Wahl TM612 User manual

TM612 and TM612A
Pocket RTD
Thermometer
User Manual
WD1020 Rev F
04/08/15
TM612
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Acknowledgements
Thank you for choosing this Wahl Instruments high accuracy measuring instrument. Wahl has been providing
high quality, high accuracy measuring instruments for over 50 years.
Because of this, e are able to continue our policy of continuous innovation, hich has served our customers
so ell for the last 50 years. Wahl Instruments encourages your comments and ould illingly accept any
suggestions from you to help us to perfect our kno -ho and improve our future products.
LIMITED UARANTEE
LIMITED LIABILITY
Manufacturer arrants the TM612 and TM612A RTD Digital Thermometer to be free from defects in material or
orkmanship under normal use and service for a period of 12 months from date of purchase. The
Manufacturer agrees to repair or replace any product, hich upon examination is revealed to have been
defective due to faulty orkmanship or material if returned to our factory, transportation charges prepaid,
ithin the above stated arranty period. This arranty is in lieu of all other arranties, expressed or implied
and of all obligations or liabilities on its part for damages including but not limited to consequential damages,
follo ing the use or misuse of instruments sold by the Manufacturer. No agent is authorized to assume for
Manufacturer any liability except as set forth above.

TM612
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Unpacking Contents
The TM612 (all references to the TM612 also include the TM612A unless other ise indicated) as checked
mechanically and electrically prior to shipment. The necessary precautions have been taken to ensure it
reaches the user ithout being damaged.
Nonetheless, it is ise to make a quick check to detect any damage that may have occurred during transport.
If this is the case, inform the carrier immediately thereof.
The standard accessories are the follo ing:
•This users guide
•4 AA batteries (1.5V).
•Wrist strap.
•Rubber boot
If service or re-certification of your instrument is needed, please contact us via phone, fax or e-mail, for a
Return Material Authorization (RMA) number.
If the unit is to be returned, it is preferable to use the original packaging and return ith transportation
charges prepaid.
WARRANTY & CALIBRATION
REGISTRATION at
www.palmerwahl.com/register
Registration is fast and easy. In about a minute you can
have your product automatically registered for Warranty
Protection and our Calibration Reminder service. Let
Palmer Wahl help you protect your investment, and
maintain product accuracy and compliance with ISO and
other quality standards.
Questions? Call Customer Service
at 1-800-421-2853 or 828-658-3131,
Or email: [e-mail]
Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804 USA
Phone: [phone]
828.658.3131
Fax: [phone]
e-mail:rma@palmer ahl.com
ebsite: .palmer ahl.com
TM612
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Contents
A. General ................................................................................................................... 5
A.1 Introduction .......................................................................................................... 5
A.2 Parts ................................................................................................................... 5
A.3 Safety.................................................................................................................. 5
A.3.1 Complianc e ith safety s tandards ........................................................................ 5
A.3.2 Environmental conditions ................................................................................... 6
A.3.3 Worn devices .................................................................................................. 6
A.3.4 Device destruction procedure .............................................................................. 6
A.3.5 Instructions .................................................................................................... 6
A.3.6 Making measurements ...................................................................................... 6
A.3.7 Defects and abnormal stresses ............................................................................ 6
A.3.8 Definitions...................................................................................................... 7
A.4 Maintenance .......................................................................................................... 7
B. Using the instrument .................................................................................................. 8
B.1.1 The keyboard .................................................................................................. 8
B.1.2 The measuring and simulation terminals ................................................................ 9
B.1.3 The USB connector ......................................................................................... 12
B.1.4 The screen ................................................................................................... 12
B.1.5 Getting started (after po er-up) ........................................................................ 13
B.1.6 Main characteristics ........................................................................................ 13
C. Mode Programming .................................................................................................. 14
C.1.1 Resistance or temperature measurement using resistive sensors ................................ 14
D. Related Functions..................................................................................................... 16
D.1 Sc aling............................................................................................................... 16
D.2 Differential measurements ...................................................................................... 17
D.3 Calibrated sensors ................................................................................................ 18
D.4 Storage of acquisitions in progress. ........................................................................... 20
E. Parameter settings ................................................................................................... 27
E.1 Contrast adjustment .............................................................................................. 27
E.2 Date and time setting ............................................................................................ 27
E.3 “Preferences” setting. ............................................................................................ 28
E.3.1 Filtering setting. ............................................................................................ 28
E.3.2 Display resolution setting. ................................................................................ 28
E.3.3 Lighting duration setting. ................................................................................. 28
E.3.4 “Key beeping” setting. ..................................................................................... 28
E.3.5 Language setting ........................................................................................... 28
E.3.6 Temperature unit setting ................................................................................. 29
E.4 “Maintenance” menu ............................................................................................. 29
E.4.1 Adjustment from the Maintenance menu .............................................................. 29
E.5 “About the instrument” menu .................................................................................. 31
F. Soft are Update ...................................................................................................... 32
G. Technical specifications.............................................................................................. 33
G.1 Measurement Function ........................................................................................... 33
G.1.1 Resistance ................................................................................................... 33
G.1.2 Temperature by resistive sensors. ...................................................................... 33

TM612
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A. ENERAL
A.1 Introduction
The TM612 is a portable RTD thermometer (compliant ith EC standards). It is especially designed for
calibration and maintenance. It is used to measure resistance values or temperatures both on site and in the
laboratory.
The TM612 features a large number of related functions hich extend its range of application:
•Storage of acquisitions and display in the form of tables or trend curves.
•Use of calibrated sensors ith their coefficients of correction
A range of improvements facilitates its operation:
•Rapid access to all functions.
•Intuitive user interface.
•160x160 graphic display
•Connection via 4 mm safety plugs or a miniature flat plug.
•Po er supply via 4 AA batteries or rechargeable batteries ith rapid internal charger (Option).
The device is housed in an ABS case ith a rubber boot.
A.2 Parts
General characteristics:
•Portable device po ered by 4 AA batteries (pack of Ni-MH storage batteries, 1.7 Ah optional).
•Hand strap for carrying and use on-site
•Graphic liquid crystal display: 160 x 160 pixels.
•Choice of language used for messages and programming of functions, gauges and parameters via
6-key keyboard + 1 navigator.
•Backlit display accessible via a keyboard key, ith the possibility of automatic black-out after a
specific programmable period of inactivity.
•Appearance: ABS case ( ith rubber boot).
•Dimensions: 6.18 x 3.35 x 1.77 inches (157 x 85 x 45 mm) ( ithout rubber boot).
•Weight: 10.8 oz. (306 g) ithout rubber boot.
•IP54 rating in compliance ith standard EN 60529
Accessories:
Part No.
Name
12436-01 Rechargeable battery pack ith charger
12436
-
04
4 pin RTD connector (
mating plug)
for TM612 and TM630
(and TC622)
12436
-
05
Carrying Case, hard plastic
12436
-
06
Rubber
boot (replace
ment)
12436
-
07
Cable, USB 2.0A to Mini USB Type B, 5 pin, 6 ft. length
12436
-
32
4 pin RTD connector (
mating plug) for TM612A and TM630A
(and TC622A)
A.3 Safety
A.3.1 Compliance with safety standards
The device complies ith the applicable standards in force on the subject of electrical safety (EN 61010) as
ell as on the electromagnetic compatibility of the electrical measuring instruments (EMC: EN61326).
These instructions for use contain information and arnings hich must be observed by the user to protect
the latter against the dangers of electricity, to ensure the safe operation of the device and to protect it against
any mis handling hich could damage or compromise the safety of use of the device.
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A.3.2 Environmental conditions
In accordance ith publication CEI 359: operating category I.
Range of application of standards from 0 to 2,200 m.
Reference temperature range: 23°C ± 5°C, relative humidity: 45 % to 75 %.
Nominal operating range: -10°C to +50°C, relative humidity: 20 % to 80 % non-condensing.
Operating range limit: -15°C to +55°C, relative humidity: 10 % to 80 % (70 % at 55°C).
Storage and transport temperature range limit: - 30°C to + 60°C ( ithout the batteries).
A.3.3 Worn devices
Worn electrical devices can pollute the environment. We recommend you refrain from disposing of this device
in an ordinary aste bin, but rather that you use the recycling circuits available locally.
A.3.4 Device destruction procedure
Opening the device: unscre the scre on the battery compartment, follo ed by the 5 scre s securing the 2
shells.
Separate the 2 shells. Separate the PCB from the upper shell.
With regard to the batteries, you ill find them in the battery compartment (see commissioning chapter).
In the case of the pack of batteries, there are 2 contaminants: NI-MH (Nickel-Metal Hydride) batteries and a
PCB. Separate these 2 items.
A.3.5 Instructions
The device as designed to operate safely if the instructions provided in the accompanying documents are
follo ed. Any other use may jeopardize the safety of the operator. Any use other than those specified in the
instructions is therefore dangerous and forbidden.
A.3.6 Making measurements
The measuring leads and ires must be in good condition and must be replaced if their insulation appears
faulty (insulating material cut, burned, etc).
Never exceed the protection value limits indicated in the specific ations.
Before changing function, disconnect the measuring ires from the external circuit. When voltage
measurements are being made, even eak ones, keep in mind that the circuits may contain a dangerous
voltage for the operator hen referenced to ground.
Do not make any measurements hen the device is linked up to another device using the USB link or hen
the batteries are being charged.
A.3.7 Defects and abnormal stresses
If you believe the device’s protection may have been compromised, s itch off the device and prevent it from
being s itched back on unexpectedly.
The protection may be impaired in the follo ing cases, for example:
The device is visibly orn.
The device is no longer able to make precise measurements.
The device as stored in unfavorable conditions.
The device has undergone severe stresses during transport.

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A.3.8 Definitions
A.3.8.1 Definition of the category and degree of pollution
CAT II 60V:
This notion of categories determines the maximum voltage hich can be applied to the measuring inputs (it is
also referred to as the over voltage category). For the TM612, the ceiling over voltage is (DC or AC)
POL 2°:
The notion of pollution determines the clearance bet een circuits. Degree 2 authorizes temporary conductivity
caused by condensation.
A.3.8.2 Table of symbols used
Symbol
Name
Attention: see the accompanying documents
Earth
Compliant ith the European Union directives
60V
CAT II Pol 2
Category II, Pollut ion 2.
Maximum common mode voltage compared ith the ground=60V
A.4 Maintenance
The device must al ays be repositioned in accordance ith the instructions provided herein. Any incomplete or
incorrect assembly could compromise the safety of the operator.
The authority responsible must regularly ensure that all safety-related items are not orn and ensure all the
preventive maintenance operations required are performed.
Before opening the device for any maintenance operations, you must make sure that all the ires are
disconnected from the appliance.
All adjustments, maintenance and repair ork on the open device must be avoided as much as possible and,
hen these are indispensable, they must be performed by qualified staff, ho are ell a are of the risks
involved.
TM612
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B. USIN THE INSTRUMENT
In order to use the devic e in a safe manner, all operators must read the paragraph on safety carefully, along
ith the paragraph belo .
B.1 Power-up
The device is delivered ith 4 AA batteries of 1.5V each. To install the batteries into the compartment,
unscre the scre on the back of the unit. Once the batteries are in place, scre the cover back on.
Observe the polarity: an incorrect battery positioning could damage the device. The correct polarity is
indicated inside the compartment. The figure belo illustrates ho to open the battery compartment as ell as
the correct positioning of each battery.
To turn the unit ON, press the ON/OFF key until the first “Checking EEPROM” screen comes up. (This may
require pressing and holding the key for up to 5 seconds.)
To turn the unit OFF, press the ON/OFF key until the “Instrument in po er off mode” screen comes up. Please
note: instruments, hose serial number ends in “B”, ill not retain the time and date hen po ered off. If
time and date need to be retained, the unit can be put in standby mode.
To enter standby mode, press both the HOLD and ON/OFF buttons until the screen displays “Instrument in
standby mode”.
To return to normal operating mode from standby mode, press the ON/OFF key until the original screen comes
up. Please allo a minimum of 10 seconds bet een going into standby mode and returning from it.
B.1.1 The keyboard
The keyboard features:
•2 function keys (F1 and F2) for the selection of the various menus displayed on the screen.
•The navigator, consisting of 4 arro s (up (↑
↑↑
↑), do n (↓
↓↓
↓), right (→
→→
→), left (←
←←
←).
•A clear key (CLEAR).
•A device on/off and backlighting on/off key (ON/OFF).
Press briefly to start the device. During operation, press briefly to turn the backlight on or off.
Press it longer for 2 seconds to turn off the device.
•A validation key (VAL).
•A HOLD key allo s you to suspend a process temporarily ( hen pressed briefly). If you press it
longer, this key makes it possible to s itch from measuring mode to emission mode and vice-
versa.
Battery
compartment screw

TM612
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B.1.2 The measuring and simulation terminals
The TM612 is fitted ith 4 safety banana jacks (4 mm in diameter) and a 4-pin circular connector. These
connector assemblies are used for measurements.
HOL
key
F1
function
key
CLEAR
key
Navigation
key
ON/OFF key
Confirmation key
(VAL)
F2 function
key
Measurement:
Current terminal
(positive)
4
-
wire
voltage/measurement
terminal
Measurement:
Current terminal
(negative)
3
-
wire
voltage/measurement
terminal
TM612
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TM612
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TM612A Connector
TM612
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B.1.3 The USB connector
The TM612 is fitted ith a USB connector (mini B) intended for uploading ne soft are versions and device
adjustment.
B.1.4 The screen
The TM612 is fitted ith a graphic LCD display ith back-lighting. The display resolution is 160 x 160 pixels.
In normal operating conditions, the display is divided up into seven horizontal fields:
•The 1st field indicates the operating mode.
•The 2nd field indicates the date, time and battery charge.
•The 3rd field is reserved for icons indicating the operating mode (related functions: Scaling,
filtering, etc).
•The 4th field indicates the operating mode, the gauge and c ertain related functions.
•The 5th field indicates the value of the measurement. These values are expressed in ohms, °C, °F
or %.
•The 6th field indicates (in measurement mode) the minimum, average and maximum values of the
measurement.
•Lastly, the 7th field indicates the function of keys F1 and F2.
1st field
indicating the
operating mode
2
nd
field
indicating the
Date, time and
battery charge.
3
rd
field
indicating the
configuration by
pi
ctograms
4th field indicating the
measurement, the
gauge and the main
related functions.
5
th
field
indicating the
value of the
measurement
of the
transmission
setpoint (in
mV, °C, °F or
%)
6
th
field
indicating the
min, avg and
max.
measurement
values.
7
th
field indicating
the functions of the
F1 and F2 keys.
USB port
(mini B connector)
US
B port
(mini B connector)
TM612A
Connector
TM612
Connector
TM612
Connector

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The table belo provides a definition of each pictogram displayed on the screen:
Symbol
Description

Scaling

On hold
Filtering
%FS function (Full Scale)
Error
Condition
- 

 

 

 

 

 

 indicates open input or extreme over-range of instrument
(negative symbol ith 6 dashes)
+ : 

 

 

 

 

 indicates measurement is over- range of instrument
(positive symbol, colon and 5 dashes)
- : 

 

 

 

 

 indicates measurement is under-range of instrument
(negative symbol, colon and 5 das hes)
Incremental mode using the arro s
Battery life indication
Acquisition in progress (the value on the right of the pictogram indicates the
number of values recorded)
The table belo provides a definition of each pictogram of the function keys
Symbol Description
Tab key
Open a drop-do n list
Close a drop
-
do n list
Delete the selected item
Clear the selection
Add the item being edited
B.1.5 etting started (after power-up)
On po er-up (inserting the batteries or pack of batteries), the device is automatically turned on (loading the
soft are in the memory).
B.1.6 Main characteristics
B.1.6.1 Resistance/temperature measurement
The follo ing gauges are available:
auge 400 Ohm (for PT100) 3600 Ohm (for
PT1000)
Resolution (display)
10 m
Ω or 0.01 °C or
0.01°F
100 m
Ω or 0.01 °C or
0.01°F
Scope of range:
0
Ω to 400 Ω
-220°C to 850°c
-
220.00 °C to 850.00 °C
0
Ω to 3600 Ω
-220°C to 760°C
-
220.00 °C to 760.00°C
Scaling yes yes
B.1.6.2 Electrical characteristics not to be exceeded.
Function auges Max Vin I measurement
Ohm measurement 400Ω/3600Ω 60 V
TM612
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C. MODE PRO RAMMIN
C.1.1 Resistance or temperature measurement using resistive sensors
•The function type selection (Resistive sensor type) is made using the F1 key (Configuration
menu).
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), position the cursor in the Function field.
•Confirm the latter using the VAL key.
In the MEASUREMENT CONFI URATION menu, position the cursor in the Probe field using the F1
key.
•Enter the Probe menu using the F2 key.
•Choose the type of sensor (PT50, PT100, PT200, etc), using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓).
•Press VAL to confirm.
•Using the F1 key, define the Display Unit by positioning the cursor on it.
•Enter the menu by pressing F2.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), select the unit.
•Press VAL to confirm.

TM612
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Attention, the choice of °C or °F is made in the Setup\Preferences\Unit of temp. menu
•Press VAL (again) to confirm the desired function and go back to the measurement screen.
The Measure mode makes it possible to display the Minimum (bottom left), Average (bottom center) and
Maximum values (bottom right) from the last Min/Max reset command.
•Access this command by pressing the F2 key.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), position the cursor in the Min/Max reset field.
•Confirm the latter using the VAL key.
TM612
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D. RELATED FUNCTIONS
.1 Scaling
The scale correction function performs conversion operations bet een the electrical values measured and the
physical values converted.
This lineariz ation operation makes it possible to partially correct the errors induced by non-linear
sensor/converter systems.
The Scaling function allo s definition of up to 11 correction values, i.e. 10 segments, in order to approach as
much as possible the non-linear response curve, and to make the scale corrections according to each defined
segment.
The pictogram  is displayed on the screen in the active indo hen the scaling function is enabled.
The Define/list of points menu makes it possible to program up to 10 lines of 2 values: X and Y= f(X).
In measurement mode: X = Value measured and Y = Value Displayed.
The lines entered are sorted according to the X in increasing order, to scale an X-value, the device seeks the 2
lines n and m=n+1 hich frame it, and extrapolates linearly: Y = Yn + (X-Xn) x (Ym-Yn)/(Xm-Xn)
Use the function keys to edit the points:
To add a line: enter X and Y, then press the function key.
To select a line in a list, use the Up and Do n navigation keys.
To delete a selected line, use the key.
To move from one field to the next, use the key.
The Define/parameters menu makes it possible to define the format (Number of digits displayed) and unit.

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Once the parameters have been set, the scaling is automatically enabled. To disable it, enter the
Configuration/Scaling ON menu, select OFF and confirm by pressing the VAL key.
.2 ifferential measurements
The relative measurement function available on the device makes it possible to cancel a constant or spurious
value via programming. Selecting Configuration/NULLIN /ON ill null out the value defined in the Tare
value box. Selecting Tare ill null the current value displayed and ill update the NULLIN /Define... Tare
value box ith this ne value. Selecting Configuration/NULLIN /OFF ill return the unit to its original
display value.
When the relative measurement function is enabled, the symbol is displayed on the measurement
screen.
Scaling
pictogram
Pictogram of the
TARE mode
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The NULLIN /Define menu makes it possible to program the value of the Tare (positive or negative). This
value is obtained from the measurements:
Value Displayed = Value measured – Value of the Tare
.3 Calibrated sensors
The calibrated sensors function of the device makes it possible to use sensors, the calibration (correction)
coefficients of hich are taken into consideration by the device during measurement.
•Using the F1 key, enter the Configuration menu.
•Select the Calibrated sensors function, follo ed by one of the 5 available sensors.
•Confirm by pressing VAL.

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•Enter the sensor information fields. Use the F1 function key ( ) to move from one field to the next.
•Confirm your choice using the VAL key.
•To add a value in the table of calibration points, use the keys, enter the calibration points (real
value and value read) then confirm using the VAL key.
•Repeat this operation for all the calibration points (maximum of 4).
To delete a line, select it then use the key.
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- 20 -
To edit a line, select it then use the navigation key (

) to make editing possible.
•Confirm using the VAL key to return to the measurement screen.
To ensure the measurements are made using the calibration coefficients defined earlier, go to the
Configuration/Function menu.
•In the Probe field, select sensor1 (SONDE1-SENSOR1 belo ).
Note: the Calibrated sensors are at the top of the list and their name is preceded by an *.
•Confirm the latter using the VAL key.
The chosen calibrated sensor is displayed in the measurement screen.
.4 Storage of acquisitions in progress.
The TM612 is designed to store 10,000 values in one or more acquisition bursts.
•Using the F2 key, enter the Mode menu.
•Select the Memory function.
•Confirm using the VAL key.
Name of
calibrated sensor
used

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The drop-do n list displays the follo ing functions:
SAVE MEASUREMENT:
Enable the triggering of an acquisition on a case-by-case basis.
If an acquisition has already been opened, then the follo ing screen is displayed:
Press the F2 key (YES) to confirm.
•You are then requested to enter the name of a file. Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), scroll
do n the letters.
•Using the navigation keys (

 and 

), move the cursor by one position.
•Using the F2 key( ), you can delete the characters entered
•Once you have entered the file name, confirm by pressing the VAL key.
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- 22 -
RUN:
Launches the storage of data follo ing the parameters set in the “parameters” function. The pictogram is
displayed on the measurement screen
STOP:
Stops the storage in progress.
PARAMETERS:
Allo s you to define:
•The size of the acquisition (max 10,000 values),
•The sampling period from 0.5 S to 30 Min,
•The type of trigger (None, lo level, high level).
If you have selected a lo level or high level trigger, you must define the trigger level and the number of data
to record after this trigger (Post-trigger).
Display burst:
You can display the burst in the form of a table of values or a trend curve.
Post trigger = 900 measurements
Size of block (1,000 meas
urements)
Trigger on programmed
value= 10 °C

TM612
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At this level, it is possible to
- display the trend curve entirely: press the F1 key (GRAPH).
- or place markers so as to display in the form of a graph all the values included bet een these 2 markers. To
do so, press the F2 key.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), move the cursor to the value to be marked “value 1” and
press the F1 key (1>>).
•For the second marker, press the F2 key (…) and using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), move the
cursor to the value to be marked “value 2” and press the F1 key (2>>).
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- 24 -
In this particular example, the graph ill display values included bet een positions 9 and 20.
•Press the F2 key t ice, to reach the RAPH function, then press F1 to confirm.
At this level, you can display the hole curve or a zoom around the cursor. The cursor is moved using the
navigation keys (

 and 

)
•Press CLEAR to return to the table of values.

TM612
- 25 - - 25 -
At this level, you can find out some statistics on the measurements made (Minimum, Maximum, Average and
Standard Deviation).
•Press the F2 key three times (…) follo ed by the F1 key (STAT).
•Press F2 (measurements) to return to the table of values.
•Press CLEAR to quit the storage function.
Save burst:
This function makes it possible to record the burst in the memory.
•You are then requested to enter the name of a file. Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), scroll
do n the letters.
•Using the navigation keys (

 and 

), move the cursor by one position.
•Using the F2 key( ), you can delete the characters already entered
•Using the F2 key( ), you can delete the characters entered
•Once you have entered the file name, confirm by pressing the VAL key.
Open a burst:
Allo s you to choose a specific burst from the list and open it to display the values. At this level, you can
obtain information on the acquisition burst, such as the number of measurements, the date of acquisition, the
sensor used, etc.
New free burst:
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- 26 -
Allo s you to start a ne acquisition burst. If a burst is under ay, you ill be requested to save it.
Burst management:
Allo s you to display all the bursts recorded. At this level, you can delete one or all bursts.
Statistics:
Allo s you to find out the number of bursts recorded, the number of bytes free as ell as the number of
measurements that can be recorded.

TM612
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E. PARAMETER SETT IN S
E.1 Contrast adjustment
In the CONFIGURATION/SETUP menu, you can adjust the display contrast.
•Access this menu using the F1 key.
•Selec t the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Selec t the Contrast field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Using the navigation keys (

 and 

), modify the contrast as required.
E.2 ate and time setting
In the CONFIGURATION/SETUP menu, you can set the time and date.
•Access this menu using the F1 key.
•Selec t the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Selec t the Date/hours field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Use the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓) to modify the various parameters.
•Use the navigation keys (

 and 

) to go to the next field.
•Press VAL to confirm.
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E.3 “Preferences” setting.
E.3.1 Filtering setting.
In the event of noisy measurements, you can filter the latter to make the value displayed on the screen more
stable.
•Access this menu using the F1 key (configuration menu).
•Select the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Filtering field by pressing the F1 key.
•Four filtering values are available (OFF, 0.5s, 1s and 2s). Select these values using the navigation
keys (↑
↑↑
↑ and ↓
↓↓
↓).
•Confirm by pressing the VAL key.
E.3.2 Display resolution setting.
In the CONFI URATION/SETUP/PREFERENCES menu, you can select the desired display resolution:
•Access this menu using the F1 key.
•Select the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Display resolution field by pressing the F1 key.
Three types of resolution are available: high (.01), medium (.1) and lo (1).
•Select this resolution using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓).
•Confirm by pressing the VAL key.
E.3.3 Backlight duration setting.
In the same menu (CONFI URATION/SETUP/PREFERENCE), you can control the duration of the backlight
(manual, 10s or 1min). Press the ON/OFF key briefly to turn on the backlight for the selected duration (10s
or 1min). Press it again briefly to start the timing or to turn off the backlight hen in manual mode.
•Access this menu using the F1 key.
•Select the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Lighting field by pressing the F1 key.
•Choose the manual or timed mode using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓).
•Confirm by pressing the VAL key.
E.3.4 “Key beeping” setting.
In the CONFI URATION/SETUP/PREFERENCE menu, you can emit a beeping sound every time a key is
pressed:
•Access this menu using the F1 key.
•Select the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Key beep field using the F1 key.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), select the ON or OFF mode then confirm by pressing the VAL
key (if the parameter settings are completed or go to the next field using the F1 key).
E.3.5 Language setting
In the CONFI URATION/SETUP/PREFERENCES menu, the interface language can be selected from
English, French, German, Italian or Spanish.
•Access this menu using the F1 key.
•Select the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Select the Language field using the F1 key.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), select your desired language then confirm by pressing the
VAL key (if the parameter settings are completed or to go to the next field use the F1 key).

TM612
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E.3.6 Temperature unit setting
In the CONFI URATION/SETUP/PREFERENCES menu, you can choose the temperature unit that ill be
displayed.
•Access this menu using the F1 key.
•Selec t the Setup field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Selec t the Preferences field using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), then confirm.
•Selec t the Unit of temp. field using the F1 key.
•Using the navigation keys (↑
↑↑
↑ and ↓
↓↓
↓), select the desired unit then confirm by pressing the VAL key.
E.4 “Maintenance” menu
As part of the follo -up on measurement quality, the user may be asked to perform a regular check of the
performance levels.
This check must take into consideration the customary measurement precautions. The follo ing instructions
should be follo ed.
Any handling operations should be performed in the follo ing reference conditions:
•Temperature of the room: 23°C ± 1°C.
•Relative humidity: 45 % to 75 %.
Follo ing this check, should the user find that one or more characteristics of the device are outside the
tolerances specified in chapter F, said user may:
•Either proceed ith the appropriate adjustment, according to the follo ing procedure, hich
requires equipment hich features at least the same performance levels as the one used for the
previous check.
•Or return the device to the follo ing address for checking and adjustment.
If service or re-certification of your instrument is needed, please contact us via phone, fax or e-mail, for a
Return Material Authorization (RMA) number.
If the unit is to be returned, it is preferable to use the original packaging and return ith transportation
charges prepaid.
Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804-1228
Phone: [phone]
Fax: [phone]
Ema l : [e-mail]
E.4.1 Adjustment from the Maintenance menu
TM612
- 30 -
The TM612 may be adjusted using an instrument ith a precision of more than 50 ppm.
To adjust the device, go to the Configuration/Maintenance menu, enter the pass ord 9456 and then press
the VAL key.
Using the F1 function key, open the menu to access the follo ing functions:
Init EEP:
Allo s you to initialize part of the EEPROM (Calibrated Sensors Coefficient)
Measurement:
Allo s you to access the gauge adjustment functions.

TM612
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The 1st screen indicates the gain and offset correction value found for the adjustment of this gauge. The
counter indicates the number of adjustments the device has undergone ith the date of the last adjustment.
To perform an adjustment:
•Press the VAL key.
The adjustment is performed in 2 points, around 010 Ohm and 300 Ohm. Apply the calibration resistance
every time it is requested, and enter the value of this calibration in the “Value Applied” field.
•Confirm each step using the VAL key.
Calibration information:
Should the device undergo calibration, you can enter the date of this calibration and the certificate reference
number.
E.5 “About the instrument” menu
In the Configuration/About menu, you can find out:
•The instrument part number
•The Serial number
•The soft are version
•The name of the company
•The date of adjustment
•The date of calibration
TM612
- 32 -
F. SOFTWARE UPDATE
The soft are is updated by the UPG32 program available from Palmer Wahl. To find out hich version of
firm are is installed in your unit, use the Configuration  About menu.
The quickest ay to find out if an update is available is to contact Customer Service at Palmer Wahl.
To update the firm are, proceed as follo s:
1. If necess ary, install on the PC the USB driver for communication ith W ahl instruments.
2. Disconnect the leads connected to the measurement and simulation terminals.
3. Connect the ins trument to the PC using the USB lead.
4. Do nload and run the firm are update program.
5. Select the language then the file c ontaining the firm are and do nload in the first stage.
6. Choose the communication parameters that match the parameters of the TM612. The
communication port used is a virtual port hich does not correspond to a physical port on your
computer. The other parameters to be selected are defined in the diagram belo .
7. Confirm the update by pressing “OK” and ait for the firm are to load into the unit.

TM612
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. TECHNICAL SPECIFICATIONS
The precision expressions mentioned herein apply from + 18°C to + 28°C, unless other ise specified, and are
expressed in ± (n % R + C) here R = Reading and C = Constant expressed in practical units, for a
confidence interval of 95%.
They apply to a device positioned in the reference conditions defined after fifteen minutes of pre-heating.
The precision includes the precision of the reference calibrations, the non-linearity, hysteresis, repetitiveness
and long-term stability over the time period mentioned.
G.1 Measurement Function
Rated maximum voltage in common mode: 60 VDC or VAC.
.1.1 Resistance
The resistance measurement function is obtained by configuring the device as follo s:
Sensor: PT100 and Unit: Ohm for the 400 Ohm gauge.
Sensor: PT1000 and Unit: Ohm for the 3600 Ohm gauge.
auge Scope of
measurement
Resolution
(min)
Precision / 1year
400 Ohm
0
Ω to 400 Ω
10 m
Ω
0.012% R + 10 m
Ω
3600 Ohm
0
Ω to 3600 Ω
100 m
Ω
0.012% R +100 m
Ω
Temperature coefficient < 10 ppm/°C from 0°C to 18°C and from 28°C to 50 °C.
•Automatic iring diagram detection: 2 ires, 3 ires or 4 ires.
•In the 2- ire assembly, the measurement includes the line resistances.
•In the 3- ire assembly, add the line resistances imbalance.
•Measurement current 0.65mA
.1.2 Temperature by resistive sensors.
Sensor Scope of measurement Resolution Precision / 1year
Pt 50 (
α
= 3851)
-
220°C + 850°C
0.01°C
0.012 % R+ 0.06°C
Pt 100 (
α
= 3851)
-
220°C + 850°C
0.01°C
0.012 % R+ 0.05°C
Pt 100 (
α
= 3916)
-
200°C + 510°C
0.01°C
0.012 % R+ 0.05°C
Pt 100 (
α
= 3926)
-
210
°C + 850°C
0.01°C
0.012 % R+ 0.05°C
Pt 200 (
α
= 3851)
-
220°C + 1,200°C
0.01°C
0.012 % R+ 0.12°C
Pt 500 (
α
= 3851)
- 220°C + 1,200°C 0.01°C 0.012 % R+ 0.07°C
Pt 1,000 (
α
= 3851)
-
220°C + 760°C
0.01°C
0.012 % R+ 0.05°C
Ni 100 (
α
= 618)
-
60°C + 180°C
0
.01°C
0.012 % R+ 0.03°C
Ni 120 (
α
= 672)
-
40°C + 205°C
0.01°C
0.012 % R+ 0.03°C
Ni 1,000 (
α
= 618)
-
60°C + 180°C
0.01°C
0.012 % R+ 0.03°C
Cu 10 (
α
= 427)
- 70°C + 150°C 0.10°C 0.012 % R+ 0.18°C
Cu 50 (
α
= 428)
-
50°C + 150°C
0.01°C
0.012 % R+ 0.06°C
For negative temperatures, use the value displayed R and not its absolute value.
Temperature coefficient: < 10 % of precision/°C.
The above precision is given for a 4- ire connection to the temperature sensor.
You should also take into consideration the actual error of the temperature sensor used, as ell as the
conditions of its setup.
Measurement current: 0.65 ma