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Reference Manual
110A
Digital Thermometers
Instruction Manual
MODELS 868 and 869
Instruction Manual
PN# 869-901-01CD
Publication Date: May 2017
REV. G
NOTE: This User's Manual was as current as possible when this product was manufactured. However, products are
constantly being updated and improved. To ensure you have the latest documentation, refer to
www.tegam.com
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Summary of Contents for Tegam 868
- Page 1 110A Digital Thermometers Instruction Manual MODELS 868 and 869 Instruction Manual PN# 869-901-01CD Publication Date: May 2017 REV. G NOTE: This User’s Manual was as current as possible when this product was manufactured. However, products are constantly being updated and improved. To ensure you have the latest documentation, refer to...
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Page 2: Table Of Contents
110A SPECIFICATIONS .................................... 1 GENERAL INFORMATION ................................3 MANUAL ADDENDA ..................................3 OPTIONAL ACCESSORIES ................................3 PREPARATION FOR USE ................................4 BATTERY INSTALLATION/REPLACEMENT ............................5 OPERATION ....................................6 SAFETY SYMBOLS AND TERMS ..............................9 VERIFICATION PROCEDURE ................................ 10 CALIBRATION ....................................12 GENERAL INSTRUMENT CALIBRATION ............................ -
Page 3: Specifications
MAXIMUM LEAD RESISTANCE (each lead): 4 Wire: 50 ohms 3 Wire; 10 ohms SENSOR CURRENT: 500A maximum. MODEL 868 and 869 GENERAL SPECIFICATIONS (unless specified): DISPLAY: 3 1/2-digit LCD, 13mm (0.5") height. Polarity and decimal point indication. CONVERSION RATE: 1.5 readings per second. - Page 4 110A MAXIMUM COMMON MODE VOLTAGE: 30VDC (42V peak AC). COMMON MODE REJECTION: Less than 0.001°/ volt at DC, 50 Hz and 60 Hz. (100 unbalance, LO driven) ENVIRONMENTAL LIMITS FOR OPERATING: -10° to 50°C (14° to 122°F), less than 80% relative humidity up to 35°C (95°F). Reduce R.H. Limit by 3% from 35° to 50°C (1.7% R.H./°F from 95°...
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Page 5: General Information
110A GENERAL INFORMATION The TEGAM Models 868 and 869 are handheld digital thermometers designed to use 100 platinum RTD temperature sensors for high accuracy and long-term temperature stability. The Model 868 has two switch-selectable ranges: from -199.9°F to + 199.9°F with 0.1°F resolution, and between -360°F and +1100°... -
Page 6: Preparation For Use
Model 8660 Tilt Stand/Belt Clip provides a convenient method of elevating the instru- ment to a convenient viewing height. The Model 8660 also includes a belt clip. Model 8668 Soft Carrying Case provides protection for the Model 868 or 869 during transportation or storage. -
Page 7: Battery Installation/Replacement
110A BATTERY INSTALLATION/REPLACEMENT A 9V battery is supplied with the unit. To install or replace the battery, proceed as follows: WARNING Turn off the power and disconnect the temperature probe before removing the back cover to install or replace the battery. Replace the back cover before resuming use of the instrument. -
Page 8: Operation
(Over-range indicated by “1” followed by blanked digits) ON-OFF/Range Switch Model 868 Model 869 Figure 1. Control and Display Nomenclature 1. Connect a temperature probe to the input connector on the top of the instrument. Use one of the probes described in the accessories section; or install a 4-wire connector on any 100 ohm platinum RTD probe using the information in Figure 2. - Page 9 110A C. Re-install the rear cover and tighten the retaining screws. REAR VIEW REAR VIEW Figure 2. 100 Ohm Platinum RTD Connections Pin 1 Source + Pin 2 Sense + Pin 3 Source - Pin 4 Sense - NOTE Use only 100 platinum RTD sensors that conform to the DIN 43 760 standard (alpha=0.00385).
- Page 10 RMS, 42V peak above earth ground, or a shock hazard may result. 5. Take the reading from the display. The reading is in °F (Model 868) or °C (Model 869). A leading minus sign indicates a negative temperature reading. An over range a "1"...
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Page 11: Safety Symbols And Terms
110A The operating temperature of the instrument itself can affect accuracy. The accuracy figures given above are for an instrument operating in the range of 18°C to 28°C (65°F to 82°F). For operating environments between -10°C and 18°C (14°F and 65°F) and between 28°C and 50°C (82°F and 122°F), a temperature coefficient of less than ±0.015°C/°C (±0.015°F/°F) can be expected. -
Page 12: Verification Procedure
110A WARNING The information in this section is intended only for qualified service personnel. Before removing the back cover to service the instrument, disconnect the temperature probe. VERIFICATION PROCEDURE Performance verification is performed by connecting known, precise resistors to the instrument in place of a temperature probe and checking to see that the displayed reading falls within a prescribed range. - Page 13 NOTE If the instrument is still under warranty (less than 12 months since the date of shipment), and it does not meet specifications after calibration, contact your TEGAM Dis- tributor or the factory to determine the correct course of action.
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Page 14: Calibration
110A Table 1. Performance Verification Procedure (Cont.) Model 869 Range Resistance Value Allowable Reading (65°F to 82°F) 630°C 9.90 -222 to -218 200°C 60.26 -100.3 to -99.7 200°C -0.3 to +0.3 100.00 200°C 138.51 99.7 to 100.3 200°C 174.01 ... -
Page 15: General Instrument Calibration
Figure 5. 6. If probe compensation is required, proceed to the next paragraph; otherwise dismantle the test fixture, set the 3-WIRE/4-WIRE jumper to the correct position and replace the back cover. Table 2. Calibration Procedure MODEL 868 Step Adjustment Potentiometer Range... - Page 16 4. Allow 20 minutes for the test fixture temperature to stabilize. With the Model 868 on the 200°F range, adjust R104 for a reading of 32.0 on the display. For the Model 869, R104 should be adjusted for a reading of 00.0 with the instrument on the 200°C range.
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Page 17: Warranty
Warranty TEGAM, Inc. warrants this product to be free from defects in material and workmanship for a period of one year from the date of shipment. During this warranty period, if a product proves to be defective, TEGAM Inc., at its option, will either repair the defective product without charge for parts and labor, or exchange any product that proves to be defective. - Page 18 110A TEGAM is a manufacturer of electronic test and measurement equipment for metrology, calibration, and production test. We also provide repair, calibration, and other support services for a wide variety of test and measurement equipment including RF power sensor calibration systems, RF attenuation...