful in survey applications.
The digitized value is intended for quantitative analysis and data logging applications where an
interpretation of the average reading of the analog bargraph is required.

The following controls are available from the front panel:

• Light (2) activates the LCD backlight.

• Mode changes the display units.

• Log, if activated, logs currently displayed data or changes current location identifier, depending on

the currently active logging mode (i.e., timed or manual logging).

NOTE

The optional Infrared Communicator, 190I-1A, is
required to activate the Log function.

• Rate/Integ toggles the alphanumeric display between the digitized rate value and the integrate

value.

• Resp Time changes the response time on the first range or resets the integrate value and elapsed

time (if pressed and held for three seconds).

• Audio toggles the click output associated with counting events in the detector on/off and

acknowledges alarms.

• On/Off turns instrument power on/off when permitted by the microprocessor (i.e., when Logging is inactive or

all logged data has been uploaded to a computer).

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Operators Manual

The four (4) batteries are housed in a separate compartment accessed from the instrument back panel. All four
9-V alkaline batteries are required to operate the unit for approximately 200 hours. Visual and audible low
battery indications are provided whenever battery power is low (four-minute intervals for the audible and
continuous for the visual after a battery test).

CAUTION

To avoid possible damage to the instrument, all
four batteries must be in place.

Communication with the 190I is accomplished through an optional infrared two-way adapter, Victoreen
190I-1A, which mounts at the top of the instrument. The adapter provides positive keying with the
instrument for stable connection and communication.

1.2 Specifications

Radiation Detected Alpha, Beta, Gamma, or X-Ray depending on detector used

Operating Range Rate Mode:

CPM: 0-100; 0-1000; 0-10,000; 0-100,000; 0-1,000,000, and 0­10,000,000

CPS: 0-1, 0-10, 0-100, 0-1000, 0-10,000, 0-100,000, and 0-166,666

2

μR/hr, mR/hr, R/hr, μSv/hr, mSv/hr, Gy/hr, & Bq/cm

conversion factor of the probe used.
Integrate Mode:
Counts: 0-100,000,000; displayed as 4 digits up to 9999 counts, 3 digits

plus a K (for thousand) or an M (for Million) at higher counts.
Seconds: 0-65535; displayed as 4 digits up to 9999 seconds, 3 digits in

minutes and tenths of minutes above 9999 seconds.
μR, mR, R, cts, μSV, & mSv: depends on conversion factor of the probe

used.

: depends on

Accuracy Within 10% of reading between 10% and 100% of full-scale indication on

any range, exclusive of energy response.

Ranges Six (6) decades are available for calibration; the number of usable

decades is detector dependent.

Deadtime Correction Provided above 1000 CPM

Jam Detection Adjustable level for determining jam condition; provided in probe adapter

modules.

Alarm Can be set on any decade at 10% to 100% (in increments of 10%) of full
scale.

Detector Internal Geiger-Mueller Tube

Warm-up Time 15 seconds (diagnostic testing)

Response Time (Bargraph) Selectable; 24, 12, 6, and 3 seconds.

24-second response time selected:
Scale
1 0-100 24.0
2 0-1000 12.0
3 0-10K 3.0

Range (CPM) Response (seconds)

1-2

Introduction

Specifications

4 0-100K 1.5
5 0-1M 1.5

6 0-10M 0.7

12-secondresponse time selected:

1

Scale
1 0-100 12.0
2 0-1000 6.0
3 0-10K 3.0
4 0-100K 1.5
5 0-1M 1.5
6 0-10M 0.7

6-second response time selected:

Scale
1 0-100 6.0
2 0-1000 3.0
3 0-10K 1.5
4 0-100K 1.5
5 0-1M 0.7
6 0-10M 0.7

3-second response time selected:

Scale
1 0-100 3.0
2 0-1000 1.5
3 0-10K 0.7
4 0-100K 0.7
5 0-1M 0.7
6 0-10M 0.7

Range (CPM) Response (seconds)

Range (CPM) Response (seconds)

Range (CPM) Response (seconds)

Front Panel Controls Eight push-button switches:
LIGHT (2): either activates the LCD backlight;
MODE: changes the display units;
LOG: stores currently displayed data or changes current location

identifier, depending on the currently active logging mode;
RATE/INTEG: toggles the alphanumeric display between the digitized

rate value and the integrate value;
RESP TIME: changes the response time on the first range or resets the

integrate value and elapsed time;
AUDIO: toggles the click output associated with counting events in the

detector, turns Audio on/off, and acknowledges alarm conditions;
ON/OFF: turns instrument power on/off when permitted by the

microprocessor (i.e., when data logging is inactive or all logged data has

been read by a PC).

Internal Controls Main unit: LCD contrast adjustment and +5 V Power Supply

Environmental Effects Operating temperature range:

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Operators Manual

14°F to 140°F (-10°C to 60°C) with alkaline batteries
Relative humidity range:
0 to 95% non-condensing
Temperature dependence:
Less than 5% of full scale change in the reading when the operating

temperature is in the 20°C to 50°C range.

Batteries Four 9 V batteries installed provide up to 200 hours of continuous
operation.

Readout Backlit liquid crystal display includes:

• 51 element analog bar graph display

• Scale multiplier indication

• 16 character alphanumeric display

• Detector range bargraph

Construction Molded plastic case

Dimensions 9.0 x 3.6 x 2.0 in (23 x 9.2 x 5.0 cm)

Weight 1 lb 10 oz (740 grams) with four batteries installed

Options Communicator: P/N 190I-1A

1.3 Receiving Inspection

Upon receipt of the package:

1. Inspect the cartons (s) and contents for damage. If damage is evident, file a claim with the carrier
and notify Fluke Biomedical, Radiation Management Services at 440.248.9300.

2. Remove the contents from the packing material.

3. Verify that all items listed on the packing list have been received and are in good order.

NOTE

If any of the listed items are missing or damaged,
notify Fluke Biomedical.

1.4 Storage

If the unit is to be stored prior to use, pack it in the original container if possible, and store in an
environment free of corrosive materials, fluctuations in temperature, and humidity, and vibration and
shock.

1-4

Introduction

Battery Installation/Replacement

1.5 Battery Installation/Replacement

Four 9 V batteries are supplied with the 190I. The battery compartment is located on the back of the
instrument. The compartment will hold up to four batteries but only one battery is necessary to operate
the instrument. Use the following procedure to install/replace the batteries:

To prevent battery leads from shorting on the
battery compartment's conductive coating, ensure
that all four batteries are INSTALLED at all times.

Unit power must be left ON and batteries replaced
one at a time to prevent data loss when the log
mode is activated and logged data is to be
retrieved.

1. Loosen the two-quarter turn fasteners securing the battery compartment cover to the back panel.

2. Remove the battery compartment cover to gain access to the batteries.

3. Replace the batteries one at a time, observing proper polarity.

CAUTION

1

The unit may make beeping sounds while inserting
the batteries.

4. Replace the battery compartment cover, securing it with the two-quarter turn fasteners.

NOTE

1.6 Power

The 190I is powered using four 9 V batteries. The batteries (four) are housed in a separate compartment
accessed from the instrument back panel. All four 9 V batteries are required to operate the unit for
approximately 200 hours. Visual and audible low battery indications are provided whenever battery power
is low (four minute intervals for the audible and continuous for the visual after a battery test).

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1.7 Readout

Measurement results are indicated on the front panel LCD. The display includes an analog bargraph,
scale multiplier, detector range bargraph, and a 16 character alphanumeric display (refer to Figure 1-2).

Each of the 51 elements in the bargraph represents 2% of the scale span. The analog bar graph is
divided into five sections with scale notations of 0, 2, 4, 6, 8, and 10. The scale sections are marked by
longer bars. The bars are arranged in an arc with a radius of 3.75 inches (9.5 cm). Scale length is 2
inches (5 cm).

The 51 element analog bargraph, located near the top of the display, provides real time response. It is
designed to emulate an analog meter movement, making it especially useful in survey applications. The
16 character alphanumeric display at the bottom of the LCD displays units, an average digitized value of
the reading, error messages, integrated value (with elapsed time), operational parameters (e.g., response
time), low battery indication, probe type and serial number, and data logging information.

The scale multiplier, located below the bargraph, relates the display units to the displayed bargraph value.

The detector range bargraph consists of five horizontal bars that indicate the decade of the dynamic
range in cpm of the detector in use. Most detectors will cover a dynamic counting range of five decades.
A few detectors (e.g., those with short dead times) can reach the sixth decade of operation. The sixth
decade is indicated by all five bars being lit.

The bargraph may be disabled using the 190I-1A
Communicator.

In the Alarm condition, the entire display blinks on and off with a period of two seconds.

NOTE

1.8 Internal Controls

An electrical shock hazard exists between the high
voltage supply and ground.

WARNING

1-6

Introduction

Internal Controls

CAUTION

Use extreme care and ensure that you are properly
grounded prior to opening the unit for voltage
adjustments. Failure to comply could destroy the
instrument.

Display Contrast Adjustment (RP1)

The 190I display is designed for optimum viewing at approximately 60° from the plane of the display and
directed toward the bottom of the instrument. The Display Contrast Adjustment (RP1) is factory set for
optimum viewing and it is not recommended that it be further adjusted. However, if the display contrast
requires adjustment, turn RP1 to vary the angle of maximum contrast of the 16-character display. The
contrast for the upper part of the display is fixed. Refer to Figure 1-1 for RP1 location.

Figure 1-1. RP1 Location

Display Contrast Adjustment (RP1)

+5 V Adjustment (RP2)

1

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Voltage Adjustment (RP2)

A +5 volt adjustment is provided on the main circuit board. Refer to Figure 1-2 for adjustment location.
Use the following procedure:

1. Connect the - lead of a DVM to the groundside of R18.

2. Connect the + lead of the DVM to Z10-12.

3. Adjust RP2 for 5.00 V ± 0.02 V.

Figure 1-2. 190I Display

1.9 External Controls

The 190I has eight external front panel pushbutton controls. The front panel controls include four
functional buttons and four operational buttons. The functional buttons include including Mode, Log,
Rate/Integ, and Resp Time, effect the daily operation of the unit and are discussed in detail in Section 2, ­Operation.

The four operational pushbuttons and their functions are:

• Light (2) activates the LCD backlight

• Audio toggles the click output on/off and acknowledges an alarm condition

The click output is associated with counting events in the detector.

• On/Off toggles instrument power on/off when allowed by the microprocessor.

The four functional pushbuttons are as follows:

• Mode changes the display units.

• Log, when pushed momentarily, logs currently displayed data or changes current location identifier,

depending on the currently active logging mode; when pressed and held for three seconds, and a
logging with locations mode is active, Log changes the label.

• Rate/Integ toggles the alphanumeric display between the digitized rate value and the integrate

value.

• Resp Time changes the response time on the first range or resets the integrate value and time.

NOTE

1-8

Operational Checkout

1.10 Operational Checkout

1. Install the batteries as outlined in Section 1.5, Battery Installation/Replacement.

2. Turn the instrument on by pressing the ON/OFF button on the front panel.

3. Observe the following:

a. All segments of the display should come on for approximately one second.

If the display does not come on at all, replace the
batteries and try again. If a partial display is visible,
contact Fluke Biomedical for further Instructions.

b. The display will blank and display the version number of the software in the alphanumeric

display.

c. The unit will read the internal EEPROM and display the Probe Model Number and Serial

Number, or a portion of it.

In the event that the internal EEPROM was not
properly read, an error message will be displayed
(i.e., "INT EEPROM FAIL"). Contact Fluke
Biomedical for further Instructions.

d. The instrument will then begin to operate in the selected mode.

The Instrument is factory set with all buttons
operational and the CPM and mR/H modes
selected. (The Log Mode is inactive.)

4. Test each button of the instrument, as follows:

a. Press each LIGHT button to cause the display backlight to turn on. (The backlight may not

show up in a bright environment.)

b. Press the MODE button to toggle the available display modes that were enabled during

calibration. The current mode will be displayed briefly on the 16-character alphanumeric
display. An example:

• COUNTS/MIN MODE

• COUNTS/SEC MODE

• mR/H MODE

NOTE

NOTE

NOTE

Introduction

1

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Operators Manual

NOTE

When the Instrument is shipped, it has been
initialized and calibrated at the factory. The CPM,
CPS, mR/hr, or Sv/hr modes are the only modes
available.

c. Press the LOG button to log displayed data. If the Log Mode has been activated, the following

should appear in the alphanumeric display:

LOGGING DATA

If the Log Mode has not been activated, the following message will be displayed:

NOT IN LOG MODE

The Log Mode can only be activated using the optional Communicator, Victoreen 190I-1A.

Refer to the Instruction Manual supplied with the Communicator for details.

d. Press the RATE/INTEG button to toggle the alphanumeric display between the Rate Mode and

the Integrate Mode.

e. Press the RESP TIME button to toggle the available response time selections. The new

selection is displayed in the alphanumeric display as follows:

RESPONSE IS XX S

where XX is the currently active first scale response time.

NOTE

If the instrument is in the Integrate Mode, press
and hold the RESP TIME button for three
seconds. The Integrate values should reset
to zero without changing the response time.

f. Press the AUDIO button to toggle on or off the click from the speaker associated with each

count from the detector. The clicks from the speaker have a one to one correspondence with
counts from the detector up to 3200 cpm. For counts above 3200 cpm, there is a transition from
clicks to a steady tone.

g. Press the ON/OFF button to turn the instrument

NOTE

off.

If the instrument is in the Log Mode, the unit can be
turned OFF only after all logged data has been read
from the internal RAM using the communications
software. Refer to the Instruction Manual provided
with the 190I-1A Communicator for further details.

1-10

Introduction

Warnings and Cautions

1

1.11 Warnings and Cautions

An electrical shock hazard exists between the high
voltage supply and ground.

To prevent battery leads from shorting on the
battery compartment's conductive coating, Ensure
that all four batteries are INSTALLED at all times.

Unit power must be left ON and batteries replaced
one at a time to prevent data loss when the log
mode is activated and logged data is to be
retrieved.

The equipment described in this manual is intended to be used for the detection and measurement of
ionizing radiation. It should be used only by persons who have been trained in the proper interpretation of
its readings and the appropriate safety procedures to be followed in the presence of radiation.

WARNING

CAUTION

CAUTION

Although the equipment described in this manual is designed and manufactured in compliance with all
applicable safety standards, certain hazards are inherent in the use of electronic and radiometric
equipment.

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Operation

Operation

2

Section 2

Operation

2.1 Operation

Operation of the 190I consists of:

1. If necessary, battery installation/replacement (as outlined in Section 1.5, Battery
Installation/Replacement).

2. Turning instrument power on by pressing the ON/OFF button. The 190I is ready for operation in the
defined default mode of operation.

3. Setting the response time, selecting display units, and selecting operational mode using the front
panel pushbuttons are outlined in the following paragraphs.

Changing the Response Time (Resp Time)

The 190I response time may be changed by pressing the front panel Resp Time push-button. When Resp
Time is pressed, the next response time will be selected and the following will appear on the
alphanumeric display:

RESPONSE IS XX S

XX is 24, 12, 6, or 3 seconds, corresponding to the newly selected response time.

The Resp Time button may be pressed as necessary to scroll through and select the desired response
time. The Resp Time button may be disabled via the 190I-1A Communicator.

NOTE

The response time displayed is for the lowest
range. Refer to Specifications in Section 1,
Introduction, for corresponding response times
on other ranges.

Resetting the Integrate Value (Resp Time)

If the instrument is in the Integrate Mode and the reset integrator is enabled via the optional 190I-1A
Communicator, the integrate value may be reset by pressing and holding the Resp Time button for three
seconds. The integrate values will reset to zero; the response time will not change. The integrate reset
function may be disabled via the 190I-1A Communicator.

Changing the Operation Mode (Mode)

The 190I factory default Operational Mode is C/MIN. Using the optional 190I-1A Infrared communicator;
default settings can be changed/programmed into the 190I. Features and pushbuttons can also be
locked-out to set up the 190I in a user-defined mode of operation. The Operational Mode may be
changed by pressing the front panel Mode push-button. The next available mode will then be displayed
corresponding to the newly selected Mode. The Mode button may be pressed as necessary to scroll
through and select the desired Mode, and includes the following:

1 . COUNTS/MIN MODE

2. COUNTS/SEC MODE

3. mR/H MODE

4. Sv/H MODE

5. Gy/H MODE

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Operators Manual

NOTE

If the detector has not been initialized and
calibrated (either at the factory or via the optional
infrared communicator), the CPM and CPS modes
are the only modes available.

All but one of the Operational Modes may be disabled via the 190I-1A Communicator; one default mode
must be enabled for the instrument to operate properly.

2.2 Changing the Display Mode (Rate/Integ)

The front panel Rate/lnteg button toggles the alphanumeric display between the digitized rate value and
the integrate value. Press Rate/Integ to automatically change the display mode.

The Rate/lnteg button may be disabled (and the display mode fixed) via the optional 190I-1A
communicator.

2.3 Logging Displayed Data (Log)

If the Data logging function is selected to be operational (via the optional Communicator), currently
displayed data will be stored for future retrieval. The procedure for logging data depends on the Log
Mode (Manual or Timed, with or without location identifiers, as selected via the communicator).

NOTE

The Log Mode is always inactive when the unit is
turned on and data logging can only be activated
through the optional Communicator. If the Log Mode
has not been activated, a NOT IN LOG MODE
message will be displayed when the Log button is
pressed. When in the data logging mode, the
instrument ON/OFF button is in active and the
instrument will stay on until the data has been
retrieved. Refer to the 190003 Instruction Manual
provided with the 190-1A Communicator and
94190C00-200 software for further information and
instructions.

In the manual mode, displayed data is logged by pressing the front panel Log button. The following
message will appear in the alphanumeric display:

Data logging in manual mode. ready

In the timed mode, data is logged at specific intervals. The following message will appear in the
alphanumeric display:

Data logging in timed mode. ready

2-2

Operation

Remote Communication (Optional)

2

2.4 Remote Communication (Optional)

Communication with the 190I and 190 is accomplished via the 190I-1A Communicator that plugs into top
of the instrument.

For remote communication, use the 190-1A
Communicator and the 94190C00-200
software provided.

For additional information and operation of
remote communications, refer to the 190003
instruction manual provided with the 190-1A
Communicator.

NOTE

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Theory of Operation

General Circuit Description

3

Section 3

Theory of Operation

3.1 General Circuit Description

A block diagram of the circuit of the 190I is shown in Figure 3-1. The CMOS microprocessor is a TI 7000
series microprocessor, capable of addressing 64k bytes of memory. A 32k byte PROM contains the
operating program and an 8k byte RAM provides storage for operational and data logging information.
The microprocessor addresses the display via two display drivers. The microprocessor senses the
keypad directly, with the exception of the ON/OFF switch. The communications is direct from the
microprocessor through its ports, light emitting diodes, and photosensitive transistors. The
microprocessor reads and writes to the internal EEPROM and reads count data directly from the GM tube
or from the counter (when the count rates are too high to handle each count individually). Calibration and
operational information is stored in the internal EEPROM.

Communication with the 190I is accomplished through an infrared two-way adapter that mounts at the top
of the instrument. The infrared receiver and transmitter are viewed through two small holes in the upper
edge of the decal covering the LCD.

3.2 Operational Considerations and Applications

Control and Configuration

The 190I uses a database, stored in the EEPROM on the main circuit board, for operation. The EEPROM
is used to define the operating modes through a set of configuration and control codes. These codes may
be user-modified with the optional Communicator (P/N 190-1A) to tailor the instrument for a specific
application. For example, any or all of the front panel buttons may be disabled or the unit may be
configured to operate in only one Display Mode. Refer to the Instruction Manual provided with the
Communicator for further details.

Display Calculations

The 190I retains all data internally as both counts and counts per minute. All other displays are calculated
from these data sets and stored calibration information in the EEPROMS, allowing the operator the
capability to switch back and forth between the various display modes without affecting the database
used for calculations.

The counts per minute mode does not require a
calibration adjustment because its time base is
based on the highly accurate crystal clock of the
microprocessor. All other displayed values (e.g.,
mR/h and Sv/h) can be derived from the counts per
unit time value if a suitable calibration constant is
used.

Above 384,000 CPM, the counts in a-time slot are counted and the value multiplied by the appropriate
factor to determine the actual count rate, which may cause a reduced accuracy specification on the fifth
and sixth scales.

NOTE

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Operators Manual

Figure 3-1. 190I Block Diagram

3-2

Theory of Operation

Operational Considerations and Applications

Deadtime Effects

The deadtime correction is limited to a maximum multiplier of 3.7 above 106 counts per minute (cpm) 5.4
from 10
rates because of increased counting statistics. The display will indicate "OVER RANGE" if the deadtime
correction is greater than the values listed. This typically happens only on scale 6. In the event of an
overrange indication due to the deadtime the bar graph portion of the display continues to function and
may be used to observe increased or decreased radiation even though numerical values are not
displayed. The bargraph displays relative values in this mode.

5

to 106 cpm, and 1.6 from 104 to 105 cpm. Larger correction factors are permitted at higher count

Low Battery Indications

Once every 256 seconds the instrument checks the amount of energy remaining in the batteries. When
the values reach a threshold, the instrument simultaneously displays a LOW BATTERY message and
sounds the sounder for a minimum of one second. The amount of time remaining before the unit stops
operating depends on previous use of the instrument. If the instrument is used for longer continuous
periods of time, there will be a slower decrease in available battery life at the battery end point; if the
instrument is on for shorter periods of time, the battery fails more precipitously at the battery end point.

3

NOTE

The display may prematurely indicate a low battery
if the count rate is high and/or the backlight and/or
Alarm are operational simultaneously.

Response Times

The response times stated in Specifications in Section 1 -Introduction apply to the bargraph display. Since
the digital data is updated only once each second, a filter is used to smooth the readings. There is
approximately two seconds additional response time (10-90% of change) for the digital display.

Range Changing

A hysteresis is built into the range changing of the 190I to prevent excessive range changing near a
range change threshold. In addition, internal readings above 10% of the current full scale are allowed for
one full second prior to down-scaling. Any reading above the current full scale will cause a range change
to the next higher scale.

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Maintenance, Troubleshooting, and Calibration

Operational Considerations and Applications

Section 4

Maintenance, Troubleshooting, and Calibration

An electrical shock hazard exists between the high
voltage supply and ground.

4.1 Maintenance and Troubleshooting

It is recommended that the following maintenance and troubleshooting procedures for the 190I:

WARNING

4

Section 4.2 lists recommended spare parts.
Schematics, assembly drawings, and complete
parts lists are provided in the Appendix A.

1. Battery replacement as outlined in Section 1.5, Battery Installation/Replacement, when LOW BA
TTERY appears in the alphanumeric display and/or the audio low battery indication is activated.

If the LOW BATTERY message remains displayed
after replacing the batteries, contact Fluke
Biomedical for further instructions.

2. If a problem occurs with the printed circuit board, case, or audible alarm transducer, the suspect
part is easily replaceable. Refer to Section 4.2 for a list of Replacement parts.

a. The printed circuit board has all but the PROM, RAM, and the microprocessor soldered into the

board.

b. The case and modules are molded plastic and may require replacement due to contamination.

c. The speaker and its gasket are open to the surface of the instrument, to allow audible

indications to be clearly heard, and may therefore require replacement due to contamination.

3. If the problem is isolated to the probe or module, refer to Section 1 for replacement procedures.

4. If the problem cannot be isolated or corrected using the above procedures, contact Fluke
Biomedical for further instructions.

NOTE

NOTE

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Operators Manual

4.2 Recommended Spare Parts

Part Number Description

190080 Case
190010 Main Circuit Board Assembly
190021 Case Top
190026 Display Window Decal
190027 Membrane Switch Decal
190033 Battery Plate
91-11-1 ¼ Turn Fastener (2)
190031 Case Bottom
190023 Battery Cover
190035 Battery Cover Gasket
46-114 O-Ring
5-7111 Flat Washer (5)
149036 Transducer Screen
67-115 Connector
190015 Keypad Assembly
5-1154 Phillips Screw (5)
5-1153 Phillips Screw
5-1151 Case Screw (8)
5-1152 Screw (2)
16-48 Battery Strap (4)
91-11-2 Retainer for ¼ Turn Fastener (2)
31-82 Housing
36-110 Terminal

4.3 Calibration

Calibration data is stored in the instrument EEPROM. If required, calibration data may be changed using
the optional communicator, P/N 190-1A. Refer to the Instruction Manual supplied with the Communicator
for further instructions and specific procedures for entering calibration data.

4-2

Applicable Drawings and Bill of Materials

Applicable Drawings and Bill of Materials

A.1 Applicable Drawings

Part Number Description

190013 190I Schematic

191005 190I Assembly

191010 Main Circuit Board Assembly

A.2 Applicable Bill of Materials

Document Number Description

Appendix

A

Appendix A

191005 190I Assembly

191010 Main Circuit Board Assembly

A-1

Fluke Biomedical

Radiation Management Services

6045 Cochran Road
Cleveland, Ohio 44139

440.498.2564

www.flukebiomedical.com/rms