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Precision 28618 Installation And Programming Instructions

Octal programmable filter/amplifier
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Installation and Programming Instructions
Precision 28618
Octal Programmable Filter/Amplifier
Feb 11, 2022
Rev. B
Precision Filters, Inc.
240 Cherry Street
Ithaca, New York 14850
www.pfinc.com
ISO
9001
CERTIFIED QUALITY

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  • Page 1 Installation and Programming Instructions Precision 28618 Octal Programmable Filter/Amplifier Feb 11, 2022 Rev. B Precision Filters, Inc. 240 Cherry Street Ithaca, New York 14850 www.pfinc.com 9001 CERTIFIED QUALITY...
  • Page 2 Precision Filters’ Control GUI Software Copyright © 2022 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 Important: Please read and understand Section 2 of this manual, Setup and Installa- tion, before installing and operating 28618 circuit cards. The information and proce- dures in that section are designed to prevent damage to property and harm to the user.
  • Page 4 Setup and Installation section of this manual. Do not install substitute parts or perform any unauthorized modification to the product. Return the product to Precision Filters, Inc. for service and repair to ensure that safety features are maintained. See the “Support and Service” supplement in this document for information on how to contact Precision Filters.

  • Page 5: Table Of Contents

    2.5 28618 Card Configuration ........
  • Page 6 28618 Card Output Connector ........
  • Page 7 4.4 28618 LCS Command Set ........
  • Page 8 6.2 Service and Repair ..............88 28618 Operation and Maintenance Instructions Precision Filters, Inc.

  • Page 9: 28618 General Information

    PF28000-LCS-GUI-WIN software (GUI). This section is an extension of Sections 3-4 in the PF 28000-LCS-GUI-WIN programming instructions manual. Section 4, 28618 LCS Commands, is an extension of Section 5 in the PF 28000-LCS-GUI-WIN programming instructions manual. It describes the operation of specific 28618 card functions and commands using the LCS command set.

  • Page 10: 28618 Overview

    Precision’s 28618 Octal Programmable Filter/Amplifier cards allow for up to 128 channels of programmable precision filtering in one 28016 sixteen-card chassis. The balanced differential input of the 28618 allows for measuring bridge-type sensors or connecting to grounded loads without introducing ground loops.

  • Page 11: 28618 Features

    ×1/16 to ×1024 with fine resolution. Up to sixteen 28618 cards may reside in the 28000 system, providing up to 128 channels per chassis. In addition, the 28618 may be mixed with other conditioner cards in the 28000 family to meet unique signal conditioning requirements.

  • Page 12: Input Stage

    28000 signal conditioning cards. The 28618 has test modes called “SHORT” and “TEST BUS”, which are used by the 28000 Test Subsystem to verify that the 28618 is performing to factory specifications. Test modes simplify verification and trouble-shooting of the 28000 system.

  • Page 13: Amplifier

    ×1/16 to ×1024. The post-filter gain has resolution of better than 0.05% to enable precise system scaling of the 28618 outputs to match the full-scale input of the external record- ing device, given the transducer sensitivity and full-scale input in measurement units.

  • Page 14: Dc Outputs

    RMS to DC conversion on the channel outputs can be easily added by plugging the optional 28000-RMS/DC8 adapter on the 28618 front panel. The adapters are secured to the 28000 card by two screws. The output adapter does not interfere with the primary 28000 signal con- ditioning card outputs.

  • Page 15: 28618 Specifications

    ±10 Vpk x (200 kHz/f) for f > 200 kHz Input Protection: 25 V continuous (power on) 60 Vpk transient (1 ms pulse, 50% duty cycle) Offset Drift: 3.5 µV/°C, typical Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...
  • Page 16 In the event of a failed sensor, the 28618 Mute control places the channel in a quiescent operational state to minimize system noise. Mute mode is also useful to terminate unused channels in a safe and quiet state.
  • Page 17 1.0000 Fc –20 dB Frequency 1.7412 Fc 3.0248 Fc –40 dB Frequency 2.9555 Fc 5.6932 Fc –60 dB Frequency 4.5986 Fc 9.0980 Fc –80 dB Frequency 5.9465 Fc 11.8629 Fc Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...
  • Page 18 The monitor function is used by the 28000-?-TEST test subsystem and is available for the user to view channel 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...
  • Page 19 Operating: 0°C (32°F) to 40°C (104°F) Storage: –20°C (–4°F) to 70°C (158°F) Input and Output Connectors: The input and output connectors are integral to the 28618 card. Cutouts on 28000 frames allow connectors to pass through the backplane to mate directly with input cables.

  • Page 20: Accessories

    Accessories 1.6.1 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 connections and long service life. • CONN-IN-26D: High-density 26-pin D-shell mating input connector with machined crimp pins and metal backshell with strain relief •...

  • Page 21: 28618 Setup And Installation

    Before installing cards in the system, read the complete site preparation and installation pro- cedure for the 28000 System, which is located in Section 2 of the Precision 28000 Operation and Maintenance Instructions manual, to become familiar with the steps.

  • Page 22: Site Preparation

    Less than 90% (noncondensing) 2.2.3 Physical Requirements Connectors on the 28618 card extend through openings at the rear of the mainframe to provide the card’s input and output connections. Provide adequate room behind the mainframe for connecting cables to the rear panel.

  • Page 23: Storage, Transport, And Shipment

    2.4.3 Shipment Requirements Always use the original packaging materials to ship system components. A new container can be purchased from Precision Filters,Inc. The environmental conditions described in Table 3 must be maintained during shipment. Precision Filters, Inc. 28618 Installation and Programming Instructions...

  • Page 24: 28618 Card Configuration

    2.5.1 Input and Output Shield Lines If the 28618 cards have been previously installed in a mainframe, the cards must be removed from the system to set the input and output shield switches. The input shield line for each input channel can be set to open or connected to signal ground.
  • Page 25 Output Shield Switch (S3) Switch (S2) Output Connector Input Shield Input Connector Switch (S1) Figure 3 28618 Input Shield Switch (S1), Output Shield Switch (S2), and Output Sense Switch (S3) Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 26: Output Signal Ground Sense

    2.5.2 Output Signal Ground Sense If the 28618 cards have been previously installed in a mainframe, the cards must be removed from the system to set the ground output sense switches. Output ground sense is effective for driving circuits with grounded single-ended inputs and serves two purposes: •...
  • Page 27 Table 5 Signal Ground Output Sense Setup Channel Ground Sense S3-8 S3-7 S3-6 S3-5 S3-4 S3-3 S3-2 S3-1 Note: ON = Single-ended (SE) output; OFF = Ground sense (GND SENSE) Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 28: Install Cards

    Failure to do so may damage sensitive components. 28618 cards can be installed in any open card slot. The card slot designators for each of the 28000 mainframes are listed below. If cables or cable adapters are attached to the mainframe rear I/O panel, they must be compatible with the 28618 card.
  • Page 29 28618 Setup and Installation Page 21 When installing a 28618 card, follow these steps: Step 1 Check that the system power is off. Step 2 If a cable or adapter is attached to the mainframe rear I/O panel, check that the cable or adapter is the correct type for the card.

  • Page 30: Address Conventions

    [FRAME].[CARD].[CHAN]. For example, if the GUI is only connected to one mainframe with a 28618 card in the first card slot (= J0), the third channel on that card will display 0.00.02 as its address. See Section 3.2.2, Channel Iden- tification Section, for more information on the channel address display in the GUI.

  • Page 31: Install Cables

    • 28618 input signal cables • 28618 output signal cables The 28618 card provides eight conditioning channels (channels 0 through 7). Two high-density 26-pin input and output connectors on the rear of card extend through openings in the rear I/O panel of the mainframe.

  • Page 32: 28618 Input Connection

    28618 Setup and Installation Page 24 2.7.1 28618 Input Connection Table 6 describes the input connector pin assignments for the 28618 card. Table 6 28618 Input Connections Channel +Signal Shield –Signal Signal Gnd S1-8 S1-7 S1-6 S1-5 S1-4 S1-3 S1-2...

  • Page 33: 28618 Output Connections

    2.7.2 28618 Output Connections The 28618 card has one 26-pin output connector on the rear of the card extending through the rear of the mainframe supporting the output signals of the 8-channels (Figure 8). When the 28618 card is installed in a 28003-M5, 28004-M3/M5, 28008-M3/M5, or 28016-M5 mainframe, the mainframes provide an additional output connector per card on the rear I/O panel of the mainframes.

  • Page 34: 28002-M5 2-Slot Mainframe Output Connectors

    0. J301 is the output connector for a card installed in card slot 1. See Figure 9. Refer to the following table for the 26-pin high-density output connector pin assignments: • 8-channel cards (e.g. 28618), see Table 8. 26-Pin High-Density Output Connectors J300 &...

  • Page 35: 28004-M3/M5 4-Slot Mainframes

    The output connectors are located on the rear center panel of the mainframe. Refer to the following table for the 26-pin high-density output connector pin assignments: • 8-channel cards (e.g. 28618), see Table 8. 1 18 34 17 33 50...

  • Page 36: 28008-M3/M5 8-Slot Mainframes

    The output connectors are located on the rear center panel of the mainframe. See Figure 11. Refer to the following table for the 26-pin high-density output connector pin assignments: • 8-channel cards (e.g. 28618), see Table 8. 1 10 19...

  • Page 37: 28016-M5 16-Slot Mainframes

    The connectors, from right to left, are J300 through J315. See Figure 12. Refer to the following table for the 26-pin high-density output connector pin assignments: • 8-channel cards (e.g. 28618), see Table 8. J501 J215...
  • Page 38 Shield Ground –Signal +Signal Shield Ground –Signal +Signal Shield Ground –Signal +Signal Shield Ground –Signal +Signal Shield Ground –Signal +Signal Shield Ground –Signal +Signal Shield Ground Chassis Ground 9, 18 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 39: Auxiliary Front Panel Output Connector

    28618 Setup and Installation Page 31 2.7.3 Auxiliary Front Panel Output Connector The 28618 card provides a front-panel auxiliary output connector (Figure 13) for buffered output adapter modules available from Precision Filters. Table 9 shows the auxiliary output connector pin assignments. Pin C1...

  • Page 40: Buff-8Ch/(2)Hd26D Output Adapter

    • Switch set A sets the output sense for connector A channels 0 through 7. • Switch set B sets the output sense for connector B channels 0 through 7. 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...
  • Page 41 Figure 14 BUFF-8CH/(2)HD26D Buffer Module Table 10 Output Connector Pin Assignments for Both A and B 26-Pin Connectors Channel +Signal Shield –Signal Mating Connectors: CONN-OUT-26D PF pn A9405G1; CONN-OUT-26D-SC PF pn A9405G4 Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 42: 28000-Rms/Dc8 Output Adapter

    RMS to DC conversion. The fully buffered, single-ended outputs with ground sense are pro- vided on a multi-pin high-density (26-pin D) connector. The output adapter connects directly to the 28618 front-panel auxiliary output connector (see Table 9). OUTPUTS Figure 15 28000-RMS/DC8 output connector Pin assignments for the 26-pin output connector are the same as those given in Table 10 for the BUFF-8CH/(2)HD26D.

  • Page 43: 28618 Programming Instructions

    GUI-WIN manual, which describes installing the GUI, system functions, and GUI operations common to all 28000 conditioner cards. Refer to the 28618 specification sheet for detailed information and specifications for the card. Graphical User Interface (GUI) Install and start the 28000 GUI as described in Section 2 of the PF 28000-LCS-GUI-WIN manual.

  • Page 44: 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. Figure 17 Channel identification 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...

  • Page 45: 28618 Channel Operation

    Test mode provides four input source options: RUN, SHORT, TESTBUS, and TMODE_X1. Each is described below: • RUN Run is the normal operating mode. The input source is the 28618 card’s input connectors. • SHORT Short mode disconnects the input connectors and shorts the channel input to ground. This test mode is used to measure the filter/amplifier noise and DC offset.

  • Page 46: Overload Indicators

    Sec- tion 3.3.8, Gain Reserve. Figure 19 illustrates the GUI’s overload display for the 28618 card. The overload indicator reports on a channel’s condition. If a fault or overload condition is detected, the LED indicator icons are lit red.
  • Page 47 28618 Programming Instructions Page 39 Figure 20 Control Options panel Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 48: Mute Control

    Mute Control Figure 21 Mute buttons The Mute button (Figure 21) enables or disables the 28618’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 49: Gain Wizard Mode

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. 28618 cards support two 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 50: Gain Wizard: Fsout/Fsin

    (POG) fields. The distribution of PRG and POG is configured using the Reserve field. See Section 3.3.8, Gain Reserve. Note: Direct entry of the GAIN changes the values of FSIN and SEN. 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 51 • The IGA recalculates the values from Example 1: the GAIN is reduced to x2, and FSIN is increased to 5 V. With these settings, a 10 V change in the output signal represents 5 V of change in the input signal. See Figure 25. Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 52: Gain Wizard: Fsout/(Fsin*Sensor)

    SEN is the result of FSOUT divided by FSIN, expressed in mV/MU. SEN can be used to control what the channel output represents based on the FSIN. Note: Changing the value of SEN changes the value of FSIN. 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 53 See Figure 27. Example 2: In the same setup as Example 1, a read-out sensitivity of 200 mV/g is desired on the channel output. Figure 28 Example 2: FSOUT/(FSIN*SENSOR) Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 54: Pre-Filter Gain (Prg) And Post-Filter Gain (Pog)

    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. 28618 cards have an input overload detection threshold of 10 Vpk. Pre-filter gain values are 1 through 64 in x2 steps. Post-filter gain values are 1/16 (0.0625) through 16 in 0.05% steps for POG ≥...
  • Page 55 Page 47 Figure 30 PRG drop-down menu To enter a post-filter Gain (POG) value, click in the POG field and enter a value. See Figure Figure 31 POG entry field Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 56: Gain Reserve

    ACT, displays the actual reserve value calculated by the IGA. RESERVE can be displayed as a factor x or as a value in dB. (x is the default value.) 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 57 The calculated (ACT) reserve ratio is based on the following formula: (±10 Vpk pre-filter threshold / FSOUT) x post-filter gain (POG) Examples of using the Gain Reserve in conjunction with the Gain Wizard are provided in the following section. Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 58: Example Of Setting Gain Reserve And Prg/Pog

    Total Filter Input Signal Level = 5.51 V + 4.48 V = 10 V ≤ 10 Vpk pre-filter threshold FSOUT = (In-Band Signal Level) x (POG) = 4.48 V x 2.232 = 10 V 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...

  • Page 59: Filter Wizard

    Using the Filter Wizard From the main menu bar, select Wizards > Filter Wizard... to open the Filter Wizard panel, Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...
  • Page 60 Select Hz or kHz as desired. As the values in these fields change, the wizard calculates and displays corresponding values in the Output Amplitude and Output Phase Shift fields. Figure 37 Frequency Response Calculator 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 61 Enter these values either by clicking in a field and typing or by using the arrows to the left of the field. Click the buttons to the fields’ right to select Hz or kHz. Figure 39 Anti-Aliasing Calculator Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 62: 3.3.10 Low-Pass Filter Options

    Low-Pass Filter Type Options The 28618 low-pass filters have two filter type options: • Flat mode (LP4F): Flat mode filters have passband flatness equivalent to a Butterworth filter but with a sharper roll-off. This mode is a good choice for an anti-aliasing filter and for applications that require spectral analysis.

  • Page 63: Low-Pass Filter Cutoff Frequency

    Figure 41 Selecting a low-pass filter cutoff frequency (FC) Use the FC drop-down menu to set the filter’s cutoff frequency (Figure 41). The available cutoff frequencies depend on the 28618 card model number: • 28618-FX01 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz •...

  • Page 64: 3.3.11 Ac/Dc Input Coupling Option

    When the AC/DC input coupling is set to AC, Zero Suppress functions are inoperative and the Zero 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 42. 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...

  • Page 65: 3.3.12 Auto-Adjust Options

    28618 Programming Instructions Page 57 3.3.12 Auto-Adjust Options The 28618 card’s Auto Adjust options provide pre-programmed auto-adjust routines. The available routines are: • All Gains Auto Offset Correct • Channel Gain Adjust Note: Each adjustment has the potential to alter channel settings that may have been validated previously by running the Factory Acceptance Tests, which are traceable to NIST.
  • Page 66 Red indicates that at least one failure occurred during the routine. Step 3 When finished, click Done to close the Auto Adjust panel and return to the GUI. Figure 45 Auto Adjust controls 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...

  • Page 67: 3.3.13 Go/No-Go Test

    Figure 46 shows the Go/No-Go Test Selection panel, accessible from the main menu (Test →.Go/No Go...). Figure 46 Go/No-Go Selection panel Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 68: Fat (Factory Acceptance Test)

    → Card FAT...). From the FAT Test Selection Panel (Figure 47), one or more tests can be selected and run on one or more channels on the card. Figure 47 Card FAT Test Selection panel 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 69 28618 Programming Instructions Page 61 Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...
  • Page 70 28618 Programming Instructions Page 62 28618 Operation and Maintenance Instructions Precision Filters, Inc. Rev. B...
  • Page 71 28618 Programming Instructions Page 63 Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 72: 28618 Lcs Commands

    This section, 28618 LCS Commands, describes the LCS commands specific to the 28618 card and is an extension of the 28000-LCS-GUI-WIN Programming Instructions manual and Section 3, 28618 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 73: 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”: Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 74: 28618 Lcs Command Set

    For example, with a single 28618 card in Slot J0, entering PF28K: config; returns config: chan_count=8, cpc=8; config: [0.00.] 28618-FX02-LP4FP SN:185958-001 { 0 1 2 3 4 5 6 7}; config: [0.16.] 28000A-BIF2-FT SN:181372-001 {}; 4.4.2 Test Mode The Test Mode controls are used to manage the input source of a channel. Test mode provides 28618 Installation and Programming Instructions Precision Filters, Inc.
  • Page 75 • RUN Run is the normal operating mode. The input source is the 28618 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 76: Channel Mute

    4.4.3 Channel Mute The mute command enables or disables the 28618 card’s Mute 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 77: Gain Wizard Mode

    The IGA uses several user-specified parameters to calculate the channel gain and other measurement variables, eliminating the need for error-prone manual calculations. The 28618 has two 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 78 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; These various values are defined in more detail below. 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 79: Fsout/Fsin

    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 fsout:5,0; Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 80: 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 fsr:10,0; 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 81: 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. 28618 Installation and Programming Instructions Rev. B...

  • Page 82: 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; 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 83: 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. 28618 Installation and Programming Instructions Rev. B...

  • Page 84: 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; 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 85: Pre-Filter Gain And Post-Filter Gain

    Gain Wizard mode. See the examples in Section 3.3.8 to understand how the PRG and POG interact with the IGA and Gain Reserve settings. 28618 cards have an input overload detection threshold of 10 Vpk. Pre-filter Gain (PRG) Set pre-filter gain use the prg command: prg:[<value>|?],[<chan_list>];...

  • Page 86: 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 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 87: Actual Reserve

    Low-Pass Filter Type Options The 28618'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 88: Low-Pass Filter Cutoff Frequency

    • ON bypasses the low-pass filter (removes filter from signal path) • OFF enables the low-pass filter (keeps the filter in the signal path) Use the byp command to turn the low-pass filter bypass on or off: byp:[on|off|?],[<chan_list>] 28618 Installation and Programming Instructions Precision Filters, Inc. Rev. B...

  • Page 89: 4.4.10 Ac/Dc Input Coupling Option

    Note: When the AC/DC input coupling is set to AC, the Zero Suppress functions are inoperative. For example, to set the input coupling for channel 0 to DC, enter PF28K: cpl:dc,0; which returns cpl:DC,0; Precision Filters, Inc. 28618 Installation and Programming Instructions Rev. B...

  • Page 90: Auto Adjust Procedures

    Page 82 Auto Adjust Procedures 4.5.1 Auto Adjust Options The 28618 card’s Auto Adjust options provide pre-programmed auto-adjust routines. The available routines are as follows: • All Gains Auto Offset Correct • Channel Gain Adjust Note: Each adjustment has the potential to alter channel settings that may have been validated previously by running the Factory Acceptance Tests, which are traceable to NIST.
  • Page 91 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. 28618 Installation and Programming Instructions Rev. B...

  • Page 92: Maintenance

    The ±15 VA supply regulators provide regulated ±15 V to channels 0 through 3. The ±5 VB supply regulators provide regulated ±15 V to channels 4 through 7. Figure 50 illustrates the locations of the input power fuses on the front side of a 28618 card. See Table 12. Table 12 28618 Input Supply Fuses...
  • Page 93 28618 Maintenance Page 85 Output Connector F1 +18.2VB F2 +18.2VA F3 –18.2VB F4 –18.2VA F5 VD Input Connector Figure 50 28618 card input supply fuses Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...
  • Page 94 28618 Maintenance Page 86 Figure 51 shows the locations of the postregulator fuses for the individual filter/amplifier module assemblies. See Table 13. Table 13 28618 Filter/Amp Module Supply Fuses Location Supply Fuse CH0 + 15 VA 200 mA CH0 − 15 VA...

  • Page 95: Replaceable Parts

    F9 CH1 –15V F10 CH2 +15V F11 CH2 –15V F12 CH3 +15V F13 CH3 –15V Figure 51 28618 filter/amp module fuses Replaceable Parts There are no user-replaceable parts on 28618 cards. Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

  • Page 96: 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 97 Support and Service Page 89 This page intentionally left blank. Precision Filters, Inc. 28618 Operation and Maintenance Instructions Rev. B...

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