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Valhalla Scientific 4300B Operation Manual

Digital micro-ohmmeter
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Model 4300B
Digital Micro-Ohmmeter
Operation Manual
Need Help? Call 800-548-9806.
VA L H A L L A
www.valhallascientific.com
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©2015 Valhalla Scientific, Inc. All Rights Reserved.

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Summary of Contents for Valhalla Scientific 4300B

  • Page 1 Model 4300B Digital Micro-Ohmmeter Operation Manual Need Help? Call 800-548-9806. VA L H A L L A www.valhallascientific.com ©2015 Valhalla Scientific, Inc. All Rights Reserved.
  • Page 2 No liability will be accepted if returned without such permission. Due to continuing product refinement and due to possible parts manufacturer changes, Valhalla Scientific reserves the right to change any or all specifications without notice.

  • Page 3: Table Of Contents

    TATES 5-8........................19 EADING THE ISPLAY 5-9. 4300B C GPIB ......................20 OMMAND ET FOR Table 5-2. 4300B IEEE Commands - Quick Reference..................24 SECTION VI OPTION BCD..........................25 6-1..............................25 ENERAL 6-2. BCD P ..........................25 SSIGNMENTS Table 6-1. BCD Pin Functions..........................26 SECTION VII THEORY OF OPERATION ......................27 7-1.
  • Page 4 SECTION VIII CALIBRATION PROCEDURE....................34 8-1..............................34 ENERAL 8-2........................34 EQUIRED QUIPMENT 8-3........................34 OLTMETER ALIBRATION 8-4.......................35 URRENT OURCE ALIBRATION SECTION IX SPECIAL PROCEDURES......................37 9-1..............................37 ENERAL 9-2......................37 ONNECTIONS AND ETTLING 9-3............................37 OISY EADINGS 9-4........................38 ISCONNECTING THE ABLES SECTION X MANUAL CHANGES ........................40 ADDENDUM 10-1: 4350ATE SPECIFICATIONS....................41...

  • Page 5: Section I Unpacking & Installation

    The 4300B is designed to measure the low resistance of such items as coils, transformers, ballasts, heater elements, etc. Some features of the 4300B that give it an edge over competitive products are: "Charging Inductor" mode for reduced settling times.

  • Page 6: Instructions For Bench Use

    Rack Mounting Optional brackets are available for mounting the Model 4300B (4350ATE) in a standard 19" equipment rack. These are listed in Section 3. The size of the unit and the location of its center of gravity dictate that it must be supported on both sides along its entire length through the use of trays or slides.

  • Page 7: Section Ii Specifications

    2-1. General This section contains accuracy and operational specifications for the Model 4300B. See Addendum 10-1 for the 4350ATE High-Speed Digital Micro-ohmmeter specification changes. The accuracy specifications are valid for a period of one year from the date of calibration at a temperature of 22°C to 28°C. Outside this range, the temperature coefficient specification applies.

  • Page 8: Table 2-1. Ranges And Resolutions

    TABLE 2-1. Ranges and Resolutions Resistance Full Scale Voltages Resolutions Ranges 20mV 200mV 2mΩ .0001mΩ 20mΩ 0.001mΩ 200mΩ 00.01mΩ 100mA 2Ω/2000mΩ .0001Ω/00.1mΩ 10mA 100mA 20Ω/20000mΩ 0.001Ω/0001mΩ 10mA 100mA 200Ω 00.01Ω 100µA 10mA 2000Ω 000.1Ω 100µA 20000Ω 0001Ω 100µA ---------------Test Current Ranges--------------- TABLE 2-2.

  • Page 9: Section Iii Optional Equipment

    SECTION III OPTIONAL EQUIPMENT Available Options Listed below are the options available for use with the Model 4300B and 4350ATE Digital Micro-ohmmeters. Option RX-3: Rack Ears It is 2½ feet in length and is terminated on one Option "RX-3" is a set of rack ears that permit end in a 50 pin Amphenol connector with wire mounting of the instrument in a standard 19"...

  • Page 10: Test Leads

    3-2. Test Leads Option K: General-Purpose Lead Set Option MP-4/MP-5: Surface Probes Option "K" is a shielded, 4-wire Kelvin cable These probes permit rapid, repeatable set, forty-eight inches in length terminated in bonding testing on a variety of screened or "KCS"...

  • Page 11: Section Iv Manual Operation

    4-2. Connections Connections to the 4300B are made via 4 heavy-duty binding posts on the front panel. When using Valhalla test leads, the tabbed side of each banana jack is connected to the current terminals (see below). This ensures that current is carried in the largest conductor of the cable, and that the voltage input is shielded. A set of rear mounted terminals is available as Option JB-2.

  • Page 12: Setting Voltage And Test Current

    The Charging Inductor mode LED indicates when the standard current source compliance voltage of 7 volts is exceeded. In this situation the 4300B provides a booster shot in excess of 20V to reduce the settling time when a large inductive load is being measured. The display readings should be ignored when this LED is...

  • Page 13: Cable Disconnect Status Indicators

    When a highly inductive load is being measured, a potentially lethal back-EMF is induced when the test current is removed. The 4300B provides a discharge path for this back-EMF and monitors the voltage. The SAFE LED is illuminated when the back-EMF is less than five volts.

  • Page 14: Temperature Compensation

    The temperature sensors are connected to the 4300B via the front panel BNC connector. The temperature sensor may be extended with an Option "CK" compensator extension cable. The FAULT indicator is illuminated when the ATC mode is selected if the temperature sensor connections are not intact.

  • Page 15: Section V Remote Operation

    5-1. General This section of the manual contains instructions for operating the 4300B via the GPIB (IEEE-488) interface. For information regarding operation using the RS232C serial or Centronics parallel interface, refer to Section 10. Throughout this section it is assumed that the reader is already familiar with manual operation of the 4300B as described in Section 4.

  • Page 16: Bus Restrictions

    The other devices may be listeners (only able to receive data) or talkers (only able to send data), or both. The model 4300B is capable of talking and listening. The controller may address other devices and command them to listen or talk. Only one device may talk at any one time.
  • Page 17 Data is sent in 8-bit bytes on the DIO wires, usually (as in the 4300B) using the ISO-7 standard ASCII characters. Table 5-1 lists each ASCII character and the bus messages applicable to each.

  • Page 18: Setting The Ieee Address

    1) Each device on the bus must have its own unique address. Operating two devices at the same address will produce undefined results and is not recommended. 2) Avoid setting the 4300B to address 0 (all switches off) or to address 31 (all switches on) as this may interfere with the system controller.

  • Page 19: Remote And Local States

    The resistance data on the 4300B's display is always available to be read by the system controller. The 4300B does not require that a query or any other command be issued in order to retrieve it. Also, the 4300B does not need to be in REMOTE in order for the display to be read.

  • Page 20: 4300B Command Set For Gpib

    A-to-D converter. The result is returned in scientific notation, in ohms. As an example, assume that the 4300B is in the 2V and .1mA ranges and the front panel display indicates "10567" which is 10,567 ohms. The program above is executed.
  • Page 21 70 END The result of this program is to set the 4300B to the 2V, 100mA ranges and turn on the test current. The controller waits for 2 seconds (for settling), then retrieves the measured value. The 4300B is then returned to local mode.
  • Page 22 If the SRQ line is asserted, the controller should then perform a serial poll to determine which device requires service. The 4300B will return an ASCII zero (0) in response to a serial poll if it did not generate the SRQ. A non-zero number will be returned if it was responsible for asserting SRQ.
  • Page 23 D? reflects the present value of the output data terminator command C? reflects the test current status is the letter "U" if the 4300B senses that it is UNSAFE to disconnects cables; an ASCII space character indicates SAFE is the letter "H" if the 4300B's charging inductor mode has been activated; an ASCII space character indicates no charging inductor is the letter "F"...
  • Page 24 EOI Selects hold mode / Triggers single reading Selects continuous reading mode Selects normal mode (ATC off) Selects ATC mode On Returns 4300B to Local Configuration Status Word Query ( Q?V?I?SND?C?UHF ) Table 5-2. 4300B IEEE Commands - Quick Reference...

  • Page 25: Section Vi Option Bcd

    Signals are also provided for range information, overload, and end of conversion (EOC). A run/hold line is also provided to halt the 4300B A-to-D converter (voltmeter). Also refer to drawings 4300-079 and 4300- 609. The signals are TTL compatible (0 ≤ .8V, and 1 ≥ 2.4V) and will drive 1 LS TTL load.
  • Page 26 Pin 23 - RUN/HOLD A logic 1 (or open circuit) on this pin enables the unit to perform continuous measurements. When this line is taken low, the unit completes the measurement in progress and halts. A pulse of 300nS will initiate a further measurement.

  • Page 27: Section Vii Theory Of Operation

    General Description of Circuits This section describes the general function of each section of the Model 4300B. The paragraph titles used in this section refer to the block diagrams of Figures 7-1 and 7-2. "I" designates Figure 7-1 and "V" designates Figure 7-2.

  • Page 28: Detailed Circuit Descriptions

    7-2-11. Front Panel Controls (V) The Control Logic provides an interface between the front panel controls, displays, and the range circuitry of the 4300B. The Control Logic disables the front panel controls when the Option "TL-488" is fitted and the Remote LED is illuminated.

  • Page 29: Current Source

    This section describes in detail the operation of the main circuits of the Model 4300B. The reference designators used in this section refer to the drawings included at the back of this manual. 7-3-1 Current Source The operation of the Current Source is described in the following paragraphs. All components in this section can be found on Schematic 4300-072 Sheet 1.
  • Page 30 The gain of the buffer along with the reference voltage determines the A-D converter's full scale range. The A-D converter's full scale voltages are tabulated in Table 7-1. The gain is determined by the position of the voltage range selector on the 4300B front panel.

  • Page 31: Display Board

    If this happens, the FAULT LED is triggered through D204. Diode D204 provides level shifting to produce a TTL compatible signal to the control logic. 7-3-3. Display Board The following paragraphs detail the operation of the 4300B display board. All component references can be found on Schematic 4300-073 Sheets 1 and 2.

  • Page 34: Liquid Crystal Display

    7-3-3-1. Liquid Crystal Display Most of the LCD driver circuitry is contained in IC7. IC7 decodes the multiplexed BCD and provides proper signal levels necessary to drive the LCD. The multiplexed BCD from the A-D converter is buffered before going to IC7 via IC's 8 and 9. The four least significant digit lines are qualified by the Strobe signal from the A-D converter.

  • Page 35: Troubleshooting

    4300B. If the Model 4300B exhibits problems that cannot be eliminated by reviewing Sections 2, 4, 5, 7, or 9, the following guidelines have been established to help solve the problem.

  • Page 36: Section Viii Calibration Procedure

    The 4300B should also be regularly dusted using dry, compressed air to remove any debris. Before performing the calibration procedure that follows, the 4300B should be warmed up for at least 30 minutes with the top cover in place. The top cover should be replaced after each adjustment has been made.

  • Page 37: Current Source Calibration

    Connect the .1 ohm standard resistor to the 4300B using four-wire connections. Select the 2V and 10A ranges on the 4300B. Adjust RV102 for a reading of 100.00mΩ. Allow extra time for settling in this range. Keep the cover on as much as possible to ensure proper cooling of components.
  • Page 38 8-4-4. 0.1 Amp Adjustment Connect the 10 ohm standard resistor to the 4300B using four-wire connections. Select the 2V and .1A ranges. Adjust RV104 for a reading of 10000mΩ. 8-4-5. 10mA Adjustment Connect the 100 ohm standard resistor to the 4300B using four-wire connections. Select the 2V and 10mA ranges.

  • Page 39: Section Ix Special Procedures

    When measuring very low resistances of highly inductive loads, care should be taken to reduce 60Hz pickup at the input to the 4300B. The noise pickup is caused by the very high impedance of the load at 60Hz given by the formula:...

  • Page 40: Disconnecting The Cables

    Disconnecting the Cables When disconnecting the test leads from the load or from the 4300B, extreme care must be taken to ensure that the inductor has been discharged to prevent an extremely high energy, high voltage "kick-back" which can be LETHAL to the user and can certainly damage the 4300B.
  • Page 41 Using a Shorting Switch When using a shorting switch instead of the 4300B flyback diode, the current stored in the inductor discharges through the cables and switch. This current discharges with a time constant calculated from the formula below which is dependent on the test current that was used to charge the inductor:...

  • Page 42: Section X Manual Changes

    SECTION X MANUAL CHANGES _______________________________________________________________ Immediately following this page may be found any notices regarding Operation Manual changes, or operating considerations for special variations of the ohmmeter. Please refer to any applicable material before attempting to operate your Micro-Ohmmeter. Addendum 10-1 4350ATE Specifications...

  • Page 43: Addendum 10-1: 4350Ate Specifications

    The operating principles of the 4350ATE are very similar to the 4300B, and most points discussed in this manual apply to both instruments. The 4350ATE may be used manually (see Section 4) in all ranges with the following exceptions: 20mV/.1mA, 20mV/1mA, and 200mV/.1mA.

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