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Burster RESISTOMAT 2408 Manual

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© 2011
burster
präzisionsmesstechnik gmbh & co kg
All rights reserved
Valid from: 18.02.2011
RESISTOMAT
Model 2408
Manufacturer:
burster präzisionsmesstechnik gmbh & co kg
Talstraße 1 - 5
76593 Gernsbach
Germany
Tel.:
(+49) 07224 / 6450
Fax.:
(+49) 07224 / 64588
E-Mail:
info@burster.com
www.burster.com
774-002408EN-5070-021513
®
P.O. Box 1432
76587 Gernsbach
Germany

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  • Page 1 RESISTOMAT ® Model 2408 © 2011 burster Manufacturer: burster präzisionsmesstechnik gmbh & co kg präzisionsmesstechnik gmbh & co kg All rights reserved Talstraße 1 - 5 P.O. Box 1432 76593 Gernsbach 76587 Gernsbach Germany Germany Valid from: 18.02.2011 Tel.: (+49) 07224 / 6450 Fax.:...
  • Page 2 (hereinafter referred to as “product”) are the results of targeted development and meticulous research. As of the date of delivery, burster provides a warranty for the proper condition and functioning of these products covering material and production defects for the period specified in the warranty document accompanying the product.
  • Page 3 K o n f o r m i t ä t s e r k l ä r u n g (nach EN ISO/IEC 17050-1:2010) Declaration of conformity (in accordance with EN ISO/IEC 17050-1:2010) Name des Ausstellers: burster präzisionsmesstechnik gmbh & co kg Issuer’s name: Anschrift des Ausstellers: Talstr. 1-5 Issuer’s address:...
  • Page 4 Model 2408 RESISTOMAT ® Page 4...
  • Page 5 Model 2408 RESISTOMAT ® WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instrument. Do not open the case refer servicing to qualified personnel. HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT.
  • Page 6 Model 2408 RESISTOMAT ® Page 6...

  • Page 7: Table Of Contents

    Model 2408 RESISTOMAT ® Contents Specifications ........................11 Accessories ........................13 Safety Precautions ......................15 Condensed Operating Instructions ................17 Section 1 - Introduction Unpacking and Inspection ..................23 Product Overview ....................23 Controls and Indicators ..................24 1.3.1 Front Panel Controls and Indicators ............24 1.3.2 Rear Panel Controls and Connectors ............26 Installation ......................27 1.4.1 Dimensions ....................27 1.4.2 Instrument Placement ..................27...
  • Page 8 Model 2408 RESISTOMAT ® Contents (Continued) Section 2 - Operation (Continued) 2.6.3 I/O Menu ......................47 2.6.3.1 Display Type ..................47 2.6.3.2 Result Format .................48 2.6.3.3 RS-232 ....................49 2.6.3.4 IEEE-488.2 ..................50 2.6.3.5 Handler ...................50 2.6.3.6 Saving Measurement Results via USB ...........50 2.6.4 Utilities Menu ....................52 2.6.4.1 Save Setup ..................53 2.6.4.2 Recall Setup ..................55 2.6.4.3 Zero ....................56...
  • Page 9 Model 2408 RESISTOMAT ® Contents (Continued) Section 4 - Theory General ........................81 Instrument Description ...................81 4.2.1 Basic Instrument Architecture ..............81 4.2.2 2408 Instrument Modules ................82 4.2.3 Instrument Options ..................83 Section 5 - Maintenance/Calibration Routine Maintenance ....................85 5.1.1 Battery Replacement ...................85 5.1.2 Resetting of Time and Date .................85 5.1.3 Loss of Display Contrast................86 5.1.4 Preventive Maintenance ................87...
  • Page 10 Model 2408 RESISTOMAT ® Page 10...

  • Page 11: Specifications

    Model 2408 RESISTOMAT ® Specifications Resistance Range: Ω(dependent on test voltage) 1 x10 to > 1x10 Ω at 1000Vdc 1x10 - >1x10 Ω at 100Vdc 1x10 - 1x10 Ω at 10Vdc 1x10 - 1x10 Ω at 1Vdc 1x10 - 1x10 (7 ranges or auto ranging) Resistance Accuracy:* ±[0.45% +{(Rx/Vx)(0.0005 FS + 2pA) + 30Ω/Rx}100%] Rx: Measured resistance in ohms...
  • Page 12 Model 2408 RESISTOMAT ® Specifications (Continued) Test Cycle: Manual: Charge, Measure, Discharge Automatic: Charge time: 0 -300 sec Dwell time: 0 - 300 sec Measure time: 0 - 999 sec Discharge time: 0 - 300 sec I/O Interface: Standard -RS232 I/O Port (w/safety interlock) Optional -2408-V001 IEEE-488.2, factory installed at unit...

  • Page 13: Accessories

    Model 2408 RESISTOMAT ® Accessories Page 13...
  • Page 14 Model 2408 RESISTOMAT ® Page 14...

  • Page 15: Safety Precautions

    Model 2408 RESISTOMAT ® Safety Precautions WARNING The 2408 Megohmmeter can supply an output voltage as high as 1000Vdc to the external device under test (DUT). Although the 2408 unit is designed with full attention to operator safety, serious hazards could occur if the instrument is used improperly and these safety instructions are not followed.
  • Page 16 Model 2408 RESISTOMAT ® Safety Symbols The product is marked with the following safety symbols. Product will be marked with this symbol (ISO#3864) when it is necessary for the user to refer to the instruction manual in order to prevent injury or equipment damage.

  • Page 17: Condensed Operating Instructions

    Model 2408 RESISTOMAT ® Condensed Operating Instructions WARNING High voltage is applied to the measurement terminals of the 2408 any time the CAUTION HIGH VOLTAGE LED is ON. While the current from the instrument is limited, the energy stored in a capacitive device connected to the terminals may be lethal. Always make sure the high voltage indicator is OFF when connecting or disconnecting the unknown. A flashing CAUTION HIGH VOLTAGE light and/or DANGER on the display indicates a defective unit with dangerously high voltages possible at the input terminals.
  • Page 18 Model 2408 RESISTOMAT ® Zeroing Before measuring, zero out test lead or fixture measurement errors as follows. 1. If test leads are to be used connect them to the 2408 input terminals, red to + unknown, black to - unknown, with probes open and spaced some distance apart (or fixture open). 2. Press [MENU] key to select menu display. 3.
  • Page 19 Model 2408 RESISTOMAT ® Manual Measurement Mode In manual measurement mode each phase of a test cycle, charge, measure and discharge is initiated manually at the users discretion. These test conditions can be DEFAULT (those at power up), set using menus or the operator can recall a previously stored setup. 1. Connect the device under test to the 2408 test leads or other fixture being used.
  • Page 20 Model 2408 RESISTOMAT ® Saving Setups 1. To save the current set of test conditions as entered (conditions include, voltage, test times, measurement range, limit, and display modes): Press [MENU] key to select menu display. Press Right or Left Arrow key to select Utilities menu. Press Up or Down Arrow key to select Save Setup.
  • Page 21 Model 2408 RESISTOMAT ® Setting Pass/Fail Limit 1. To enter a single measurement limit for resistance or current (depending on results display selected): Press [MENU] key to select menu display. Press Right or Left Arrow to select Setup menu. Press Up or Down Arrow key to select Limit in sub menu. Press [ENTER] key to activate the limit entry field.
  • Page 22 Model 2408 RESISTOMAT ® Page 22...

  • Page 23: Section 1: Introduction

    Inspect the 2408 instrument for any damage. If the instrument appears damaged or fails to meet specifications notify burster (refer to instruction manual front cover). Retain the shipping carton and packing materials for future use such as returning for recalibration or service.

  • Page 24: Controls And Indicators

    Model 2408 RESISTOMAT ® Controls and Indicators 1.3.1 Front Panel Controls and Indicators Figure 1-1 shows the controls and indicators on the front of the 2408 unit. Table 1-1 identi- fies them with description and function. 4 5 6 7 8 Figure 1-1: Front Panel Controls & Indicators Table 1-1: Front Panel Controls and Indicators Reference Number...
  • Page 25 Model 2408 RESISTOMAT ® Table 1-1: Front Panel Controls and Indicators (Continued) Reference Number Name Type Function Figure 1-1 Press to enter menu display mode or press MENU Green Push Button to exit sub menu & return to main menu. To exit menu mode with no parameter CNCL Gray Push Button...

  • Page 26: Rear Panel Controls And Connectors

    Model 2408 RESISTOMAT ® 1.3.2 Rear Panel Controls and Connectors Figure 1-2 illustrates the controls and connectors on the rear panel of the 2408 Megohm- meter. Table 1-2 identifies them with description and function. Figure 1-2: Rear Panel Controls and Connectors Table 1-2: Rear Panel Connectors and Controls Reference Number Name...

  • Page 27: Installation

    Model 2408 RESISTOMAT ® Installation 1.4.1 Dimensions The instrument is supplied in a bench configuration, i.e., in a cabinet with resilient feet for placement on a table. A bail is provided under the front edge so that the instrument can be tilted back for convenient operator viewing. 133.4mm Figure 1-3: 2408 Instrument Dimensions 1.4.2 Instrument Placement The 2408 instrument contains a high resolution back lit LCD for convenient viewing.
  • Page 28 Model 2408 RESISTOMAT ® PROCEDURE FOR CHANGING A FUSE WARNING Make sure the unit has been disconnected from its ac power source for at least five minutes before proceeding. Fuse drawer with release tab Figure 1-4: 2408 Instrument Fuse Drawer 1. Open the fuse drawer by inserting a small flat head screwdriver behind the small tab to pull the drawer outward. If you wish to remove the drawer from the ac inlet module (not required in order to change the fuse), press the sides inward at the rear of the drawer and pull the drawer out.

  • Page 29: Safety Inspection

    Model 2408 RESISTOMAT ® 1.4.4 Safety Inspection Before operating the instrument inspect the ac power inlet module on the rear of the 2408 instrument to ensure that the properly rated fuse is in place, otherwise damage to unit is possible. Refer to paragraph 1.4.3. The 2408 instrument is shipped with a standard German power cord with 3-wire plug and CE units are supplied with an approved international cord set.
  • Page 30 Model 2408 RESISTOMAT ® Page 30...

  • Page 31: Section 2: Operation

    Model 2408 RESISTOMAT ® Section 2: Operation 2.1 Terms and Conventions The names of keys in the manual will generally appear in CAPITAL LETTERS. The MENU key calls up the main menu display and returns to the line previously selected. The “>>” symbol on a menu indicates a lower level menu exists.

  • Page 32: Zeroing

    Model 2408 RESISTOMAT ® Power is applied to the 2408 by pressing the [POWER] button on the front panel. The instrument runs a self test and any error messages are displayed accordingly (refer to paragraph 2.8). Zeroing Before making measurements, the 2408 instrument should be zeroed to correct for test lead or fixture errors. During the zeroing process corrections are calculated and stored in instrument memory and applied to ongoing measurements.
  • Page 33 Model 2408 RESISTOMAT ® Figures 2-2 through 2-4 illustrate various methods of connection to the device under test (DUT). Figure 2-2 illustrates the two-wire connection to DUT. The two-wire ungrounded connection is the recommended connection of ungrounded components or components that can be connected very close to the 2408 input terminals rather than through the lead set provided.

  • Page 34: Measurement Procedure

    Model 2408 RESISTOMAT ® A three-wire guarded connection is necessary to measure resistance between two points in the presence of resistance from each of these points to a third point. Refer to paragraph 3.6 for a discussion of guarded measurements. The guarded measurement may require dif- ferent grounding techniques depending on the expected impedance of the DUT.

  • Page 35: Default Measurement Conditions

    Model 2408 RESISTOMAT ® In the manual mode, the test cycle timing is totally at the user’s discretion where each of the three phases (Charge, Measure, or Discharge) is initiated directly by the user. This mode would typically be used in an engineering environment or for component evaluation, where the measurement results can be observed as test cycle and measurement conditions are altered.

  • Page 36: Automatic Measurement Mode

    Model 2408 RESISTOMAT ® 2.5.3 Automatic Measurement Mode Measurements in the automatic mode can be initiated after connecting the DUT by simply pressing [START]. Test conditions are determined by either the power-up default condi- tions, or by recalling a previously stored setup from instrument memory. In either case, a test cycle is sequenced automatically (Figure 2-5) once [START] is pressed and results dis- played (Figure 2-6).
  • Page 37 Model 2408 RESISTOMAT ® ��������������������� ����������������� ����������������� ������������������������ ��������������������������� ���������� �������� ����������������� ��������������� ��������������������� ������� ������ ������������������� ��������������� �������������� ������� ����������������� ������������� ������ ������������ ��������������� ��������������������������� ���������������� ������������� ��������������������� ������ ����������� Figure 2-6: Measurement Results Display with Value ���������������������������������������� ��������������������������� ��������������...

  • Page 38: Manual Measurement Mode

    Model 2408 RESISTOMAT ® 2.5.4 Manual Measurement Mode The primary difference between automatic and manual modes is that in the manual mode the phases of the test cycle must be initiated manually by the user. Here there are three phases rather than the four in automatic; the Dwell function is part of the Charge phase. The results are still displayed in the manner indicated above;...

  • Page 39: Setup Menu

    Model 2408 RESISTOMAT ® 2.6.2 Setup Menus Setup Utilities Voltage 1000 Charge Time Dwell Time Measure Time Discharge Time Mode Auto Manual  Range >> Limit 100 e + 9 Stop on Pass # to Average Figure 2-9: Setup Menu The first of the three main menus is Setup, shown in Figure 2-9. Each function controls a measurement condition and is described in detail below.

  • Page 40: Charge Time

    Model 2408 RESISTOMAT ® 2.6.2.2 Charge Time Setup Utilities Voltage 1000 Charge Time Dwell Time Measure Time Discharge Time Mode Auto Manual Range >> Limit 100 e + 9 Stop on Pass # to Average Figure 2-11: Charge Time Entry Accepts entry of a charge time between 0 and 300 seconds in 1 second intervals (up to 3 digits).

  • Page 41: Discharge Time

    Model 2408 RESISTOMAT ® 2.6.2.5 Discharge Time Accepts entry of a discharge time between 0 and 300 seconds in 1 second intervals. This is the time when the test voltage is removed and the device under test discharged. The CAUTION HIGH VOLTAGE lamp goes OFF at the end of the programmed interval and the last measurement result is retained on the display (unless no display is selected).

  • Page 42: Range

    Model 2408 RESISTOMAT ® 2.6.2.7 Range Setup Utilities Auto µA µA µA Figure 2-13: Range Selection A lower-level menu (accessed by pressing [ENTER]) allows the selection of Auto or one of seven different measurement ranges (1 mA through 1 nA), which is the maximum cur- rent for the selected range.
  • Page 43 Model 2408 RESISTOMAT ® Table 2-1: Range Current Range Maximum Current 1 mA 100 µA 10 µA 1 µA 100 nA 10 nA 1 nA Example: When measuring an unknown of 200 MΩ at 100 V, Ohm’s Law tells us that the device under test would draw 0.5 µA (I = 100 V/200 MΩ). Based on the above, one would expect the 2408 instrument to auto-range from the 1 mA to 1 µA range (50% of maximum current), or that the user should select the 1µA range based on prior knowledge of the expected results.
  • Page 44 Model 2408 RESISTOMAT ® Measurement Ranges at Specified Voltage 1 kΩ 1 MΩ 1 GΩ 1 TΩ Resistance in Ohms Figure 2-14: Measurement Range Capability Page 44...

  • Page 45: Limit

    Model 2408 RESISTOMAT ® 2.6.2.8 Limit Setup Utilities Voltage 1000 Charge Time Dwell Time Measure Time Discharge Time Mode Auto Manual Range >> Limit 11 e + 006 Stop on Pass # to Average In the case where I (current) is selected rather than R (resistance), the exponent would be entered as a negative number.

  • Page 46: Stop On Pass

    Model 2408 RESISTOMAT ® 2.6.2.9 Stop on Pass Accepts entry of a value between 0 and 300 which is the number of consecutive pass- ing measurements that must occur to exit the measure loop before the measure time has passed. This is only active when there is a measure time and limit specified. An entry of 0 disables the stop on pass function.

  • Page 47: I/O Menu

    Model 2408 RESISTOMAT ® 2.6.3 I/O Menus Setup Utilities Display Type >> Result Format RS232 >> IEEE >> Handler Results to USB >>  Figure 2-16: I/O Menu The second of the three main menus is I/O, shown in Figure 2-16. Each function controls measurement results or instrument I/O interface, and is described in detail in paragraphs 2.6.3.1 through 2.6.3.6.

  • Page 48: Result Format

    Model 2408 RESISTOMAT ® In No Display, only the voltage, mode and range are displayed, with no measured value. This might be used for security reasons or for the purpose of reducing test time during re- mote operation. When the display is selected as current, you need to keep in mind that the 5 kΩ input impedance and the 1 kΩ...

  • Page 49: Rs-232

    Model 2408 RESISTOMAT ® A summary of measurement units (scientific and engineering) and their symbols is given in Table 2-2. Table 2-2: Measurement Unit Prefixes Multiple Scientific Engineering Symbol 1000000000000000 Peta 1000000000000 Tera 1000000000 Giga 1000000 Mega 1000 Kilo .001 milli .000001 micro µ .000000001 nano .000000000001 pico .000000000000001 femto 2.6.3.3 RS-232 Setup Utilities RS232 Baud...

  • Page 50: Ieee-488.2

    Model 2408 RESISTOMAT ® 2.6.3.4 IEEE-488.2 Setup Utilities IEEE488 Address Mode Talk Talk/Listen State Disable Enable Figure 2-20: IEEE-488.2 Interface Setup Allows user setup of IEEE-488.2 interface operation. Selections include: Address: 1 through 16 Mode: Talk or Talk/Listen State: Disable or Enable The instrument will function as either a Talk or a Talk/Listen device in a system depending on the choice made by the operator under Mode.
  • Page 51 Model 2408 RESISTOMAT ® When multiple tests are being conducted, the results are stored to the flash drive periodi- cally (every 10 measurements) from an internal buffer. CAUTION To store all results, close the file before shutting down the power. To keep measurement results consistent with the setup conditions, close the file before changing or recalling a new set of test conditions. The measurement results (one for each complete measurement cycle) are stored as a DOS text file under its assigned identifying number (up to 8 characters) with an extension of .65R. The test setup conditions are saved as a header at the beginning of a results file. A sample file format is shown below. Notice that the results can be stored in either engineer-...

  • Page 52: Utilities Menu

    Model 2408 RESISTOMAT ® 1.020 M ohm PASS 1.020 M ohm PASS 1.020 M ohm PASS 1.020 M ohm PASS 1.020 M ohm PASS 1.020 M ohm PASS 1.020015E+006 PASS 1.020015E+006 PASS 1.020015E+006 PASS 1.020015E+006 PASS 1.020015E+006 PASS 2.6.4 Utilities Menus Setup Utilities Display Type...

  • Page 53: Save Setup

    Model 2408 RESISTOMAT ® 2.6.4.1 Save Setup Setup Utilities Display Type Save DEFAULT 2408 - 1 2408 - 2 page 2408 - 3 down 2408 - 4 Figure 2-22: Save Setup Test Conditions Allows a set of test conditions to be stored in instrument memory or on the USB flash drive for later recall. Test conditions are those that are user programmable in the Setup and I/O menus (refer to paragraphs 2.6.2 and 2.6.3 above).
  • Page 54 Model 2408 RESISTOMAT ® Setup Utilities SAVE AS XXXXX? Figure 2-23: Save/Overwriting Setup To make the current set of test conditions the default (at power up) one needs to select [DEFAULT] in the Save Setup menu and overwrite the conditions currently stored. To pre- vent overwriting the default setup by mistake an additional level of safety exists where the operator is required to respond with Yes or No, similar to Figure 2-23.

  • Page 55: Recall Setup

    Model 2408 RESISTOMAT ® It is possible to store about 25 sets of test conditions in the 2408’s memory, and more than 1000 setups can be stored on a flash drive via the USB port. Increasing the quantity of se- tups results in a slower retrieval process. To save a set of test conditions externally, select [USB] from the menu in Figure 2-24. You can save a new setup or overwrite an existing one on the flash drive. Pressing [CNCL] re- turns the menu to the setups stored in internal memory, Figure 2-22. 2.6.4.2 Recall Setup Setup Utilities...

  • Page 56: Zero

    Model 2408 RESISTOMAT ® When there are more setups than can fit on the display the page down key is active. If there is less than a whole page below, the display wraps around to the previous display. Conti- nuing to page down will eventually return to the first display of setups. 2.6.4.3 Zero The zeroing process automatically measures stray parameters and retains the data. It is used to correct measurements, so that results represent parameters of the DUT alone without test lead or fixture capacitance. Zeroing is recommended at the start of each work day, or more often if leads, fixture, or test configuration to the DUT is changed. Zeroing should also be performed anytime the test voltage is changed, which also includes recal-...

  • Page 57: Lock Out

    Model 2408 RESISTOMAT ® 2.6.4.4 Lock Out Allows user to turn the keypad-lock feature ON or OFF. There are two choices which can be selected: lockout only and lockout with setup recall. In both modes only the [START], [STOP] and [MENU] on the instrument front panel are active, all other keys are disabled. The difference is that in lockout with setup recall, the menu key also allows setups to be recalled from instrument memory.

  • Page 58: Set Time/Date

    Model 2408 RESISTOMAT ® 2.6.4.6 Set Time/Date Tue Jan 14 10:37:10 2011 TO CHANGE TIME PRESS T KEY TO CHANGE DATE PRESS D KEY TO RETURN PRESS <MENU> Figure 2-28: Set Current Date and Time Allows resetting of time and date into unit memory. This is used as the basis for the elapsed time counter and stored calibration date.

  • Page 59: Elapsed Time

    Model 2408 RESISTOMAT ® 2.6.4.7 Elapsed Time When selected, indicates the total elapsed time in hours that the unit has been powered up. This is from the moment of initial use and will show some time when shipped from the factory.

  • Page 60: Set Contrast

    Model 2408 RESISTOMAT ® 2.6.4.9 Set Contrast Allows adjustment of contrast on the LCD display. Use Up arrow to increase contrast or Down arrow to decrease. When the instrument is powered up it returns to the last set con- trast, not some nominal level. HIT ARROW KEYS TO CHANGE THE DISPLAY CONTRAST HIT <ENTER>...
  • Page 61 Model 2408 RESISTOMAT ® Table 2-3: I/O Interface Connections Signal Name Pin Number Function Input* START Initiates Measurement Cycle Outputs** Bin 0 Fail, Measured Value below preset limit Bin 1 Pass, Measured Value above preset limit 11, 15, 33 System Ground IGND 5, 10, 23, 28 Isolated Ground...

  • Page 62: Ieee-488.2 Interface

    Model 2408 RESISTOMAT ® Table 2-3 NOTES * The input signal is active low and requires a positive-voltage external circuit, which must pull the signal line down below 0.4 V, but not less than 0.0 V, i.e. not negative. The logic-low current is 0.4 mA (max).
  • Page 63 Model 2408 RESISTOMAT ® Table 2-4: IEEE-488.2 Interface Connections Signal Name Pin Number Function DAV Low state: “Data is Available” and valid on DI01 through DI08 NRFD Low state: At least one listener on the bus is “Not ready for Data”. NDAC Low state: At least one listener on the bus is “Not Accepting Data”.
  • Page 64 Model 2408 RESISTOMAT ® Table 2-5: IEEE and RS-232 Commands Command Function Parameter(s) CONFigure: VALid? Is filename valid to save? xxxxxxxx SAVe: DUPLicate Save setup as duplicate filename in battery backed up RAM xxxxxxxx NEW Save setup as new filename in battery backed up RAM xxxxxxxx RECall filename Recall setup filename from battery xxxxxxxx backed up RAM FVALid? Is filename valid to save? xxxxxxxx FSAVe: DUPLicate Save setup as duplicate filename on USB xxxxxxxx...
  • Page 65 N.NNNNE+NNN (2 spaces) PASS. The plus (+) sign will be negative (-) when the parameter is selected as current. Pass can also be Fail or neither if no limit is entered. *IDN? Returns instrument identification “burster,2408,0,software version” START Initiates a measurement in Auto mode, in Manual mode it initiates charge, if sent again it takes one measurement, each time sent thereafter one additional measurement is taken.
  • Page 66 Model 2408 RESISTOMAT ® Table 2-5: IEEE and RS-232 Commands (Continued) Description of the 21 values returned by the remote “CAL: DATA?” The value of the internal voltage standard The 100 volt full scale value The 1000 volt full scale value The gain of the 500:1 voltage attenuator (.002) The gain of the 50:1 voltage attenuator (.02) The gain of the 5:1 voltage attenuator (.2) The input resistance The value of the range 1 standard (2 kW...
  • Page 67 Model 2408 RESISTOMAT ® Page 67...

  • Page 68: Sample Program For Io Tech Gpib Card

    Model 2408 RESISTOMAT ® 2.7.3 Sample Program for IO Tech GPIB card OPEN “\dev\ieeeout” FOR OUTPUT AS #1 IOCTL #1, “BREAK” PRINT #1, “RESET” OPEN “\dev\ieeein” FOR INPUT AS #2 PRINT #1, “fill error” PRINT #1, “remote 04” PRINT #1, “local lockout” id$ = space$(30) : c$=space$(15) PRINT #1, “output 04;idn?” PRINT #1, “enter 04” FOR i = 1 TO 3000: NEXT i INPUT #2, id$ PRINT “Company identification is “; id$ INPUT #2, id$ PRINT “Instrument identification is “; id$ INPUT #2, id$ PRINT “Serial number is “; id$...

  • Page 69: Rs232 Interface

    Model 2408 RESISTOMAT ® INPUT #2, y IF y THEN PRINT #1, “spoll 04” INPUT #2, x END IF WEND PRINT #1, “output 04;fetc?” ‘request data PRINT #1, “enter 04” ‘get data INPUT #2, c$ PRINT c$ PRINT #1, “output 04;system:lock 0” ‘enable front panel PRINT #1, “local” 2.7.4 RS232 Interface The 2408 instrument comes standard with an RS232 serial port interface, available through a connector (9 pin) on the rear panel of the instrument, for connecting to a PC.

  • Page 70: Sample Program For Rs232

    Model 2408 RESISTOMAT ® db9 to db9 Cable Configuration 2408 Controller Pin # Function Pin # Function Receive data Transmit data Transmit data Receive data Data terminal Connect Data set ready ready Signal ground Signal ground Data terminal ready Data set ready db9 to db25 Cable Configuration 2408 Controller...

  • Page 71: Results To Printer

    Model 2408 RESISTOMAT ® PRINT #2, “meas:res” FOR i = 1 TO 30000: NEXT i PRINT #2, „fetc?“ GOSUB cget s$ = INPUT$(x, #2) PRINT „res at 100 volts is „; s$; PRINT #2, „system:lock 0“ cget: ‚ subroutine to get serial input loop ‚ until first character is received DO WHILE (LOC(2) = 0) LOOP ‚ then get the rest of the string y = x + LOC(2) DO WHILE (x <>...

  • Page 72: Error Messages

    Model 2408 RESISTOMAT ® 2.8 Error Messages “BAD DRIVE-REQUEST STRUCTURE” Flash drive is either not connected or defective “BAD VOLTAGE SENT TO FUNCTION” Improper voltage entered during calibration procedure “BAD ZERO CALIBRATION” Zeroing error, repeat and/or remove component from input terminals/fixture (Refer to Note on p.63) “CALIBRATION STANDARD OUT OF Entered value > than 1% of 1 Megohm RANGE” “CORRUPT SETUP DATA” Stored setups lost or corrupt (battery for non-volatile memory may be defective or has been disconnected) “CRC ERROR ON USB” Stored setup lost or corrupt (cyclic- redundancy-check) “PROTECT ERROR” Flash drive is write protected “ELAPSED TIME ERROR, SET TO 0”...
  • Page 73 Model 2408 RESISTOMAT ® „USB SEEK ERROR“ Flash drive is either not connected or defective “USB WRITE FAULT” Flash drive is either not connected or defective “GENERAL FAILURE, USB” Flash drive is either not connected or defective “HANDLER PORT FAILURE” I/O port malfunction during power up “HARDWARE TIMER FAILURE, REBOOT” Hardware malfunction during power up “INVALID CALIBRATION CODE” Entered calibration code is invalid “INVALID LIMIT” Entered limit is invalid “INTERNAL HARDWARE FAILURE, Hardware malfunction during power up REBOOT” “LIMIT INVALID, SET TO NONE” No limit is accepted (out of range or invalid) “LOW BATTERY VOLTAGE” Memory backup battery, low voltage (setups and instrument zero could be lost) “MAXIMUM # OF SETUPS REACHED” Maximum number of files have been stored “NO CALIBRATION DATA FOUND” Calibration required (refer to Paragraph 5.4) “NO IEEE 488.2 INTERFACE” Unit does not include IEEE 488.2 Option “NO INTERLOCK SIGNAL” Open interlock connection at rear panel I/Port “NO PASSWORD ENTERED”...
  • Page 74 Model 2408 RESISTOMAT ® „PASSWORD NOT SAVED IN RAM“ Error trying to save password, repeat „PASSWORD VERIFICATION FAILURE“ Wrong password entry for verification „RANGE RESISTOR VALUE OUT OF RANGE“ Malfunction of internal calibration resistors „REMOTE COMMAND INVALID“ IEEE or RS232 command is incorrect (for example: to set voltage use VOLTage) „REMOTE COMMAND PARAMETER IEEE or RS232 parameter is incorrect (for INVALID“ example: voltage parameter can be XXXX.XXX) „REMOTE COMMAND PREFIX INVALID“ IEEE or RS232 command prefix is incorrect (for example: to configure unit use CONFigure) „SHUT THE POWER OFF“ Malfunction of high voltage source „TIME / DATE ERROR, PLEASE SET“ Reset time and date “UNABLE TO READ FROM USB” Flash drive is either not connected or defective “UNABLE TO READ THAT FILENAME” Selected file unreadable, improper format “UNABLE TO SAVE CALIBRATION DATA” Repeat calibration, data not stored “UNABLE TO WRITE TO USB” Flash drive is either not connected or defective “UNABLE TO WRITE TO REMOTE”...

  • Page 75: Section 3: Applications

    Model 2408 RESISTOMAT ® Section 3: Applications 3.1 Insulation Resistance Testing Insulation resistance of materials is one of several parameters that may indicate the condition of insulation. An insulation test is to measure the resistance offered by the insulating members of a component part to an impressed direct voltage tending to produce a leakage of current through or on the surface of these members.

  • Page 76: Test Sample Resistivity Measurements

    Model 2408 RESISTOMAT ® 3.2 Test Sample Resistivity Measurements The 2408 can be used for measuring the resistivity of test samples as described by ASTM Standard D 257, which describes in detail the techniques for both surface and volume resistivity measurements. The 2408-Z006 Test Cell is shown in Figure 3-1 Figure 3-1: 2408-Z006 Surface/Volume Plate Test Sample Cell Page 76...

  • Page 77: Capacitor Insulation Resistance

    Model 2408 RESISTOMAT ® The electrode consists of an electrode body, a guard ring, a guard ring cap and a base plate. Depending on the way the connections between electrode and 2408 are made it is possible to measure volume resistance or surface resistance. The measuring electrode type 2408-Z006 has a diameter of 50mm (20 cm²) and a protective gap of 5mm.

  • Page 78: Charge Time Constant

    Model 2408 RESISTOMAT ® 3.3.2 Charge Time Constant The time constant for charging a capacitor in the charge phase is determined by the value of the capacitor times the effective source impedance of the supply. The supply resistance is approximately, = ----- Ω...

  • Page 79: Resistance Measurements

    Model 2408 RESISTOMAT ® 3.4 Resistance Measurements The recommended test voltage is typically 100 V for fixed composition resistors, film resistors or wire wound resistors above 100 kΩ. Refer to the component manufacturers’ recommended test voltages. These resistors (values greater than 1000 Ω) can easily be measured on the 2408 where the instrument basic accuracy of 0.5% is adequate.

  • Page 80: Guarded, 3 Terminal Measurements

    Model 2408 RESISTOMAT ® 3.6 Guarded, 3-Terminal Measurements In many cases it is necessary to measure the resistance between two points in the presence of resistance from each of these points to a third point. This third point can often be guarded to avoid error caused by the extraneous resistance.

  • Page 81: Section 4: Theory

    Model 2408 RESISTOMAT ® Section 4: Theory General The 2408 Megohmmeter consists of a standard mechanical package, LCD display/keypad, microprocessor unit, digital I/O interface and power supply. It incorporates circuitry unique to the 2408, an analog instrument module, and a power supply. In addition, there is an IEEE.488.2 option, discussed briefly below.

  • Page 82: 2408 Instrument Modules

    Model 2408 RESISTOMAT ® LCD Display/Keypad Panel The front panel user interface consists of a molded silicon rubber keypad that actuates a membrane switch assembly. The keypad is environmentally sealed, designed for long life, and all keys provide tactile feedback to the operator. The 2 1/2” x 4 3/4” LCD is a high- resolution graphic display with on/off backlight for visual clarity. Both keypad and display are connected to the instrument I/O board via ribbon cables.

  • Page 83: Instrument Options

    Model 2408 RESISTOMAT ® Power Supply Assembly The 2408 Power Supply Assembly consists of two modular, switching power supplies. The first has a +24, +5, and -12 Vdc output. It supplies the Instrument Board. The second has +5 and ±15 Vdc outputs, and powers the I/O and Processor boards. 4.2.3 Instrument Options IEEE-488.2 Board & Cable The IEEE-488.2 board is offered as an option to the 2408 and allows complete control over all aspects of the instrument.
  • Page 84 Model 2408 RESISTOMAT ® Page 84...

  • Page 85: Routine Maintenance

    Model 2408 RESISTOMAT ® Section 5: Service & Calibration Routine Maintenance Routine maintenance of the 2408 instrument includes battery replacement, time & date resetting, display contrast monitoring, preventative cleaning and calibration. 5.1.1 Battery Replacement CAUTION To avoid damaging the unit, replace the batteries annually. Backup power for the instrument’s non-volatile memory is supplied by 3 standard AA bat- teries.
  • Page 86 Model 2408 RESISTOMAT ® Battery Compartment Figure 5-1: Battery Compartment 5.1.2 Resetting of Time and Date If for some reason the backup power supplied by the 3 AA batteries should fail during shipment of the instrument (due to shock, vibration or extreme temperature) the unit will lose its zero, time and date, elapsed time and stored setup conditions.

  • Page 87: Loss Of Display Contrast

    Model 2408 RESISTOMAT ® 5.1.3 Loss of Display Contrast If for some reason the instrument should loose its display contrast it is possible to reset it easily using the procedure below. Loss of contrast would exhibit no display at all when the instrument is powered up.

  • Page 88: Calibration

    General Calibration of the 2408 Megohmmeter should be verified for performance at a calibration interval of twelve (12) months. This procedure may be carried out by the user, if a calibration capability is available, by burster, or by a certified calibration laboratory. If the user should choose to perform this procedure, then the considerations below should be observed. Requirements for Recalibration Temperature-stabilized room at 23 degrees C (73.4 F) Precision Digital Voltmeter (0.01% accuracy) with calibration traceable...
  • Page 89 Model 2408 RESISTOMAT ® If the selection is N (no), measure the reference voltage as instructed between TP6 and TP8 (ground) on the analog instrument board and enter the measured value. To access these points it is necessary to remove the top cover, refer to Figure 5-1. Once this voltage value is entered and [ENTER] pressed the High Voltage (100V) will be turned on immediately.
  • Page 90 Model 2408 RESISTOMAT ® Page 90...

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