Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Tegam 865
Summary of Contents for Tegam 865
- Page 1 J a n u a r y 2 0 1 8 R e v G...
-
Page 2: Table Of Contents
Theory of Operation ....... . 14 Troubleshooting Guide .......16 © Copyright 1999 TEGAM, Inc. -
Page 3: Specifications
From –10° to 18° and 28° to 50°C; less than ±(0.06% rdg + 0.01°C)/°C. SENSOR VOLTAGE: 40mV rms maximum. MODEL 865 and 866 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 MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth. COMMON MODE REJECTION: Less than 0.01°/volt at DC, 50Hz and 60Hz. (2kΩ 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); linearly derate 3% R.H./°C from 35° to 50°C (1.5% R.H./°F from 95°...
-
Page 5: General Information
200 hours typical with a carbon- zinc battery. The Model 865 measures temperatures from –70°F to 300°F on two ranges. The 300°F range measures temperature from –70°F to 300°F with a resolu- tion of 1°F. -
Page 6: Optional Accessories
Model 8660 and a probe. PREPARATION FOR USE The Models 865 and 866 are supplied ready for use. To replace/install the battery, refer to the servicing information section. The thermometer is designed to work with any of the probes listed in the optional accessories section. -
Page 7: Operation
OPERATION Refer to Figures 1 and 2 for Models 865 and 866 control layouts. ENVIRONMENTAL CONDITIONS Operation of the Model 865 and 866 should take place at an ambient tem- perature which is stated in the specifications. 865 Operation 1. Turn power on by selecting the desired range. - Page 8 An open sensor is indicated by a reading on the display of between –100° and –199°. WARNING A shock hazard exists on the Model 865 input jack when probes or sensors are exposed to voltage levels greater than 42 volts peak to earth ground.
- Page 9 CAUTION Do not attempt to measure temperatures beyond the range of the probe being used. Probe damage may occur. Maximum probe temperatures are given in the optional accessories section. Safety Precautions: 1. Do not touch the probe tip when measuring excessively high or low tem- peratures.
-
Page 10: Servicing Information
A reading ascending to between 25°C and 40°C should be real- ized for the Model 866 and a reading of 77°F to 104°F should be realized for the Model 865 to confirm the functionality of the instrument. Accuracy Check 1. -
Page 11: Special Handling Of Static Sensitive Devices
CMOS devices are designed to function at high impedance levels. Normal static charge can destroy these devices. Table 2 lists all static sensitive devices for the Model 865 and 866. Steps 1 through 7 provide instructions on how to avoid damaging these devices. -
Page 12: Recommended Test Equipment
1. Turn the Model 865 or Model 866 on. 2. Connect the decade resistance box to the Model 865 or Model 866. Refer to Figure 3. Refer to Table 4 for Model 865 calibration. Refer to Table 5 for Model 866 calibration. -
Page 13: Disassembly Instructions
Table 5. Model 866 Calibration Step Range Input Adjustment Reading 150°C 7355Ω R111 00.0 ± 0 counts 150°C 152.8Ω R110 100.0 ± 1/2 counts 150°C 41.9Ω R112 150.0 ± 0 counts R110 and R112 are interactive. Repeat steps B and C until the results are repeatable. - Page 14 When reassembling the instrument, be sure to reinstall the switch cover. Common mode voltage may be present on the switch, creating a hazard if the cover is not reinstalled. CONNECTOR FRONT PANEL OVERLAY Figure 4. Models 865 and 866 Exploded View...
-
Page 15: Battery Installation/Replacement
BATTERY INSTALLATION/REPLACEMENT To install/replace the battery: 1. Remove the bottom cover of the instrument (refer to the disassembly instructions). WARNING Turn the instrument off and disconnect the input probe before removing the bottom cover. Reinstall the cover before resuming use of the instrument. 2. - Page 16 U104C during the phase is connected to REF LO on U102 by way of C106 and U103B (Refer to the Schematic Diagram 866-106 or 865- 106). The voltage that is applied to the input of U104A and across C111 is the difference of the output voltage of U104C and the voltage that was pre- sent on C106 during the signal phase.
-
Page 17: Troubleshooting Guide
To gain access to the PC board, refer to the disassembly instructions. Use the parts list, schematic diagram and component layout to identify parts and check point locations. This troubleshooting guide is used for both the Models 865 and 866. Complete the following voltage checks. DC Voltage Checks Required... - Page 18 1. Connect a stable input to the instrument under test. For example, 190°F for the Model 865 and 150°C for the Model 866. 2. Measure the voltage at U102 pin 31 (IN HI) and record the value. 3. Measure the voltage at U102 pin 30 (IN LO) and record the value.
- Page 19 MODEL 865 AND 866 PARTS LIST Circuit Schematic Desig. Description Location BA101 9V Alkaline Battery, NEDA 1604 C101 Capacitor Polypropylene, .047µF, 160V C102 Capacitor, .1µF, 50V, Ceramic C103 Capacitor, .1µF, 50V, Ceramic C104 Capacitor, .33µF, 20%, 63V, Metalized Polyester C105 Capacitor, .22µF, 20%, 63V, Metalized...
- Page 20 MODEL 865 AND 866 PARTS LIST (continued) Circuit Schematic Desig. Description Locationr R111* Pot, single Trn, 5K ohm, 10% R111** Pot, single Trn, 2K ohm, 10% R112 Pot, seal, 10 ohm, 10% R113 Resistor, 392k, 1%, 1/8W, Metal Film R114...
- Page 22 MODEL 866 SCHEMATIC DIAGRAM FOLD OUT OF 866-106...
- Page 24 MODEL 865 SCHEMATIC DIAGRAM FOLD OUT OF 865-106...
- Page 26 TEGAM, Inc. warrants the calibration of this product for a period of two years from date of shipment. During this period we will recalibrate any product that does not conform to the published accuracy specification.
- Page 27 TEGAM has grown through a healthy mix of new product development and acquisition. At TEGAM, we manufacture the standards that you have come to know and trust.