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CL23A, 24, 25, 26, 27

Digital Calibrator/Thermometer

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

 

TABLE OF CONTENTS

 

General Information.........................................................................

2

Common Specifications...................................................................

2

Unique Specifications ......................................................................

5

Features...........................................................................................

6

Manual Addenda .............................................................................

6

Unpacking Your Unit........................................................................

7

Safety Information ...........................................................................

7

Safety Precautions ..........................................................................

7

Battery Installation/Replacement.....................................................

9

Memory Backup..............................................................................

10

Operation with Rechargeable Battery.............................................

10

Operating Instructions.....................................................................

11

11.

Diagnostics and Error Messages......................................

11

12.

Initial Turn On ...................................................................

11

3.

Meter Mode Operation (Thermocouple) ...........................

13

14.

Meter Mode Operation (RTD, Thermistor, Ohms) ............

14

15.

Data Logging & Recall......................................................

15

16.

Calibrator Mode Operation (Thermocouples) ...................

17

17.

Calibrator Mode Operation (RTD, Thermistor, Ohms) .....

18

18.

Storage and Recall of Calibrator Settings ........................

20

9.

Step Function....................................................................

22

10.

Ramp Function .................................................................

22

Service Information.........................................................................

23

11.

Calibration Procedures .....................................................

23

12.

Calibration Verification......................................................

32

13.

Mechanical Parts Diagram................................................

38

Warranty .........................................................................................

45

Limitation of Warranty.....................................................................

45

Statement of Calibration .................................................................

45

1

GENERAL INFORMATION

This manual provides operating instructions and maintenance information for five temperature instruments. These instruments are high performance cali- brator-thermometerscapable of simulating and measuring awide-varietyof sensors. In addition, features such as data storage and ramping further enhance their versatility.

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

COMMON SPECIFICATIONS

THERMOMETER INPUTS: THERMOCOUPLE; Miniature TC jack. RTD, OHMS, THERMISTOR;T-seriesinstrumentation connector.

CALIBRATOR OUTPUTS: THERMOCOUPLE; Miniature TC jack. RTD, OHMS, THERMISTOR;T-seriesinstrumentation connector.

THERMOCOUPLE TYPES: K, J, T, E, N, B, R, S, G, C, D.

RTD TYPES: 1100Ω platinum ( = 0.00385) 1000Ω platinum ( = 0.00385)

THERMISTOR TYPE: 2252Ω (YSI Series 400).

RANGES: RTK;–200°Cto 1372°C,–328°Fto 2502°F

RTJ;–210°Cto 760°C,–346°Fto 1400°F

RTT;–200°Cto 400°C,–328°Fto 752°F

RTE;–230°Cto 1000°C,–382°Fto 1832°F

RTN;–200°Cto 1300°C,–328°Fto 2372°F

RTB; 500°C to 1820°C, 932°F to 3308°F

RTR; 0°C to 1768°C, 32°F to 3214°F

RTS; 0°C to 1768°C, 32°F to 3214°F

RTG; 300°C to 2316°C, 572°F to 4201°F

RTC; 0°C to 2316°C, 32°F to 4201°F

RTD; 0°C to 2316°C, 32°F to 4201°F

RTD; –200°Cto 850°C,–328°Fto 1562°F

THERMISTOR; –40°Cto 150°C,–40°Fto 302°F

OHMS; 0-999.99Ω

OHMS; 0-9,999.9Ω

OHMS; 0-99,999Ω

ACCURACY (18°C to 28°C ambient, 2 years)*:

K, J, T, E, N; ± 0.5°F (rdg ≥ –50°F)

K, J, T, E, N; ±1.0°F (rdg <–50°F)

B, R, S, G, C, D; ±1.7°F

2

RTD; ±0.2°F (rdg ≥ – 50°F)

RTD; ±0.5°F (rdg < – 50°F)

RTD; ±0.2°F ±0.04% rdg (meter mode)

THERMISTOR; ±0.5F

OHMS; ±0.02% range

* Exclusive of sensor errors, and lead resistance induced errors.

RESOLUTION: TEMPERATURE; 0.1°/1° F/C

RESOLUTION: OHMS; 0.01Ω /0.1Ω /1Ω

REPEATABILITY (1 week at constant ambient temperature):

K, J, T, E, N; ±0.2°F typ. B, R, S, G, C, D; ±1.0°F typ.

RTD, THERMISTOR; ±0.1°F typ. OHMS; ±0.01% rng typ.

TEMPERATURE COEFFICIENT:

From 18°C to 28°C, included in accuracy specifications. From 0°C to 18°C, and 28°C to 50°C:

K, J, T, E, N; ±(0.002% rdg + 0.03°C)/°C B, R, S, G, C, D; ±(0.002% rdg + 0.1°C)/°C

RTD, THERMISTOR, OHMS; ±(0.002% rdg + 0.004% rng)/°C

METER-MODEINPUT-CURRENT(THERMOCOUPLES):50nA typ.

METER-MODEREADING-RATE:1 reading/second typ.

METER-MODEEXCITATION-CURRENTS:

100Ω RTD; <2mA

1000Ω RTD; <200µA

999.99Ω ; <2mA

9999.9Ω ; <200µA

99999Ω ; <50µA THERMISTOR; T ≤ 113°F <50µA

T> 113°F, <2mA

CALIBRATOR MODE OUTPUT LOAD (THERMOCOUPLES): 500Ω min.

CALIBRATOR-MODEEXCITATION-CURRENTS:

100Ω RTD; 0.5 – 1mA (0.1 – 2mA typ.) 1000Ω RTD; 50 – 100µA (10-200µAtyp.)

999.99Ω ; Same as 100Ω RTD

9999.9Ω ; Same as 1000Ω RTD

99999Ω ; 10 – 20µA (1 – 20µA typ.) THERMISTOR; T ≤ 113°F, 10 – 20µA

T> 113°F, 0.5 – 1mA

MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth.

3

KEYPAD: 12 momentary switches with tactile feedback select;

On/Off

Change/Enter

Clear/–0

Sensor Select/1

°F/°C/2

Resolution/3

Operate/4

Store/5

Recall/6

Calibrator/Meter/Up Ramp/7

Calibrator Step/Down Ramp/8

Calibrator Ramp/Meter Hold/9

DISPLAY: 5 digit LCD, 0.4" height, and decimal point. Annunciators;

Loaded Memory Locations (10 for data storage, 4 for ramp parameters)

Low Battery (BAT)

Number Change Mode (NUM)

Calibrator Mode (CALIB)

Meter Mode (METER)

Operate Mode (OPR)

Store Mode (STO)

Recall Mode (RCL)

Meter Hold (HOLD)

Scale (°F/°C)

Sensor Type

POWER OFF CONFIGURATION RETENTION: Instrument retains last selected;

Sensor Type

°F/°C Scale

0.1°/1° Resolution

Calibrator/Meter Mode

Memory Contents (data storage and ramp parameters).

DIAGNOSTICS: Display codes indicate following conditions;

'BAT': Low Battery

'OPEN': Open Input Thermocouple, RTD or Thermistor.

'E-1'(momentary): Invalid Keypad Entry

'E-2'(momentary): Ramp Function Not Installed

'HI': Temperature Reading or Keypad Entry Exceeds Rating

'LO': Temperature Reading or Keypad Entry Too Low For Accuracy

LCD Test: During power-up,all segments and annunciators enabled momentarily

ENVIRONMENTAL LIMITS FOR OPERATING: 0°C to 50°C, less than 90% relative humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 50°C.

ENVIRONMENTAL LIMITS FOR STORAGE: –35°Cto 60°C, less than 95% relative humidity (R.H.) up to 35°C; reduce R.H. limit by 3%/°C from 35°C to 60°C.

POWER: 9 volt alkaline battery (NEDA 1604A).

4

BATTERY LIFE, CONTINUOUS: 10 hrs. typical, alkaline; 3 hrs typical,Ni-Cd(rechargeable).

BATTERY INDICATOR: Display indicates BAT when less than 10% of life remains.

DIMENSIONS, WEIGHT: 7.0" × 2.9 × 1.1". Net weight 12 oz.

UNIQUE SPECIFICATIONS

NOTE: The specifications below are specific to the model(s) as identified by model number. The difference specifications are in addition to the OVERALL SERIES SPECIFICATIONS found on pages2-5.

MODEL CL23A/CL23EC:

SENSOR SELECTION: K, J, T/K, J, T, L Thermocouples

ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5°F (rdg ≥–50°F).

±0.04% rdg (rdg > 1250°F) ±1.0°F (rdg < –50°F)

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications. From 0°C to 18°C, and 28°C to 50°C; less than ±(0.006% rdg +0.03°C)/°C.

RAMP FUNCTION: Not Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical,Ni-Cd(rechargeable).

MODEL CL24:

SENSOR SELECTION: K, J, T, E Thermocouples

ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5°F (rdg ≥–50°F).

±0.04% rdg (rdg > 1250°F) ±1.0°F (rdg < –50°F)

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications. From 0°C to 18°C, and 28°C to 50°C; less than ±(0.006% rdg +0.03°C)/°C.

RAMP FUNCTION: Not Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical,Ni-Cd(rechargeable).

MODEL CL25/CL25EC:

SENSOR SELECTION: K, J, T, E, N, B, R, S, G, C, D/K, J, T, E, N, B, R, S, L, C, D Thermocouples

RAMP FUNCTION: Included.

BATTERY LIFE, CONTINUOUS: 16 hrs typical, alkaline; 4 hrs typical,Ni-Cd(rechargeable)

MODEL CL26:

SENSOR SELECTION: K, J, T, E Thermocouples

100Ω Platinum RTD

2252Ω Thermistor

1,000Ω /100,000Ω Resistance

5

ACCURACY: (18°C to 28°C ambient, 2 years): ±0.5 °F (rdg ≥–50°F).±0.04% rdg (rdg > 1250°F) ±1.0°F (rdg <–50°F)OHMS; ±0.04% range

TEMPERATURE COEFFICIENT: 18°C to 28°C; included in accuracy specifications. From 0°C to 18°C, and 28°C to 50°C.

K, J, T, E; ±(0.006% rdg + 0.03°C)/°C

RTD, THERMISTOR, OHMS; ±(0.006% rdg +0.012% rng)/°C

RAMP FUNCTION: Not Included.

MODEL CL27/CL27EC:

SENSOR SELECTION: K, J, T, E, N, B, R, S, G, C, D/K, J, T, E, N, B, R, S, L, C,

D Thermocouples

100Ω /1000Ω Platinum RTD

1,000Ω /10,000Ω Resistance

RAMP FUNCTION: Included.

FEATURES

Combination calibrator, thermometer and datalogger.

Function selection and numeric data entered via 12 keyswitch color coded keypad.

Keyswitches have tactile feedback.

5 digit LCD includes annunciators for operating modes.

Up to 11 thermocouple types, 2 RTD types, and thermistor.

1° or 0.1° resolution over temperature range of each sensor.

°F and °C scales.

Reading hold mode.

10 memory locations for saving meter readings and/or calibrator outputs.

Step mode for quick sequential recall of calibrator outputs from memory.

Manual/automatic ramping for testing controller setpoints.

Conforms to ITS-90thermocouple tables.

Dust proof, splash proof, drop proof construction.

Built-intilt stand/hanger for bench use or hands free field measurements.

User friendly programming.

Retains data and programming, even when turned off.

Performs diagnostic tests and indicates fault conditions.

Low battery and open sensor indications.

MANUAL ADDENDA

Improvements or changes to this manual will be explained on an addendum included with the instrument. All change information should be incorporated immediately into the appropriate places in the manual.

6

UNPACKING YOUR UNIT

Remove the Packing List and verify that you have received all equipment. If you have any questions about the shipment, please call the OMEGA Customer Service Department at 1-800-622-2378or (203)359-1660.

When you receive the shipment, inspect the container and equipment for any signs of damage. Note any evidence of rough handling in transit. Immediately report any damage to the shipping agent.

NOTE: The carrier will not honor any claims unless all shipping material is saved for their examination. After examining and removing contents, save packing material and carton in the event reshipment is necessary.

Make sure that you have the following items in the packing box.

1 CL20 Series Calibrator and Holster.

1 Operator’s Manual

1 NIST Certificate

1 Accessories Kit

SAFETY INFORMATION

SAFETY SYMBOLS AND TERMS

The symbol ! on the instrument denotes that the user should refer to the operating instructions.

The WARNING used in this manual explains dangers that could result in personal injury or death.

The CAUTION used in this manual explains hazards that could damage the instrument.

SAFETY PRECAUTIONS

WARNING

These instruments are intended for use by qualified personnel trained in the safe operation of electronic testing equipment. Read the instruction manual thoroughly before using, to become familiar with the instrument's operations and capabilities.

7

WARNING

Do not touch a temperature probe sheath when measuring excessively high or low temperatures, or toxic substances.

WARNING

Do not attempt to measure temperatures beyond the range of the probe being used. Probe damage or personal injury could result from exceeding a probe's maximum temperature rating.

WARNING

The American National Safety Institute (ANSI) states that a shock hazard exists when probes or sensors are exposed to voltage levels greater than 42VDC or 42V peak AC. Do not use this instrument where voltages at the measurement surface exceed these levels.

WARNING

Do not substitute a metal part for the nylon screw in the rear case. Doing so will degrade electrical isolation of the case.

WARNING

The battery is accessible through a cover on the back of the instrument. To avoid electrical shock hazard, disconnect all temperature probes and sensors and turn the unit off before removing the cover.

WARNING

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

CAUTION

Avoid making sharp bends in probe or sensor lead wires. Bending lead wires at a sharp angle can damage the wire causing probe failure.

8

CAUTION

Keep inputs electrically isolated from outputs. Do not connect an external voltage source between the two connectors, and avoid any external electrical pathways between input and output (T2 & T1).

Failure to do so will disturb meter readings and calibrator output levels. Damage to the instrument is also possible.

Where the meter and calibrator connectors are simultaneously wired into a system lacking the above isolation, it is necessary to use an "ungrounded" (i.e. electrically isolated) probe at the thermometer input.

BATTERY INSTALLATION/REPLACEMENT

A 9V alkaline battery is supplied with the instrument but not installed. Read the following installation instructions before attempting to install or remove the battery. Replacement batteries should also be alkaline types.

WARNING

Turn the unit off and disconnect any input/output connections before replacing the battery. Put the cover back into place on the battery compartment before resuming use of the instrument.

1.Remove the cover from the battery compartment by sliding it off in the direction of the arrow located on the battery cover.

Figure 1. Battery Installation

9

2.Remove the old battery by lifting the battery extractor loop.

3.Place the new battery in the battery compartment. Be sure to observe proper polarity.

4.Re-installthe battery cover before resuming use of the instrument.

NOTES:

Less than 10% of battery life remains when the BAT annunciator turns on.

When the battery is excessively discharged, the display is blanked.

If the instrument is going to be stored for a long period of time or in a high temperature environment, remove the battery to prevent leakage damage.

After a new battery is installed, allow approximately 5 seconds for display turn-onthe first time the unit is turned on. During this period, microcomputer initialization is performed.

MEMORY BACKUP

During battery replacement, the contents of user-programmedmemory (data, operating modes, etc.) can be saved. Prior to removing the old battery, turn off the instrument, and connect anHH22-ACbattery charger. Then exchange batteries, and disconnect the battery charger. Do not leave the battery charger connected to instruments withnon-rechargeablebatteries.

OPERATION WITH RECHARGEABLE

BATTERY

HH22-AC provides a9-voltNi-Cdbattery and recharger suitable for use with the unit. This battery provides3-4hours of continuous operation. This duration can be extended to several days by operating simultaneously from both the battery and recharger.

Turn off the instrument to recharge the battery. Allow 7 hours to fully recharge the battery. Then unplug the recharger to avoid overcharging.

10

OPERATING INSTRUCTIONS

1. DIAGNOSTICS AND ERROR MESSAGES

Unit self-diagnosticsprovide fault condition readouts which are described below:

PROBLEM:

LIKELY CAUSE:

 

Blank display, unit does not

(1)

Improper battery installation.

power-up.

(1)

Check battery polarity.

 

(2)

Dead battery.

 

BAT Annunciator.

(1)

Low battery voltage, install a new

 

 

battery. If problem persists, con-

 

 

sult factory.

 

Display reads OPEN.

(1)

No thermocouple, RTD or thermis-

 

 

tor is plugged into the meter input.

Display reads E1 momentarily.

(1)

This indicates that an invalid key-

 

 

pad entry has been made. Review

 

 

keystroke sequence, or consult

 

 

manual for input instructions.

Display reads E2 momentarily.

(1)

Attempt made to activate non-

 

 

installed

ramp function. NOTE:

 

 

RAMP

Function

enabled on

 

 

Models CL25 and CL27 only.

Display reads HI.

(1)

Meter-modeinput-temperature

 

 

exceeds rating of selected sensor.

 

(2)

Calibrator-mode

keypad-entry

 

 

exceeds rating of sensor type.

Display reads LO.

(1)

Meter-modeinput-temperaturetoo

 

 

low for accurate measurement.

 

(2)

Calibrator-modekeypad-entrytoo

 

 

low for accurate simulation.

2. INITIAL TURN ON

Turn on the instrument by depressing the ON-OFFkeyswitch once (Figure 2). Atpower-up,the unit first performs a display test. All segments and annunciators of the liquid crystal (LCD) are momentarily turned on for visual confirmation by the user (Figure 3).

NOTE: In case of missing orpoor-contrastsegments, contact factory.

11

Figure 2. Keypad

Figure 3. Display Test

If the unit is turning on for the first time after a new battery is installed, it will automatically default to the METER mode (ie. temperature measurement operation). It also defaults to K-typethermocouples, and °F readings with 0.1° resolution. The corresponding LCD annunciators are enabled:

12

METER: (unit functioning as a thermometer)

K:(K-typethermocouple)

°F:

(Fahrenheit readings)

OPR:

(Instrument is operational)

If no input thermocouple is connected to the unit at this time, the numeric segments will indicate "OPEN".

Plugging a thermocouple into the meter jack (connector T2, on the top right side) will give actual thermocouple temperature readings.

NOTE: To obtain full accuracy, allow1-2minutes after connecting a thermocouple plug, for thermal setting.

If the instrument is to be used as a thermometer or ohmmeter, refer to the Meter Mode Operation section for detailed instructions. For use as a tem- perature-calibratoror ohms simulator, refer to Calibrator Mode Operation.

3. METER MODE OPERATION (Thermocouples)

Set-Up:

1.Turn on instrument by depressing the ON/OFF key.

2.Check that the BAT annunciator turns off following the power-upLCD test. If it does not turn off, less than 10% of battery remains. Refer to Battery Installation/Replacement instructions.

3.If the meter is already in the METER mode, the METER annunciator will be on. Otherwise the calibrator mode is enabled and the CALIB annunciator is on. Depress the METER key to return to meter mode.

4.Connect an input thermocouple (TC) to connector T2. Select the appropriate TC Type with the select-key.A display annunciator will indicate the selectedTC-type.

NOTE: Space and legibility constraints on the display preclude the use of dedicated annunciators for the less common tungstenrhenium thermocouple types (G, C & D). Instead, these types are annunciated momentarily on thealpha-numericdisplay when first selected. Both T and R annunciators remain on to indicate aTungsten-Rheniumselection. To recall the actual G, C, D selection, turn the unit off, then on again for another momentary readout.

5.Select temperature scale with °F/°C key. The corresponding annunciator is enabled.

13

6. Select display resolution with 0.1°/1° key.

NOTE: Set-upis retained duringpower-off.

Hold:

Meter readings can be put on hold at any time by depressing the HOLD key. At this time, the HOLD annunciator turns on, the reading is frozen, and all keys (except ON/OFF and HOLD) are locked out. Depress the HOLD key again to return to real-timereadings, andre-enablethe keypad.

4. METER MODE OPERATION (RTD, Thermistor & Ohms)

Set-Up:

1.Connect a sensor or unknown resistance to the instrument as shown in Figures 4, 5, or 6.

The 2-wireconfiguration is simplest, but includeslead-wireresistance in the measurement.2-wiremeasurements are generally limited to high resistance sensors (e.g.1000-ohmRTDs,2252-ohmthermistors).

Figure 4. 2-WireResistance Measurement

Figure 5. 3-WireResistance Measurement

14

WHT

BLK

GRN

RED

Figure 6. 4-WireResistance Measurement

Lead resistance errors are compensated for in 3-wireconfigurations. However full compensation requires equal resistance in each lead. This configuration is common with100-ohmRTDs.

In 4-wireconfigurations, accuracy is unaffected by lead resistance, and resistance differences between leads.

NOTE: These instruments measure input voltages on all 4 terminals, and are able to distinguish between2-4and3-wirehookups. Switching between these measurement modes is automatic.

2.Set instrument to METER mode.

3.Use the sensor-selectkey to set the instrument to the appropriate function and range.

NOTE: Due to limited display area, 100Ω and 1000Ω RTD's are indicated on the display by a momentary readout of"RTD-100"(or"RTD-1000")when first selected.

Thermistors are identified by a momentary alpha-numericreadout of"Y-400"(signifying YSISeries-400type thermistor).

Any of these readouts can be recalled by turning the unit off and back on.

5. DATA LOGGING AND RECALL

Operating as a meter, the unit can save and recall up to 10 readings (each with independent parameters: eg. °F/°C, TC-typeand resolution) in random access memory.

15

To Save Readings:

1.While in the METER OPR mode, depress the STORE key. Note that the OPR annunciator is replaced by STO.

2.Next depress one of the memory location numbers (keys 0, 1, . . ., 9). The corresponding memory annunciator turns on and the meter returns momentarily to the OPR mode, displaying thermocouple temperature.

eg. STORE 7

NOTES:

The enabled location annunciator indicates that the meter reading at the instant that the location number key was hit, was stored in memory.

When data is stored in a location already filed with data, the new data replaces the old.

Stored readings are retained during power-off.

To Recall Readings:

1.While in the METER OPR mode, readings stored earlier can be displayed by first depressing the RECALL key. Note that the OPR annunciator is replaced by RCL, and all memory location annunciators are blanked.

2.Next depress the keypad number corresponding to the desired location. Note that the annunciator for this location turns on, and the memory contents are displayed.

3.Several stored readings can be randomly recalled by a key sequence such as:

T1

 

T2

Calibrator

 

Thermometer

(output)

 

(input)

 

 

 

Figure 7.

16

eg. RECALL 3 eg. RECALL 5eg. RECALL 2eg. etc.

4.To return the meter to the operate mode, depress OPR after recalling the last reading. All active location annunciators will turn on again, together with the OPR annunciator.

NOTE: Recalling data from unused (ie, empty) locations will give a zero reading.

To Erase Data Locations (Meter Mode):

1.Individual data locations can be erased by recalling the location to be cleared, followed by a CLEAR key input. Note that the annunciator for the cleared location is turned off, and the meter returns to OPR.

eg. RECALL 3 eg. CLEAR

NOTES: There is no need to clear a location if new data is ready for saving in this location. Just STORE the new data. It will write over and delete the old.

6. CALIBRATOR MODE OPERATION (Thermocouples)

Set-Up:

1.Turn on the instrument by depressing the ON/OFF key.

2.Check that the BAT annunciator turns off after display check. If not, refer to Battery Installation/Replacement instructions.

3.When operating as a calibrator, the display indicates CALIB. Should the instrument be in the METER mode, hit the CALIB key to change to the calibrator function.

4.Select the thermocouple type that will be used.

NOTE: Space and legibility constraints on the display preclude the use of dedicated annunciators for the less common tungstenrhenium thermocouple types (G, C, & D). Instead, these types are annunciated momentarily on thealpha-numericdisplay when first selected. Both T and R annunciators remain on to indicate aTungsten-Rheniumselection. To recall the actual G, C, D selection, turn the unit off, then on again for another momentary readout.

5. Select the desired temperature scale (°F/°C key).

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6. Select the resolution desired (0.1°/1° key).

NOTE: With 1° resolution, one less key stroke will be required to enter calibrator output temperatures via the keypad.

7.The unit accepts numeric inputs by first changing the keypad to its num- ber-entrymode (NUM) by depressing the CHANGE/ENTER key once. The numeric display will flash, the OPR annunciator will turn off, and the NUM annunciator will turn on. Key in desired temperature value, most significant digit first. After the desired temperature value is keyed in, hit CHANGE//ENTER to return to OPR mode.

7.To enter a value of 212° with 0.1° resolution, the following keystrokes are used:

CHANGE/ENTER, 2, 1, 2, 0, CHANGE/ENTER

NOTES:

Invalid numeric entries (eg. a temperature beyond the span of the selected TC type) will cause a corresponding error code to be displayed.

To enter negative (ie. minus) temperatures, hit the –0key first when in the NUM mode. The first hit on this key enters the negative sign. Subsequent hits enter zeros.

To correct a numeric entry while in the NUM mode, hit the CHANGE/ENTER key twice. This will return number entry to the beginning of a new number.

To return the calibrator output to 0° while in the OPR mode, hit the CLEAR key.

The unit can be used as a convenient °F to °C or °C to °F calculator.

For example, to convert 77°F to a Celsius reading, go to the CALIB OPR mode, enter the reading to be converted, and change scale.

eg. °F

eg. CHANGE/ENTEReg. 77

eg. CHANGE/ENTER

eg. °C (Display reads 25°C)

7. CALIBRATOR MODE OPERATION (RTD, Thermistor & Ohms)

Set-Up:

1.Connect measurement equipment under test (eg. RTD thermometer, ohmmeter, etc.) to the instrument as shown in Figures 8, 9, or 10.

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