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barfield 2548H User Instruction Manual

Fuel quantity test set
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Corporate Headquarters
4101 Northwest 29th Street
Miami, Florida 33142
www.barfieldinc.com
Email: gsesales@barfieldinc.com
Copyright © 2014 Barfield Inc. All Rights Reserved.
2548H
FUEL QUANTITY TEST SET
USER INSTRUCTION MANUAL
M/N: 2548H, P/N: 101-00420
Doc. P/N: 56-101-00420
Revision C
November 7, 2014
____________________________________
BARFIELD, INC.

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  • Page 1 FUEL QUANTITY TEST SET USER INSTRUCTION MANUAL M/N: 2548H, P/N: 101-00420 Doc. P/N: 56-101-00420 Revision C November 7, 2014 ____________________________________ BARFIELD, INC. Corporate Headquarters 4101 Northwest 29th Street Miami, Florida 33142 www.barfieldinc.com Email: gsesales@barfieldinc.com Copyright © 2014 Barfield Inc. All Rights Reserved.
  • Page 2 2548H INSTRUCTION MANUAL CONTACT INFORMATION Users are requested to notify the manufacturer of any discrepancy, omission, or error found in this manual. Inquiries should include specific questions and reference the publication title, number, chapter, page, figure, paragraph, and effective date.
  • Page 3 OWNER WARRANTY REGISTRATION CARD to Barfield in order to validate the warranty and to ensure that you will receive updated information when published. You MUST have your name and address on file at Barfield as a registered user of this equipment, to be able to obtain the service covered by the warranty.
  • Page 4 REV. DATE DESCRIPTION OF CHANGE March 1, 2003 Initial Release. This manual supercedes 2548H-8005 Instruction manual and/or previously released Instruction manuals for model 2548H. 260-00729 February 3, 2009 Updated Company Information and logo. Page numbering and format were reformatted. 260-01053...
  • Page 5 2548H INSTRUCTION MANUAL MAINTENANCE AND REPAIR INFORMATION The manufacturer of this equipment does not recommend the user to attempt any maintenance or repair. In case of malfunction, contact the manufacturer, to obtain the list of approved repair facilities worldwide, ensuring that this equipment will be serviced using proper procedures and certified instruments.
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  • Page 7: Table Of Contents

    PUBLICATION BREAKDOWN ................1 INFORMATION PROVIDED WITH THE UNIT ............1 RECERTIFICATION ....................2 CHAPTER 1: GENERAL INFORMATION PURPOSE ......................5 2548H FRONT PANEL COMPONENTS ............... 6 CHAPTER 2: SPECIFICATIONS AND CAPABILITIES CAPABILITIES ....................9 SPECIFICATIONS ................... 9 PHYSICAL DATA ..................10 CHAPTER 3: OPERATION GENERAL INFORMATION ................
  • Page 8 Owner Warranty Registration Card ............2 Figure 3 Limited Warranty Statement Card ............3 Figure 4 2548H AC Fuel Quantity Test Set ............5 Figure 5 2548H Front Panel Components .............. 6 Figure 6 Insulation Test, Configuration #1 ............16 Figure 7 Insulation Test, Configuration #2 ............

  • Page 9: Introduction

    2. INFORMATION PROVIDED WITH THE UNIT Besides this User Instruction Manual, the 2548H Test Set is provided with the four items described below. A. An identification label similar to Figure 1 and located on the front bulkhead of the Test...

  • Page 10: Recertification

    2548H INSTRUCTION MANUAL B. The Owner's Warranty Registration card, (Figure 2), which is to be completed by the owner and returned to the Barfield within ten (10) days of purchase to insure validation of the warranty. Figure 2 OWNER WARRANTY REGISTRATION CARD C.

  • Page 11: Figure 3 Limited Warranty Statement Card

    2548H INSTRUCTION MANUAL Figure 3 LIMITED WARRANTY STATEMENT 56-101-00420 Rev. C Intro Nov / 07 / 14 Page 3 of 33...
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  • Page 13: Purpose

    There is an extensive selection of adapter cables manufactured by Barfield Inc. to be used with the 2548H Fuel Quantity Test Set. Please contact the Barfield Ground Support Test Equipment Sales department or visit the Barfield website at http://www.barfieldinc.com/ground.html...

  • Page 14: Front Panel Components

    ON/OFF switch if it was left in the ON position, and moves it to the OFF position. 2. 2548H FRONT PANEL COMPONENTS Note: Refer to Figure 5 for item number identification. Figure 5...
  • Page 15 2548H INSTRUCTION MANUAL TEST FUNCTION is a rotary switch, which selects one (1) of five (5) test functions. When the Test Set is placed in the CAP SIM 1 or CAP SIM 2 function, the meter may be substituted for a DC meter-type fuel quantity indicator.
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  • Page 17: Chapter 2: Specifications And Capabilities

    2548H INSTRUCTION MANUAL CHAPTER 2: CAPABILITIES AND SPECIFICATIONS 1. CAPABILITIES When the 2548H Fuel Quantity T/S is connected through the appropriate adapter cables, the following functions may be performed:  Measure capacitance of individual or interconnected tank sensor probes or probe simulators ...

  • Page 18: Physical Data

    2548H INSTRUCTION MANUAL 2. SPECIFICATIONS (continued) CAPACITANCE SIMULATORS Tank Range: 0 to 999.9 pF in 0.1 pF increments Accuracy: Same as Capacitance Bridge COMP Range: 10-400 pF continuously adjustable Accuracy: Set with Capacitance Bridge Maximum Input 75 V RMS, 220 V peak-to-peak (above 3 kHz, Tank Simulator limit...

  • Page 19: Chapter 3: Operation

    2548H INSTRUCTION MANUAL CHAPTER 3: OPERATION 1. GENERAL INFORMATION Fuel Quantity Indicating Systems provide the crew with an accurate display of the remaining fuel. The quantity of fuel shows on the fuel quantity indicator(s) in the flight compartment. The Fuel Quantity Indicating System includes the amplifier or signal conditioners (also known as the amplifiers) and the probe(s)/transmitter(s) that are installed in each tank (also knows as the Tank Unit).
  • Page 20 2548H INSTRUCTION MANUAL B. Methods of Calibration There are two (2) methods of Fuel Quantity System calibration:  Method 1: Dry Tank (PREFERRED)  Method 2: Wet Tank (ALTERNATE) Method 1 (Preferred) The Dry Tank method of calibration is done without fuel in the tank(s) and with the Tank Unit(s) dry.

  • Page 21: Preliminary

    2548H INSTRUCTION MANUAL 2. PRELIMINARY The user should be familiar with the 2548H Fuel Quantity Test Set and its accessory lead package. The tests and procedures performed are dictated by requirements of the particular fuel quantity system. System components should be tested and their reliability verified before attempting calibration.

  • Page 22: Precautions

    2548H INSTRUCTION MANUAL Connect the connector from the power supply adapter (furnished with the power supply) to the Test Set connector removed from the Battery Holder connector. Secure the adapter with the two (2) screws. Using the Power Supply: Connect the power supply's input to a properly rated power source.
  • Page 23 2548H INSTRUCTION MANUAL Open the appropriate circuit breakers. Access the appropriate amplifier. Disconnect and, if necessary, remove the amplifier. Ensure T/S power switch is set to OFF and the aircraft power to the fuel quantity system disconnected. Turn aircraft power off when adapter harnesses are inserted or removed.

  • Page 24: Figure 6 Insulation Test, Configuration #1

    2548H INSTRUCTION MANUAL Figure 6 INSULATION TEST, CONFIGURATION #1 Figure 7 INSULATION TEST, CONFIGURATION #2 56-101-00420 Rev. C Ch. 3 Nov / 07 / 14 Page 16 of 33...
  • Page 25 2548H INSTRUCTION MANUAL D. Insulation Test Procedure Note: When using the manufacturer's adapter cables, ensure that the adapter's connectors and box are not exposed to the airframe ground. (The connectors, box and shielding “float” from ground for tests. Touching or grounding could cause incorrect readings.) Do not touch the connectors or box while performing...

  • Page 26: Individual Tank Unit Insulation Test

    2548H INSTRUCTION MANUAL 5. INDIVIDUAL TANK UNIT INSULATION TEST Caution: Empty and purge fuel tanks before performing the Tank Unit Insulation test. Note: It may be necessary to set an aircraft tank selector switch to perform the desired test. Refer to the appropriate Maintenance Manual for additional information.

  • Page 27: System Capacitance Test

    2548H INSTRUCTION MANUAL Read the resistance on the MEGOHMS scale and verity that the resistance is not less than the resistance referenced for a shield to ground for the applicable aircraft. Note: The meter pointer may drift slowly after initial movement because of capacitance charging time or presence of moisture.
  • Page 28 2548H INSTRUCTION MANUAL Caution: Do not connect the connectors from the opposite end of the adapter cable. Connect the HI-Z COAX lead to the Test Set’s CAP BRIDGE HI-Z COAX receptacle and the LO-Z TANK lead to the Test Set’s CAP BRIDGE LO-Z TANK receptacle from the adapter cable.

  • Page 29: Individual Tank Unit Capacitance Test

    2548H INSTRUCTION MANUAL 7. INDIVIDUAL TANK UNIT CAPACITANCE TEST Note: The SYSTEM CAPACITANCE TEST should be done after an individual capacitance test and/or repair but before doing the system calibration. A. Bench Test Tank Units Installed Tank Units may be measured through connections as shown in Figure 11, or may be measured through bulkhead connectors using an adapter cable as shown in Figure 12.

  • Page 30: Amplifier Test/Calibration

    2548H INSTRUCTION MANUAL B. Capacitance Test Procedure Note: Refer to the appropriate maintenance manuals for individual tank unit locations and capacitance values by part numbers. Set the TANK CAP pF thumbwheels to the value of the Tank-Unit-Under-Test. (If configuration is in accordance with Figure 12, also rotate the adapter’s PROBE SELECTOR switch to the position of the Tank-Unit-Under-Test.)

  • Page 31: Figure 13 Capacitance Simulation, Configuration #1

    2548H INSTRUCTION MANUAL Other adapter cables with configuration connections are: ● With multiple connectors at the aircraft end, one of which is wired without tank unit circuits to the amplifier as shown in Figure 13. Figure 13 CAPACITANCE SIMULATION, CONFIGURATION #1 ●...

  • Page 32: Figure 15 Capacitance Simulation, Configuration #3

    2548H INSTRUCTION MANUAL ● With connectors for substituting the indicator as shown in Figure 15. The cable connections shown here are connected to the Test Set’s IND ± jacks. Figure 15 CAPACITANCE SIMULATION, CONFIGURATION #3 A. Setting “EMPTY” Adjustment Identify the type of adapter cable to be used and connect the Test Set, adapter cable, amplifier and the aircraft wiring as shown in Figures 13, 14, or 15 accordingly.
  • Page 33 2548H INSTRUCTION MANUAL (9) Close the appropriate circuit breakers. (10) Turn aircraft power to the fuel system ON. (11) Adjust the amplifier E (EMPTY) adjustment to achieve a reading of ZERO or EMPTY. B. Setting “FULL” Adjustment Rotate the TEST FUNCTION switch to CAP BRIDGE.

  • Page 34: System Calibration

    2548H INSTRUCTION MANUAL 9. SYSTEM CALIBRATION Caution: Before doing a system calibration, test and validate insulation, capacitance, and all other components of the system. Note: Refer to the operating instructions in the appropriate Maintenance or Systems Manuals of specific aircraft/systems and/or components.

  • Page 35: Figure 16 System Calibration (Method 1), Configuration #1

    2548H INSTRUCTION MANUAL ● Figure 16 shows an adapter cable with multiple connectors at the aircraft end. The Tank Unit circuits are wired in one branch to the connector attached to the amplifier. Figure 16 SYSTEM CALIBRATION (METHOD 1), CONFIGURATION #1 (MULTIPLE AIRCRAFT CONNECTORS) ●...

  • Page 36: Figure 18 System Calibration (Method 1), Configuration #3

    2548H INSTRUCTION MANUAL ● Figure 18 shows an adapter cable with BNC connectors to substitute the amplifier. (The cable connections are made to the Test Set’s IND ± jacks.) Figure 18 SYSTEM CALIBRATION (METHOD 1), CONFIGURATION #3 (BNC CONNECTORS) Note: Some procedures require adding extra capacitance to represent a wetted compensator.
  • Page 37 2548H INSTRUCTION MANUAL Release the COMP CAL pushbutton. Rotate the TEST FUNCTION selector to CAP SIM 1. Note: The CAP SIM 2 selection is used with “ratiometric” systems. Connect the adapter cable and the Test Set’s COAX, TANK, and COMP receptacles as specified for the system-under-test.
  • Page 38 2548H INSTRUCTION MANUAL Set the EMPTY adjustment for the corresponding system. Setting “EMPTY” Adjustment (with adapter cable) CAUTION Ensure Fuel Quantity/Refuel/Defuel power is off while accessing and before any harness or cable or connector is removed. Maintain power off while making connections.
  • Page 39 2548H INSTRUCTION MANUAL Setting “FULL” Adjustment Rotate the TEST FUNCTION selector to CAP BRIDGE. Set TANK CAP pF by entering the sum of ADD COMPENSATOR VALUE and EMPTY VALUE on the thumbwheel assembly. Set COMP SIM pF by entering the two left hand digits determined in step (b) on the thumbwheel assembly.

  • Page 40: Receiving

    2548H INSTRUCTION MANUAL CHAPTER 4: RECEIVING, SHIPPING, AND STORAGE 1. RECEIVING A. No special unpacking procedures are necessary. It is recommended that the factory- shipping container and packing materials be retained should it become necessary to reship the Test Set.

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101-00420

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