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Precision 28108 Installation And Programming Instructions

Octal-channel wideband bridge conditioner with constant voltage excitation
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Installation and Programming Instructions
Precision 28108
Octal-Channel Wideband Bridge Conditioner
with Constant Voltage Excitation
April 20, 2016
Rev. D
Precision Filters, Inc.
240 Cherry Street
Ithaca, New York 14850
www.pfinc.com
ISO
9001:2008
CERTIFIED QUALITY

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  • Page 1 Installation and Programming Instructions Precision 28108 Octal-Channel Wideband Bridge Conditioner with Constant Voltage Excitation April 20, 2016 Rev. D Precision Filters, Inc. 240 Cherry Street Ithaca, New York 14850 www.pfinc.com 9001:2008 CERTIFIED QUALITY...
  • Page 2 Precision Filters’ Control GUI Software Copyright © 2016 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: Table Of Contents

    2.5.1 28108 Conditioner Card Input Connections ........
  • Page 4 28108 Card Output Connector ........
  • Page 5 3.4.1 28108 Excitation Test ........
  • Page 6 6.2 Service and Repair ..............77 28108 Installation and Programming Instructions Precision Filters, Inc.

  • Page 7: 28108 General Information

    28108 card. Section 4, 28108 LCS Commands, is an extension of Section 2, 28000 LCS System Commands, of the 28000-LCS Programming Instructions manual. It describes the operation of specific 28108 card functions and commands using the LCS command set.

  • Page 8: 28108 Overview

    28016-M3 chassis or one 28016-M5 chassis, or up to 64 channels in one 28008-M3 chassis. In addition, the 28108 may be mixed with other conditioners in the 28000 family to meet your unique signal conditioning requirements.

  • Page 9: Balanced Voltage Excitation

    28108 General Information Page 3 Other features of the 28108 include a test input for injection of calibration signals into the channel input and a monitor output that allows for convenient monitoring of any channel out- put via a single BNC on the 28000 chassis.

  • Page 10: Input Stage

    1.2.2 Input Stage The 28108 input stage has 100 dB of common-mode rejection, low DC drift, and low noise. A programmable switch at the input stage is provided to connect the amplifier to the 28000 system test bus. The test bus is used to inject signals for performance verification. In addi- tion, the excitation supply may be connected to the input stage for direct verification of the excitation supply level.

  • Page 11: 28108 Features

    • 2° phase matching between any channels • Overload detection • Precise automatic calibration • Auxiliary front panel output connection to support the use of custom output modules (for cards without Option 4) Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 12: Specifications

    Excitation Monitor (Standard) Excitation Monitor: Under GUI control, the amplifier input is switched from the bridge to the excitation supply to monitor the excitation voltage. Excitation monitor gain is x0.5. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...
  • Page 13 Test input allows for injection of a test signal. An external test signal or the 28000-?-TEST test system may be connected at the rear panel. Refer to the 28000-?-TEST test system specification for more information. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...
  • Page 14 Stability: 50 ppm/ °C of setting Auto Suppress Mode: A programmable DC offset derived from a precision 10 V reference is injected at the channel input stage to suppress the gage DC operating voltage. Manual and automatic suppression modes are supported.
  • Page 15 With high-gain signal conditioning, this can be troublesome if large signal swings on input or output cabling cross-couple to other channels. The 28108 Mute control places the channel in the quietest operational state to minimize system noise in the event of a failed sensor.
  • Page 16 Amplitude Match: ±0.1 dB max, DC to 0.8 Fc ±0.2 dB max, 0.8 Fc to Fc Phase Match: ±1° max, DC to 0.8 Fc ±2° max, 0.8 Fc to Fc 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...
  • Page 17 28000 card models. Flat Mode Low-Pass Filters Precision LP4F flat mode characteristics are specified to have outstanding passband flatness equivalent to the Butterworth yet deliver very sharp roll-off characteristics.
  • Page 18 Front Panel Outputs (Option 4): DC-coupled single-ended output available at the front panel of the 28108 card, allowing the 28108 card to be used in the 28016-M3 or 28008-M3 chassis. Note: For applications where multiple independent buffered outputs are required, Option 4 should not be used.
  • Page 19 28108 outputs. 28016-M3 or 28008-M3: The 28108 card must be configured with Option 4 when used in the 28016-M3 or the 28008-M3 chassis. The eight 28108 outputs are available on 26-pin D connectors that are integral to the 28108 card front panel (Option 4).

  • Page 20: 28108 General Characteristics

    Input Mating Connectors The input connectors are integral to 28108 cards. Cutouts on the 28000 frames allow the input connector to pass through the rear I/O panel and to mate directly with the input cables. Two 26-pin high-density D connectors are utilized for the eight inputs (four inputs per connector).

  • Page 21: Output Mating Connectors

    28016-M3 and 28008-M3 Chassis The eight channel outputs are available on a 26-pin D connector on the 28108 card front panel (Option 4). Note: The 28108 card must be configured with Option 4 when used in the 28016-M3 or 28008-M3 chassis.
  • Page 22 28108 General Information Page 16 This page intentionally left blank. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 23: 28108 Setup And Installation

    Page 17 28108 Setup and Installation Introduction This section contains instructions for preparing and installing the 28108 card for use with Precision Filters System 28000 frames. Before installing cards in your system, read Section 2, Site Preparation and Installation of the System 28000 Operation and Maintenance Instructions manual to become familiar with the procedure.

  • Page 24: Unpacking

    If the shipping container has been damaged in any way, have the carrier’s agent present when the equipment is unpacked. If the equipment is damaged, file a claim with the carrier and forward a copy to Precision Filters. Precision Filters will notify you of the disposition of the equipment and will arrange for repair or replacement without waiting for a settlement of the claim against the carrier.

  • Page 25: Storage, Transport, And Shipment

    2.3.3 Shipment Requirements Always use the original packaging materials to ship system components. A new container can be purchased from Precision Filters. The environmental conditions described in Table 2 must be maintained during shipment. Precision Filters, Inc. 28108 Installation and Programming Instructions...

  • Page 26: Install Cards

    Failure to do so may damage sensitive components. 28108 cards can be installed in any card slot: J0 through J15 in a 16-card mainframe and J0 through J7 in an 8-card mainframe (if the correct cable or cable adapter is attached to the rear panel).

  • Page 27: Install Cables

    • 28108 output signal cable 2.5.1 28108 Conditioner Card Input Connections Figure 3 illustrates the 28108’s rear-panel input connectors, and Table 3 describes the input connector pin assignments. Various optional connections are described and illustrated in this section. Pin 26...

  • Page 28: Input Cabling And Input Shielding

    For full-bridge measurements using a 4-wire configuration, the 28108 connections should be made as shown in Figure 4. Note: To set up the 28108 for 4-wire full bridge measurements, you must set the excitation sense to INSTRUMENT in the GUI or LCS.

  • Page 29: 28108 Full-Bridge 6-Wire Connections

    Figure 5 shows the 6-wire configuration that utilizes the + and – SENSE leads. Note: To set up the 28108 for 6-wire full-bridge measurements, you must set the excitation sense to GAGE in the GUI or LCS.

  • Page 30: Other Bridge Input Configurations Using External Completion Resistors

    Page 24 Other Bridge Input Configurations Using External Completion Resistors The 28108 does not provide bridge completion; however, the user may wish to provide exter- nal completion resistors for quarter- and half-bridge configurations. To minimize interfering noise sources, it is recommended that the completion resistors be located as close as possible to the active gage to keep the circuit physically balanced.

  • Page 31: Programmable Excitation

    30 mA; exercise care in setting the excitation voltage so as to not exceed this cur- rent limit. The 28108 GUI has an indicator to show when a channel’s excitation supply is in current limit or has reached an internal overtemperature condition. The current limit or over- temperature status may be interrogated remotely via the Ethernet interface.

  • Page 32: 28108 Card Output Connector

    28108 Setup and Installation Page 26 The 28108 card must be configured with Option 4 when used in the 28016-M3 or 28008-M3 chassis. The eight channel outputs are available on the 26-pin D connector on the 28108 card front panel (Option 4).
  • Page 33 Pin 1 Figure 8 Front-Panel Output Connector (Option 4) Table 5 describes the rear panel output connector pin assignments for the 28108 card installed in a 28016-M5 chassis (without Option 4). Table 5 28108 Conditioner Card without Option 4 Output Connections...

  • Page 34: 28004-M3/M5 4-Slot Mainframes

    PRIMARY POWER SWITCH/CONNECTOR J201 J102 CHASSIS SIGNAL GROUND GROUND J403 J500 J501 J203 J103 50-Pin Output 26-Pin Output Connector J300 Connectors J400 ñ J403 Figure 9 28004-M3/M5 Output Connector Pin Assignment 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 35: 28008-M3/M5 8-Slot Mainframes

    J300 and J301 26-Pin High-Density Output Connectors 18 26 J400 and J407 J403 J402 J401 J400 J300 J502 J407 J406 J405 J404 J301 Figure 10 28008-M3/M5 Output Connector Pin Assignment Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 36: 28016-M3 16-Slot Mainframes

    J301 J300 J500 J115 J114 J113 J112 J111 J110 J109 J108 J107 J106 J105 J104 J103 J102 J101 J100 28016-M3 Output Connectors J300-J303 Figure 11 28016-M3 Output Connector Pin Assignments 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 37: 28016-M5 16-Slot Mainframes

    J200 J502 J500 J115 J114 J113 J112 J111 J110 J109 J108 J107 J106 J105 J104 J103 J102 J101 J100 28016-M5 Output Connectors J300-J315 Figure 12 28016-M5 Output Connector Pin Assignments Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...
  • Page 38 SLOT J15, CHAN 1 SLOT J7, CHAN 1 SLOT J15, CHAN 2 SLOT J7, CHAN 2 SLOT J15, CHAN 3 SLOT J7, CHAN 3 * 28004-M3/M5 uses only connector J300 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...
  • Page 39 CH 11 High CH 12 High CH 13 High CH 14 High CH 15 High CH 0–15 Low/Shield 19, 20, 21, 22, 23, 24, 25, 26 Chassis Ground 9, 18 Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 40: Auxiliary Front Panel Output Connector

    Page 34 2.5.3 Auxiliary Front Panel Output Connector The 28108 card without Option 4 (Figure 13 and Table 11) provides a front-panel auxiliary output connector. Adapter modules are available from Precision Filters to provide additional buffered front-panel output connections per channel.

  • Page 41: Output Cable And Output Shielding

    28108 Setup and Installation Page 35 Table 11 28108 Front-Panel Auxiliary Output Connector Conn CH3-OUT-HI CH3-OUT-LO CH7-OUT-HI CH7-OUT-LO CH2-OUT-HI CH2-OUT-LO CH6-OUT-HI CH6-OUT-LO CH1-OUT-HI CH1-OUT-LO CH5-OUT-HI CH5-OUT-LO CH0-OUT-HI CH0-OUT-LO CH4-OUT-HI CH4-OUT-LO SYS OVLDLVL +5 V +5 V −18.2 VA −18.2 VA −18.2 VA...
  • Page 42 28108 Setup and Installation Page 36 This page intentionally blank. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 43: 28108 Operating Instructions

    Page 37 28108 Operating Instructions Introduction This section provides instructions for operating Precision 28108 cards in the 28000 system. Before operating the 28108 card, become familiar with the System 28000 Operation and Maintenance Instructions manual. Section 3.2 of the 28000 manual, System Functions, provides an overview of system functions, including the following: •...

  • Page 44: Column Mode

    Inactive controls are grayed out and inaccessible. Figure 15 shows the GUI in Column mode with one 28108 card installed. Figure 15 28108 GUI in Column Mode Note: Unless indicated otherwise, figures in this section show the GUI in Column mode.

  • Page 45: Changing The Display Mode

    Display Members button at the top of each control group. Figure 18 shows the a 28108 card with the channels displayed. Settings entered in the Group Control row or panel are automatically entered for all channels in the group.

  • Page 46: Setup And Operate Modes

    3.1.2 Setup and Operate Modes The operation of certain controls on the 28108 channel panel differs, depending on whether the system is in Operate mode or Setup mode. Use Setup mode to enable the settings you wish to use. In this mode, you can use the prefilter gain (PRG) and postfilter gain (POG) fields to set gain directly.

  • Page 47: Defining Operate Mode

    To enable the changing of a setting during Operate mode, clear the check box beside the setting you want to enable. Figure 21 Enabling or Exluding Controls for Operate Mode Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 48: 28108 Operation

    28108 Operating Instructions Page 42 28108 Operation This section describes the 28000 GUI control settings and warning indicators for the 28108 card. 3.2.1 Channel Identification The Channel Identification section displays each channel’s information in the four leftmost columns, as shown in Figure 22.

  • Page 49: Gain Wizard Modes

    Figure 23 shows the Gain Wizard Mode control. Figure 23 28108 Gain Wizard Modes Figure 24 shows the location of the controls on the 28108 channel displays referred to in this description of system scaling. Figure 24 28108 Gain Wizard Controls Precision Filters, Inc.
  • Page 50 Gain is automatically allocated between prefilter and postfilter gain, depending on the reserve setting. Wizard settings can be defeated by direct user input of PRG and POG or GAIN. This results in a recomputation of FSIN, which is updated on the GUI. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 51: Intelligent Gain Algorithm (Iga)

    100 μS recovery from x2, x4, x8, and x16 full-scale signals, make reserve settings (postfilter gain settings) of x2, x4, x8, and x16, respectively. See Figure 25. Figure 25 28108 Reserve Control Precision Filters, Inc. 28108 Installation and Programming Instructions...
  • Page 52 28108 Operating Instructions Page 46 EXC: The 28108 card features a fully programmable (per channel) constant voltage excitation supply. Excitation voltage is set from 0 V to 20 V in steps of 5 mV. The EXC setting may be used for gain calculation, depending on the selected Gain Wizard mode.

  • Page 53: Prg And Pog Control And Gain Display

    The OVLD display indicates prefilter overloads. An overload is detected if the signal exceeds 10 V at the input to the filter. The OVLD indicator is set to red during an overload condition. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 54: Excitation

    3.2.4 Excitation The 28108 features a fully programmable (per channel) constant voltage excitation supply that can source from 0 to 20 volts to the bridge. Figure 31 illustrates the controls used to set and monitor performance of the excitation supply.

  • Page 55: Input Coupling

    Thermal Shutdown indicator is lit. 3.2.5 Input Coupling The 28108 provides DC input coupling. The CPL control is set to DC coupling for all chan- nels. Modification M101 on the 28108 card provides fixed DC input coupling. Option 6 AC/DC Input Coupling Option 6 AC/DC Input Coupling allows the user to select the balanced differential input coupling, either AC coupled or DC coupled.

  • Page 56: Filter Type

    3.2.6 Filter Type Use the FTYPE control field on 28108-LP4FP cards to select either flat mode (LP4F) or pulse mode (LP4P) operation of the low-pass filter. See Figure 32. Flat mode provides pass-band characteristics nearly identical to a Butterworth filter while providing a much sharper roll-off.

  • Page 57: Test Mode

    3.2.9 Test Mode Use the Test Mode control field to select the test mode of the channel. Figure 33 illustrates the Test Mode control. Figure 33 28108 Test Mode Controls • RUN The channel's normal operation mode. • SHORT Establishes zero control to allow for the zeroing of the channel’s circuitry, independent of gain.

  • Page 58: Mute Control

    With high-gain signal conditioning this can be troublesome if large signal swings on input or output cabling crosscouple to other channels. The 28108 Mute control places the channel in the quietest operational state to minimize system noise in the event of a failed sensor.

  • Page 59: Automatic Bridge Balance And Zero Suppress

    Zero Suppress mode is available for applications where the 28108 excitation supply is not uti- lized but the amplifier zero is required. In this mode, a precision 10 V voltage source is used as the reference for the zero circuitry to provide the best zero stability.
  • Page 60 Use the Bal. (Sup.) Range control to select circuit optimization called for by the balance or suppress procedure. Bal. (Sup.) Range has two settings: Exc/2 (10V) and Exc/32 (0.625V). Figure 36 28108 BAL(SUP.) RANGE Control The EXC/2 (10V) setting is optimized for maximum balance range. Control firmware will first attempt zero correction using the lower-noise gain distribution, then retry using this range only if necessary.

  • Page 61: Balance Mode

    The auto balance procedure attempted to balance the bridge but failed, or the LED was green (i.e., bridge was successfully balanced) but then the input gain setting was changed. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 62: Suppress Mode

    Suppress has been initiated with the SUPPRESS button and the procedure was successful. The auto suppress procedure failed, or the LED was green (i.e., bridge was successfully balanced), but then the input 1/8 Gain setting was changed. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 63: Connectors Control

    Page 57 3.2.12 Connectors Control Press the Connectors button (Figure 39) to display I/O connector information illustrated in Figure 40. Figure 39 Connectors Button Figure 40 28108 I/O Connector Information Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 64: Go/No-Go Test

    Note: FAT protocols for the excitation test require the use of the 28108-TEST-ADAPTER. (See the following section.) The FAT routine for this test provides user prompts to install the adapters.

  • Page 65: 28108 Excitation Test

    The 28108-TEST-ADAPTER test adapter (PF pn A10953G2), shown in Figure 43, supports FAT testing of the excitation supply on the 28108 card. Two adapters per card are required to perform the excite FAT. These test adapters replace the normal input cables on the two input connectors of the 28108 card during excite FAT testing.
  • Page 66 See Figure 47. When you have done this, click OK. Figure 47 Excitation Test Window If the No 28316/28108 Adapter Popup Prompts field is unchecked, the Excitation Test window displays instructions to move the adapters to the next channel connectors as required. 28108 Installation and Programming Instructions Precision Filters, Inc.

  • Page 67: 28108 Lcs Commands

    This section is an extension of the 28000-LCS Programming Instructions manual and describes the LCS commands specific to the 28108 card functions. Refer to Section 2 of the 28000-LCS Programming Instructions manual for LCS commands that are common for the 28000 system and the Backplane Interface (BIF) card.

  • Page 68: Working With Lcs Commands

    "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. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 69: 28108 Lcs Commands

    Use the testmode command to set or return the test mode status for one or more channels. testmode:[run|short|testbus|testbusx1|testbus_att256|testbus_cm|cm|exc|zero_exc|?] [,<chan_list>]; On the 28108, test mode can be set independently for each channel. The following test modes are available: Normal operation of channel.

  • Page 70: Mute

    This provides input gain for best noise performance yet conforms to the limitations of your worst-case estimate of out-band or transient signals. Overload detectors alert you to overvoltage conditions. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 71: Gain Wizard Report

    Use the sensor command to set or read back sensor sensitivity for one or more channels. sensor:[<value>|?][,<chan_list>]; Sensor sensitivity is dependent on the sensor being used and reflects the sensitivi- ty or operating characteristic of the signal transducer. Units are expressed in units of mV/V/MU. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 72: Full-Scale Input Range

    Actual reserve is expressed in X units. Note: The actual reserve set by the Gain Wizard may be different from the reserve setting set with the resv command described in the previous subsection. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 73: Full-Scale Output

    Postfilter vernier gain settings range from 0.25 to x16 in binary steps with 0.05% resolution. 4.4.14 Test Postfilter Gain Use the test_pog command to select a special test POG setting. test_pog:[<value>|?][,<chan_list>]; Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 74: Suppressed Value

    Use the exc command to set or return excitation for one or more channels. exc:[<value>|?][,<chan_list>]; The 28108 features a programmable (per channel) constant voltage excitation supply that can source up to 20 volts to the bridge. Use exc to set the voltage excitation level for the sensor for one or more channels. The exc setting may be used for gain calculation, depending on the selected Gain Wizard mode.

  • Page 75: Filter Cutoff Frequency

    Use the byp command to set or return the bypass function setting for one or more channels. byp:[on|off|?][,<chan_list>]; The byp command bypasses the channel's filter section but leaves pre- and postfilter gain in the channel. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 76: Current Gain Offset Correct (Auto Offset)

    Note: The offset command is for diagnostic purposes only. It reads back or sets the chan- nel offset DAC value for the specified channels. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 77: Gain Adjust

    Once the balance function is initiated with the bal:run command, there is no further commu- nication via the Telnet interface until the routine is complete. The standard prompt (if enabled) is not displayed until the balance routine is complete. Precision Filters, Inc. 28108 Installation and Programming Instructions Rev. D...

  • Page 78: Balance Mode

    The format of gain calibration factors that are stored in 28108 cards is as follows: MM-DD-YY:<gain1 error>,<gain2 error>,...<gain41 error>; When sending the string in the gain_cal command, it may be advisable to put the string inside double quotes.
  • Page 79 28108 LCS Commands Page 73 The gain_cal operand string is limited to 255 characters on the 28108 card. The eepwen:on; command must be issue d before the gain_cal command is issued to enable writing to the EEPROM. The following error message is displayed if eepwen is disabled when the gain_cal command is...
  • Page 80 28108 LCS Commands Page 74 This page intentionally left blank. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 81: Maintenance

    28108 Maintenance Page 75 Maintenance Introduction This section contains maintenance information for the 28108 card. Refer to the System 28000 Operation and Maintenance Instructions manual for information about maintaining a 28000 system. Replaceable Parts There are no user-replaceable parts on 28108 cards.
  • Page 82 28108 Maintenance Page 76 This page intentionally left blank. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

  • Page 83: 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 84 Support and Service Page 78 This page intentionally left blank. 28108 Installation and Programming Instructions Precision Filters, Inc. Rev. D...

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