Tegam AVM-2000 Instruction And Service Manual

Tegam AVM-2000 Instruction And Service Manual

High sensitivity analog dc voltmeter/nullmeter

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AVM-2000
HIGH SENSITIVITY ANALOG DC VOLTMETER/NULLMETER
Instruction and Service Manual
PN# AVM2000-900
Publication Date: October 2010
REV. B
10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com

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  • Page 1 AVM-2000 HIGH SENSITIVITY ANALOG DC VOLTMETER/NULLMETER Instruction and Service Manual PN# AVM2000-900 Publication Date: October 2010 REV. B 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 2 Scientific Industries (ESI), Gertsch, Keithley Instruments, Lucas Weinschel, and Pragmatic Instruments. A complete list can be viewed on our Product Service Directory at www.tegam.com For more information about TEGAM and our products, please visit our website at www.tegam.com: or contact one of our customer service representatives at sales@tegam.com...
  • Page 3: Table Of Contents

    Reprogramming Total Instrument Reset (TIR) .............. 6-1 Memory sanitization ................6-1 VII. Preparation for Shipment Returning power meter for service ............7-1 Repacking for shipment ..............7-1 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 4 As Marked on Equipment: CAUTION – Risk of Danger DANGER – Risk of Electric Shock Earth Ground Terminal Frame or Chassis Terminal Earth Ground Terminal Alternating Current 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 5: Introduction

    The AVM-2000 is a multi-range analog DC Voltmeter/Nullmeter. It has 21 bipolar ranges from ± 100 nanovolts full scale to ± 1000 volts full scale in a 1-3-10 sequence. The AVM-2000 functions either as an isolated null detector or as an isolated analog voltmeter.
  • Page 6: Environmental Information

    > 80dB at 50Hz-60 Hz Meter specification measurements and terms per ANSI C39.1 With filter response time set to 100 ms. Otherwise, filter response times add to meter response time. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 7 Inputs shorted by a low EMF strap firmly connected between HI and LO input connections. (Lesser performance may be experienced when shorted input is accomplished by ZERO switch). Constant temperature. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 8 Section I – Introduction Line Voltage Selection: The AVM-2000 is delivered with an AC Power Module for operation from 120 ±10% VAC, 60 Hz. If the AVM-2000 is to be operated from a 240 ±10% VAC, 50-400 Hz power source, or the input power range needs to be changed from a previous selection, an alternative AC Power Module is required.
  • Page 9 2002 or Agilent 3458A.  Oscilloscope such as Tektronix model TDS-1000  Environmental chamber capable of housing the AVM-2000 with ability to regulate temperature from 10°C to 35°C ±0.1°C such as Thermotron model S-5.5 3800  Megohmmeter such as PPM model R1M-A ...
  • Page 10 Preparation For Calibration Or Repair Service Once you have verified that the cause for the AVM-2000 malfunction cannot be solved in the field and the need for repair and calibration service arises, contact TEGAM customer service to obtain an RMA, (Returned Material Authorization), number.
  • Page 11: Expedite Repair Form

    Include information such as measurement range, instrument settings, type of components being tested, is the problem intermittent? When is the problem most frequent?, Has anything changed with the application since the last time the instrument was used?, etc. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 12 Section I – Introduction Warranty TEGAM, Inc. warrants this product to be free from defects in material and workmanship for a period of one year from the date of shipment. During this warranty period, if a product proves to be defective, TEGAM Inc., at its option, will either repair the defective product without charge for parts and labor, or exchange...
  • Page 13: Preparation For Use And Installation

    CAUTION: When the AVM-2000 is to be stored for extended periods, pack the instrument into a container. Place container in a clean, dry, temperature-controlled location. If instrument is to be stored in excess of 90 days, place desiccant with items before sealing container.
  • Page 14: Principles Of Operation

    The heart of the AVM-2000 is in the Isolated Analog Subsystem. This is where nano-volt level signals are amplified via low-drift, low-noise, amplifiers to a level where they can drive a wide dynamic range 24-bit analog-to-digital converter and where initial analog filtering (10 Hz 4-pole Butterworth, low-pass) is applied.
  • Page 15 The Front Panel Subsystem control circuits consist of a microprocessor, LCD, 6 pushbuttons and 3 rotary encoders. The microprocessor continuously scans the switches and rotary encoders to detect any changes. It also regularly updates the LCD with the current AVM-2000 status as selected by the user with the pushbuttons and rotary encoder.
  • Page 16: Operating Instructions

    Voltage readings are displayed on a taut-band 4 1/2 inch, zero center, mirror-backed meter with dual scales (± 0 - 3 or ± 0 – 10). The scale used depends on the range selected. Figure 4.1 - AVM-2000 Front Panel 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 17: Front Panel Controls

    300V 0.1 sec to 100 sec 10MΩ, 100MΩ 1000V 0.1 sec to 100 sec 100MΩ Table 4-1 - Table of Ranges, Input Impedance and Available Filter Settings 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 18 The user can reset the control to the center (neutral—i.e. no offset) position by depressing and holding the control depressed for 5 seconds. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 19 OPERATE/ZERO pushbutton once returns the instrument to operation in the ZERO mode. Depressing the OPERATE /ZERO pushbutton once again returns the instrument to the OPERATE mode. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 20: Normal Operation

    A nominal temperature of +20°C provides a good working condition. A tolerance of ±5°C gives allowable temperature spread. Controlled temperatures also stabilize the aging process of the standards. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 21: Setting Zero Procedure

    Setting Zero Procedure Purpose: The AVM-2000 zeroing procedure is significantly different from older Null Meters such as the Fluke 845. It is important to remember that when adjusting for zero in the ZERO mode, the adjustments do not affect the OPERATE mode measurements. The benefit of zeroing in the ZERO mode allows the user to observer any possible drift in the instrument amplifiers since the last zero.
  • Page 22 8. Dial the Range -- Rotary Control/Pushbutton changing the range to 3 µV and repeat step 7 and repeat on every range up to and including 10 V. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 23: Maintenance And Servicing

    AVM-2000 Meter. Periodically inspect the AVM-2000 to make sure all the switch and control knobs are on tight. If they are loose, tighten with the proper size Allen wrench or a small flat blade screw driver as appropriate.
  • Page 24 1. Make sure the POWER switch is in the OFF (out) position. 2. Disconnect the AC Power Module (or other charging source) from the AVM-2000. 3. Remove the 8 screws (left and right sides of the instrument case) that attach the top cover to the front and rear panels.
  • Page 25 Section V – Maintenance and Servicing NOTE: Failure to keep components and/or the printed circuit board in the Isolated Analog Section clean of contaminants may compromise the performance of the AVM-2000. Avoid touching the electrical surfaces of the printed circuits, unless wearing clean gloves.
  • Page 26: Calibration Verification

    7. Press AVM-2000 INPUT OFFSET knob until I is displayed. Press and hold AVM-2000 INPUT OFFSET knob for approximately 5 seconds. 8. Press AVM-2000 INPUT OFFSET knob until a padlock symbol is displayed in the lower right of the LCD.
  • Page 27 16. Turn AVM-2000 RANGE knob one step clockwise and AVM-2000 LCD readout will indicate OUTPUT OFFSET. 17. Using AVM-2000 OUTPUT LEVEL knob, adjust for a zero ±3 mV indication on the Digital Multimeter. 18. Turn AVM-2000 RANGE knob one step clockwise.
  • Page 28 Section V – Maintenance and Servicing 30. Disconnect the Digital Multimeter and remove the short connected to AVM-2000 HI and LO terminals. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 29: Calibration

    Accuracy: ±0.072% of rdg Suggestion: Agilent 3458A Analog Meter Calibration 1. Connect the Meter Calibrator OUTPUT HI and LO terminals to AVM-2000 front panel HI and LO terminals, respectively. 2. Using AVM-2000 FILTER ▼ ▲ buttons, set FILTER: to 2.0 Sec.
  • Page 30 15. Edit the Meter Calibrator output amplitude until AVM-2000 analog meter indicates full scale. 16. Press the Meter Calibrator SCALE button. 17. Set the Meter Calibrator for 0.8 VDC and edit the output amplitude until AVM-2000 analog meter indicates this value.
  • Page 31 38. Using AVM-2000 RANGE knob, select the first AVM-2000 range listed in the Range column of Table 5.2. 39. Perform Manual Range Zero of the AVM-2000 except set the Meter Calibrator for 0 ADC in step 4.a.i. 40. Set the Meter Calibrator for the first positive value listed in the Applied column of Table 5.2 and set the OPR/STBY switch to OPR.
  • Page 32 2. Set the Digital Multimeter FUNCTION for DCV and AUTO range. 3. Using AVM-2000 RANGE knob, select the 1 mV range. 4. Perform Manual Range Zero of the AVM-2000 except set the Meter Calibrator for 0 mA DC and leave the Meter Calibrator in OPR.
  • Page 33 Section V – Maintenance and Servicing 16. Disconnect test setup. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com 5-11...
  • Page 34 4. Set the Meter Calibrator for 27 mV DC and set OPR/STBY switch to OPR. 5. Using AVM-2000 INPUT OFFSET knob to select the place value and the OFFSET ▼ ▲ buttons to select the numerical value, set AVM-2000 OFST: indication for -27,000.00 μV.
  • Page 35 Table 5.4 Isolated Output Calibration Performance Table Range (VDC) Applied (VDC) Accuracy Limits (VDC) 30 m ±27 m ±27.15000 to 26.85000 m Table 5.5 Offset Voltage Calibration Performance Table 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com 5-13...
  • Page 36: Troubleshooting

    NOTE: The AVM-2000 setup processes must be performed after making any repairs. Depending on the observed symptom, probable areas for investigation or repair in the AVM-2000 are indicated. Refer to disassembly instructions to gain access to the indicated areas, as well as reassembly instructions.
  • Page 37 Action: Replace the fuse with one of the same type and value. If the Power Supply Subsystem fuse continues to blow, the Power Supply Subsystem or one of the subsystems it feeds is defective. Action: Disconnect the balance of the AVM-2000 from the Power Supply Subsystem by removing connector J4.
  • Page 38 Section V – Maintenance and Servicing Symptom: AVM-2000 operates with the AC Power Module connected, but not properly on the internal rechargeable battery. Internal rechargeable battery needs to be charged. Action: Charge battery as described. There is a problem with the battery charging circuit.
  • Page 39 Action: Replace the Front Panel Subsystem. If not above, rotate the AVM-2000 RANGE control to the 100 mV range, and apply a 100 mV DC input signal to the AVM-2000. Using an oscilloscope (or pulse detecting logic probe), check for serial communications from the Isolated Analog Subsystem to the Front Panel Subsystem--19,200 baud 10 character bursts should be present at connector J2 Pin 6.
  • Page 40 Disconnecting the instrument from any non-measurement related connections to other apparatus (recorders, chargers, etc.) is a good way to isolate such problems. If the problem persists and all indications point to a problem with the AVM-2000, the problem lies with the Isolated Analog Subsystem.
  • Page 41: Reprogramming

    ZERO and OPERATE modes). Gain calibration may or may not be required. Memory Sanitization Procedure Since there is no external access to the any of the AVM-2000 memory, there is no memory system to sanitize on the AVM-2000. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 42: Preparation For Shipment

    CAUTION: AVM-2000 damage can result from using packaging materials other than those specified. 6. Retain copies of all shipping papers. NOTE: Refer to page 1-6 of the introduction for information on how to obtain a RMA from TEGAM. 10 TEGAM WAY • GENEVA, OHIO 44041 440-466-6100 • FAX 440-466-6110 • www.tegam.com...
  • Page 43 Section VIII – Storage Storage When the AVM-2000 is to be stored for extended periods, pack the instrument into a container. Place container in a clean, dry, temperature-controlled location. If instrument is to be stored in excess of 90 days, place desiccant with items before sealing container. The safe environmental limits for storing the AVM-2000 are -20 to + 60 °C / 0 - 80% non- condensing.

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