Burster 24508 Operation Manual
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Burster 24508 Operation Manual

Megohmmeter
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Megohmmeter
© 2020
burster
präzisionsmesstechnik gmbh & co kg
All rights reserved
Valid from: 2020-07-06
OPERATION MANUAL
Megohmmeter
Model 24508
Manufacturer:
burster praezisionsmesstechnik gmbh & co kg
Talstraße 1 - 5
76593 Gernsbach
Germany
Tel.:
(049) 07224 / 6450
Fax.:
(049) 07224 / 64588
E-Mail:
info@burster.com
www.burster.com
3045-024508EN-5999-071527
Model 24508
P.O.Box 1432
76587 Gernsbach
Germany
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  • Page 1 Megohmmeter Model 24508 OPERATION MANUAL Megohmmeter Model 24508 Manufacturer: © 2020 burster burster praezisionsmesstechnik gmbh & co kg präzisionsmesstechnik gmbh & co kg Talstraße 1 - 5 P.O.Box 1432 All rights reserved 76593 Gernsbach 76587 Gernsbach Germany Germany Tel.: (049) 07224 / 6450 Valid from: 2020-07-06 Fax.:...
  • Page 2 Components, devices and measured value sensors made by burster praezisionsmesstechnik (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 Megohmmeter Model 24508 Page 3...
  • Page 4 Megohmmeter Model 24508 Page 4...

  • Page 5: Table Of Contents

    5.2 Pin connections for the RS232 interface ..........27 5.3 Command code for the RS232 interface ..........28 5.3.1 Transit commands to the megohmmeter type 24508 via RS232 ........28 5.3.2 Response from type 24508 ........... 29 5.4 Programming example ................. 30 5.5 Execute of the test program ..............
  • Page 6 Megohmmeter Model 24508 Page 6...
  • Page 7 Megohmmeter Model 24508 This equipment complies with the following product specifications Safety: CEI 1010-1 / EN 61010-1 Class I protection Operating voltage: 230 V cat. II EMC: Electromagnetic compatibility Interference emission: EN 55011 Group 1 Class Interference immunity: EN 50082-1 CEI 1000-4-2 Level 3; CEI 1000-4-3 Level 2...
  • Page 8 Megohmmeter Model 24508 Page 8...

  • Page 9: Safety Instructions

    Megohmmeter Model 24508 Safety requirements and operating instructions For reasons of safety, this equipment must only be used by suitably qualified and trained personnel who are aware of the potential hazards. Read this manual through thoroughly before using the equipment. With regard to the potential hazards associated with using any electric circuit, it is important that the user is completely familiar with the information concerning the possible capabilities and applications of this equipment and how it works.
  • Page 10 Megohmmeter Model 24508 Never use or operate electrical equipment if either the equipment or you are wet, not even if just your hands or feet are wet. In the event of faults, switch off the voltage immediately and pull out the plug.

  • Page 11: General Information

    The megohmmeter is suitable for both laboratory and industrial use. 1.2 Description The digital megohmmeter type 24508 is a microprocessor-controlled instru- ment for measuring insulation resistances. The unit has a clear layout and is housed in a rugged metal case. The individual components are easily acces- sible, providing ideal servicing conditions.

  • Page 12: Block Diagram

    Megohmmeter Model 24508 1.3 Block diagram Page 12...

  • Page 13: Preparations For Use

    The packaging should be retained for examination by a representative of the manufacturer and/or the delivery company. The megohmmeter type 24508 should be shipped only in its original packaging or in packaging capable of providing an equivalent degree of protection.

  • Page 14: Mains Fuse

    Megohmmeter Model 24508 2.4 Mains fuse The mains fuse is located blow the mains socket on the rear of the unit. Make sure that the unit is fully disconnected from the electrical mains before changing the fuse. (Remove the power lead from the grounding outlet).
  • Page 15 Megohmmeter Model 24508 Rear panel of unit Page 15...

  • Page 16: Functional Test

    Megohmmeter Model 24508 2.6 Functional test After switching on the unit, the following text appears successively on the display: burster 24508 µA / Megohmmeter ⇓ burster 24508 Version B xxxxxxx ⇓ RESISTANCE CURRENT 2.7 Calibration The equipment was calibrated before shipping.

  • Page 17: Controls And Connections

    Megohmmeter Model 24508 3. Controls and connections 3.1 Button functions Page 17...

  • Page 18: Description Of Connectors

    Megohmmeter Model 24508 3.2 Description of connectors Test voltage Red BNC socket - Plastic insulation - Ground (protective ground) - Voltage output Measurement input Black BNC socket - Plastic insulation - Guard (functional ground) - Measurement input Guard connector Blue ø 4 mm safety socket for ø...

  • Page 19: Manual Operation

    Megohmmeter Model 24508 4. Manual operation 4.1 General instructions Before operating the 24508 and connecting any electrical leads, first study the „Safety requirements and operating instructions“ chapter. Procedure - Place the unit on a stable work surface, and observe the directions on proper ventilation. - Connect the unit to a mains outlet fitted with an equipment grounding con- tact, and power up the unit by pressing the mains switch [1]. The illuminated display indicates that the unit is running. If the display does not come on, check the electrical connection to the mains and the fuse if necessary (See „Maintenance and warranty“...

  • Page 20: Setting The Measurement Time

    Megohmmeter Model 24508 4.2 Setting the measurement time A time of up to 999 s (> 16 min.) can be preset in the „Time of Measure“ menu. Once the measurement time has elapsed, the unit goes automatically into the stop state, and the value last measured is saved in the display.

  • Page 21: Error Messages

    Megohmmeter Model 24508 4.5 Error messages In the event of measurements falling outside the measuring range, various error messages appear on the display as follows: LOWER-RANGE, if the reading from the object under test is less than the set measuring range (for manual range selection).
  • Page 22 Megohmmeter Model 24508 - To change the test voltage, select the U TEST menu, select the test voltage required and confirm with button [2]. Then select the MEASURE menu and confirm. - The test parameters such as test voltage and measuring range are now displayed in the top line. MEASURE: xxxV Bx 4. - Press button [2] to start the measurement. The “TEST V” indicator lamp...

  • Page 23: Overview Of Operation

    Megohmmeter Model 24508 4.7 Overview of operation After switching on the unit, it jumps directly to the test mode last selected. If the RS232 data transfer lead is connected, the unit jumps directly into SLAVE MODE. Page 23...
  • Page 24 Megohmmeter Model 24508 CURRENT MEASUREMENT Page 24...
  • Page 25 Megohmmeter Model 24508 RS232 INTERFACE Page 25...
  • Page 26 Megohmmeter Model 24508 RESISTANCE MEA- SUREMENT Page 26...

  • Page 27: Remote Control

    Megohmmeter Model 24508 5. REMOTE CONTROL 5.1 Controlling the unit remotely The megohmmeter type 24508 is fitted as standard with an RS232-C interface. The interface is configured via the "INTERFACE MENU". When being controlled via the RS232, the unit must be in the RS232 menu "SLAVE MODE" and the special RS232 cable must be connected. After power on you must first choose menu"RS232 INTERFACE" and confirm with the ENTER key below the display. The device is now in the "SLAVE MODE". As long as the connection pin 4 / 9 exists the device knows- also after power off- that the SLAVE MODE was chosen. After the disconnection of the RS232 cable the device goes back in the standard mode. After the "SLAVE MODE"...

  • Page 28: Command Code For The Rs232 Interface

    Megohmmeter Model 24508 5.3 Command code for the RS232 interface 5.3.1 Transmit commands to the megohmmeter type 24508 via RS232 Threshold setting: Sxxxx,yy; xxxx 16-bit instruction (0-65000) Delimiter between value and exponent 8-bit exponent (±127) Delimiter between parameters (or CR if...

  • Page 29: Response From Type 24508

    = Receive error or incorrect command code sent End-of-message symbol - Start measurement - if the code contains errors, wait for new command string Type 24508, transfer of measured value at end of measurement time: Second transmission xx,yyyyyEzzzCR xx 8-bit flag (Hex code) 00 = Measured value <...

  • Page 30: Programming Example

    RXD (2) ‘ —— Hardware-Handshake: am PC: DTR(4) mit DSR(6) und CTS(8) verbinden ‘ —— Bruecke Pin 4 mit Pin 9 am Typ 24508 zur Fernsteuer-Kennung ‘ —— Die beim PRINT # Befehl Q-Basic-spezifischen automatisch ‘ —— mitgesendeten Ende-Zeichen CR = CHR$(13), ‘ —— werden durch das Zeichen „;“, am Ende des Befehls, unterdrueckt.
  • Page 31 Megohmmeter Model 24508 ‘Threshold = Sxxxx,yy; (Grenzwert) ‘ xxxx = Instruction Grenzwert ‘ = Separator zwischen Wert und Exponent ‘ yy = Exponent ‘ = Parameter separator oder CHR$(13) = CR Grenzwert$ = „S10,09;“: ‘Default Grenzwert 10E09 = 10 Gigaohm + ;sepa- rator ‘Achtung: Grenzwertfunktionen sind nur in den Widerstandsbereichen ak-...
  • Page 32 ‘************ Typ 24508 Antwort (Fehlerflag) einholen und anzeigen GOSUB einlesen: ‘CHR$(00) or CHR$(128) und CHR$(13) einlesen ’ 00H=(CHR$(00)) und 0DH=(CHR$(13)) ‘ PRINT „ Typ 24508 Befehls-Antwort$ =“ + Lesen$ + CHR$(10): ‘CHR$(13)+CHR$(10) ‘ CR Flag1$ = „00“: ‘ Flag loeschen Flag1$ = MID$(Lesen$, 1, 1): PRINT : PRINT „ Flag_1 = Fehlerflag = „; CHR$(ASC(Flag1$)); : ‘Hex Ziffer in ASCII umsetzen...
  • Page 33 ‘Warten auf Messwert und Einlesen des Messwertes PRINT ‘Neue Zeile PRINT „ Typ 24508 Daten$ = „ + Lesen$; ‘Wenn Timeout programmiert dann minimale Messzeit warten ‘Antwort$ = Lesen$ = xx,yyyyy,Ezzz + CHR$(13) ‘xx = 8 Bit Flag in Hex ‘...
  • Page 34 CASE CHR$(48) ‘Hex 30 Binaer 0011 0000B PRINT „***************************************************************“ END SELECT: PRINT „ Message Typ 24508 = „; Lesen$: ‘*************** ;Messwert aufbereiten ******************** messwert$ = MID$(Lesen$, 3, 5): exponent$ = MID$(Lesen$, 9, 3): exponent = VAL(exponent$) IF exponent > 128 THEN exponent = (exponent - 128) * (-1): ‘negativer Exponent...

  • Page 35: Execute Of The Test Program

    The Terminal Test Programm 24508_06.exe is a simple and easy to handle test program. It is gives no additional help function. All functions of the Megohm- meter model 24508 can check with this program. The down load is free of charge at www.burster.de Download Area...
  • Page 36 Megohmmeter Model 24508 Additional information at the limit evaluation via the RS232 Interface Megohmmeters have very sensitive measurement inputs which can be disturb during a measurement. Depending the measurement range and the internal filter you get an engage of the display. This is the reason of the different analy- sis result. 1. When the measurement value engage the first displayed value is used for the analysis of the limit flag. 2. The second and further values are transferred via the RS232 Interface.

  • Page 37: Maintenance And Customer Service

    6. Maintenance and Customer ser- vice 6.1 Maintenance The megohmmeter type 24508 requires no maintenance by the user. It merely needs protecting from dust and moisture. Any repairs that may be needed must be performed only at the manufacturer’s premises.

  • Page 38: Factory Warranty

    Model 24508 6.3 Manuafacturer's guarantee Maintenance and customer service burster garantees reliable operation of the device for a period of 24 months followings its delivery. Repairs required within this period will be performed free-of-charge. This guarantee does not cover damage arising from improper handling of the device.

  • Page 39: Technical Data

    Megohmmeter Model 24508 7. Technical data Only values with tolerances or limits can be taken as guaranteed. Values without toler- ances serve purly as orientation and are not binding. 7. Technical data This device is easy to maintain and has a robust metal housing. The individual modules can be accessed and serviced with the greatest of ease.
  • Page 40 Megohmmeter Model 24508 Operation temperature: 0 °C ... 45 °C Storage temperature: - 20 °C ... + 70 °C Operation voltage: 230 V ± 10 % 50 Hz Device safety: According EN 61010-1 Power consumption: < 10 VA Housing ( W x H x D): 255 x 125 x 270 [mm]...

  • Page 41: Appendix

    Megohmmeter Model 24508 APPENDIX General information on the meg- ohmmeter Basically a megohmmeter consists of a precision voltage source connected in series with a measuring circuit that enables measurement of the current flowing through an object under test. The value of this current can be very small (less than a few nA); this...
  • Page 42 EXAMPLE 2 Depending upon the connection wiring the RESIS- TOMAT 24508 makes it possible to determinate the ® surface or the volume resistance. For the determination of the surface resistance fol- lowing connection is necessary: Measure electrode  with "x" input Guardring  with "U" input...

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