Tegam 1806 Instruction Manual
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Tegam 1806 Instruction Manual

Dual type iv power meter
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NOTE: This user's manual was as current as possible when this product was manufactured. However,
products are constantly being updated and improved. Because of this, some differences may occur between
the descriptions in this manual and the product received. Please refer to
of this manual.
TEGAM Inc.
Model 1806
Dual Type IV Power Meter
MODEL 1806
Instruction Manual
PN# IM140-CD
Publication Date October 2011
REV. J
©1999, TEGAM, Inc.All rights reserved.
www.tegam.com
for future updates

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  • Page 1 Publication Date October 2011 REV. J ©1999, TEGAM, Inc.All rights reserved. NOTE: This user’s manual was as current as possible when this product was manufactured. However, products are constantly being updated and improved. Because of this, some differences may occur between the descriptions in this manual and the product received.

  • Page 3: Table Of Contents

    STANDBY Indicator (DS2) ....................3-3 100-Ohm Operational Indicator (DS4) ................3-3 200-Ohm Operational Indicator (DS5) ................3-3 ERROR Indicator (DS3) ....................3-4 Model 1806 Switches ........................3-4 Power Switch (S1) ......................3-4 100/200-Ohm OPERATING RESISTANCE Switch (S2) ..........3-4 FLOAT/GROUND Switch (S3) ..................3-4 RF Power Level Measurement ........................
  • Page 4 Model 1806 Dual Type IV Power Meter Rear Panel Voltage Selector/Fuse Assembly......2-3 Model 1806 Operational Voltage Selection Process ................... 2-4 Model 1806 Dual Type IV Power Meter Front Panel Meters, Indicators, Switches and Connectors..3-2 Location of Digital Voltmeter in Typical Test Configuration ..............3-5 Location of Reference Voltage Generator in Typical Test Configuration ...........
  • Page 5 LIST OF TABLES Model 1806 Dual Type IV Power Meter Specifications ................1-2 Model 1806 Line-Voltage Fuse Requirements .................... 2-2 Comparison of Voltmeter Errors When Reference Voltage Generator Is and Is Not Used ......4-8 Required Test and Calibration Equipment ....................5-1...

  • Page 7: General Information

    Dual Type IV Power Meter shown in Figure 1-1. This information is in five sections that outline general information, installation, operation, principles of operation and maintenance. Discussions throughout this manual concerning use of the Model 1806 treat it as a stand-alone item. The TEGAM System IIA Automatic Power Meter Calibration System manual contains information for use, operational role, and cabling of the Model 1806 within a power sensor calibration system.

  • Page 8: Items Supplied

    16 lbs. (7.26 kg) Shipping: 20 lbs. (9.07 kg) ITEMS SUPPLIED The following items are supplied with the TEGAM Model 1806 Dual Type IV Power Meter: Assembly AC Power Cable, P/N 068-21, 1 ea. Assembly Temperature Control Cable, P/N 138-477, 2 ea.
  • Page 9 Instruction Manual Section I Dual Type IV Power Meter, Model 1806 General Information 18.35 (466.1mm) ERROR ERROR BOLOMETER TEMPERATURE BOLOMETER TEMPERATURE CURRENT CONTROL CURRENT CONTROL BOLOMETER BOLOMETER OPERATING OPERATING RESISTANCE RESISTANCE POWER STAND BY SENSE VOLTMETER SENSE VOLTMETER Figure 1-2 Model 1806 Dimensions (Top/Front)
  • Page 10 Instruction Manual Section I Dual Type IV Power Meter, Model 1806 General Information...

  • Page 11: Unpacking And Inspection

    TEGAM giving equipment model and serial numbers, so that necessary action can be taken. Under U.S. Shipping regulations, damage claims must be collected by the consignee; do NOT return the equipment to TEGAM until a claim for damages has been established.

  • Page 12: Power, Environmental And Mounting Requirements

    Next, remove the rear panel trim and slide the side panels out. Then, remove the side trim and install rack adapters on the left and right sides of the Model 1806. Re- attach the rear panel trim to the unit while leaving the side panels off. When rack mounting the unit, ensure access to the rear panel so that rear panel connections can be made.
  • Page 13 Instruction Manual Section II Dual Type IV Power Meter, Model 1806 Installation Operational Line Voltage Fuse Requirement 100 volts +5%, -10% at 48 to 62 Hz 0.75 Amp Slo-Blo 120 volts +5%, -10% at 48 to 62 Hz 0.75 Amp Slo-Blo 220 volts +5%, -10% at 48 to 62 Hz 0.4 Amp Slo-Blo...
  • Page 14 Instruction Manual Section II Dual Type IV Power Meter, Model 1806 Installation...

  • Page 15: Model 1806 Operational Voltage Selection Process

    Slide the board back into the module as shown in the diagram with the desired voltage still appearing as set in step 3. Replace the fuse with the proper fuse according to Table 2-1. Re-insert the new fuse by placing it in the fuse brackets. Figure 2-2 Model 1806 Operational Voltage Selection Process...

  • Page 16: General Operating Considerations

    SECTION III OPERATION GENERAL OPERATING CONSIDERATIONS Operation of the Model 1806 consists of: (1) cabling the unit to the device for testing, (2) selecting the proper voltage fuse and circuit board, (3) grounding or ungrounding the Model 1806, (4) selecting the proper operating resistance, (5) monitoring several indicators and...
  • Page 17 Instruction Manual Section III Dual Type IV Power Meter, Model 1806 Operation...

  • Page 18: Voltmeter Connectors (Tp5 And Tp6)

    (shown in Figure 3-1 on Bridge B). TP5 and TP6 complete the dc path between the Model 1806 and a digital voltmeter with a 6.5-digit resolution. DC voltage present at TP5 and TP6 is equivalent to the voltage across the thermistor element.

  • Page 19: Error Indicator (Ds3)

    DVM are grounded. The up position of S3 grounds the Model 1806. The down position of S3 floats the Model 1806. If either the thermistor mount or DVM or both are grounded, place the FLOAT/GROUND Switch in the FLOAT position. When both bridges are used, if any external voltage measuring instrument is grounded, place the FLOAT/GROUND Switch in the FLOAT position.

  • Page 20: Rf Power Measurement With Dvm Only

    The Precision Measurement System does not measure the RF power level directly. Instead, a DVM measures dc voltages before and after the application of RF power to the Model 1806 bridge. This necessitates calculation of the RF power level using data obtained from the DVM measurements.

  • Page 21: Location Of Reference Voltage Generator In Typical Test Configuration

    First, adjust the reference voltage generator to an output power level approximately equal to the Model 1806 bridge output measured by a DVM when no RF power is applied. Ensure stabilization of the RVG output throughout the entire measurement period.

  • Page 22: Principles Of Operation

    .01 to 18 GHz range. The key role of the Model 1806 within this system is the realization of the principle of dc substitution. It also provides temperature stabilization of up to two mounts each associated with one of the two bridges.

  • Page 23: Self-Balancing Bridge Circuits

    Figure 4-1 Functional Block Diagram of Precision Power Measurement System SELF-BALANCING BRIDGE CIRCUITS The Model 1806 contains two identical bridge circuits on individual PC boards that perform dc substitution independently from each other. Figure 4-2 shows a simplified schematic of one of the two bridge boards circuits depicting its interaction with system components internal and external to the Model 1806.

  • Page 24: Power Measurements

    Instruction Manual Section IV Dual Type IV Power Meter, Model 1806 Principles of Operation Figure 4-2 Simplified Schematic of Precision Power Measurement System POWER MEASUREMENTS The precision measurement system measures RF power in terms of a voltage change across the precision resistance leg.

  • Page 25: Rf Power Level Calculation

    Principles of Operation RF Power Level Calculation The Model 1806 measures high-frequency or microwave power in terms of a dc voltage change. The system does not measure the RF power level directly. Instead, it measures dc voltages before and after the application of RF power using a DVM or a DVM and an RVG.

  • Page 26: Temperature Control Board

    + 15-volt bridge board biasing power supplies. The + 5- volt control signal enables front panel controls and is applied only when the Model 1806 is in the ON mode. The + 20-volt potential powers the temperature control circuitry in both STANDBY and ON modes.

  • Page 27: Motherboard

    This change takes place because the RVG output and the Model 1806 output are in opposition when measuring with the double-pole, double-throw switch in the “Measure V ”...

  • Page 28: Precision Measurement System Errors

    _______________________________ Where: V = Change in voltage across the precision resistance leg of the Model 1806 bridge, = Model 1806 bridge output reading with no RF power applied, = Difference between Model 1806 output with no RF power applied and...

  • Page 29: Calculating Model 1806 Accuracies

    The specification for the Model 1806 Dual Type IV Bridge is given as: Substituted DC Power Accuracy: 0.03 2% W. The actual Model 1806 bridge is accurate to better than 0.003 up to 25mW. This means that the voltages measured across the 200 Ohm resistor in the self-balancing bridge give the bias power in the thermistor mount to better than 0.003%.
  • Page 30 = 2.40832V The  0.001% figure in the voltmeter accuracy, and the 0.003% for the 1806 are linear, and always in the same direction. The ability to correctly measure the 1 mW is thus directly affected by both. The 8 counts part of the accuracy can be of any sign or value within these limits, and is a function of the nonlinearity of the voltmeter.
  • Page 31 Instruction Manual Section IV Dual Type IV Power Meter, Model 1806 Principles of Operation 4-10...

  • Page 32: Introduction

    TROUBLESHOOTING PROCEDURES Where the 1806 in question is a component of a System II Automatic Power Meter Calibration System, troubleshooting procedures herein assume completion of system level diagnostics. The System II manual contains these diagnostics.

  • Page 33: Power-Up Operational Test

    Figure 5-1 shows the power-up test configuration and cabling procedure. The Model 1806 Dual Type IV Power Meter has two bridges (Bridge A and Bridge B) that have identical circuitry. The following procedure should be repeated for both bridges.

  • Page 34: Bolometer Current Meter Test

    This test ensures that the BOLOMETER CURRENT Meter (M1) indicates the correct dc bias level applied by the Model 1806 to the bolometer mount. Perform this test for both bridges. Figure 5-2 illustrates the cabling arrangement of the BOLOMETER CURRENT Meter test.

  • Page 35: Bridge Noise Test

    Figure 5-3 Bridge Noise Test Configuration Bridge Balance Test The bridge balance test checks the Model 1806 bridge circuitry balance at a 30 mW 1 mW operating bias. Figure 5-4 shows this test configuration. Perform this test for Bridge A and B.

  • Page 36: Temperature Control

    Maintenance Configure the test arrangement according to Figure 5-4 and the following steps: Connect the bolometer mount's positive mount bias connector to the Model 1806 red, positive BOLOMETER Mount Bias Connector (TP3), Connect the bolometer mount's negative mount bias connector to the Model 1806...

  • Page 37: Corrective Maintenance And Recalibration

    BOLOMETER CURRENT Meter, and bridge precision resistance, and bridge amplification. To ensure complete recalibration, follow all of the calibration procedures in the provided order. If recalibration cannot be achieved, return the Model 1806 to TEGAM according to the instructions at the end of Section V.

  • Page 38: Power Supply Assembly Test And Recalibration

    TEMPERATURE CONTROL Connector (J5) via the temperature control cable (P/N 138- 477), and Remove the top dust cover of the Model 1806 and ensure that all boards are properly and securely installed in their respective slots. POWER SUPPLY ASSEMBLY TEST AND RECALIBRATION This procedure recalibrates the power supply assembly within the Model 1806 and tests its line regulation.

  • Page 39: Bridge Board Circuitry Test And Recalibration

    (-13.5V to –16.5V) BRIDGE BOARD CIRCUITRY TEST AND RECALIBRATION The bridge board circuitry test checks the Model 1806 bridge board for amplifier offset and provides a calibration of bridge board components. For the bridge board circuitry test, use the same configuration as the power supply test and perform the following for both Bridge A and Ensure that the unit has been on for a least five minutes and has attained a state of thermal equilibrium.

  • Page 40: Calibration Of Internal Resistance

    Connect a DVM with microvolt sensitivity between the bridge board at TP2 and TP5 to act as a null detector, Turn the Model 1806 POWER Switch (S1) to the ON position and allow five minutes for stabilization, Adjust potentiometer R32 for a 0V 10V reading on the null detector,...

  • Page 41: Factory Maintenance

    Maintenance FACTORY MAINTENANCE If the procedures above do not correct Model 1806 malfunctions, and the Model 1110 is in proper working order, contact TEGAM. DO NOT send the instrument to TEGAM without prior authorization. When it is necessary to return an item, state the symptoms or problems, catalog and type number of the instrument, serial number of the item, and date of original purchase.
  • Page 42 The accuracy and calibration of this instrument are traceable to the National Institute of Standards and Technology through equipment that is calibrated at planned intervals by comparison to certified standards maintained in the Laboratories of TEGAM, Inc. How to Contact TEGAM TEGAM, Inc.

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