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Summary of Contents for Precision 28208A
- Page 1 Installation and Programming Instructions Precision 28208A Octal Thermocouple Conditioner with Enhanced Accuracy May 14, 2019 Rev A Precision Filters, Inc. 240 Cherry Street Ithaca, New York 14850 www.pfinc.com I SO 9 00 1 C ER TIFIE D QUALI T Y...
- Page 2 Precision Filters’ Control GUI Software Copyright © 2019 Precision Filters, Inc., All Rights Reserved. Trademark Information The following terms and names are trademarks of Precision Filters, Inc. in the United States and/or other countries: • Balanced Constant Current and BCC •...
- Page 3 Do not proceed beyond a WARNING statement until the conditions are fully understood and met. Precision Filters, Inc. 28208A Installation and Programming Instructions Rev. A...
- Page 4 Setup and Installation section of this manual. Do not install substitute parts or perform any unauthorized modification to the product. Return the product to Precision Filters, Inc. for service and repair to ensure that safety features are maintained. See the “Support and Service” supplement in this document for information on how to contact Precision Filters.
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Page 5: Table Of Contents
1.3 28208A General Characteristics ........ - Page 6 4.4 28208A LCS Commands ........
- Page 7 5.2 Service and Repair ..............41 Precision Filters, Inc. 28208A Operation and Maintenance Instructions Rev. A...
- Page 8 28208A Table of Contents Page vi 28208A Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...
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Page 9: 28208A General Information
28208A card and the 28208A-1-ITB Isothermal Block. Section 2, 28208A Setup and Installation, contains site preparation, card configuration, and installation instructions, as well as input and output pin assignments for the 28208A card and the 28208A-1-ITB Isothermal Block. -
Page 10: 28208A Overview
It provides eight channels of conditioning for thermocouples or other DC and AC voltage inputs. The 28208A is ideal for applications such as static (DC) or dynamic (AC) temperature measurement and as a low-level DC or AC filter amplifier (<1 mV to 10 V inputs). -
Page 11: Isothermal Block
The block temperature is interrogated once every 10 seconds. To remove errors caused by the bowing, a microcomputer in the 28208A sets a cold junction compensation DAC by calculating the correction voltage for the measured temperature based on NIST coefficients. -
Page 12: Sensor And Cable Health
TC level (100x or 1,000x) Note: Overall accuracy of R, S & B type Thermocouples is highly dependent on the 28208A’s analog reference point compensation. If the analog reference point compensation is used overall accuracy will depend on changes between ambient temperature during auto gain adjust (Tadj) and Temperature of use (Tuse) and is given by : Type R and S: 0.02% +0.25°C * (T(use)–T(adj)) -
Page 13: Test Mode Functions
The ITB block correction voltage is set to 0 V when the test input mode is activated. 10 VDC Cal Mode A switch at the input connects a precision 10 VDC calibration reference to the input amplifier. Overload Detector Offset Correction... -
Page 14: Mainframe
28208A General Information Page 6 1.2.5 Mainframe The 28208A is a member of the Precision 28000 family of signal conditioners, which consists of five unique mainframes: • Two 16-card slot mainframes • One 8-card slot mainframes • One 4-card slot mainframe •... -
Page 15: Accessories
The Isothermal Block can be located away from the 28000 system useing extension cables. CB-28208A-ITB-10 is a 10-foot extension cable that connects the isothermal block directly to the 28208A card. Other lengths up to 50 feet are available, please consult with Precision Filters. - Page 16 28208A General Information Page 8 This page intentionally blank. 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A...
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Page 17: 28208A Setup And Installation
This section describes the site preparations that must be made before installing the cards and the Isothermal Block. 2.2.1 Power Requirements The 28208A card receives all power from the 28000 frame. The Isothermal Block does not require any additional power. 2.2.2 Environmental Requirements The system must be installed and operated in an area that meets and can maintain the environmental specifications listed in Table 4. -
Page 18: Physical Requirements
2.2.3 Physical Requirements Up to sixteen 28208A cards can be installed in a 28016-M3 or in a 28016-M5 frame, up to eight cards can be installed in a 28008-M3/M5 frame, up to four cards can be installed in a 28004-M3/M5 frame and up to two cards can be installed in a 28002 frame. Connectors on the 28208A card extend through openings at the rear of the mainframe to provide the card’s... -
Page 19: Circuit Cards
ESD. 2.3.3 Isothermal Block The 28208A-1-ITB Isothermal Block is sensitive to electrostatic discharge (ESD). The unit should be handled only at a properly grounded static workstation with a grounding strap for the operator and a grounded dissipative mat as the work surface. Failure to observe precautions may damage sensitive components. -
Page 20: Storage, Transport, And Shipment
When shipping system components use the original packaging materials to ship system com- ponents. A new container can be purchased from Precision Filters, Inc. The environmental conditions in Table 5 must be maintained. -
Page 21: 28208A Output Shield Option
The factory default is open. To set the output to shield, slide switches S1-1 through S1-8, on switch package S1 to ON. Switch S1 is located next to the output connector on the 28208A card (see Figure 2). Table 6 list the channel switch assignments. Table 6 Table Output Shield Channel Switch Assignments... -
Page 22: Install Cards
Failure to do so may damage sensitive components. A 28208A card can be installed in any open card slot. Before inserting cards check that any cables or cable adapters attached to the card slot rear panel are compatible with the 28208A card. -
Page 23: Removing Cards
Press down on the card extraction handle to release the card from the backplane connector. Step 3 Slide the card out of the mainframe. Step 4 Insert the card in a protective static-shielding bag until it is installed in a mainframe. Precision Filters, Inc. 28208A Installation and Programming Instructions Rev. A... -
Page 24: Address Conventions
• 28016-M5, where CARD n = 0 to 15 • 28008-M3/M5, where CARD n = 0 to 7 • 28004-M3/M5, where CARD n = 0 to 3 • 28002-M5, where CARD n = 0 to 1 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 25: Install Cables
Page 17 Install Cables This section provides information about installing the 28208A input and output connector ca- bles. One high-density 26-pin connector for each of the input and output connections extends through an opening in the rear panel of the mainframe. Figure 4 shows the location of the connectors on the card and the pin numbering. -
Page 26: Input Connections
The 28208A-1-ITB isothermal block extension cable (CB-28208A-ITB-10) connects the isothermal block and to the 28208A input connector. Custom cable lengths up to 50 feet are available from Precision Filters. See Section 2.8, Isothermal Block Connections. -
Page 27: Isothermal Block Connections
28208A Setup and Installation Page 19 Isothermal Block Connections The 28208A-1-ITB Isothermal Block (ITB) is a rack-mountable reference junction for up a four 28208A cards (32 channels). CAUTION The 28208A-1-ITB Isothermal Block is sensitive to electrostatic discharge (ESD). When you are installing and connecting cables, the Isothermal Block and you must be properly grounded. -
Page 28: Isothermal Block Ground Terminal
2.8.3 Isothermal Block Ground Terminal CAUTION The 28208A-1-ITB Isothermal Block is sensitive to electrostatic discharge (ESD). The 28208A-1-ITB must be properly grounded thought the ground terminal or mounted in a grounded equipment rack. To ground the Isothermal Block either mount the unit to a grounded equipment rack or ground the unit using to ground terminal located on the rear panel, see Figure 6 for the location of the ground terminal. -
Page 29: 28208A Programming Instructions
Refer to the 28208A specification sheet for detailed information and specifications of the card. 3.1.1 Front Panel Indicators The 28208A card’s front panel contains 16 LEDs, two for each channel. These LEDs indicate an open thermocouple connection and/or an overload condition when they are on. 3.1.2... -
Page 30: Channel Identification Section
The fourth column displays the card model. To view the full model number, click the Card button in the Group Control section and the card number will display in the message window at the bottom of the GUI. 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 31: Channel Controls And Settings
Figure 8 Test Modes • RUN Run is the normal operating mode. The input source is the 28208A card’s input connectors. • TESTBUS Test Bus mode switches the channel input source to the system’s front panel Test connector. -
Page 32: Fault Detection
LED lights only when an overload condition is present and goes out after the overload condition is resolved. 3.2.3 Isothermal Block Present Indicator When an isothermal block is connected to the 28208A card, the PRESENT indicator (shown in Figure 10) is green. 3.2.4 Isothermal Block Temperature The Block Temp fields shows the temperature at the isothermal block in °C and are updated... -
Page 33: Thermocouple Type
3.2.5 Thermocouple Type Use the TC Type field (Figure 11) to set a channel’s thermocouple type. The 28208A card provides precise cold junction compensation for standard thermocouple types B, E, J, K, N, R, S, and T. Click the TC Type field and select the desired thermocouple type from the drop- down menu. -
Page 34: Gain And Reserve
3.2.6 Gain and Reserve The 28208A amplifier provides programmable gain. Use the GAIN and RES fields (Figure 12) to set and allocate channel gain between pre- and postfilter gain. Gain can be set to 1, 10, 100, or 1000. Reserve can be set to 1 or 10 to provide protection against out-of-band signals. -
Page 35: Cutoff Frequency
To bypass the filter, click in the BYP field (Figure 14) and select either ON (to bypass the low- pass filter) or OFF (to enable the low-pass filter). Figure 14 Filter Bypass Precision Filters, Inc. 28208A Operation and Maintenance Instructions Rev. A... -
Page 36: Auto Offset Adjust Options
28208A Programming Instructions Page 28 Auto Offset Adjust Options The 28208A auto-adjust options allow you to run two preprogrammed auto-adjust routines: All Gains Auto Offset Correct and All Current Gain Auto Offset Correct. Note: Each adjustment has the potential to alter channel settings that may have been validated previously by running the Factory Acceptance Tests, which are traceable to NIST. - Page 37 Red indicates that at least one failure occurred during the routine. Step 3 When to routine is completed, click the Done button to close the Auto Adjust panel and return to the GUI. Precision Filters, Inc. 28208A Operation and Maintenance Instructions Rev. A...
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Page 38: Go/No-Go Test
Figure 17 shows the Go/No-Go Test Selection panel. Figure 17 Go/No-Go Test Menu 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 39: Fat Testing
Page 31 FAT Testing Important note: In order to gain the full benefit of the high accuracy of the 28208A card, some consideration of ambient temperature effects must be taken while running the auto ad- justments and performing the factory acceptance test. It is very important that gain and offset adjustments be performed only after the 28000 internal temperature has stabilized in the same ambient conditions as it is intended to be used. -
Page 40: Automated Gain Adjustment
Depending on the initial gain error the adjust procedure can take up to 15 minutes per channel. When the gain adjustment is complete for all selected channels, the selected FAT tests will begin. 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 41: 28208A Lcs Commands
Refer to Section 2 of the 28000-LCS Programming Instructions manual for common LCS commands for the 28000 system and backplane interface card (BIF). Refer to the 28208A specification sheet for detailed information and specifications of the card. Precision Filters, Inc. -
Page 42: Communication Configuration
The terminal emulator program provides a terminal setup panel similar to the one shown in Figure 21. Select CR & LF from the Transmit drop-down menu; select Local Echo to have commands reflected in the control display. Figure 21 Tera Term Terminal Setup Panel 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 43: Lcs Command Format
“...” is the “and so on” or range operator, and the symbol “|” is the logical OR operator. 4.3.2 Command Status or Current Value Entering a keyword command followed by a return (Enter key) typically reports the status or the current value of the command. Precision Filters, Inc. 28208A Operation and Maintenance Instructions Rev. A... -
Page 44: 28208A Lcs Commands
Run, Test Bus, 10V CA and Short. Each input source option is described below: testmode:[run|testbus|10v_cal|short|?][,<chan_list>]; • Run Run is the normal operating mode. The input source is the 28208A input connectors. Format: testmode:run • Testbus Test Bus mode switches the channel input source to the system’s front panel Test connector. -
Page 45: Check Overloads (V)
Overload/Fault LED Display Open thermocouple connections and channel overload conditions are typically indicated by the 28208A front-panel LEDs. The ovld_disp command sets the display mode for the front panel channel fault LED indicators, or to return the function’s current setting. -
Page 46: Thermocouple Type
The ttype command sets or returns the current value of the thermocouple type for the speci- fied channel(s). ttype:[b|e|j|k|n|r|s|t|none|?][,<chan_list>]; The 28208A provides precise cold junction compensation for the standard thermocouple types B, E, J, K, N, R, S and T. The none operator sets the 29208A to function as low-level for filter/amplifier when cold junc- tion compensation is not required. -
Page 47: Gain
The typical small signal bandwidth is –3 dB, 10 kHz. 4.4.10 Filter Type The ftype command returns the filter type for the specified channel(s). ftype:[<value>|?][,<chan_list>]; The 28208A has BE4 4-pole low-pass Bessel filters. Precision Filters, Inc. 28208A Operation and Maintenance Instructions Rev. A... -
Page 48: 4.4.11 Auto Offset Adjust, Current Gain
Offsets drift with temperature, so warm up the system for about 30 minutes before running the routine. The offsetadjs_all:run command initiated a gain offset correction routine for all gains for one or more channels. offsetadj_all:run [,<chan_list>]; 28208A Installation and Programming Instructions Precision Filters, Inc. Rev. A... -
Page 49: Support And Service
Customer Service E-Mail: customer-service@pfinc.com Fax: 607-277-4466 Service and Repair If equipment is being returned to Precision Filters for service or repair, contact the factory for a Return Authorization Number. To obtain a Return Authorization Number, contact Precision Filters: Phone: (607) 277-3550... - Page 50 Support and Service Page 42 This page intentionally left blank. 28208A Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...
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