Manual - IET Labs, Inc.
Contents
1. data tables containing up to 256 equivalences also make it pos sible for the unit to simulate transducers such as thermistors and conductivity sensors For convenient PC connection the software kit includes a USB cable SERVICE AND SUPPORT IET LABS Inc offers full repair and calibration services at its corporate headquarters Do not attempt to repair or modify the ohmSOURCE Electronically Controlled Resistance Box as this will void the product warranty Any service required other than battery replacement or calibration must be referred to IET LABS Inc Please contact IET LABS Inc or visit www ietlabs com for further information Telephone 516 334 5959 FAX 516 334 5988 534 Main Street Westbury NY 11590 WARRANTY We warrant that this product is free from defects in material and workmanship and when properly used will perform in ac cordance with applicable IET specifications If within one year after original shipment it is found not to meet this standard it will be repaired or at the option of IET replaced at no charge when returned to IET Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifications shall void this warranty IET shall not be liable for any indirect special or consequential damages even if notice has been given to the possibility of such damages THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING B2. CALIBRATION An annual calibration is recommended in order to maintain results consistent with product specifications Perform a field calibration only when inaccurate values are suspected Please visit www ietlabs com for details Field Calibration Overview There are 30 resistance values that have to be entered during calibration To abort calibration at any time press MENU prior to entering the final residual resistance value None of the previously entered resistance values will be saved Required Tools Calibrated high precision digital multimeter DMM having a resistance accuracy greater than 4 times that of the ohmSOURCE The DMM must have 4 wire ohms measurement capability and a minimum 6 5 digit resolution Calibration Instructions 1 Connect the ohmSOURCE to the DMM using 4 wire measurement setup true ohm setting if available 2 Press MENU then press 3 to calibrate 3 Using the number keys enter the resistance value shown on the DMM Press enter to continue 4 Follow the DMM screen prompts for each calibration point When the message Calibration Saved is displayed calibra tion is complete 5 Verify performance of the ohmSOURCE against pub lished specifications by measuring resistance value across the range with DMM OPTIONAL ACCESSORIES OS 91 001 Software Development Kit For simulating RTD s this software kit lets users download up to three different data tables into the onmSOURCE These
3. UT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES Dangerous voltages may be present inside this instru ment Do not open the case Refer servicing to qualified personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES gt 45 V ARE USED TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT Use extreme caution when working with bare conductors or bus bars WHEN WORKING WITH HIGH VOLTAGES POST WARN ING SIGNS AND KEEP UNREQUIRED PERSONNEL SAFELY AWAY CAUTION h DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS INSTRUMENT IN EXCESS OF THE MAXIMUM LIMITS INDICATED ON THE FRONT PANEL OR THE OPERATING GUIDE LABEL PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT ohmSOURCE Electronically Controlled Resistance Box User and Service Manual GET onsen ELECTRONICALLY CONTROLLED RESISTANCE BOX RANGE 1 to 24 MO i Copyright 2012 IET Labs Inc Visit www ietlabs com for manual revision updates OS Series im May 2012 16 a IET IET LABS INC www ietlabs com 534 Main Street TEL 516 334 5959 FAX 516 334 5988 Westbury NY 11590 INTRODUCTION This handheld ohmSOURCE is an ef
4. elects the increments forthe To adjust increments rotary switch Press INCR Default value Ratiometric 0 8 2 Enter desired increment of displayed value value on the keypad Press ENTER to save Stores a resistance value in To store a value press STO and memory locations A D and 0 9 then press the desired location button A D or 0 9 To change stored values 1 Enter a resistance value Default values 2 Press STO and then A B A 10 kQ_ B 100 kQ C or D C 1MQ D 1 5 MQ Recalls a stored resistance To recall a stored value press value from memory location 0 9 RCL then press the desired location button 0 9 Limiting Current Sets voltage to limit the current To adjust voltage in order to protect the OS unit Press VOLT from possible damage Enter desired voltage on the Default value 0 5 V keypad Press ENTER to save Electrical Isolation Isolates the connection terminals To open the circuit press OPEN by establishing an open circuit To close press OPEN again Option Simulating RTD s and transducers Loads up to 3 stored data To select the desired table tables for simulating RTD s or press TABLE to cycle through transducers the three options ohmSOURCE UTED os 260 Rotary switch ELECTRONICALLY CONTROLLED RESISTANCE BOX RANGE 1 Q to 24 MQ a a y Note Rmin is limited to gt V where V is the VOLT set
5. fective option for field ap plications in all industries including automotive medical test and measurement and telecommunications This microprocessor controlled programmable resistance decade box provides highly accurate and stable resistance values It features a user friendly interface resistances of up to 24 MQ power of up to 1 W and two banana to alligator cables for convenient connection While remaining cost effective the ohmSOURCE still offers many ad vanced features to ensure that it is practical for both laboratory and field applications Quick value keys Recall up to four frequently used resistance values with one touch Memory keys Store resistance values in up to 10 additional memory loca tions 0 9 Current limit user defined Limits the amount of current passing through the ohm SOURCE to prevent possible damage Increment value setting Change resistance by user defined increments or select standard resistance values Open key Completely isolates the output terminals from each other Automatic residual resistance compensation The residual resistance of the ohmSOURCE is automati cally included in the output resistance value No zero resistance subtraction required Electrical isolation The ohmSOURCE circuit is completely isolated Auto off power To conserve power the ohmSOURCE automatically shuts off after 4 minutes of inactivity Field calibration Easily calibrate the ohmSOURCE with a h
6. igh precision ohmmeter Annual factory calibration is recommended Flash software updates To allow reprogramming of ohmSOURCE firmware the microprocessor has flash program memory Specifications Model OS 260 Model OS 270 0 to 24 000 000 0 Q 0 to 1 500 000 00 Q 1 000 0 Q 0 1 Q gt 1 000 0 Q 0 01 Accuracy lt 1 000 0 Q 0 5 Q gt 1 000 0 Q 0 1 Power Supply 4 AAA alkaline batteries 4 AAA alkaline batteries Minimum settable resistance determined at calibration is approximately 1 Q FEATURES amp KEY FUNCTIONS Basic operation enter Turns the OS unit on and off To turn on press ON OFF ON OFF and selects resistance value To turn off hold ON OFF for 3 seconds 0 9 000 Used to enter numerical values To select desired numerical value dial up as needed is used with OS 91 001 option only Deletes the last character from To delete the last character the display press lt Displays the following submenu Press MENU to select one of the STANDARD VALUES following 1 1 STD VALUES 1 STANDARD VALUES 2 5 STD VALUES selects increments for the 3 10 STD VALUES rotary switch 4 RATIOMETRIC CONFIGURE allows user CONFIGURE to adjust display contrast 1 LCD CONTRAST and enable disable Auto off 2 AUTO OFF ENABLE feature 3 AUTO OFF DISABLE CALIBRATE see calibra CALIBRATE tion section VERSION VERSION Displays cur rent firmware version and release date Options S
7. ting f A OPERATING INSTRUCTIONS 1 Connect the supplied test leads 2 Turnon the device on by pressing ON OFF 3 Select a desired resistance value in one of the following ways a Rotary switch b Enter a value using the number keys then press enter c Press a Quick Value key A D to display a user defined value or a factory default value Default values are A 10 KQ B 100 K2 C 1 MQ D 1 5 MO d Press RCL then a number key 0 9 to display a user defined value or a factory default value Default values are 0 100Q 1 1kQ 2 2kO 3 3kQ 4 4kQ etc 4 To prevent possible damage to the OS unit set the maximum applied voltage by pressing VOLT entering the voltage on the keypad then pressing enter Default 0 5 V The firmware sets the minimum selectable resistance value so that the power does not exceed 1 W To ensure that the whole range of resistances is selectable VOLT setting must be lt 1 V Rmin is limited to gt V where V is the VOLT setting 5 Connect to the circuit or device under test To isolate the ohmSOURCE from the application press OPEN to open the circuit To close the circuit press OPEN again To turn off the unit press and hold enter for 3 seconds The Auto Off feature turns the unit off after 4 minutes of inac tivity unless disabled by the user
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