Tegam 1750 Instruction Manual
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Tegam 1750 Instruction Manual

High speed programmable microohmmeter
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1750
High Speed Programmable
Microohmmeter
MODEL 1750
Instruction Manual
PN# 1750-900-01
Publication Date: April 2017
REV. S
NOTE: This User's Manual was as current as possible when this product was manufactured. However,
products are constantly being updated and improved. To ensure you have the latest documentation,
refer to www.tegam.com.
10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com

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  • Page 1 NOTE: This User’s Manual was as current as possible when this product was manufactured. However, products are constantly being updated and improved. To ensure you have the latest documentation, refer to www.tegam.com. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 2: Table Of Contents

    Absolute Comparator Mode ..............4-7 % Comparator Mode ................4-8 Navigating the Menus ................4-9 Keypad Functionality ................4-9 Figure 4.8 Menu ................. 4-9 Ranges ....................4-10 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 3 Sample Programs ................5-24 SERVICE INFORMATION Cleaning ....................6-1 Calibration Procedure ................6-1 Calibration Verification Procedure ............6-3 Performance Verification Procedure ............6-4 Internal Jumpers ..................6-5 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 4 Preparation for Repair or Calibration Service ..........6-8 Expedite Repair and Calibration Form ............6-9 Warranty ....................6-10 Warranty Limitations ................6-10 Statement of Calibration ..............6-10 Contact Information ................6-10 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 5: Instrument Description

    IEEE-488, RS-422 and RS-232 applications. FEATURE OVERVIEW The 1750 microohmmeter is designed as a complete bundled solution for a wide variety of resistance measurement applications. Listed below are some of the features. 0.02% Basic Accuracy with 4½ digit resolution The 1750 microohmmeter is designed to perform resistance measurements with a 0.02% basic...
  • Page 6 The 1750 microohmmeter design makes it easy to integrate into new or existing designs. There are three comparator outputs which double as output bins 1, 2, and 3. The 1750 interface includes relay and TTL outputs for comparator and bin functions.
  • Page 7 GPIB, RS232, or RS-422 Communication Interfaces Standard GPIB, RS232, or RS422 user-selectable interfaces are standard communications for all 1750 units. A simple command sets ease the task of integration while the use of device dependent commands allows for specialized function execution.

  • Page 8: Accessories Sheet

    1583-9 – 3-meter GPIB buss cable 232. jaws is 12.7 mm (0.5 in.). Contact tips Cable length – 3 ft. are replaceable (part no. 47422) Cable length – 5 ft. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 9: Performance Specifications

    4. The Kelvin series lead resistances must not exceed the limitations as defined in Table1.1 or Table 1.7. Table 1.1 below is a summary of the ranges and resistances available with the model 1750. It also shows the full-scale voltage for each of the reference current ranges. The default ranges are printed in BOLD.

  • Page 10: Accuracy

    INSTRUMENT DESCRIPTION Table 1.2 summarizes the accuracy specifications for the model 1750, in the delayed mode. RANGE REFERENCE CURRENT 100 mA 10 mA 1 mA 100 μA 10 μA 1 μA 100 nA .02%+5ct 2 mΩ 20 mΩ .02%+4ct .02%+5ct 200 mΩ...

  • Page 11: Measurement Times

    Where the Line Period is 1/f, f = (50 or 60 Hz) and the Programmed Delay Time may range from 1mS to 250 ms. The Process Time is the time required to process the read data and is equal to about 1.9 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 12 In Table 1.6, the availability of Fast, (F), or Delayed, (D), Mode Triggering is illustrated. Delayed mode is available for each of the 19 resistance / reference current ranges. The Fast Triggering mode is limited to 8 of the ranges. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 13: Reference Current Modes

    Triggering via the front panel. Once triggered, two reference - REF cycles are released of which the latter pulse will be used to take the actual reading. COMPLETE READING 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 14: Miscellaneous Specifications

    Operating Temperature: 0 to 50 °C (32 to 122 °F), <80% RH; (Non-Condensing) • Storage Temperature: -35 to 60 °C (-31 to 140 °F), <90% RH (Non-Condensing) • EMC: EN 61326-1:2013 • 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 1-10...
  • Page 15 Input: <100 VA, 108-132 VAC or 216-264 VAC, at 50/60 Hz. Fuse: • For 108-132 V Operation; use 0.8 A @ 250 V, 5X20 mm, fast acting, TEGAM PN#FU-800 For 216-264 V Operation; use 0.5 A @ 250 V, 5X20 mm, fast acting, TEGAM PN#FU-500 •...

  • Page 16: Test Lead Requirements

    INSTRUMENT DESCRIPTION TEST LEAD REQUIREMENTS From the factory, the 1750 microohmmeter is equipped with the choice of either 17501 Kelvin Klips or 17502 Kelvin Spade Lugs. These are both 4-wire Kelvin input cables. Four-wire Kelvin-type cables must be used with the 1750 in order to obtain an accurate resistance measurement.
  • Page 17 Also, for resistance measurements greater than 200 kΩ, the programmable delay time should be set to a minimum of 100 ms to allow adequate settling of the reference current. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 1-13...

  • Page 18: Broken Lead Detection

    “*****” is displayed on the LCD. Positive Kelvin Loop Negative Kelvin Loop Fig 1.2: Continuity Test Paths for Broken Lead Detection 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 1-14...

  • Page 19: Preparation For Use

    PREPARATION FOR USE UNPACKING & INSPECTION Each 1750 microohmmeter is put through a series of electrical and mechanical inspections before shipment to the customer. Upon receipt of your instrument unpack all of the items from the shipping carton and inspect for any damage that may have occurred during transit. Report any damaged items to the shipping agent.

  • Page 20: Symbols

    “Miscellaneous Specifications” or “Repair Parts” sections of this manual. Refer fuse replacement to qualified service personnel. Do Not Use in Explosive Environments The 1750 microohmmeter is not designed for operation in explosive environments. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 21: Do Not Operate Without Covers

    A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 22: Line Voltage Selection

    2. Change the line selector switch on the power supply printed circuit board from 120 VAC to 240 VAC. The switch is located toward the rear panel of the 1750 on the top most PCB board. Refer to the figure below: 3.

  • Page 23: Quick Start Instructions

    POWER THE UNIT The power supply of the Model 1750 is designed for 50-60 Hz operations and a voltage range of 108- 132 & 216-264 VAC. Review the line voltage selection procedure on page 2-4 before proceeding.

  • Page 24: Test Lead Requirements

    QUICK START INSTRUCTIONS The 1750 factory settings are usually adequate to meet the needs of most manual, low inductance, resistance measurement applications. However, in high-speed, automated resistance measurement, it is often desirable to optimize the instruments settings to obtain the highest accuracy and throughput.

  • Page 25: Operating Instructions

    This section is designed to give the user an in depth description of the numerous parameters and operating modes available from the Model 1750. The user will be exposed to additional topics that will enhance the integration of the Model 1750 into their application.

  • Page 26: Front Panel Description

    If the internal calibration jumper is enabled, pressing this button will switch the 1750 into debug mode. This feature is for factory use only. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 27: Rear Panel Description

    VAC Input – 120/240 V @ 50/60 Hz, power input. Line fuse is accessible through this input. Cooling Fan – 20 CFM maximum airflow. Operation is 5 V @ 240 mA. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 28: Display Modes

    OPERATING INSTRUCTIONS DISPLAY MODES When the power key is depressed, AC power is applied to the 1750. During the power cycle, the 1750 operating system initiates and the display will show the product identification information. The 1750 digital software revisions appear below the product identification. This display will be visible for about two seconds and then the 1750 will resume operation under the same set-up parameters as when it was last turned off.

  • Page 29: Resistance Mode

    Open Lead Detection The 1750 includes an Open Lead Detection feature, which is active in the 20 Ω, 2 Ω, 200 mΩ, 20 mΩ, and 2 mΩ ranges. It verifies the continuity of the test leads and contacts when the 1750 is operating in either of the two delayed trigger modes, (Delayed Continuous or Delayed Trigger).

  • Page 30: Reading Hold

    When the 1750 is in AUTO RANGE mode, then the AUTO RANGE LED on the right hand side of the front panel will be illuminated.

  • Page 31: Absolute Comparator Mode

    LED states. All comparator outputs are disabled when the 1750 is operating in the resistance mode. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 32: Comparator Mode

    In the upper right-hand corner of the display, the user-defined nominal value is displayed. High and low % comparator values are calculated by the 1750 from the user-defined nominal value. In the illustration above, the nominal value is set for 10 MΩ. The high limit is set for all readings above 11.0 MΩ, (10 M+1 M) and the low limit is set for all readings below 9 MΩ...

  • Page 33: Navigating The Menus

    These buttons are highlighted in white on the 1750 front panel. Each key is labeled with its primary and secondary functions. The primary function of each button is a short cut to the instrument’s default resistance and reference current ranges.

  • Page 34: Ranges

    200 Ohm@10mA 20 Ohm@1mA MENU/CLEAR REFERENCE 200 Ohm@1mA 2K Ohm@1mA 200 Ohm@100uA 2K Ohm@100uA 20K Ohm@100uA 20K Ohm@10uA 200K Ohm@10uA 2M Ohm@1uA 20M Ohm@100nA TRIGGER MODES 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 4-10...

  • Page 35: Delay Time

    Allowing a longer settling period allows the Delayed Modes to produce a more accurate reading. This is a commonly used feature for measuring high resistances or components with a slight inductive characteristic. MENU/CLEAR DELAY Delay (1-250 mS) DISPLAY MODE 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 4-11...

  • Page 36: Absolute Comparator Limits

    Compare ABSOLUTE COMPARATOR LIMITS Comparator limits are entered into the 1750 in counts. Because the 1750 is a 4½ digit meter, the maximum entered value would be 22999 counts. The lowest possible entry would be 00000. For the high limit, any value less than the high limit value may be entered for the low limit and any limit lower than the high limit may be entered as the lower limit.

  • Page 37: Communication Interface

    30 and pressing [ENTER]. The existing address may be retained by simply pressing [ENTER]. There are no user-defined settings available for the RS232 or RS422 communication modes. GPIB GPIB (IEEE-488.2) ADDRESS RS232 INTERFACE MENU/CLEAR RS422 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 4-13...

  • Page 38: Store Setup

    Location 1-9 LINE FREQUENCY In this menu, the user selects either 50 or 60 Hz operation for line cycle integration. 60 Hertz MENU/CLEAR 50/60HZ 50 Hertz 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 4-14...

  • Page 39: Pin Function

    The 1750 microohmmeter has an auto-correction feature that allows internal compensation of the instrument for temperature changes in the operating environment. In earlier firmware revisions, the auto correction feature was user-selectable. Currently, all 1750 units have this feature enabled and the user cannot modify the feature.

  • Page 40: The Pin Function

    OPERATING INSTRUCTIONS THE PIN FUNCTION Because the 1750 has a significant number of measurement parameters that are user defined and may have an impact on measurement accuracy, a lockout feature is supplied with each 1750. This lockout feature is referred to as a PIN function, which prevents unauthorized access to instrument settings critical to the operation of the 1750.
  • Page 41 NOTE: This “back door” will only allow the Pin function to be disabled. The only way to reactivate the PIN function is to enter the original PIN code. Contact TEGAM for support in reactivating the PIN number if it is permanently lost.

  • Page 42: Programming & Interfacing

    It will provide all of the necessary information required to integrate the 1750 easily into a working test stand. Only one communication interface may be used at a time. The 1750 is shipped from the factory with a default RS232 communications setting. To change the communications setting, refer to the menu navigation chart on page 4-13.

  • Page 43: Rear Panel

    Thus, the trigger input’s scan interval is dictated by the measurement mode and settings of the model 1750. Please refer to the section titled Reference Current Modes in Section 1, for illustrations of various modes and how to determine their approximate measurement times.

  • Page 44: Trigger Out Connector

    The second BNC connector provides a TTL level, Done Pulse. The Reading Done outputs’ normal state is +5 V. Once the 1750 completes a measurement cycle, the state of the output goes to a low state for approximately 4.5 ms, and then returns to +5 V. Its state is updated after each read cycle. Below is an illustration that displays the functions of the TTL input and output.

  • Page 45: Using The Trigger Outputs

    When this condition is met, the PLC detects that the reading cycle has been completed confirming a reading complete condition. 4. Send a command to return the 1750 display mode back to one of the comparator modes. This will enable the comparator outputs and create a reading in process condition for the PLC.

  • Page 46: Connector J8

    Rear Panel View Figure 5.3: J8 Connections HIGH COMPARATOR HIGH TTL OPEN COLLECTOR OUTPUT COMPARATOR LOW TTL OPEN COLLECTOR OUTPUT COMPARATOR GO TTL OPEN COLLECTOR OUTPUT 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 47 Normally Open and Normally COMPARATOR RELAY closed relay outputs for 30 VDC @ 1 A 125 VAC @ 0.5 A OUTPUTS comparator state. Table 5.2: Connector, J8 Electrical Requirements 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 48 NOTES: Approximately 5.5 ms after a valid TTL output is generated, a valid output state may be read from the HI, LO, GO relay output contacts. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 49: Rs232 Communication

    Figure 5.4: RS-232 Connector (J4) Please refer to CA-22-36 in the accessory sheet. RS232 Settings The Model 1750 comes from the factory preset with the RS232 protocol. These settings are not user definable. A null modem connection is not required.. Handshake...

  • Page 50: Rs232 Interface Command Summary

    20 kΩ range @ 10 uA Test Current 200 kΩ range @ 10 uA Test Current 2 MΩ range @ 1 uA Test Current 20 MΩ range @ 100 nA Test Current 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...
  • Page 51 Force Execution of preceding Command Message Terminator Append <CR><LF> as terminators Append <LF><CR> as terminators Append <CR> as terminators Append <LF> as terminators Table 5.3: RS232 Interface Command Summary 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 5-10...

  • Page 52: Rs232 Device Dependent Commands Supplementary Information

    2) The previous trigger must be stopped and a new trigger must be instructed; 3) A new value must be returned after the 1750 completes a reading. Below is a breakdown of the trigger modes and commands via GPIB interface.

  • Page 53: Rs232 Hierarchy Of Commands

    Immediate Commands – I, G, T, E, X, There are a total of 5 immediate commands used via RS232. “I” – Initializes the 1750 and executes a device clear. When the I command is used the 1750 returns to its original factory default settings.

  • Page 54: Power Up And Device Clear Defaults

    Delay time to 123 mS then set the instrument to Resistance Range #2. If an “E”, command is sent to the 1750, it will return a reading to the controller in the form of ASCII characters. The reading will be in the form of a numeric 4 ½ digit value followed by a SI unit prefix, (n, u, m, k, or M), and Ohm units.

  • Page 55: Reading Via Rs232 Interface

    PROGRAMMING AND INTERFACING Reading via RS232 Interface This is a basic example for setting the 1750 to the 20 kΩ range and taking a reading. Windows supplies HyperTerminal as a standard accessory and may be used for executing simple RS232 functions.
  • Page 56 PROGRAMMING AND INTERFACING IEEE-488.1 OPERATION The Model 1750 may operate in either GPIB or RS232 communication interface. From the factory, the 1750 is configured for GPIB communication at address 12. To change the GPIB address, select [MENU]>[INTERFACE]>[GPIB]>[ENTER]. You will be prompted to enter a new GPIB address. Type in the new GPIB address and press [ENTER].

  • Page 57: Gpib Command Summary

    PROGRAMMING AND INTERFACING GPIB Command Summary Below is a summary of the GPIB commands that may be used while programming the 1750. It is recommended that the user have some familiarity with the IEEE-488 specification before continuing with this section. Programming for the Model 1750 is performed by using Device Dependent Commands from the buss to the instrument.
  • Page 58 Force Execution of preceding Command Message Terminator Append <CR><LF>EOI as terminators Append <LF><CR>EOI as terminators Append <CR>EOI as terminators Append <LF>EOI as terminators Table 5.6: GPIB Command Summary 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 5-17...

  • Page 59: Gpib Device Dependent Commands Supplementary Information

    Issue a T4, T5, T6, or T7 to select and arm the new trigger. Issuing the GET command on the bus will stop the old trigger and provide a new trigger to begin the next acquisition. b) An address to Talk on the bus will return a reading after it has been completed by the 1750. Returned ASCII Values: a) “1.2345 mOhm”...

  • Page 60: Serial Polling

    “AND”ed with the 1750 status byte. The resulting byte indicates whether an SRQ will be generated by the 1750. A true status is indicated by a binary 1 in the status byte. The assignment of bits for the 1750-status byte are as follows:...
  • Page 61 Examples of some commonly returned values from the bus: “65” indicates that the 1750 caused an SRQ due to a reading done condition. Bit #6 is set in addition to bit #0. The decimal sum of these bits is equal to 65.

  • Page 62: Self Test

    For example, in the command line, “C2R5X”, C2 calls for memory location #2 to be restored into the 1750. The command R5 will be ignored since the C2 command already defines a resistance range. If the presets in location #2 are to be restored with the newly defined resistance range, R5, then the following line of code needs to be implemented, “C2XR5X”.
  • Page 63 Returns the low % comparator limit in counts. Self Test Response “Self test PASS” Verification of self-test successful – no reported errors. Table 5.7: GPIB Status Command Summary 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com 5-22...

  • Page 64: Power Up And Device Clear Defaults

    Below are some BASIC instructions for making a 1 kΩ measurement of a resistor via the interface bus. This will be executed by programming the 1750 to the 2 kΩ @ 1 mA range, fast one-shot trigger, and take a resistance reading.

  • Page 65: Sample Programs

    PROGRAMMING AND INTERFACING Sample Programs The examples below are written in HP Basic for Windows on a PC. The 1750 is set at GPIB address 12 and the GPIB card is set at location 700 in the PC. a) This example uses HP Basic for Windows on a PC. The 1750 address is 12 and the IEEE-488 interface card address is at 700 in the PC.
  • Page 66 This next example is a combination or examples a & b above, except that it will SRQ if an error occurs and display the 1750 status. It will then trigger the 1750 and wait for a reading done SRQ before taking a reading from the unit.

  • Page 67: Service Information

    Equipment: Full Scale Calibration Standard; 17501 Kelvin Klip™ Leads Preparation: Power up the model 1750 and allow the unit to stabilize for 24 hours in a temperature and humidity controlled environment. The temperature and humidity must be 23 °C ±1.0 °C, (73.4 °F ±1.8 °F), and a 50% (±5%) relative humidity environment.
  • Page 68 This notates the completion of the calibration process. Turn off the unit and disconnect the power cord. Remove the top cover and move jumper P9 back the operate position. Install the top cover and proceed to the Calibration Verification procedure. 10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110 • sales@tegam.com...

  • Page 69: Calibration Verification Procedure

    Calibration Verification Procedure Scope: The Calibration Verification procedure should be performed immediately after the calibration adjustment procedure. These specifications are tighter than the advertised 1750 specifications in order to insure a safe margin between the instrument’s calibration adjustments and its advertised specifications.
  • Page 70 Equipment: Full Scale Calibration Standard; 17501 Kelvin Klip™ Leads Preparation: Power up the Model 1750 and allow the unit to stabilize for a minimum of 30 minutes. 1. With the instrument Time Delay set to 111 ms when in the Delayed Continuous Mode (steps 2-12), manually select the 2 mΩ...

  • Page 71: Internal Jumpers

    4. Jumpers should be visible and can be modified. Calibration Enable Jumper To change the 1750 from operating mode to calibration mode, move jumper P9 from the normal, (operate) position to the calibrate position. After performing a calibration, be sure to return the jumper back to its normal position.

  • Page 72: Repair Parts

    SERVICE INFORMATION REPAIR PARTS The Model 1750 has no user replaceable parts except for the accessories listed in Section 1 and the following items: Periodically check the fan filter to be sure that it is not obstructed by dirt. If so, clean or replace the filter.

  • Page 73: Troubleshooting

    • uses a special algorithm to eliminate noise created by line power. Verify that there are no sources of noise in close proximity to the 1750, test leads, power leads, • or test fixture. The 1750 performs measurement in the nanovolt range and sources of noise such as CRTs, relays, and other switching devices are primary causes for erratic readings.
  • Page 74 SERVICE INFORMATION Once you have verified that the cause for 1750 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. You can contact TEGAM customer service via the TEGAM website, www.tegam.com...

  • Page 75: Expedite Repair And Calibration Form

    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 • sales@tegam.com...

  • Page 76: Warranty

    TEGAM, Inc. warrants the calibration of this product for a period of 6 months from date of shipment. During this period, TEGAM, Inc. will recalibrate any product, which does not conform to the published accuracy specifications.

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