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PRECISION FILTERS 28164 Installation And Programming Instructions

Quad-channel 500 vcm galvanically isolated transducer conditioner with voltage and current excitation
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Installation and Programming Instructions
28164
Quad-Channel 500 Vcm Galvanically Isolated
Transducer Conditioner with Voltage and
Current Excitation
September 9, 2024
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

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Summary of Contents for PRECISION FILTERS 28164

  • Page 1 28164 Quad-Channel 500 Vcm Galvanically Isolated Transducer Conditioner with Voltage and Current Excitation September 9, 2024 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: Trademark Information

    Precision Filters’ PF28000 GUI WIN and PF28000 LCS GUI WIN software pro- grams are Copyright © 2024 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 This page intentionally left blank...

  • Page 4: Safety Notices

    Safety Notices Important: Please read and understand Section 2 of this manual, Setup and Installa- tion, before installing and operating 28164 conditioner cards. The information and procedures in that section are designed to prevent damage to property and harm to the user.

  • Page 5: Safety Information

    Site Preparation 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.

  • Page 6: Table Of Contents

    1.1.1 28164 Salient Features and Benefits ........
  • Page 7 2.6.2 28164 Input Connection Pin Assignments ........
  • Page 8 28164 Voltage Excitation Mode ........
  • Page 9 28164 Current Excitation Mode ........
  • Page 10 FAT Test ................149 3.5.1 28164-HC14 Excitation FAT Test and Shunt Cal Test ......150 28164-HC14 Excitation Test.
  • Page 11 FSOUT (Full-Scale Output Voltage)..........188 28164 Installation and Programming Instructions Precision Filters, Inc.
  • Page 12 28164 Current Excitation Mode ........
  • Page 13 Post-filter Gain (POG) ............235 28164 Installation and Programming Instructions Precision Filters, Inc.
  • Page 14 Service and Repair..............244 Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 15: 28164 General Information

    Introduction This manual provides instructions for the installation, configuration, setup, and operation of the 28164 card for the 28000 Signal Conditioning System. The content presented here extends the material covered in the Precision 28000 Signal Conditioning System Installation and Maintenance Instructions and the PF 28000-LCS-GUI-WIN Programming Instructions man- uals.

  • Page 16: 28164 Salient Features And Benefits

    • Precise digital calibration 28164 Description The 28164 quad-channel 500 V galvanically isolated common-mode transducer conditioner with voltage and current excitation, shown in Figure 1, offers four channels of conditioning to support a wide variety of transducers, including those that require constant current excitation.

  • Page 17: Balanced Constant Voltage Excitation

    Page 3 Figure 1 28164 Conditioner Card The 28164 is a member of the Precision 28000 family of signal conditioners. Up to sixteen 28164 cards can be accommodated in a 28000-M3 or M5 system, providing as many as 64 channels per mainframe. In addition, the 28164 may be mixed with other transducer conditioners in the 28000 family to meet the signal conditioning requirements of a particular application.

  • Page 18: Balanced Constant Current (Bcc)

    Suppression of the gage DC operating point is performed automatically using the 28164's zero suppress feature. Zero suppress allows the use of more gain to emphasize small gage fluctua- tions.

  • Page 19: Bank Isolated Aux1 Output (Option O)

    With the input DC coupled, low drift and ultra low noise is provided by the 28164 input stage. The input stage may be shorted to verify signal conditioner channel noise and DC offsets.

  • Page 20: Filter

    1.2.6 Filter The 28164 is configured with a 4-pole low-pass filter with cutoffs programmable from 1 Hz to 10 kHz and programmable flat/pulse mode. Flat mode provides pass-band characteristics nearly identical to a Butterworth filter while providing a much sharper roll-off.

  • Page 21: Strain Gage Loop Resistance

    Sudden increases in gage resistance are often a sign of gage failure. The 28164 card provides real-time monitoring of the total loop resistance in the gage and cable circuit. This loop resistance reading can be compared to pre- set limits and used to trigger an alert when unexpected resistance shifts (as well as gage shorts and gage open conditions) occur.

  • Page 22: Cable Roll-Off

    28164 Sensor Configuration The high degree of modularity of the 28164 allows the card to be easily configured to condi- tion a particular sensor type. Two factory-installed sensor configuration options are available to support a wide range of transducer conditioning applications.

  • Page 23: Bridge Configuration Module Specifications

    AC Coupling Frequency w/ IEPE Selected: 0.32 Hz ±5% Fault Monitor: Sensor open/short IEPE Bias Monitor: Bias voltage continuously monitored and compared to user defined limits HC10 Full-Bridge/RTD Configuration RTD Substitution Calibration: Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 24 Input Connector: 25-pin D-shell (2 ea.) Input Wires: ±EXCITATION (2) ±SENSE (2) ±SIGNAL (2) SHUNT CAL (3) ¼ Bridge RTN (1) single-arm bridge SHIELD (1) ISOLATED GROUND (1) SIGNAL GROUND (1) 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 25: 28164 Details And Specifications

    CMRR (DC to 1 kHz): 80 dB for 120 Ω gage 70 dB for 350 Ω gage 60 dB for 1 kΩ gage Initial Accuracy: 0.05% of setting ± 5 µA Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 26 Input Impedance: 2 MΩ nominal per side Initial Accuracy: 0.05% ±0 500 nA Drift: 1.5 nA + 0.0024% of setting per °C Noise: 3.5 pA per √Hz at 1 kHz 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 27: 28164 Filter Type Characteristics

    Phase Match: 0.1° typical, 1° max, DC to F −0.1 dB 0.15° typical, 1.5° max to F −0.5 dB Bypass: Bypasses filter but not amplifier stages Bypass Bandwidth: 25 kHz, typical Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 28: 28164 Input Characteristics

    The bridge is automatically balanced utilizing voltage insertion at the input amplifier when bridge balance mode is selected. The inserted voltage is derived from and thus tracks the excitation supply. A successive approximation A/D converter mechanization is used for 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...
  • Page 29 ±25 ppm /ºC of setting Drift (RTI): ±0.3 µV /ºC for 640 mV range; ±5 µV /ºC for 10.24 V range Auto Suppress Time: Less than 150 seconds per system of 64 channels. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 30: 28164 Amplifier Characteristics

    ±0.025% re Full scale, relative to the best straight line Frequency Response: DC to 10 kHz, 0 dB ±0.1 dB –3 dB typical @ 25 kHz High Frequency Rolloff: 18 dB/octave 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 31: 28164 Test Modes

    26-pin D is available per card slot. Auxiliary Outputs: Two female 15-pin D connectors that reside on the 28164 card, one for AUX1 output and a second for AUX2 output, are accessible via the rear of the 28000 chassis when the card is plugged into the chassis.

  • Page 32: Output Monitor

    DC coupled, single-ended output with selectable ground sense used for driving grounded single-ended loads. Output is referred to ground at the load. Output sense also reduces ground loop interference by breaking the connection between the load ground and the 28164 channel ground. Output Impedance: 10 Ω // 100 pF AUX1 Sense Output 100 Ω...

  • Page 33: 28164 General Characteristics

    Two 25-pin high-density D connectors are utilized for the 4 inputs (2 inputs per connector). Connectors have high-quality machined gold-plated pins/sockets. The 28164 primary output connectors are integral to the 28000 system chassis. Three wires per output are provided to accommodate twisted/shielded cables. Two additional auxiliary outputs (AUX1 and AUX2) are available via 15-pin D connectors that are integral to the card and accessible at the rear panel.

  • Page 34: Mainframe

    28164 General Information Page 20 Mainframe The 28164 is a member of the Precision 28000 family of signal conditioners, which consists of five unique mainframes (Figure 2): • For large channel-count configurations, the 28016-M3 and the 28016-M5 mainframes ac- commodate up to 16 transducer conditioning cards.

  • Page 35: Accessories

    Accessories 1.7.1 28164 Mating Connectors Precision Filters mating connectors accommodate up to 22-AWG wire and are supplied with high quality metal backshells and gold plated screw machined contacts for high reliability con- nections and long service life. CONN-IN-25D: High-Density 26-pin D-shell mating output connector with machined crimp pins and metal backshell with strain relief.

  • Page 36: 28164 Channel Block Diagram

    Output Gain DAC (Rear DC Voltage Panel) Substitution Unfiltered Auto Calibrate Gain & Offset Monitor Bus Figure 3 Channel block diagram for the 28164 signal quad-channel, dual-mode signal conditioning card 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 37: Site Preparation And Installation

    28164 Site Preparation and Installation Page 23 Site Preparation and Installation Important: Before installing and operating the 28164 conditioner cards covered in this manual, please read and understand the following: • This section, Site Preparation and Installation • The Precision 28000 Signal Conditioning System Installation and Maintenance Instruc-...

  • Page 38: Site Preparation

    28164 Site Preparation and Installation Page 24 Site Preparation This section describes the preparations that must be made on site prior to installing cards in a 28000 system. 2.1.1 Environmental Requirements CAUTION Do not install or operate the 28000 system and/or components in any location with heavy dust, unusually high or low temperatures, or high humidity (see Table 1).

  • Page 39: Unpacking

    If the equipment is damaged, file a claim with the carrier and forward a copy to Precision Filters. Retain the shipping container and packing material for the carrier to inspect or for reuse if the unit requires servicing and/or repair.

  • Page 40: Storage, Transport, And Shipment

    2.3.3 Shipping Requirements Always use the original packing materials to ship system components. A new shipping con- tainer may be purchased from Precision Filters. The environmental conditions described in Table 2 must be maintained. 28164 Installation and Programming Instructions Precision Filters, Inc.

  • Page 41: Card Configuration

    2.4.1 Output Ground Sense Output ground sense for the AUX1 output is standard on 28164 cards w/out Option O. Output ground sense is used for driving grounded single-ended loads. When selected, channel output is referred to ground at the load. Output ground sense reduces ground loop interference by providing a high-impedance connection between the ground at the load and the output stage ground.

  • Page 42: Setting The Excitation Mode

    2.4.2 Setting the Excitation Mode The dual-mode 28164 conditioner card operates in either constant voltage or constant current excitation mode. The mode is controlled from a manual switch on the front panel of the card (Figure 5). The selected mode applies to all channels on the card.

  • Page 43: Installing Cards

    28164 Site Preparation and Installation Page 29 Installing Cards CAUTION Switch off power to the 28000 system before installing or removing cards. Failure to do so will damage sensitive components. Transducer conditioner and backplane interface cards are not hot replaceable and cannot be removed or installed while power is applied to the system.

  • Page 44: Remove Cards

    28164 Site Preparation and Installation Page 30 Backplane Interface Card Transducer Card Extraction Handle Captive Screws Figure 6 Securing a card in the mainframe (28144 card shown) Remove Cards To remove a card, proceed as follows: Step 1 Loosen the top and bottom captive screws on the front of the card.

  • Page 45: Address Conventions

    [FRAME].[CARD].[CHAN]. For example, if the GUI is only connected to one mainframe with a 28164 card in the first card slot (= J0), the third channel on that card will display 0.00.02 as it's address. See Section 3.1.3, Channel Iden- tification Section, for more information on the channel address display in the GUI.

  • Page 46: Input Connections

    (P2) Figure 7 28164 25-pin front-panel input connectors 2.6.2 28164 Input Connection Pin Assignments The 28164 cards provides a 2- to 10-wire plus shield bridge input interface consisting of: • Six wires for the bridge: • +Signal • –Signal 28164 Installation and Programming Instructions Precision Filters, Inc.
  • Page 47 Table 3 and Table 4 list the pin assignments for the P2 (channels 0-1) and P3 (channels 2-3) front-panel input connectors on the 28164 card. Refer back to Figure 7 when reviewing the pin assignments to ensure correct pin identification.

  • Page 48: Input Wiring Configurations

    In the sections that follow, wiring diagrams are provided that summarize the circuit configura- tions that should be used with 28164 card. Section 2.7.1 covers proper isolation and grounding for the 28164 inputs. Section 2.7.2 and 2.7.3 cover the circuit configurations for 28164 cards operating with or without bridge completion modules.

  • Page 49: 28164 Isolated Input Configuration

    28000 system chassis, it may be most convenient to reference the Isolated Ground pin to the 28164 Signal Ground pin at the 28164 input connector (Figure 13).
  • Page 50 28164 Site Preparation and Installation Page 36 The single-ended input connection is grounded in Figure 9 and the amplifier input is refer - enced by connecting to the Isolated Ground pin. Here nothing is tied to the Shield pin of the amplifier.
  • Page 51 Figure 12 Balanced connection, ground source tied to sensor and input Isolated Ground pin If the inputs to the 28164 are referenced to the same ground as the 28000 system chassis, then the Isolated Ground should be connected to the Signal Ground (output common) via a jumper wire within the 28164 input connector for that channel as shown in Figure 13.

  • Page 52: Dual Mode Conditioning Without Bridge Completion Modules

    If the sensor is isolated from the test article (Figure 15), then the ground source reference con - nection is made directly to the Isolated Ground pin for that 28164 channel. In both instances, it is necessary to add a jumper wire on the 28164 input connector between Isolated Ground and –Signal as shown.
  • Page 53 28164 Site Preparation and Installation Page 39 anced and to minimize interfering noise sources. Figure 17 and Figure 18 show typical configurations for quarter-bridge and half-bridge cird - cuits, respectively. Card Interface +SENSE +EXCITATION +EXCITATION ISOLATED INPUT +SIGNAL – –SIGNAL –EXCITATION...

  • Page 54: 2-Wire And 4-Wire Constant Current

    Figure 18 Half-bridge with remote sense and user-supplied completion resistors 2-Wire and 4-Wire Constant Current Balanced constant current excitation can be implemented using the 28164 card without a bridge configuration module. Either a 2-wire or a 4-wire connection can be made to the sen- sor;...

  • Page 55: Dual Mode Conditioning With Bridge Configuration Modules

    The programmable HC10 and HC14 bridge configuration modules are factory installed when selected as an option for the 28164 card. The HC10 module supports full-bridge and RTD measurements. The HC14 supports measurements of strain in a quarter-, half-, or full-bridge configuration or a 2-wire/4-wire constant current configuration.
  • Page 56 28164 Site Preparation and Installation Page 42 Table 5 HC10 Bridge/RTD Configuration Module Switch (Truth) Table Configuration K3, K6 Shunt Cal Gage Shunt Cal Instrument Shunt R1 Shunt R2 Sensor RCAL Constant Current 2-Wire Constant Current 4-Wire DC Voltage Substitution...

  • Page 57: Example Voltage Mode Circuits

    28164 Site Preparation and Installation Page 43 Table 6 HC14 Bridge/Strain/IEPE Configuration Module Switch (Truth) Table Configuration K3, K6 Full Bridge 120 Ohm Completion 350 Ohm Completion 1000 Ohm Completion Shunt Cal Gage Shunt Cal Instrument Shunt R1 Shunt R2...
  • Page 58 28164 Site Preparation and Installation Page 44 Card Interface +SHUNT INST GAGE +SENSE +EXCITATION +EXCITATION ISOLATED INPUT +SIGNAL – INST GAGE SHUNT CAL –SIGNAL SHUNT –EXCITATION – EXCITATION –SENSE GAGE –SHUNT INST SHIELD Figure 22 4-arm, 4- or 6-wire full bridge configuration ¼...
  • Page 59 28164 Site Preparation and Installation Page 45 Card Interface +SHUNT +SENSE INST +EXCITATION GAGE +EXCITATION ISOLATED Active INPUT +SIGNAL – K10A 1/4 BRIDGE RTN SHUNT CAL –SIGNAL INST GAGE GAGE SHUNT – EXCITATION INST –SENSE –SHUNT SHIELD Figure 23 1-Arm, 2-wire (K5 closed, or "IN") and 3-wire (K5 open, or "OUT") ¼ bridge configuration ¼...

  • Page 60: Example Current Mode Circuits

    Example Current Mode Circuits Dual mode conditioner cards with programmable bridge configuration modules provide Precision Filters' proprietary balanced constant current (BCC) excitation circuitry. Balanced constant current excitation provides an accurate means of measuring dynamic strain with a single active strain gage using only a 2-wire connection. Electrostatic pickup is reduced in comparison to single-ended constant current excitation or a quarter-bridge configuration with remote completion resistors.
  • Page 61 28164 Site Preparation and Installation Page 47 sensing the voltage across the transducer with the high-impedance amplifier input signal leads. This setup should be used for RTD or silicon diode measurements. NOTE: The internal completion and shunt calibration circuitry cannot be used with the card in constant current excitation mode.

  • Page 62: Special 28164 Circuits

    Push-Push BCC (Option P) 28164 cards equipped with Push-Push BCC (Option P) may be switched from standard con- stant current excitation ("Push-Pull" BCC) to Push-Push BCC excitation. Push-Push mode provides an improved method for making measurements on any half-bridge, whether it con- sists of two active gages or one active gage and one compensating or dummy gage.
  • Page 63 28164 Site Preparation and Installation Page 49 The Push-Push technique can be implemented with a 2-wire, 3-wire, 4-wire, or 5-wire scheme for a half bridge as shown in Figure 27 and Figure 28 with the following configurations: 2-Wire Push-Push: K4 closed ("IN"), gage center point independently grounded 3-Wire Push-Push: K4 closed ("IN"), gage center point connected to shield...
  • Page 64 • Connect the upper gage connection to the +Signal pin on the 28164 input connector. • Connect the lower gage connection to the ¼ Bridge RTN pin on the 28164 input connector (this wire must match the TCR characteristics of the +Signal connection for zero stability).

  • Page 65: Output Connections

    28164 Site Preparation and Installation Page 51 Push-Push BCC DC I AC Test Current PUSH Card Interface for Interface Static/Dynamic Quarter Bridge PUSH AC/DC Coupling +Signal ISOLATED INPUT Open/Short/ GAGE Shield Leakage Detect – Compensating ¼ Bridge Resistor 120 Ω, 350 Ω, or 1 kΩ...

  • Page 66: 28004-M3/M5 4-Slot Mainframes

    Page 52 respectively. On most cards, the rear-panel connectors are used for channel inputs. On the 28164 card, the rear-panel connector slots are used for the AUX1 (J100-J101) and AUX2 (J200-J201) auxiliary output connectors. See Section 2.8.2 for more information.

  • Page 67: 28008-M3/M5 8-Slot Mainframes

    = 0-7. On most cards, the rear-panel connectors are used for channel inputs. On the 28164 card, the rear-panel connector slots are used for the AUX1 (J100-J107) and AUX2 (J200-J207) auxiliary output connectors. See Section 2.8.2 for more information.

  • Page 68: 28016-M3 16-Slot Mainframes

    = 0-15. On most cards, the rear-panel connectors are used for channel inputs. On the 28164 card, the rear-panel connector slots are used for the AUX1 (J100-J115) and AUX2 (J200-J215) auxiliary output connectors. See Section 2.8.2 for more information.

  • Page 69: 28016-M5 16-Slot Mainframes

    28000 system conditioner cards installed in slots J0-Jx, respectively, where x = 0-15. On most cards, the rear-panel connectors are used for channel inputs. On the 28164 card, the rear-panel connector slots are used for the AUX1 (J100-J1015) and AUX2 (J200-J215)auxiliary output connectors.
  • Page 70 28164 Site Preparation and Installation Page 56 J501 J215 J214 J213 J212 J211 J210 J209 J208 J207 J206 J205 J204 J203 J202 J201 J200 J502 J500 J115 J114 J113 J112 J111 J110 J109 J108 J107 J106 J105 J104 J103 J102...
  • Page 71 28164 Site Preparation and Installation Page 57 Table 7 50-Pin Primary Output Connectors for 28004-M3/ Table 8 50-Pin Primary Output Connectors for 28016-M3 M5, 28008-M3, and 28016-M3 Mainframes Mainframes Conn System Address Pin Assignments Conn System Address Pin Assignments –...
  • Page 72 28164 Site Preparation and Installation Page 58 Table 9 26-Pin Primary Output Connector Pin Assignments for 4-Channel Cards Channel Description −Signal +Signal Shield Ground −Signal +Signal Shield Ground −Signal +Signal Shield Ground −Signal +Signal Shield Ground Chassis Ground 9, 18 28164 Installation and Programming Instructions Precision Filters, Inc.

  • Page 73: Auxiliary Output Connections

    (AUX1 and AUX2). The AUX1 and AUX2 connectors extend through the rear-panel cutouts corresponding to mainframe connectors J20x and J10x, respectively. See Figure 35 for an example of a 28004 mainframe with four 28164 cards inserted. The corresponding pin assign- ments for the AUX1 and AUX2 connectors are listed in Table 10.

  • Page 74: 28164 Output Isolation

    A/D input. Since the output −Signal is connected directly to signal ground at the 28164, these should not also be connected to a second ground system at the recording device location. If a recording device has single-ended (grounded −Signal) inputs it is recommended to use the output ground sense...

  • Page 75: Aux1 Outputs Without Option O

    The ground sense circuitry prevents ground loop errors and effectively refer- ences the 28164 output to the ground potential of the remote ground. Examples of this config- uration are given in Figure 40 and Figure 41 for shielded/twisted pair connections, and Figure 42 for a coaxial connection.

  • Page 76: Aux1 Output With Bank Isolation (Option O)

    (AUX1 w/o Option O) Device Twisted/Shielded Pair +Signal –Signal –Shield S1 Open: GROUND SENSE S1 Closed: SINGLE ENDED Figure 40 Shielded/twisted pair single-ended connection, shield grounded at 28164 External 28164 Output Recording (AUX1 w/o Option O) Device Twisted/Shielded Pair +Signal –Signal...
  • Page 77 0 output. It is important to note that ONLY one shield termination is made on the 28164 side: if multiple shields are terminated at the 28164 there would be multiple ground loops and potential for excessive noise.
  • Page 78 If it is difficult or impossible to make cable shield connections in the connector backshell of the recording device, the cable shield ground can be provided on the 28164 side of the cable. This alternative Option O cabling scheme is shown in Figure 44.
  • Page 79 28164 Site Preparation and Installation Page 65 External 28164 Output Recording (AUX1 w/ Option O) Device Twisted/Shielded Pair +Signal –Signal Remote Connection –Shield to Remote Ground Ground (±90 V) Twisted/Shielded Pair +Signal –Signal –Shield Twisted/Shielded Pair +Signal –Signal –Shield Twisted/Shielded Pair +Signal –Signal...
  • Page 80 28164 Site Preparation and Installation Page 66 External 28164 Output Recording (AUX1 w/ Option O) Device Coaxial Cable +Signal –Signal Alternate Connection Remote to Remote Shield Ground Ground (±90 V) Coaxial Cable +Signal –Signal Shield Coaxial Cable +Signal –Signal Shield...
  • Page 81 28164 Site Preparation and Installation Page 67 External 28164 Output Recording (AUX1 w/ Option O) Device Coaxial Cable +Signal –Signal Remote Shield Ground (±90 V) Coaxial Cable +Signal –Signal Shield Coaxial Cable +Signal –Signal Shield Coaxial Cable +Signal –Signal Shield...

  • Page 82: 28164 Operating Instructions

    The 28164 card operates in either Voltage Excitation mode or Current Excitation mode. The operating mode is set with the EXC MODE switch on the 28164 front panel. Refer to Section 2.4.2, Setting the Excitation Mode, for instructions on changing the operating mode. In either mode, all four of the card’s channels operate in the selected mode.

  • Page 83: Channel Identification Section

    To view the full model number, click the Card button in the Group Control section. This displays the card number in the Message window at the bottom of the GUI. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 84: 28164 Voltage Excitation Mode

    Page 70 28164 Voltage Excitation Mode This section describes channel controls and settings that are specific to 28164 cards set to volt- age excitation mode. If operating the 28164 card in current excitation mode, see Section 3.3, 28164 Current Excitation Mode, for information related to operating the card in that mode.

  • Page 85: Input Shield Connection Options

    NOTE: With the Shield programmed for ISO GND, the shield must be referenced at one and only one point or excessive noise coupling may occur on the input. Figure 50 Selecting an Input Shield option Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 86: Bridge Configuration Module Setup Hc14

    Note: For cards without a bridge configuration module installed, only the 4-arm bridge configuration option is available. See Section 2.7.2 for guidance on bridge conditioning without a bridge completion module. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 87: Bridge Resistance Selection Hc14

    • GAGE: Select GAGE if the sense lines are connected to the gage. • INST: Select INST if the sense lines are not connected to the gage. Figure 54 Excitation Sense options Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 88: Transducer Health Measurement Setup

    Use the Loop Resistance Maximum (Open) field to set the maximum resistance value, in Ω, that triggers a Transducer Open (OPN) condition. Measured Excitation Tolerance Field The Measured Excitation Tolerance field displays the factory set tolerance of 1% and is shown for reference only. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 89: Hc10/Hc14 Shunt Calibration Setup

    Setup panel's Shunt Calibration section. Note: The Shunt Calibration section is only visible when the GUI is operated with a 28164 card that includes a bridge configuration module. This section is used to set the DC shunt calibration value, choose the bridge arm to be shunted, and select how shunt calibration leads are connected to the transducer (at the instrument or at the gage).

  • Page 90: Hc10 Sensor Resistive Calibration Polarity Setup (Sensor_R_Cal)

    If Shunt Application is set to R2, shunt values are entered as positive numbers. HC10 Sensor Resistive Calibration Polarity Setup (Sensor_R_Cal) Some sensors contain internal shunt calibration resistors and require an external contact 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 91: Hc14 Iepe Input Mode Setup

    Note: The Sensor_R_Cal section is only visible when the GUI is operated with a 28164 card that includes an HC10 bridge configuration module. In the Setup panel’s Sensor_R_Cal section, select the desired GAGE_SHUNT connection: +EXC or −EXC.

  • Page 92: Auto Bridge Balance (V)

    3.2.2 Auto Bridge Balance (V) When using the 28164’s built-in excitation supply to power a bridge-type transducer, the Auto Bridge Balance option is used to balance the bridge automatically for zero DC output when the sensor has no major input (i.e., is measuring zero load, strain, pressure, etc.). For applications where the excitation supply is not used, the Auto Suppress option can be used to zero the DC on the signal at the amplifier input.
  • Page 93 Figure 64 Balance Range options • EXC/32 Auto Balance Range The EXC/32 setting will effectively balance nearly all bridge-type sensors. This is the recommended setting for the 28164 amplifier. Up to EXC/32 volts of bridge imbalance may be accommodated. EXC/32 Setting Ranges and Resolutions: ±0.0001 mV/V to ±32 mV/V in ±0.976 μV/V steps...

  • Page 94: Auto Balance Function

    Auto Balance range by manually entering a voltage value. • Reset Button The Reset button resets the balance voltage value to 0.00 V. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 95: Auto Suppress Mode (V)

    3.2.3 Auto Suppress Mode (V) Auto Suppress mode is used to suppress DC at the amplifier input when the 28164’s built-in excitation supply is not being utilized. Auto Suppress mode suppresses the gage DC operating voltage offsets by injecting a pro- grammable DC offset derived from a precision 10 V reference at the channel input stage.

  • Page 96: Auto Suppress Function

    Auto Suppress was initiated with the Auto Suppress (SUP) button and the procedure was successful. The Auto Suppress procedure failed. • Suppress Numeric Field The Auto Suppress field returns the value of the suppress voltage (V) after the Auto Sup- 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 97: Test Mode (V)

    TESTBUS, and TMODE_X1. These input source options are described below. • RUN Run is the normal operating mode. The input source is the 28164 card's input connectors. • SHORT Short disconnects the input connectors and shorts the channel input to ground. Use this test mode to measure the filter/amplifier noise and DC offset.

  • Page 98: Input Protection (V)

    The 28164 card has a built-in safety switch that is used to isolate the earth-ground refer- 28164 Installation and Programming Instructions Precision Filters, Inc.

  • Page 99: Fault And Warning Indicators (V)

    Input Protection OFF. 3.2.6 Fault and Warning Indicators (V) The 28164 card has seven fault and overload LED indicators, as shown in Figure 74: • OVL: Pre-filter overload indicator • OPN: Transducer open Precision Filters, Inc.
  • Page 100 The Fault Overload Log options are to append the fault overload file when a fault occurs or not to append the file. To display the Control Options panel (Figure 75), select Configure → Options... from the GUI Main Menu. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...
  • Page 101 IEPE bias voltage is below the user set limit, See Section 3.2.1, HC14 IEPE Input Mode Setup (V). • TSD (Excitation Thermal Shut down) The excitation supply regulator’s temperature is continuously monitored. If the temperature Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 102: Fault Check Interval (V)

    Fault Enable button to turn fault checking on or off. When the Fault Enable button is red and appears unpressed, the function is disabled and channel fault LEDs will not illuminate on the GUI display. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 103: Muting Faulty Sensors (V)

    3.2.9 Muting Faulty Sensors (V) The Mute button (Figure 76) enables or disables the 28164's Mute mode. When the Mute button is ON, the channel is placed in a quiescent state, minimizing the possibility of coupling noise on properly functioning channels from a faulty or failed sensor. Mute mode is also use- ful for terminating unused channels in a safe and quiet state.

  • Page 104: Gain Wizard Mode (V)

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. In Voltage Excitation mode, the 28164 has three Gain Wizard modes: • FSOUT/FSIN The FSOUT/FSIN mode is used when the channel signal requires amplification based on the maximum value of the full-scale input voltage and the required full-scale output volt- age.

  • Page 105: Fsout/Fsin (V)

    FSOUT is the full-scale output voltage of the channel. Full-scale output is determined by the specified maximum input level of the device receiving the output signal, such as a data acquisition system. The FSOUT value range is 0.625 V to 10 V. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 106: Examples Of Setting Fsout/Fsin

    • In the SEN field, a value of 2,000 mV/V is entered. • The maximum input level is unchanged: 10 V is entered in the FSOUT field. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 107: Fsout/(Fsin*Sensor) (V)

    FSOUT is the full-scale output voltage of the channel. Full-scale output is determined by the specified maximum input level of the device receiving the output signal, such as a data acquisition system. The FSOUT value range is 0.625 V to 10 V. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 108: Examples Of Setting Fsout/(Fsin*Sensor)

    • The IGA calculates the value of GAIN as x100 and the value of the channel sensitivity (SEN) as 100 mV/g. With these settings, a 100 mV change in the output signal represents 1 g of change in the input signal. See Figure 83. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 109: Fsout/(Fsin*Sensor*Exc) (V)

    Channel output sensitivity (SEN): Entering this value defines the overall channel output sensitivity delivered to the recording device in mV/measurement units (MU). The IGA auto- matically calculates FSIN and GAIN values. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 110 IGA across both sides of the filter, and the results of the distribution appear in the pre-filter gain (PRG) and post-filter gain (POG) fields. The distribution of PRG and POG 28164 Installation and Programming Instructions Precision Filters, Inc.

  • Page 111: Examples Of Setting Fsout/(Fsin*Sensor*Exc)

    SENSOR ≈ Gf/2 ≈ 1 µV/V/MU = 1 µV/V/µε If four gages with the same properties are in a full-bridge configuration, the relation is: SENSOR = Gf = 2 µV/V/MU = 2 µV/V/µε Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 112 FSIN is increased to 5000 MU. With these settings, each 2 mV of change in the output signal represents 1 με of change in the input signal. See Figure 87. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 113: Pre-Filter Gain (Prg) And Post-Filter Gain (Pog) (V)

    Gain Wizard mode. See the examples at the end of this section to understand how the PRG and POG interact with the IGA and Gain Reserve settings. 28164 cards have an input overload detection threshold of 10 Vpk. The pre-filter gain range is determined by the Auto-Balance/Suppress mode: •...

  • Page 114: Gain Reserve (V)

    ±10 Vpk the signal will clip, becoming distorted and invalid. When the signal is over the limit of the pre-filter stage, the GUI alerts you to an overload condition. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...
  • Page 115 REQ value. The calculated (ACT) reserve ratio is based on the following formula: (±10 Vpk pre-filter threshold / FSOUT) x post-filter gain (POG) Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 116: Examples Of Setting Gain Reserve And Prg/Pog

    Note that in this case, even with REQ set to x1, there is still out-of-band protection (ACT > 1) because the pre-filter gain limit (x512) is less than the total gain (x2000) required for the in- band signal. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 117: Excitation And Loop Resistance Monitors (V)

    LP RES warning LED indicator. Note: See Section 3.2.6, Fault and Warning Indicators (V), for information about programming the user-defined tolerances and for descriptions of the fault and warning indicators. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 118: Low-Pass Filter Options (V)

    Figure 94 Low-Pass Filter Options panel Low-Pass Filter Type Options The 28164's LP4FP low-pass filter has two filter type options: • Flat mode: Flat mode has passband flatness equivalent to a Butterworth filter yet with a sharper roll-off. This mode is a good choice as an anti-aliasing filter and for applications that require spectral analysis.

  • Page 119: Low-Pass Filter Bypass

    Each of the three outputs − Rear Out (Primary), AUX1 OUT (Auxiliary 1), and AUX2 OUT (Auxiliary 2) − can be set independently. Choose FIL for filtered output or WB for wideband output. See Figure 97. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 120: Wideband Gain Ratio (V)

    When the AC/DC input coupling is set to AC, Auto Balance/Suppress functions are inoperative and the BALANCE/SUPPRESS fields are disabled. To select an AC/DC input coupling option, click in the CPL field and select either AC or DC. See Figure 99. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 121: Auto Adjust Options (V)

    Page 107 Figure 99 Selecting AC or DC Input Coupling 3.2.22 Auto Adjust Options (V) The 28164 card's Auto Adjust options provide pre-programmed auto-adjust routines. The available routines in voltage excitation mode are as follows: • All Gains Auto Offset Correct •...
  • Page 122 DCCAL Auto Adjust uses an attached DVM to exercise the DCCAL voltages throughout the ±100 mV and ± 10 V operating ranges to determine correction factors for optimal per- formance. Results are saved in EEPROM on the 28164 card. Note: DCCAL Auto Adjust is disabled when the Input Protect switch is ON (see Section 3.2.5).
  • Page 123 28164 GUI Programming Instructions Page 109 Figure 101 28164 Auto Adjust panel Step 2 Click the button for the desired auto-adjust routine. The LED indicator left of the selected auto-adjust routine button indicates the routine's status. Gray indicates the routine is running.

  • Page 124: 28164 Current Excitation Mode

    Use the Setup panel to set up the transducer and configure the card for the transducer’s Input Shield connection. The Setup panel for a 28164 card in current mode without a bridge config- uration option (HC10 or HC14) is shown in Figure 102.

  • Page 125: Input Shield Connection Options

    NOTE: With the Shield programmed for ISO GND, the shield must be referenced at one and only one point or excessive noise coupling may occur on the input. Figure 104 Selecting an Input Shield connection Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 126: Transducer Setup

    Refer to Section 2.7.3 for details on these particular constant current measurement circuits and their configuration. Note: The Transducer Setup section is only visible when the GUI is operated with a 28164 card that includes an HC10 or HC14 bridge configuration module. Figure 105 Selecting the transducer wiring configuration...
  • Page 127 Use the Leakage Resistance Minimum field to set the minimum leakage resistance value, in Ω, that triggers a Loop Resistance Short (SHT) condition. Measured Excitation Tolerance Field The Measured Excitation Tolerance field displays the factory set tolerance of 1.5% and is Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 128: Hc10 Rtd Cal Resistance

    Ω, with accuracy of ±.01% (5 ppm/°C). Note: The RTD CAL resistance section is only visible in the Setup panel when the GUI is operated with a 28164 card that includes an HC10 bridge configuration module. Figure 108 RTD_Cal Resistance setup HC14 IEPE Input Mode Setup The HC14 module set to IEPE supply provides nominal 26 V, 8 mA (±...

  • Page 129: Auto Suppress Mode (I)

    3.3.2 Auto Suppress Mode (I) Auto Suppress mode is used to suppress DC at the amplifier input when the 28164’s built-in excitation supply is not being utilized. Auto Suppress mode suppresses the gage DC operating voltage offsets by injecting a pro- grammable DC offset derived from a precision 10 V reference at the channel input stage.

  • Page 130: Auto Suppress Function

    • 0 625 V Auto Suppress Range The 0.625 V setting accommodates DC suppression of most externally excited bridge cir- cuits and allows for the full programmable gain range of the 28164 amplifier. Up to 0.625 volts of DC input suppression is accommodated.

  • Page 131: Test Mode (I)

    The Test Mode controls, shown in Figure 113, are used to manage the input source of a chane - nel. Test mode provides eight input source options: RUN, IZERO, SHORT, LOOPRES, CHOP- PER_CAL, DCCAL, TESTBUS, and TMODE_X1. These input source options are described below. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 132 28164 GUI Programming Instructions Page 118 • RUN Run is the normal operating mode. The input source is the 28164 card's input connectors. • IZERO In IZERO test mode, the excitation current is set to zero (open circuit), and all other channel controls and functions are disabled.

  • Page 133: Input Protection (I)

    The 28164 card has a built-in safety switch that is used to isolate the earth-ground refer- enced ± 10 V Test Bus signal from the potentially high voltage of the input stage. It is crucial that the Test Bus mode voltage substitution capability is not invoked in the presence of high common mode voltage on the input wiring or damage may occur to the amplifier.

  • Page 134: Fault And Warning Indicators (I)

    Input Protection OFF. 3.3.5 Fault and Warning Indicators (I) The 28164 card has seven fault and overload LED indicators, as shown in Figure 118: • OVL: Pre-filter overload indicator • OPN: Transducer open •...
  • Page 135 When the HC14 IEPE Input mode is set to on, the OPN indicator is remapped to indicate that IEPE bias voltage is above the user set limit. See Section 3.3.1, HC14 IEPE Input Mode Setup (I). Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 136: Fault Check Interval (I)

    The Fault Check Interval value is defined on the Control Options panel (Figure 119). Enter the desired value in the Fault Check Interval field. 3.3.7 Fault Check Enable/Disable (I) 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 137: Muting Faulty Sensors (I)

    3.3.8 Muting Faulty Sensors (I) The Mute button (Figure 120) enables or disables the 28164's Mute mode. When the Mute button is ON, the channel is placed in a quiescent state, minimizing the possibility of coupling noise on properly functioning channels from a faulty or failed sensor. Mute mode is also use- ful for terminating unused channels in a safe and quiet state.

  • Page 138: Gain Wizard Mode (I)

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. In Current Excitation mode, the 28164 card has four Gain Wizard modes: • FSOUT/FSIN The FSOUT/FSIN mode is used when the channel signal requires amplification based on the maximum value of the full-scale input voltage and the required full-scale output volt- age.

  • Page 139: Fsout/Fsin (I)

    FSOUT is the full-scale output voltage of the channel. The full-scale output is determined by the specified maximum input level of the device receiving the output signal, such as a data Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 140: Examples Of Setting Fsout/Fsin

    1 V of change in the input signal. See Figure 124. Figure 124 Example 1: FSOUT/FSIN Example 2: In the same setup as Example 1, a read-out sensitivity of 2,000 mV/V is de- sired on the channel output. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 141: Fsout/(Fsin*Sensor) (I)

    FSOUT is the full-scale output voltage of the channel. Full-scale output is determined by the specified maximum input level of the device receiving the output signal, such as a data acquisition system. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 142: Examples Of Setting Fsout/(Fsin*Sensor)

    • The IGA calculates the value of GAIN as x100 and the value of the channel sensitivity (SEN) as 100 mV/°C. With these settings, a 100 mV change in the output signal represents 1°C of change in the input signal. See Figure 127. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 143: Fsout/(Fsin*Sensor*Exc) (I)

    SEN and GAIN values. Channel output sensitivity (SEN): Entering this value defines the overall channel output sen- sitivity delivered to the recording device in mV/MU. The IGA automatically calculates FSIN and GAIN values. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 144 IGA across both sides of the filter, and the results of the distribution appear in the pre-filter gain (PRG) and post-filter gain (POG) fields. The distribution of PRG and POG gain is configured using the Reserve field. See Section 3.3.16, Gain Reserve (I). 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 145: Examples Of Setting Fsout/(Fsin*Sensor*Exc)

    .7 for SENSOR units of µV/mA/με, or 7E-4 for units of mV/mA/με. Note that changing the units will update any previously en- tered SENSOR value. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 146 FSIN is decreased to 500 MU (= με). With these settings, a 20 mV change in the output signal represents 1 με of measured strain. See Figure 131. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 147: Fsout/(Fsin*Gf*R*Exc/Mod) (I)

    The SENSOR value is automatically calculated by the IGA depending on the values entered in the other Gain Wizard fields. Sensor sensitivity is expressed as mV/MU. MU represents the sensor's physical unit of measurement. In this mode, SENSOR is SENSOR = Gf*R*EXC/Mod Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 148 (PRG) and post-filter gain (POG) fields. The distribution of PRG and POG gain is configured using the Reserve field. See Section 3.3.16, Gain Reserve (I). Note: Direct entry of the GAIN value changes the values of FSIN and SEN. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 149: Examples Of Setting Fsout/(Fsin*Gf*R*Exc/Mod)

    • The total channel gain (GAIN) is calculated as: GAIN = FSOUT/(FSIN*Gf*R*EXC/Mod) = SEN/SENSOR = x214.27 With these settings, a 100 mV change in the output signal represents 1 increment of measured stress (in MU) (Figure 133). Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...
  • Page 150 GAIN as x1428.48, and the channel output sensitivity (SEN) as 10 mV/MU. With these settings, a 10 mV change in the output signal represents 1 με of measured strain. See Figure 135 (compare with Figure 130). 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 151: Pre-Filter Gain (Prg) And Post-Filter Gain (Pog) (I)

    Gain Wizard mode. See the examples at the end of this section to understand how the PRG and POG interact with the IGA and Gain Reserve settings. 28164 cards have an input overload detection threshold of 10 Vpk. The pre-filter gain range is determined by the Auto-Suppress mode: •...

  • Page 152: Gain Reserve (I)

    ±10 Vpk the signal will clip, becoming distorted and invalid. When the signal is over the limit of the pre-filter stage, the GUI alerts you to an overload condition. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...
  • Page 153 REQ value. The calculated (ACT) reserve ratio is based on the following formula: (±10 Vpk pre-filter threshold / FSOUT) x post-filter gain (POG) Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 154: Examples Of Setting Gain Reserve And Prg/Pog

    Example 2: In the same setup as Example 1, the Gain Reserve REQ is increased to x8. The PRG is now calculated as x128 and the POG is calculated as x11.1608 (=1428.58/128). The new 28164 Installation and Programming Instructions Precision Filters, Inc.

  • Page 155: Excitation, Loop Resistance, And Leak Resistance Monitors (I)

    Section 3.3.5, Fault and Warning Indicators (I). • LEAK RES Report Field Leak resistance is monitored and reported in the LEAK RES field (in kΩ). Measured leak Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 156: Excitation And Loop Resistance Monitors, Option P, Push-Push (I)

    3.3.18 Excitation and Loop Resistance Monitors, Option P, Push-Push (I) For 28164 cards equipped with Option P, a second panel is provided for monitoring the ex- citation and loop resistance on channels set to Push-Push. The monitors described in Section 3.3.17 are relabeled PUSH/PULL and report data for channels that are not in Push-Push mode.

  • Page 157: Low-Pass Filter Options (I)

    Figure 144 Low-Pass Filter Options panel Low-Pass Filter Type Options The 28164 card's LP4FP low-pass filter has two filter type options: • Flat mode (LP4F): Flat mode has passband flatness equivalent to a Butterworth filter yet with a sharper roll-off. This mode is a good choice as an anti-aliasing filter and for applica- tions that require spectral analysis.

  • Page 158: Low-Pass Filter Bypass

    Each of the three outputs − Rear Out (Primary), AUX1 OUT (Auxiliary 1), and AUX2 OUT (Auxiliary 2) − can be set independently. Choose FIL for filtered output or WB for wideband output. See Figure 147. 28164 Installation and Programming Instructions Precision Filters, Inc. Rev. A...

  • Page 159: Wideband Gain Ratio (I)

    When the AC/DC input coupling is set to AC, Auto Balance/Suppress functions are inoperative and the BALANCE/SUPPRESS fields are disabled. To select an AC/DC input coupling option, click in the CPL field and select either AC or DC. See Figure 149. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 160: Auto-Adjust Options (I)

    Page 146 Figure 149 Selecting AC or DC Input Coupling 3.3.23 Auto-Adjust Options (I) The 28164 card's Auto Adjust options provide pre-programmed auto-adjust routines. The available routines in current excitation mode are as follows: • All Gains Auto Offset Correct •...
  • Page 161 DCCAL Auto Adjust uses an attached DVM to exercise the DCCAL voltages throughout the ±100 mV and ± 10 V operating ranges to determine correction factors for optimal per- formance. Results are saved in EEPROM on the 28164 card. Note: DCCAL Auto Adjust is disabled when the Input Protect switch is ON (see Section 3.3.4).

  • Page 162: Go/No-Go Test

    28164 GUI Programming Instructions Page 148 Figure 151 28164 Auto Adjust Panel Step 2 Click the button for the desired auto-adjust routine. The LED indicator left of the selected auto-adjust routine button indicates the routine's status. Gray indicates the routine is running.

  • Page 163: Fat Test

    Note: Cards with the HC14 configuration module installed, or no bridge configuration option, use the 28164-TEST-ADAPTER and Keysight 34465 Digital Multimeter or similar DMM to run the Excitation and Shunt Cal FAT test. Cards with the HC10 configuration module installed use the 28164-HC10-TEST- ADAPTER and a Keysight 3458A Digital Multimeter to run the Excitation and Shunt Cal FAT test.

  • Page 164: 28164-Hc14 Excitation Fat Test And Shunt Cal Test

    The Excitation FAT test and Shunt Cal test requires the following plug-in adapters: • Two 28164-TEST-ADAPTERs Two 28164-TEST-ADAPTERs are used for both the Excitation test and the Shunt Cal test. Two adapters are recommended for each 28164 card selected for testing.

  • Page 165: 28164-Hc14 Excitation Test

    Page 151 28164-HC14 Excitation Test The Excitation Test protocol requires that a pair of 28164-TEST-ADAPTERs be installed on the card being tested. A minimum of two adapters is required. The test software will prompt the user to install the adapters and to then move them from card to card as the test proceeds, depending on the channels selected for testing.

  • Page 166: 28164-Hc14 Shunt Cal Test

    3.5.2 28164-HC14 Shunt Cal Test The Shunt Cal Test protocol requires that a pair of 28164-TEST-ADAPTERs be installed on the card being tested. At least two adapters are required. The test software prompts the user to install the adapters and to move the them from card to card as the test proceeds, depending on the channels selected for testing.
  • Page 167 Page 153 Use the following steps to install the 28164-TEST-ADAPTERs: Step 1 Remove all input cables from the 28164 cards, as prompted. See Figure 158. Figure 158 Example of prompt to remove cables and install adapters CAUTION Running the FAT test without removing the input cables can result in damage to some types of sensors.

  • Page 168: Cb-28164-Hc14-Test Cable

    Connect the channel 0 set of banana connectors to the DMM following the label on each connector. Step 3 On the 28164-TEST-ADAPTER, set the switch S1 to UP and switch S2 to DOWN. See the example in Figure 156 for a 28144 card. Step 4 Connect the 25-pin connector on the cable to the adapter.

  • Page 169: 28164-Hc10 Excitation Fat Test And Shunt Cal Test

    The 28164-TEST-ADAPTER-3458A installs on the 3458A DMM and measures the cali- brated resistors in the 28164-HC10-TEST-ADAPTER. The Excitation FAT test is a four part test: the 28164-HC10-TEST-ADAPTER is first calibrat- ed, followed by calibration of the 8V test mode and execution of the excitation test and Shunt Cal test.
  • Page 170 Calibrating the 28164-HC10-TEST-ADAPTER NOTE: The following GUI examples (Figure 161 to Figure 172) are documented for PFI's 28124 and 28144 conditioner cards. As documented, the procedure also applies to the 28164 card. Step 1 The GUI displays the 28164 Adapter Calibration panel shown in Figure 161. The...
  • Page 171 28124-HC10-TEST-ADAPTER installed Step 3 The GUI displays the 28164 Adapter Calibration panel, as shown in Figure 164. Depending on the selection in Step 2, set the 3458A terminal switch to front or rear and remove all cables from the selected input terminals. Plug the 28164-TEST- ADAPTER-3458A into the selected terminals on the 3458A DMM with the adapter’s slide switch on top.
  • Page 172 Figure 165 Adapter Calibration panel Step 5 The GUI displays the 28164 Adapter Calibration panel as shown in Figure 166. The measured value is displayed for channel 0. The resistance should measure 350 Ohms ±0.03% (0.02% tolerance plus 0.01% DMM uncertainty), i.e. a reading between 349.895 Ω...

  • Page 173: 28164-Hc10 Excitation Test

    Page 159 Figure 167 Adapter Calibration panel Step 7 Repeat Steps 4 through 6 until all of the 28164 cards selected in the PF 28000 FAT Test Selection panel have two calibrated 28164-TEST-ADAPTERS installed. Step 8 The GUI displays the Adapter Calibration panel as shown in Figure 168. Follow the...

  • Page 174: 28164-Hc10 Shunt Cal Test

    28164 cards may result in damage to some types of sensors. Step 2 Plug one test adapter into each of the two 28164 input connectors. Each card selected in the FAT Test Selection panel requires two test adapters installed before the test is run.
  • Page 175 Click OK when complete. Figure 172 Excitation Test Panel If other FAT tests were selected, the selected tests continue to run. Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

  • Page 176: 28164 Lcs Commands

    This section, 28164 LCS Commands, describes the LCS commands specific to the 28164 card and is an extension of the 28000-LCS-GUI-WIN Programming Instructions manual and Section 3, 28164 Operating Instructions, of this manual. Refer to Section 4 of the 28000-LCS- GUI-WIN Programming Instructions manual for LCS commands that are common to the 28000 system and backplane interface card (BIF).

  • Page 177: Lcs Command Format

    “ON” or “OFF” on any channel, or to set the switch to “ON” or “OFF” on any channel, the general syntax will appear in the manual as: chstate:[on|off|?],[<chan_list>]; As a specific example, use chstate to set channels 1 and 2 to “OFF”: PF28K: chstate:off,1,2; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 178: 28164 Lcs Command Set

    The 28164 card operates in either Voltage Excitation mode or Current Excitation mode. The operating mode is set with the MODE switch on the 28164's front panel. Refer to Section 2.4.2 of this manual, Setting the Excitation Mode, for instructions on how to change the operating mode.

  • Page 179: Display Card Configuration

    The config command is used to read back the operating mode of 28164 cards installed in the system. The response for a card configured for Voltage mode is returned with the model number indicated as 28164V. For example, with a single 28164 card in Slot J0 in voltage mode, entering PF28K: config;...

  • Page 180: Hc14 Bridge Configuration Selection (V)

    To enter a bridge resistance value for ½ and full bridges, use the bridge_r command: bridge_r:[<value>|?],[<chan_list>]; In the example below, the channel 0 bridge configuration is set to 1-arm 2-wire, and the bridge resistance is set to 120 ohms. Entering PF28K: bridge_cfg:1ARM_2W,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 181: Excitation Sense Selection (V)

    • LP RES (Loop resistance outside user-defined tolerance) Loop Resistance Tolerances Loop resistance tolerances are set with two values: the Expected Loop Resistance value and the Loop Resistance Tolerance value. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 182: Loop Resistance Minimum (Short)

    Loop Resistance Minimum (Short) The rloop_min command sets the minimum loop resistance value, in Ω, that triggers a trans- ducer short condition. rloop_min:[<value>|?],[<chan_list>]; For example, entering PF28K: rloop_min:100,0,1,2,3; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 183: Loop Resistance Maximum (Open)

    • Shunt Value DC Shunt Application The shunt_application command allows the selection of single shunt calibration for either the R1 or R2 bridge arm. shunt_application:[R1|R2|?],[<chan_list>]; For example, entering PF28K: shunt_application:R2,0; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 184: Shunt Connection

    The HC10 provides a three-step bipolar shunt calibration using a precision resistor. Select single shunt of either the R1 or R2 bridge arms. • Shunt Resistance 29.940 kΩ 87.325 kΩ 249.5 kΩ 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 185: Hc14 Shunt Values

    IEPE transducers. The IEPE Input mode continuously monitors the bias voltage levels and reports if the levels are out of user-defined limits. The iepe_supply command sets the 28164 card with HC14 configuration module to IEPE Input mode: iepe_supply:[OFF|ON|?],[<chan_list>];...

  • Page 186: Auto Balance/Suppress (V)

    With Auto Bridge Balance, a wide range of unbalanced conditions can be accommodated. Select Auto Bridge Balance mode when the 28164’s built-in excitation supply is used to power a bridge-type transducer. This will automatically balance the bridge for zero DC output when the sensor has no major input (i.e.

  • Page 187: Setting Up Auto Balance/Suppress Mode

    • EXC/32 (0 625 V) Auto Balance Range The EXC/32 setting will effectively balance nearly all bridge-type sensors. This is the recommended setting for the 28164 amplifier. Up to EXC/32 volts of bridge imbalance may be accommodated. EXC/32 Setting Ranges and Resolutions: ±0.0001 mV/V to ±32 mV/V in ±0.976 μV/V steps...

  • Page 188: • 0 625 V Auto Suppress Range

    • 0 625 V Auto Suppress Range The 0.625 V setting accommodates DC suppression of most externally excited bridge cir- cuits and allows for the full programmable gain range of the 28164 amplifier. Up to 0.625 volts of DC input suppression is accommodated.

  • Page 189: Run/Reset Auto Balance/Suppress

    TMODE_X1. These input source options are described below. testmode:[run|short|exc|zero_exc|10v_cal|dccal|testbus|testbusx1|?],[<chan_list>]; • RUN Run is the normal operating mode. The input source is the 28164 card’s input connectors. testmode:run,[<chan_list>]; • SHORT Short disconnects the input connectors and shorts the channel input to ground. Use this test mode to measure the filter/amplifier noise and DC offset.
  • Page 190 NOTE: Use of the Test Bus modes defeats the isolation of the input stage. When the 28164 Input Protect option is set to ON, these Test Modes are therefore disabled. See Section 3.2.5 for more information on the Input 28164 Operation and Maintenance Instructions Precision Filters, Inc.

  • Page 191: Protect Setting

    See 3.2.1 HC10 Sensor Resistive Calibration Polarity Setup (Sensor_R_Cal) (V). testmode:sensor_r_cal,[<chan_list>]; The testmode command for the 28164 has the following general format: testmode:[run|short|loopres|exc|zero_exc|10v_cal|dccal|testbus|testbusx1|?],[<chan_ list>]; For example, to set channels 0 and 3 to Test Bus mode, enter PF28K: testmode:testbus,0,3;...

  • Page 192: Input Protection (V)

    The 28164 card has a built-in safety switch that is used to isolate the earth-ground refer- enced ± 10 V Test Bus signal from the potentially high voltage of the input stage. It is crucial that the Test Bus mode voltage substitution capability not be invoked in the presence of high common mode voltage on the input wiring or damage may occur to the amplifier.

  • Page 193: Fault Check Interval (V)

    The fault check interval can be set from 1 to 255 seconds; the default value is 10 seconds. Note: The setting of fault_check_interval does not affect the rate at which overload status is checked. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 194: Fault Scan Enable (V)

    4.5.15 Mute Control (V) The mute command enables or disables the 28164 card’s Mute Mode feature. When Mute mode is ON, the channel is placed in a quiescent state, minimizing the possibility of coupling noise on properly functioning channels from a faulty or failed sensor. Mute mode is also useful to terminate unused channels in a safe and quiet state.

  • Page 195: Excitation Voltage (V)

    4.5.17 Excitation, Loop Resistance and Leak Resistance Monitors (V) The read_vl, read_il, and read_rl commands report the actual excitation voltage, excitation current, transducer loop resistance, and the leakage resistance. • Excitation Voltage Monitor (read_vl) Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 196: Gain Wizard Mode (V)

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. In Voltage Excitation mode, the 28164 has three Gain Wizard modes: • FSOUT/FSIN 28164 Operation and Maintenance Instructions Precision Filters, Inc.

  • Page 197: Display Gain Wizard Values

    The wizard_values command is used to display a report of all Gain Wizard values, including the current Gain Wizard mode and settings. The wizard_values command reports the following: • <wizard_mode><fsr><fsout><sens><sensor><exc><resv><actual_resv> Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...
  • Page 198 As an alternative, two or more Gain Wizard values can be displayed by using a semicolon to separate commands. In the following example, five Gain Wizard values for channel 0 are displayed. Entering PF28K: fsout:?,0;sensor:?,0;gain:?,0;sens:?,0;fsr:?,0; returns fsout:10,0; sensor:10,0; gain:1,0; sens:1000,0; fsr:10,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 199: Fsout/Fsin (V)

    For example, if the full-scale output for channel 0 is set to 10 V, entering PF28K: fsout:?,0; returns fsout:10,0; To change the full-scale output value on channel 0 to 5 V, enter PF28K: fsout:5,0; which returns Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 200: Sen (Channel Output Sensitivity)

    Note: Changing the value of FSIN will change the value SEN. The fsr command displays or sets the full-scale input value (FSIN) in V: fsr:[<value>|?],[<chan_list>]; For example, if the full-scale input is 10 V, entering PF28K: fsr:?,0; returns 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 201: Gain (Overall Amplifier Gain)

    Channel output sensitivity (SEN): Entering this value defines the overall channel output sensitivity delivered to the recording device expressed in mV/MU. The IGA automatically calculates FSIN and GAIN values. Setting the Gain Wizard mode to FSOUT/(FSIN*SENSOR) is done using: Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 202: Fsout (Full-Scale Output Voltage)

    The sensor command displays or sets the sensor sensitivity value in mV/MU: sensor:[<value>|?],[<chan_list>]; For example, if the sensor sensitivity for channel 0 is 10 mV/MU, entering PF28K: sensor:?,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 203: Fsin (Full-Scale Input)

    FSIN. Note: Changing the value of SEN changes the value of FSIN. The sens command displays or sets the channel output sensitivity (SEN) value in mV/MU: Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 204: Gain (Overall Amplifier Gain)

    In this mode, the gain is calculat- ed by entering three parameters—the input level of the attached recording device (FSOUT), the sensor sensitivity (SENSOR), and the excitation voltage (EXC)—and one of two additional parameters: 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 205: Fsout (Full-Scale Output Voltage)

    The SENSOR value is the value of the sensor sensitivity expressed in mV/V/MU. MU repre- sents the sensor’s physical unit of measurement (e.g. microstrain). The sensor’s nominal sen- sitivity is indicated on the sensor specification sheet. The sensor’s actual calibrated sensitivity Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 206: Exc (Excitation Voltage)

    For example, if the excitation voltage on channel 0 is 1 V, entering PF28K: exc:?,0; returns exc:1,0; To change the excitation voltage on channel 0 to 5 V, enter PF28K: exc:5,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 207: Fsin (Full-Scale Input)

    Changing the value of SEN changes the value of FSIN. The sens command displays or sets the channel output sensitivity value in mV/MU: sens:[<value>|?][,<chan_list>]; For example, if the channel 0 output sensitivity (SEN) is 10 mV/MU, entering PF28K: sens:?,0; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 208: Gain (Overall Amplifier Gain)

    Note: Direct entry of a gain value will change the values of FSIN and SEN. The gain command displays or sets the gain value (GAIN): gain:[<value>|?],[<chan_list>] For example, if the current GAIN is 1, entering PF28K: gain:?,0 returns gain:1,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 209: Pre-Filter Gain And Post-Filter Gain (V)

    Gain Wizard mode. See the examples in Section 3.2.16 to understand how the PRG and POG interact with the IGA and Gain Reserve settings. 28164 cards have an input overload detection threshold of 10 Vpk. The pre-filter gain range is determined by the Auto-Balance/Suppress mode: •...

  • Page 210: Post-Filter Gain (Pog)

    For example, if the gain reserve setting on channel 0 is x1, entering PF28K: resv:?,0; returns resv:1,0; To change the gain reserve setting to x2 on channel 0, enter 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 211: Actual Reserve

    Low-Pass Filter Type Options The 28164’s LP4FP low-pass filter has two filter type options: • Flat mode (LP4F): Flat mode has passband flatness equivalent to a Butterworth filter yet with a sharper roll-off. This mode is a good choice as an anti-aliasing filter and for applica- tions that require spectral analysis.

  • Page 212: Low-Pass Filter Cutoff Frequency

    • OFF enables the low-pass filter (keeps the filter in the signal path) Use the byp command to turn filter bypass on or off: byp:[on|off|?],[<chan_list>] For example, to bypass the low-pass filter on channel 0, enter PF28K: byp:on,0; which returns 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 213: Wideband Operation (V)

    For example, to set the wideband gain ratio to 0.5 on channel 0, enter PF28K: ratio:0.5,0 which returns ratio:0.5,0 If the FSOUT on the same channel is 10 V, then entering Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 214: Ac/Dc Input Coupling Option (V)

    PF28K: cpl:dc,0; which returns cpl:DC,0; 4.5.28 Auto Adjust Options (V) The 28164 card’s Auto Adjust options provide pre-programmed auto-adjust routines. The available routines in voltage excitation mode are as follows: • All Gains Auto Offset Correct • Channel Gain Adjust •...
  • Page 215 For example, to run the Channel Gain Adjust routine on channel 0, enter PF28K: gainadj:run,0 which returns gainadj:PASS,0; upon successful completion. Note: The PF28K: prompt is not displayed until the routine is complete. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...
  • Page 216 The command format to run the Auto Offset Adjust, Current Gain routine is: offsetadj_current:run,[<chan_list>]; The resulting correction is valid until the channel conditions change. The offset correction 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...
  • Page 217 For example, to set the Auto Offset Adjust, Current Gain on channel 0, enter PF28K: offsetadj_current:run,0; which returns offsetadj_current:PASS,0; upon successful completion. Note: The PF28K: prompt is not displayed until the routine is complete. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 218: 28164 Current Excitation Mode

    Sections applying to the Current Excitation mode have (I) appended to the end of the section title. If you are operating the 28164 card in Voltage Excitation mode, refer to Section 4.5, 28164 Voltage Excitation Mode, for information related to operating the card in that mode.

  • Page 219: Push-Push (Option P) (I)

    For example, to set the Expected Loop Resistance to 350 Ω on all channels, enter PF28K: rloop:350; which returns rloop:350,0; rloop:350,1; rloop:350,2; rloop:350,3; The Loop Resistance Tolerance is specified as a percent (%) change in the measured loop Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...
  • Page 220 Transducer Open (OPN) condition. The rloop_max command has the following syntax: rloop_max:[<value>|?],[<chan_list>]; For example, to set the Loop Resistance Maximum to 2000 Ω on all channels, enter PF28K: rloop_max:2000; which returns rloop_max:2000,0; rloop_max:2000,1; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 221: Hc10 Rtd_Cal Resistance (I)

    IEPE transducers. The IEPE Input mode continuously monitors the bias voltage levels and reports levels that exceed user-defined limits. The iepe_supply command sets a 28164 card with an HC14 configuration module to IEPE Input mode: Precision Filters, Inc.

  • Page 222: Auto Suppress (I)

    4.6.7 Auto Suppress (I) Auto Suppress mode is used to suppress DC at the amplifier input when the 28164’s built-in excitation supply is not being utilized. Auto Suppress mode suppresses the gage DC operating voltage offsets by injecting a pro- grammable DC offset derived from a precision 10 V reference at the channel input stage.

  • Page 223: Manual Auto Suppress Override

    • 0 625 V Auto Suppress Range The 0.625 V setting accommodates DC suppression of most externally excited bridge cir- cuits and allows for the full programmable gain range of the 28164 amplifier. Up to 0.625 volts of DC input suppression is accommodated.

  • Page 224: Test Mode (I)

    RUN, IZERO, SHORT, LOOPRES, CHOPPER_CAL, DC- CAL, TESTBUS, and TMODE_X1. These input source options are described below. • RUN Run is the normal operating mode. The input source is the 28164 card’s input connectors. Format: testmode:run,[<chan_list>]; • IZERO (Excitation Off) In IZERO test mode, the excitation current is set to zero (open circuit), and all other channel controls and functions are disabled.
  • Page 225 Format: testmode:testbusx1 ,[<chan_list>]; NOTE: Use of the Test Bus modes defeats the isolation of the input stage. When the 28164 Input Protect option is set to ON, these Test Modes are therefore disabled. See Section 3.3.4 for more information on the Input Protect setting.

  • Page 226: Input Protection (I)

    The 28164 card has a built-in safety switch that is used to isolate the earth-ground refer- enced ± 10 V Test Bus signal from the potentially high voltage of the input stage. It is crucial that the Test Bus mode voltage substitution capability not be invoked in the presence of high common mode voltage on the input wiring or damage may occur to the amplifier.

  • Page 227: Fault Check Interval (I)

    28164 LCS Commands Page 213 check_ovlds:[?]; There are two hard faults reported from the 28164 card in Current mode (I): • FIL (Pre-filter Overload) A pre-filter overload is detected if the signal exceeds 10 Vpk at the pre-filter stage. Over- load conditions typically are solved by reducing the overall gain or by increasing the gain reserve.

  • Page 228: Fault Scan Enable (I)

    4.6.13 Mute Control (I) The mute command enables or disables the 28164 card’s Mute Mode feature. When Mute mode is ON, the channel is placed in a quiescent state, minimizing the possibility of coupling noise on properly functioning channels from a faulty or failed sensor. Mute mode is also useful to terminate unused channels in a safe and quiet state.

  • Page 229: Excitation Current (I)

    The read_vl, read_il, read_rl, and read_rleak commands report the actual excitation volt- age, excitation current, transducer loop resistance, and the leakage resistance. • Excitation Voltage Monitor (read_vl) Excitation voltage is monitored and reported using the read_vl command: Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...
  • Page 230 –100 indicates 100 Ω of stray resistance on the –Exc lead. read_rleak:[?],[<chan_list>]; For example, if the –EXC lead on channel 0 has 10 Ω of stray resistance, then entering PF28K: read_rleak:?,0 returns read_rleak: – 10,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 231: Gain Wizard Mode (I)

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. In Current Excitation mode, the 28164 card has four Gain Wizard modes: • FSOUT/FSIN The FSOUT/FSIN mode is used when the channel signal requires amplification based on the maximum value of the full-scale input voltage and the required full-scale output volt- age.

  • Page 232: Display Gain Wizard Values

    • resv is 1 • actual_resv is 1 • gain is 1 • prg is 1 • pog is 1 • gageres is 350 • gagefactor is 2 • modulus is 1000000 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 233: Fsout/Fsin (I)

    The FSOUT value range is 0.625 V to 10 V. The fsout command displays or sets the full-scale output voltage (FSOUT) in V: Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 234: Sen (Channel Output Sensitivity)

    For example, if the channel 0 output sensitivity is 1000 mV/V, entering PF28K: sens:?,0; returns sens:1000,0; To change the channel output sensitivity on channel 0 to 500 mV/V, enter PF28K: sens:500,0; which returns sens:500,0; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 235: Fsin (Full-Scale Input)

    Note: Direct entry of a gain value will change the values of FSIN and SEN. The gain command displays or sets the gain value (GAIN): gain:[<value>|?],[<chan_list>] For example, if the current GAIN is 1, entering PF28K: gain:?,0 returns gain:1,0; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 236: Fsout/(Fsin*Sensor) (I)

    For example, if the full-scale output on channel 0 is 10 V, entering PF28K: fsout:?,0; returns fsout:10,0; To change the full-scale output on channel 0 to 5 V, enter PF28K: fsout:5,0; which returns 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 237: Sensor (Sensor Sensitivity)

    The fsr command displays or sets the full-scale input value (FSIN) in MU: fsr:[<value>|?],[<chan_list>]; For example, if the full-scale input on channel 0 is 1000 MU, entering PF28K: fsr:?,0; returns Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 238: Sen (Channel Output Sensitivity)

    See Section 4.6.22, Gain Reserve (V). Note: Direct entry of a gain value will change the values of FSIN and SEN. The gain command displays or sets the gain value (GAIN): 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 239: Fsout/(Fsin*Sensor*Exc) (I)

    The FSOUT value range is 0.625 V to 10 V in 0.1V steps. The fsout command displays or sets the full-scale output voltage (FSOUT) in V: fsout:[<value>|?],[<chan_list>]; For example, if the full-scale output on channel 0 is 10 V, entering PF28K: fsout:?,0; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 240: Sensor (Sensor Sensitivity)

    To change the sensor sensitivity on channel 0 to 20 mV/mA/MU, enter PF28K: sensor:20,0; which returns sensor:20,0; EXC (Excitation Current) The EXC value is the value of the excitation current applied to the bridge or sensor expressed 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 241: Fsin (Full-Scale Input)

    For example, if the full-scale input on channel 0 is 1000 MU, entering PF28K: fsr:?,0; returns fsr:1000,0; To change the full-scale input on channel 0 to 500 MU, enter PF28K: fsr:500,0; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 242: Sen (Channel Output Sensitivity)

    Note: Direct entry of a gain value will change the values of FSIN and SEN. The gain command displays or sets the gain value (GAIN): gain:[<value>|?],[<chan_list>] For example, if the current GAIN is 1, entering PF28K: gain:?,0 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 243: Fsout/(Fsin*Gf*R*Exc/Mod) (I)

    For example, if the full-scale output is 10 V on channel 0, entering PF28K: fsout:?,0; returns fsout:10,0; To change the full-scale output on channel 0 to 5 V, enter Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 244: Sensor (Sensor Sensitivity)

    The gage resistance (R) is the nominal resistance of the undeformed strain gage in Ω. The gage resistance should be listed on the sensor’s specification sheet. The gageres command displays or sets the gage resistance (GAGE RES) value in Ω: gageres:[<value>|?],[<chan_list>]; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 245: Gage Factor

    To change the gage factor on channel 0 to 1, enter PF28K: gagefactor:1,0; which returns gagefactor:1,0; MODULUS The elastic modulus defines the ratio of applied stress to the resulting strain of the material under measurement: Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 246: Exc (Excitation Current)

    The exc command displays or sets the excitation current (EXC) in mA: fsout:[<value>|?],[<chan_list>]; For example, if the excitation on channel 0 is 10 mA, entering PF28K: exc:?,0; returns 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 247: Fsin (Full-Scale Input)

    FSIN. Note: Changing the value of SEN changes the value of FSIN. The sens command displays or sets the channel output sensitivity (SEN) value in mV/MU: sens:[<value>|?],[<chan_list>]; Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 248: Gain (Overall Amplifier Gain)

    Although PRG and POG values are linked to the IGA and are typically set using the Gain Wizard and Gain Reserve, both PRG and POG values can be manually overridden. Entering 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 249: Pre-Filter Gain (Prg)

    Gain Wizard mode. See the examples in Section 3.3.16 to understand how the PRG and POG interact with the IGA and Gain Reserve settings. 28164 cards have an input overload detection threshold of 10 Vpk. The pre-filter gain range is determined by the Auto Suppress mode: •...

  • Page 250: Gain Reserve (I)

    (out-of-band plus in-band signal) can be relative to the in-band signal before the signal will clip. See the examples in Section 3.3.16 to understand how the actual reserve is 28164 Operation and Maintenance Instructions Precision Filters, Inc.

  • Page 251: Low-Pass Filter Options (I)

    Low-Pass Filter Type Options The 28164’s LP4FP low-pass filter has two filter type options: • Flat mode (LP4F): Flat mode has passband flatness equivalent to a Butterworth filter yet with a sharper roll-off. This mode is a good choice as an anti-aliasing filter and for applica- tions that require spectral analysis.

  • Page 252: Low-Pass Filter Bypass

    2) − can be set independently. Choose FIL for filtered output or WB for wideband output. The rear_out, aux1_out, and aux2_out commands are used to set and diplay the output type: rear_out:[wb|fil|?],[<chan_list>]; aux1_out:[wb|fil|?],[<chan_list>]; 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...

  • Page 253: Wideband Gain Ratio (I)

    The cpl command is used to set the balanced differential input coupling: AC coupled or DC coupled. AC coupling is useful for dynamic applications where the DC bias on the transducer, which can limit dynamic range, can be coupled out of the signal. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 254: Auto Adjust Options (I)

    PF28K: cpl:dc,0; which returns cpl:DC,0; 4.6.27 Auto Adjust Options (I) The 28164 card’s Auto Adjust options provide pre-programmed auto-adjust routines. The available routines in current excitation mode are as follows: • All Gains Auto Offset Correct • Channel Gain Adjust •...
  • Page 255 For example, to run the Excitation Auto Adjust on channel 0, enter PF28K: exc_adj:run,0; which returns exc_adj:PASS,0; upon successful completion. Note: The PF28K: prompt is not displayed until the routine is complete. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...
  • Page 256 The command format to run the Auto Offset Adjust, Current Gain routine is: offsetadj_current:run,[<chan_list>]; The resulting correction is valid until the channel conditions change. The offset correction 28164 Operation and Maintenance Instructions Precision Filters, Inc. Rev. A...
  • Page 257 For example, to set the Auto Offset Adjust, Current Gain on channel 0, enter PF28K: offsetadj_current:run,0; which returns offsetadj_current:PASS,0; upon successful completion. Note: The PF28K: prompt is not displayed until the routine is complete. Precision Filters, Inc. 28164 Operation and Maintenance Instructions Rev. A...

  • Page 258: 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 259 Support and Service Page 245 This page intentionally left blank Precision Filters, Inc. 28164 Installation and Programming Instructions Rev. A...

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