Tegam 940A, 945A Operation Manual

940A/945A

10 TEGAM WAY ● GENEVA, OHIO 44041 ● 440-466-6100 ● FAX [phone] ●

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D

IGITAL TEMPERATURE CALIBRATOR -

THERMOMETER

Model:

940A / 945A

T/C Thermometer

Operation
Manual

rev A

Manual Part Number: 940A-900, Rev. A

Published February 2019, Geneva, OH

Notices

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NOTICES

Copyright Notice

© TEGAM, Inc., 2019

No part of this manual may be reproduced in any
form or by any means (including electronic
storage and retrieval or translation into a foreign
language) without prior agreement and written
consent from TEGAM, Inc. as governed by United
States and international copyright laws.

Trademark Acknowledgments

This Manual

Part Number:940-900
Revision A, February, 2019
Supersedes: None

Published by:

TEGAM, Inc.
10 TEGAM Way
Geneva, OH 44041

Disclaimer and Manual Revisions:

THE MATERIAL CONTAINED IN THIS USER
MANUAL, AND ANY COMPUTER
SOFTWARE ASSOCIATED WITH THIS
USER MANUAL OR THE PRODUCTS
COVERED BY IT, ARE PROVIDED AS IS,
AND ARE SUBJECT TO CHANGE, WITHOUT
NOTICE, IN FUTURE REVISIONS.

This User Manual was current at the time of
publication. However, TEGAM is dedicated to a
process of continual product improvement, and
the products covered by this User Manual, and
any associated computer software, are subject to
periodic functional and design updates. Please
visit tegam.com for the most current product
documentation.

U.S. Government Rights

This computer software and/or technical data is
TEGAM proprietary information developed
exclusively at private expense. Computer
software and technical data rights granted to the
federal government include only those rights
customarily provided to the public, pursuant to
FAR 12.211 (Technical data) and FAR 12.212
(Computer software) for the federal government,

and DFARS 252.227-7015 (Technical data –
Commercial items) and DFARS 227-7202-3
(Rights in commercial computer software or
commercial computer software documentation)
for the Department of Defense. Except as
explicitly permitted by the foregoing,
reproduction for non-governmental use of the
information or illustrations contained in this
computer software and technical data is not
permitted.

Compliance

CE, (2014/30/EU), UL, CSA, MIL-PRF-28800F

Class 2

RoHS 2 Directive, 2011/65/EU Compliant,

REACH

Safety Notice Symbols and Terms

Safety Notices denote hazards. They indicate an
operating procedure, instruction, or practice
that, if not correctly performed or followed, could
result in damage to equipment, or injury or death
to personnel. Do not proceed beyond a Safety
Notice until all conditions and instructions are
fully understood and complied with.

Safety Notices Symbols:

WARNING

WARNING denotes an

imminent hazard that could
result in injury to personnel or

death.

CAUTION

CAUTION denotes a hazard

that could result in damage to

the unit or other equipment.

REMINDER denotes important
information about instrument
functions, menus, and

measurements.

Table of Contents

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TABLE OF CONTENTS

1. Instrument Description ........................................................................... 1-1

Specifications ................................................................................. 1-1

Optional Accessories and Ordering Information ................................... 1-5

TEGAM Family of Thermometers ........................................................ 1-5

2. Preparation for Use ................................................................................ 2-1

General Information ........................................................................ 2-1

Feature Overview ............................................................................ 2-1

Safety Notices and Information ......................................................... 2-2

Unpacking and Inspection ................................................................ 2-4

Battery Installation and Replacement ................................................. 2-4

Initial Power ON .............................................................................. 2-5

3. Operating Instructions ........................................................................... 3-1

Keypad Functions ............................................................................ 3-1

LCD Display .................................................................................... 3-2

Setup Menu .................................................................................... 3-4

View Modes and Statistics ................................................................ 3-6

Auto-Power Off ............................................................................... 3-7

Backlight and Backlight Timeout ........................................................ 3-8

Operating Modes ............................................................................. 3-8

Trend Indicators .............................................................................. 3-9

Battery Indicator ............................................................................. 3-9

Probe Offset ................................................................................... 3-9

Open Lead Detection Enable/Disable ................................................ 3-11

Clear Function ............................................................................... 3-11

Presets: Save, Recall and Erase ...................................................... 3-12

Invalid Measurement Indications ..................................................... 3-13

4. Service Information ............................................................................... 4-1

Inspection and Cleaning ................................................................... 4-1

Calibration ...................................................................................... 4-1

Troubleshooting .............................................................................. 4-6

Diagnostic Routines and Error Codes ................................................. 4-7

Memory Sterilization ........................................................................ 4-8

Preparation for Calibration or Repair Service ....................................... 4-9

Expedite Repair & Calibration Form.................................................. 4-10

Warranty ...................................................................................... 4-11

Warranty Limitations ..................................................................... 4-11

Statement of Calibration ................................................................ 4-12

A. Required Equipment ............................................................................... A-i

B. Expanded Instrument Uncertainties .......................................................... B-i

C. Instrument Verification Data Sheet ........................................................... C-i

Instrument Description

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1. INSTRUMENT DESCRIPTION

Specifications

Source/Measure

Accuracy

±0.003% * [READING] ± 5µV 18° TO 28°C

1

R

ESOLUTION

0.01°C

UP TO

999.99°C

AND

0.1°C ≥ 1000°C

R

ANGE

-15MV

TO 85M

V

C

OLD JUNCTION ERROR

±0.15°C

DISPLAY

5-D

IGIT AUTO-RESOLUTION

(0.1/0.01)

WITH BACKLIGHT AND

FUNCTION

ANNUNCIATORS

A

CCURACY1 OVER RANGE OF 18 TO

28°C (64.4

TO

82.4°F) | CJC error included

Conformity

ITS-90

Types B,E,J,K,N,R,S,T

EN 60584-1 2013 Type C

ASTM E988 Table 3 Type D

ASTM E1751 5.1.1 Type G

DIN 43710

Types L and U

ASTM E1751 5.1.2

Type P

Temperature Ranges

°C Range

°C

K

-230°C - 1372°C

-382°F - 2502°F

-230 to -160

±1.2 to ±0.6

-160 to -90

±0.5 to ±0.4

-90 to 380

±0.3

380 to 665

±0.2

665 to 1372

±0.3

J

-200°C - 1200°C

-328°F – 2192°F

-200 to -160

±0.7 to ±0.5

-160 to -110

±0.4

-110 to 10

±0.3

10 to 1200

±0.2

T

-260°C – 400°C

-436°F – 752°F

-260 to -190

±2.6 to ±0.7

-190 to -120

±0.6 to ±0.5

-120 to -70

±0.4

-70 to 80

±0.3

80 to 400

±0.2

1

See Graphs in Appendix B for Expanded Uncertainties

Instrument Description

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E

-240°C – 1000°C

-400°F – 1832°F

-240 to -150

±1.2 to ±0.4

-150 to -100

±0.4

-100 to 20

±0.3

20 to 1000

±0.2

B

2

310°C – 1820°C
590°F – 3308°F

310 to 595

±1.8 to ±1.0

595 to 830

±0.9

830 to 965

±0.7

965 to 1820

±0.6

N2

-230°C – 1300°C

-382°F – 2372°F

-230 to -150

±1.6 to ±0.7

-150 to -50

±0.5

-50 to 215

±0.3

215 to 1300

±0.2

R2

-15°C – 1768°C
5°F – 3214°F

-15 to 100

±1.2 to ±0.8

100 to 240

±0.7

240 to 495

±0.6

495 to 1768

±0.5

S2

-20°C – 1768°C

-4°F – 3214°F

-20 to 75

±1.2 to ±0.9

75 to 150

±0.8

150 to 285

±0.7

285 to 1768

±0.6

G2

100°C - 2315°C
212°F – 4199°F

100 to 240

±1.0 to ±0.6

240 to 310

±0.5

310 to 460

±0.4

460 to 2315

±0.3

C2

0°C – 2315°C
32°F – 4199°F

0 to 60

±0.5

60 to 2200

±0.4

2200 to 2315 ±0.5

D2

0°C – 2315°C
32°F – 4199°F

0 to 100

±0.6 to ±0.5

100 to 230

±0.4

230 to 2315 ±0.3

2

Thermocouple types B, N, R, S, C, D, G, P, L and U are model 945A only.

Instrument Description

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P2

0°C to 1395°C
32°F to 2543°F

0 to 1395 ±0.3

L2
J-DIN

-200°C - 900°C

-328°F – 1652°F

-200 to -90

±0.6 to ±0.4

-100 to -40

±0.4

-40 to 655

±0.3

655 to 665

±0.4

665 to 900

±0.3

U2
T-DIN

-200°C – 600°C

-328°F – 1112°F

-200 to -75

±0.8 to ±0.5

-75 to 0

±0.4

-0 to 385

±0.3

385 to 600

±0.2

Connector Type

Two (2) Mini-TC Copper

Temperature Units

°C, °F, mV

Probe Zero Function

Resolution 0.1 °C/°F

Reading Rate

3/sec. for Readings and TREND indicators

Battery Type

3 AA (IEC LR6, ANSI 15) Alkaline

Battery Life

500 Hours Typical

Battery Indicator

Four (4) Stage Battery Charge Indicator

Display

Two (2) rows of Five (5) digit LCD with separate minus

sign, decimal indicators, with offset, thermocouple types
KJTEBNRSGCDPLU, battery, source, read, temperature
units, voltage units, percent, trend, PRST (0-19), MIN,
MAX, AVG, RNG, STDEV, Transfer, symbols: Fast Ramp,
Slow Ramp, Step, Bluetooth

Statistics

Minimum Reading, Maximum Reading, Average Reading,

Reading Range, Standard Deviation

Display Backlight

Four (4) LED Backlight with 30-second timeout

Display Resolution

0.01° <1000 °

.1° ≥ 1000 °

Auto Off

20 minute no key pressed Auto Off. Feature can be

disabled

Keypad

Twelve (12) momentary switches with audible and tactile

feedback

Power Cycle

Configuration
Retention

Instrument retains: Sensor Type, Temperature Unit

Offset Values, Presets, Statistics, Open Lead detection
status, 0%/100% span settings, and operating mode

Instrument Description

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Internal Preset Storage

20 Preset user-determined storage registers, 0-19

Input Current

±50 nA maximum

Maximum Common

Mode Voltage

42 V peak to earth 1 V p-p between T1 and T2

Low Resistance Load

Less than 5µV change in output with a 100KΩ resistance

Operating

Environment

Operating Temp

-20 to 55 °C

-4 to 131 °F

Storage Temp

-51 to 71 °C

-59.8 to 159.8 °F

Humidity

<10 °C (50 °F): Non-condensing

10 to 30 °C (50 to 86 °F): 5 to 95% RH
30 to 40 °C (86 to 104 °F): 5 to 85% RH
40°C to 55°C (104 to 131 °F): 5 to 60% RH

Altitude

0 to 4600 m

0 to 15,092 ft

Vibration

Random 10 – 500 Hz, 0.03 g2/Hz

Shock

30g Half Sine

Drop

4 Drops from 1 m to Concrete

Compliance, Electrical

CE, MIL-PRF-28800F Class 2

Compliance,

Substances

RoHS 2 Directive, 2011/65/EU Compliant, REACH

Electrical Safety

IEC-61010

EMC

EN 61326, MIL-PRF-28800F, Class 2

ESD

IEC 61326 Criterion B

Sanitation

NSF/ANSI/3-1 14159-2

Standards

MIL-PRF-28800F, Class 2

Temperature
Coefficient

For specification variances due to ambient operating temperature,

see the Expanded Instrument Uncertainty charts in Appendix B of
this manual. For ambient operating temperatures not shown in
Appendix B, accuracies shall be interpolated linearly.

Included Accessories

3 AA Batteries, Quick Start Guide, Tilt Stand/Magnetic,

Calibration Report

P

HYSICAL

CHARACTERISTICS:

Dimensions

193 x 84 x 28 mm

7.6 x 3.3 x 1.1 in

Weight including

Batteries

362.9g 12.8 oz.

Instrument Description

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Optional Accessories and Ordering Information

P

RODUCT

M

ODEL

D

ESCRIPTION

Hard Carry Case

911-911

Foam-Filled Hard Carry Case

Soft Carrying

Pouch

710-912 Soft Carry pouch

Wire Probe

9K002MTC36

3‘ Type K wire probe

Calibration
Adapter Cable

940-912K

940-912J
940-912T
940-912E
940-912U
940-912R/S
940-912N

Available in Type K,J,T,E,U,R/S or N: Includes a 3’
Calibration cable terminated with a male MTC and ¼”
spade lug; a standard thermocouple connector; and
a standard to male mini adapter.

Printed Manual

940-900

Operation Manual

Manual

Translations

Chinese, Dutch, French, German, Japanese, Korean,

and Spanish (download at tegam.com)

Service Options

Calibration with Statement of Traceability

TEGAM Family of Thermometers

Thermocouple

Thermometers

911B

Thermocouple Thermometer, Single Input

912B

Thermocouple Thermometer, Dual Input

Data

Thermometers

931B

Data Thermometer, Single Input

932B

Data Thermometer, Dual Input

Preparation for Use

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2. PREPARATION FOR USE

General Information

This manual provides operating instructions and maintenance information for two calibrator
instruments, 940A and 945A. These instruments are high performance calibrator­thermometers capable of simulating and measuring a wide-variety of sensors. In addition,
features such as high accuracies, preset storage, ramp, step and transfer modes further
enhance their versatility.

It is recommended that you read this manual thoroughly, especially the sections on safety,
prior to operating these instruments.

Feature Overview

• 0.01° / 0.1 ° display resolution

• Internal storage for 20 presets

• 500-hour battery life

3

• Five (5) digit dual LCD with LED Backlight

• Simultaneous Source/Measure

• Comprehensive real-time statistics: MIN, MAX, AVG, RNG, and STDEV

• Easy to clean

• Probe offset function to minimize probe error

• °F, °C, and mV temperature and voltage units

• Durable: Meets MIL-PRF-28800F, Class 2 requirements

• Tilt Stand/Magnet/Hanger

3

Typical battery life under normal use conditions in laboratory environment. Continuous or repeated use of

features such as the backlight or use or storage at high or low temperature extremes may reduce battery life.

Preparation for Use

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Safety Notices and Information

Read this Operation Manual thoroughly before using the instrument to become familiar with its

operations and capabilities.

Visually inspect instrument before using. Do not use if unit appears damaged or with any part of the

case removed.

WARNING

MAINTENANCE INSTRUCTIONS WITHIN THIS MANUAL ARE FOR USE BY QUALIFIED SERVICE

PERSONNEL ONLY. DO NOT ATTEMPT TO SERVICE THIS UNIT UNLESS YOU ARE QUALIFIED TO DO

SO.

SHOCK HAZARD

Disconnect all temperature probes and turn the unit off before removing the battery cover.

Never connect thermocouple leads to any source where more than 42 Volts (peak) could exist
between the lead and ground. If it is necessary to make measurements of an object at elevated

electrical potential, the user is responsible for obtaining and properly using a probe that provides
adequate insulation between the surface with elevated potential and the thermocouple wiring.

Always disconnect probe leads before opening the battery door or the instrument housing.

Internal circuits can present a shock hazard if leads are connected to a source of elevated potential.

Do not use this instrument if the housing, probe wiring, probe, or probe handle are damaged
or distorted. Housings and wire insulation are part of the personnel protection system, and if damaged

could expose users to elevated potentials.

EXPLOSION HAZARD

Never use or store this product with batteries installed, or change batteries, in an
environment where explosive or flammable vapors or dust suspensions may exist. For

thermocouple thermometers suitable for use in explosive environments, see TEGAM’s 921A or 922A
Intrinsically Safe Thermometers.

Do not attempt to recharge alkaline batteries.

Do not put batteries into bags designed to protect parts from electrostatic discharge (ESD).

These bags are specially designed with metal shielding which can short circuit a battery.

Do not expose batteries to extreme heat or fire. Observe all regional laws and regulations when
disposing batteries.

Never use this instrument or any temperature probe or sensor inside a microwave oven.

BURN HAZARD

Do not touch a temperature probe sheath that has been exposed to toxic substances or
extremely high or low temperatures.

Do not attempt to measure temperatures beyond the range of the temperature probe. Probe

damage or personal injury could result from exceeding a probe’s maximum temperature rating.

Safety Notices and Information continued on next page . . . .

Preparation for Use

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CAUTION

RISK OF INCORRECT READING

Do not use when AC or DC voltages in excess of 1V exist between thermocouple channels (on
instruments with more than one channel). Excessive voltage could result in an incorrect reading,

or in more extreme cases, a blown fuse that will result in incorrect readings and need for repair.

RISK OF INSTRUMENT DAMAGE

Only replace batteries with size AA (IEC LR6, ANSI 15). Observe proper polarity when installing
batteries. Do not mix old and new batteries.

Do not apply voltages across thermocouple leads in excess of normal thermocouple voltage
for the selected range. Excessive input voltage could result in blown fuse, component damage, or

fire. Application of excessive voltage is not covered by the warranty.

Avoid making sharp bends in probe or sensor lead wires. Bending lead wires at sharp angles can
damage the wire and cause probe failure.

When using both thermometer inputs and a voltage differential exists between the two
measurement points, at least one probe should be electrically insulated. If not, a ground-loop

current can flow through the thermocouple leads causing measurement error or instrument damage.

Static discharge through a connected temperature probe may cause instrument damage. Use

care to avoid static discharge when handling the instrument or connected probes.

Preparation for Use

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Unpacking and Inspection

Each instrument is electrically and mechanically inspected before shipment. Upon receiving
your new TEGAM Data Thermometer, unpack all items from the shipping container and check
for any obvious damage that may have occurred during transit. Use the original packing
materials if reshipment is necessary.

If any dents, broken, or loose parts are seen, do not use the equipment. Notify TEGAM
immediately.

Check that all items are present. If any items are missing, notify TEGAM immediately.

The following items are included with every new instrument:

• One (1) Calibrator Thermometer;

• One (1) Quick Start Guide;

• Calibration Report;

• Three (3) AA, 1.5 V batteries; and

• Optional accessories (if purchased).

Battery Installation and Replacement

Three (3) AA 1.5 V batteries are supplied with the instrument, but not installed. Read the
following battery replacement instructions before attempting to install or remove the
batteries.

CAUTION

Always turn the instrument off and disconnect any input connections before replacing

the batteries. Re-install the battery compartment cover before resuming use of the

instrument.

CAUTION

The battery compartment is sealed with a rubber gasket. Use care to not damage the
gasket when removing or installing the battery compartment cover.

CAUTION

Remove the batteries when storing the instrument for an extended period of time or
in a high temperature environment to prevent battery leakage and possible damage

to the instrument.

All measurement parameters may be reset to factory default if batteries are removed while
the instrument is powered on. Always turn the instrument off before changing batteries.

To install or replace batteries:

Required Tools: Phillips Head Screwdriver

1. Identify the battery compartment located on the back of the instrument (see
Figure 1 below);

2. Remove the two (2) battery compartment retaining screws;

3. Remove the battery compartment cover;

4. If present, carefully remove old batteries being careful to not damage the battery
contacts;

Preparation for Use

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5. Observing proper polarity, install three (3) new, AA alkaline (IEC LR6, ANSI 15)
batteries;

6. Re-install the battery cover and two (2) retaining screws;

7. At initial power on after battery replacement, allow approximately 30 seconds for
instrument to stabilize.

Figure 1: Battery Installation

Initial Power ON

TEGAM’s 900 Series Calibrator Thermometers are designed for easy operation, while still
providing a feature-rich experience via the intuitive user interface.

To get started follow these steps:

1. Perform Section 2.5, Battery Installation and Replacement;

2. The instrument will initially display every segment on the LCD for 2 seconds as a
test. An internal hardware, memory and battery self-test is performed during this
time.

3. Upon completing the internal tests, the instrument will immediately display the

Source and Read mode last user settings and battery indicator.

4. Set the desired measurement parameters as follows:

a. Enter the Setup Menu by pressing , hold the key down for

approximately 1.5 seconds, and then release it;

b. The active thermocouple type is flashing on the display. Use or

to select the desired thermocouple type. You are setting the

thermocouple type of the Read Channel.;

Retaining
Screws

Battery

Compartment

Gasket

Preparation for Use

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The arrows always change a value. The arrows position
the cursor or will act to select only when changing Thermocouple type,

desired digit or changing the mode.

c. Momentarily (do not hold) press to save your selection and move to

the next parameter;

d. The active temperature unit is flashing on the display. Use to

select the desired temperature unit (°C, °F, or mV);

e. Momentarily press to save your selection and move to the next

parameter;

f. Read Channel 2 offset value is flashing on the display. If the

temperature probe’s offset value is known, press to set the
Channel 2 probe offset to the probe’s offset value. See Section 3.10,

Probe Offset, for more information.

g. Momentarily press to save your selection and move to Open Lead

Detection, press to toggle on/off;

h. Momentarily press to save your selection and move to Source on/off;

See Section 3.3, Set Up, figure 4 for more information.

i. To save the current parameter value and exit the Setup Menu, press ;

j. To disregard changes made to the current parameter value and exit the

Setup Menu, press .

Service Information

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3. OPERATING INSTRUCTIONS

Keypad Functions

The instrument keypad is a twelve (12) key, sealed membrane keypad. Each key provides
audible and tactile user feedback when pressed. Key functions are described in Figure 2
below.

Power instrument ON or OFF and exits Key
Lock mode.

(1.5s)

Disable auto-power OFF

(1.5s)

Enter instrument Setup Menu

While in Setup Menu, save current value and
step to next parameter

Toggle display backlight

(1.5s)

Disable backlight 30-second timeout

While in Setup Menu, discard all unsaved
changes and exit menu

(1.5s)

Delete all saved measurement data and

reset all statistics currently stored in

memory, MIN/MIX/AVG/RNG/STDEV

(1.5s)

While in PRST selection mode with PRST flashing, erases current preset
number contents

Displays in order: Current Source Channel reading, MIN, MAX, AVG, RNG,
STDEV

While in Setup Menu, save changes and exit menu

While displaying Cold Junction Compensation (CJC) reading, toggles between
CJC 1 and CJC 2

(1.5s)

Displays Cold Junction Compensation (CJC) readings.

The 10%/90% key toggles between 10% and 90% of span. The first press
of the key goes to 10%.

The 0%/+25% key manually increments the output by 25% of the defined

span for the selected TC. Once the output reaches 100% the next press of

the key will wrap around to 0%.

Once in Preset, single press saves and exits leaving the selected preset
number active

(1.5s)

Enters the Preset selection mode

Up and Down Buttons: Increment/Decrement currently selected Source digit
by 1.

Left and Right Buttons: Move active Source digit indicator by 1 place left or
right.

Figure 2 Keypad Button Functional Description

The , , , and keys have multiple functions which can be accessed by
momentarily pressing the key, or alternatively, by pressing and holding the key for

Service Information

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approximately 1.5 seconds. Throughout this Operation Manual, the press and hold sequence

is indicated by the key designator followed by the subscript (1.5s). For instance,

(1.5s)

indicates that the key should be pressed and held for 1.5 seconds, then released to
access the desired function.

LCD Display

The display is a large, easy to read, dual LCD display, with an LED backlight for clear
viewing in low-light conditions. It simultaneously displays Source channel and Read channel
values, current thermocouple type and temperature unit, Source and Read channel labels,
trend indicators for the Read Channel and a battery voltage indicator.

In Statistics View, the initial value displayed is a mirror of the Source channel. Each press
of the View key after that displays the active statistic result and its corresponding label
below. See Figure 3 below for further description of each display indicator.

1

OFFSET is

applicable to
Reading in

Line 2

2

Source

Channel 5

digit display

3

The active

thermocouple

type

4

Remaining
battery life

5

Temperature
units

6

Active Digit
Indicator

7

milliVolt
designation

8

Read
Channel 5
digit display

9 Value displayed in Read Channel display is a percentage

10

Value displayed in the Read Channel is the Standard Deviation (using total

population formula) over the last 1000 measurement cycles.

11

4

Flashing: Broadcasting to pair with a device

Solid On: Bluetooth connection has paired

12

Transfer is active. TRANSFER mode reads the input TC and outputs an offset

corrected mV signal to an upstream TC input. Source output is matched to the

reading using the same user settings.

4

Bluetooth symbol on LCD reserved for future models.

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13 Range is currently displayed, the MAX minus MIN value.

14

Instrument is displaying the Average reading over the last 1000 measurement
cycles.

15

Step Function: There are 10 equal steps between 0°C and Span. Source
continuously steps up and down. There is a 2 second dwell time on each step.

16

MAX statistic. Displays the maximum reading over the last 1,000 measurement
cycles.

17

Slow Ramp: Source Channel continuously cycles from 0°C to Span and then back to

0°C. The ramp rate is 5°C per second.

18

MIN statistic. Displays the minimum reading over the last 1,000 measurement

cycles.

19

Fast Ramp: Source Channel continuously cycles from 0°C to Span and then back to
0°C. The ramp rate is 50°C per second.

20 Displays the number of the current 20 possible presets, (0-19).

21

PRST: Preset is active. Each preset value includes Source Value, TC Type, (no TC

type if in mV), Units, Mode, Span (0% and 100%), and preset number.

22 Trend Indicators, Read channel.

23 Minus sign, Read channel.

24 Read channel Label.

25 Minus sign, Source channel.

26 Source channel Label.

Figure 3: LCD Display Description

The LCD can display error information about the current measurement, as shown in Figure

4.

D

ISPLAY DESCRIPTION

OPEn No thermocouple probe is connected

O rnG

Over Range: The applied temperature is greater than the maximum
temperature for the selected thermocouple type

U rnG

Under Range: The applied temperature is less than the minimum
temperature for the selected thermocouple type

Figure 4: LCD Error Indications

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Setup Menu

Key designators followed by (1.5s), e.g.

(1.5s)

, indicate that the key should be

pressed and held for 1.5 seconds, then released to access the desired function.

Measurement settings are configured in the Setup Menu. Press

(1.5s)

to access the Setup

Menu. From within the Setup Menu, press to step through the user-definable parameters

and the keys to increment/decrement or keys to move left/right while in the
Setup Menu. The active parameter value will flash on the display or the active digit indicator
will flash beneath the digit.

Press to save a setting and exit the Setup Menu. Press to disregard unsaved changes
and exit the Setup Menu. If no key is pressed for 10 seconds, the current configuration is
saved and the instrument will exit the Setup Menu.

Figure 5 lists the user-definable parameters and the available values for each parameter.

To set a parameter value:

1. Press

(1.5s)

to enter the Setup Menu;

2. Press to cycle through parameters as shown in Figure 6 until the desired
parameter is reached;

3. To change the value of the current parameter, press

or ;

4. To save the current parameter value and cycle to the next parameter, press

(1.5s)

;

5. To save the current parameter value and exit the Setup Menu, press ;

6. To disregard changes made to the current parameter value and exit the Setup

Menu, press .

7. If parameter 2, “Temperature and Voltage Units” are set as either “°C” or “°F”, the
remaining parameter choices available are in Figure 5 below under “Setup Choices
for °C and °F”. If parameter 2 is set to “mV”, the remaining parameter choices
available are in Figure 5 below under “Setup Choices for mV”.

STATS

are not active in mV mode.

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5

The 945A includes K,J,T,E,B,N,R,S,G,C,D,P,L,U

6

All though still selectable, TC type is not visible on LCD while mV is the active unit

SETUP MENU CHOICES FOR °C AND °F

PARAMETER AVAILABLE VALUES

Thermocouple Type5 K, J, T, E

Temperature and
voltage Units

°C, °F, mV

Probe Offset ±0.1 ° increments

Open Lead detection

(old)

On / Off

Source (SourC) On / Off

If on – Set Span

Set 100% Level

Set 0% Level

If on – Set Mode

Manual

blinking

“__ __ __ __”

Fast Ramp

Slow Ramp

Step

Transfer

SETUP MENU CHOICES FOR MV

PARAMETER

AVAILABLE VALUES

Thermocouple Type

6

K, J, T, E

5

Temperature and

voltage Units

°C, °F, mV

Probe Offset

±0.1mV increments

Open Lead detection

(old)

On / Off

Source (SourC)

On / Off

If on – Set Span

Set 100% Level

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If no key is pressed for 10 seconds, the instrument will save the current configuration
and exit the Setup Menu.

View Modes and Statistics

The instrument features multiple view modes including a variety of real-time statistics, all
available at the touch of a button. Figure 6 below describes each view mode.

Set 0% Level

Range (rAnGE)

Range Hi mV (default)
[-15mV to +85mV]

Range Lo mV7

(mV flashing)

[-15mV to +35mV]

If on – Set Mode

Manual

blinking

“__ __ __ __”

Fast Ramp

Slow Ramp

Step

Transfer

7

Low range is for calibration verification only.

Figure 5

VIEW MODE

D

ISPLAY

INDICATOR

DESCRIPTION

Minimum MIN

Minimum temperature recorded during current
session

Maximum MAX

Maximum temperature recorded during current
session

Average AVG

Average of all temperatures recorded during
current session

Range RNG Maximum minus Minimum

Standard Deviation STDEV

Standard deviation of all temperatures recorded
during the current session1.

1

Standard Deviation is calculated using the population formula:  =

�

∑

(−µ)

2



Figure 6: View Modes and Statistics

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Press to change view modes. For each mode, the active measurement or statistic result
is displayed on the second line of the display.

When viewing statistics, the active statistic is indicated directly below the result.

Statistics are calculated continuously, beginning when the instrument is powered on or when

(1.5s)

is pressed.

It is important to note that changing parameter values or temperature probes will invalidate

the current statistics session. When using statistics, always begin by pressing

(1.5s)

to

delete existing statistics data and initiate a new statistics session.

Press to step through the available statistics. Statistics are displayed in the order shown
in Figure 7 below.

When using statistics, always begin by pressing

(1.5s)

to clear existing statistics

results and initiate a new statistics session.

The first line of the display indicates the current Source Channel value, regardless of
which view mode statistic is currently displayed.

M

ODEL

S

OURCE

CHANNEL

S

TATISTIC VIEW SEQUENCE

940A/
945A

Value from

source

channel

MIN MAX AVG RNG STDEV

Figure 7: Statistics Sequence

If the instrument records invalid measurement data during the statistics session such as an
over-range, under-range, or open input value, ————— will be displayed for each affected

statistic result.

To return to the active measurement mode, press repeatedly to step through the
remaining view modes, or cycle power.

Auto-Power Off

Key designators followed by (1.5s), e.g.

(1.5s)

, indicate that the key should be

pressed and held for 1.5 seconds, then released to access the desired function.

To conserve battery life, the instrument automatically turns off if no key is pressed for 20

minutes. To disable this feature, press

(1.5s)

. The remaining battery life indicator will flash

once, indicating auto-power off is disabled.

Auto-power off will remain disabled until instrument power is cycled. At next power on,
auto-power off returns to the default enabled condition.

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Backlight and Backlight Timeout

The instrument includes an LED backlight feature to ensure measurement data can be easily

read in low-light conditions. To activate the backlight, press .

Once the backlight is activated, it will automatically turn off after 30 seconds if no key is

pressed to preserve battery life. To disable the backlight timeout feature, press

(1.5s)

. The

backlight will flash to indicate the timeout feature has been disabled. To re-enable the

backlight timeout feature, turn the backlight off then on by pressing twice.

Operating Modes

The instrument has five (5) operating modes for channel one, “Source” including manual
operation explained in Figure 8 below. The operating modes are Manual, Fast ramp, slow
ramp, step and transfer.

OPERATING MODE

D

ISPLAY

INDICATOR

DESCRIPTION

Manual

blinking

“__ __ __ __”

Instrument operates by outputting a voltage that

corresponds to the set temperature or

millivoltage.

Fast Ramp

Instrument Ramps the output temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span in 20 seconds. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

millivoltage) and clear the fast ramp setting.

Slow Ramp

Instrument Ramps the output temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span in 120 seconds. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

millivoltage) and clear the slow ramp setting.

Step

Instrument Ramps the output temperature or

millivoltage from 0% of span to 100% of span and
back to 0% of span stepping at 10% increments,
dwelling 5 seconds at each step. This repeats
until stopped. Any other key press will stop the
output at the existing value (temperature or

millivoltage) and clear the Step ramp setting.

Transfer

Instrument sets the source output (temperature

or millivoltage) equal to the value on the “Read”
channel, (channel 2). This is an offset corrected
value. SOURCE output = READ voltage + CJC
voltage. This mode would be used for
troubleshooting systems and readouts. The

“Transfer” icon will blink and illuminate if selected.

Figure 8: Operating Modes