Biddle DLRO200_UG 电路图.pdf

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1、M DLRO 200 High Current, Low Resistance Ohmmeter USER MANUAL DLRO200_UG_En_V01 22/04/2004 4:26 pm Page 1 RadioFans.CN 收音机爱 好者资料库 GSAFETY WARNINGS THESE SAFETY WARNINGS MUST BE READ AND UNDERSTOOD BEFORE THE INSTRUMENT IS USED. IDLRO200 is supplied without a plug terminating the supply lead. An appro

2、priate plug must be fitted prior to use. IThe DLRO200 must be grounded (earthed) when in use. If the ground / earth in the socket outlet being used to energise the DLRO200 cannot be relied upon, the instrument must be connected to a reliable earth / ground via the large green and yellow terminal on

3、the left hand side of the instrument. If no ground / earth is present the instrument will refuse to start a test. ICircuits must be de-energised before testing. The DLRO200 must only be used on dead systems. If the item under test has a voltage upon it greater than 10 volts ac peak or dc with refere

4、nce to ground the DLRO200 will indicate the presence of the voltage and prevent any tests being carried out. ITesting inductive circuits can be hazardous: The DLRO200 is a high power instrument, designed for testing resistive loads. It must NOT be used to test inductive loads. IDuring use the DLRO20

5、0, its current leads and the sample being tested can become hot. This is normal and is caused by the passage of high currents. Take care when touching the instrument, current leads, clips and the test sample. IThis product is not intrinsically safe. Do not use in an explosive atmosphere. IEnsure tha

6、t the power switch is always accessible so that power can be disconnected in an emergency. IIf this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. 2 DLRO200_UG_En_V01 22/04/2004 4:26 pm Page 2 RadioFans.CN 收音机爱 好者资料库 SYMBOLS

7、 USED IN THIS DOCUMENT AND ON THE INSTRUMENT uProtective Conductor Terminal sHot Terminals GRefer to the User Manual for more information 1Power On 0Power Off cEquipment complies with relevant EU Directives CONTENTS 3 SAFETY WARNINGS2 GENERAL DESCRIPTION4 OPERATION5 Main Menu Screen5 TEST Menu6 OPTI

8、ONS Menu7 CURRENT Menu9 Warning Messages9 Entering Notes In The Memo Screen9 Test Result Storage10 Real Time downloading of test data.10 TEST TECHNIQUES TEST, OPTIONS and “CURRENT. Below this are details of the test current selected (SET CURRENT), maximum current to be allowed (CURRENT LIMIT), the n

9、umber of stored tests and the current date and time. To perform a measurement is straightforward. 1. Use the Left and Right arrows of the two-axis cursor control to highlight the TEST menu. Use the down arrow to select the required test type. Press Enter. 2. Use the Left and Right arrows of the two-

10、axis cursor control to highlight the CURRENT menu. Use the down arrow to select SET and press Enter. Type in the desired current using the numeric keys on the keypad. When finished press Enter. If the current you have set is greater than the current limit, DLRO200 will beep and clear the SET CURRENT

11、 field. Re-enter the desired current, if necessary increasing the current limit to a value equal to or greater than the desired level. (See separate topic for setting the current limit). 3. Connect the sample to be tested to the instrument terminals and press the TEST button. The different test type

12、s have slightly different connection requirements, which are detailed, in the sections below. Please note that if your DLRO200 is inadequately grounded / earthed it OPERATION 5 Terminate the supply lead with a plug suitable for your circumstances. Plug the instrument supply lead into a socket outlet

13、 and switch the instrument on using the On/Off switch situated on the left side of the instrument. The POWER lamp will illuminate, the instrument will display the firmware version number and perform a calibration check. If this is successful the display will show CALIBRATED. If the check fails the d

14、isplay will show NOT CALIBRATED”. After a slight pause the display will change to the Main Menu screen. DLRO 200 V1.00 COPYRIGHT MEGGER LIMITED 2002 INITIALISING HARDWARE CALIBRATED TEST OPTIONS CURRENT SET CURRENT150 CURRENT LIMIT 200 23 TESTS STORED 21/03/02 15:13 200 200 DLRO200_UG_En_V01 22/04/2

15、004 4:26 pm Page 5 6 OPERATION will not be possible to start a test. TEST Menu The TEST menu allows the selection of one of three test modes - Normal, Automatic or Continuous. Only one mode can be active at a time and the active mode is displayed below the heading TEST when you return to the MAIN ME

16、NU screen. Normal Mode Normal mode makes a single measurement of the resistance of the sample under test. Please note that in this mode both the current and voltage leads must be connected across the test sample before the Test button is pressed. When the TEST button is pressed DLRO200 will check fo

17、r good contact in the P circuit. If the P circuit continuity is faulty the display will show POTENTIAL FAIL. Press the ENTER key to remove this message and adjust the contact of the P probes to ensure good contact is achieved. Press the TEST button again. P circuit continuity will be checked and if

18、satisfactory DLRO200 will proceed to carry out a test. After a short period of time, if there is inadequate contact in the C circuit the instrument will display CURRENT LOOP FAIL. Press Enter to remove this message, make good the connection and press the TEST button to start the test. A sequence of

19、bars will appear across the display while the test is being completed. To make another measurement, ensure the test leads are connected and press the Test button. NORMAL mode is abbreviated to NORM under the TEST heading in the main menu screen. Continuous Mode Continuous mode requires the current l

20、eads and the voltage leads to be securely connected to the item under test before pressing the Test button. The DLRO200 checks voltage and current loop continuity as in Normal Mode and, if adequate, passes a continuous d.c. current, repeating resistance measurements at approximately 2-second interva

21、ls until the test is terminated by pressing the Test button (or until the DLRO200 overheats if particularly high currents are used). CONTINUOUS mode is abbreviated to CONT under the TEST heading in the main menu screen. Overheating When operating continuously at 200 A, overheating will occur after a

22、pproximately 15 minutes (assuming a starting temperature of 20C). A message HOT will then appear on the display until the internal parts have cooled. When the HOT message is on the screen, test current is turned off and all front panel controls are disabled. Operating at reduced current will conside

23、rably extend the operating time. Automatic Mode In Automatic mode, only connect the current leads to the sample to be measured. Press the TEST button. The red status lamp next to the TEST button will flash signifying that DLRO200 is armed and will remain in a state of readiness until the P circuit i

24、s completed. At this time the light will illuminate continuously and the test will be carried out. The progress of the test is shown by a series of bars progressing across the display. To make another measurement it is necessary to break P probe contact with the test sample and remake contact. For e

25、xample, if measuring joints in a long bus bar, you may leave the current circuit connected at opposite ends of the bus bar knowing that current will only flow during a measurement i.e. when the P probes are connected. Simply making contact with voltage probes across the joint(s) DLRO200_UG_En_V01 22

26、/04/2004 4:26 pm Page 6 OPERATION 7 package please note the settings should be 9600 baud, 8 data bits, 1 stop bit, and no parity. Downloading data does not cause the stored data to be erased from memory. To clear data from memory see Delete Data below. Please note DLRO200 also makes data available v

27、ia the RS232 Port in real time and is suitable for printing on a self-powered serial printer. (See later for details.) The output has the following form: Test Type Test Number Date Format Date Time Selected Current Resistance Measured Current Measured Voltage Upper Limit * Lower Limit * Pass Or Fail

28、 * * The last three lines will only appear if passbands have been set. you wish to measure will then activate the measurement. AUTOMATIC mode is abbreviated to AUTO under the TEST heading in the main menu screen. AUTO mode may be exited by pressing the TEST button while the status light is flashing.

29、 OPTIONS Menu The Options menu has five selections, which control various ancillary functions and which are selected using the two-axis cursor control and the Enter key. These are Retrieve, Passbands, Set Clock, Delete Data and Storage. Retrieve allows the recall of results which have been stored wi

30、thin the DLRO200s internal memory. There are two choices, Display or Download. Display recalls each test, in sequence, to the instrument display starting with the most recently stored result. Use the cursor control Up and Down controls to step later or earlier respectively through the stored results

31、. If you know the number of the test that you wish to display simply type in the number and press Enter. An asterisk (*) next to the word MEMO at the bottom of the screen means that there are notes attached to this result. Press the right cursor control to view the notes. Download causes the entire

32、contents of the data store to be output to the RS232 port above the display. A null modem RS232 lead is supplied with the instrument. Any communications package may be used to download the data although a copy of Download Manager, which facilitates downloading and formats the data, is also supplied.

33、 If using another DLRO200_UG_En_V01 22/04/2004 4:26 pm Page 7 OPERATION 8 When you enter this screen the current date, time and date format will be displayed. Use the cursor control Up and Down arrows to adjust the highlighted data. Step to the next item by using the Right cursor control arrow. The

34、row below DD MM YY HH MM contains respectively the date, the month, the two-digit year (21st century is assumed), the hour of the day in 24-hour notation and the minute. These must be entered in this sequence regardless of the date format you wish to use. The lower DD/MM/YY shows the current date fo

35、rmat. Pressing the cursor control Up arrow will cycle through the available options DD/MM/YY, MM/DD/YY or YY/MM/DD. This is updated when you press Enter to exit the Set Clock function. However, tests already stored prior to changing the date format will retain the old format. Delete Data Select Dele

36、te Data if you wish to clear DLRO200s memory of stored data. In case you have selected this Option by accident you will be asked to confirm that you wish to delete the data. The default is NO. Change this to YES and press Enter if you wish to delete all data. Please note - ALL stored data will be de

37、leted. Storage The Storage option sets the instrument to Store or No Store. At the end of each test you will be offered the opportunity to change this setting for the test just completed and subsequent tests. At the end of each test you may enter notes into the MEMO screen, which is accessed by pres

38、sing any key on the alphanumeric keyboard. This will also cause the test to be automatically stored regardless of other settings. Passbands The passband option allows you to set upper and lower limits between which the test result must lie if it is to be assigned a Pass. Readings that fall above the

39、 upper limit or below the lower limit will be assigned a Fail. The upper and lower limits are entered via the keyboard complete with decimal points, where applicable, and including the m or symbol as appropriate. It is not necessary to enter the symbol. Entering the m or symbol tells DLRO200 that th

40、e entry in that particular field is complete and the cursor will therefore move to the next field. The upper limit must be less than or equal to 999.9 m and the lower limit must be less than the upper limit. After completing the upper and lower limits the cursor will move to the ENABLE or DISABLE op

41、tions. Highlight your choice using the right and left controls and press Enter. You will return to the Main Menu screen. Note: Passbands will remain enabled or disabled until you re-enter this screen and change the selection. If all that is required is to change Passbands from ENABLED to DISABLE or

42、vice versa, enter the PASSBAND screen and press Enter until the ENABLED / DISABLED choice is shown at which time you may change the selection. Pressing Enter will skip over the limit values without changing them if none of the numeric keys has been pressed. If passbands have been set and enabled, at

43、 the end of a test the display will show the results and will show the word PASS or FAIL as appropriate. A PASS will also be signified by a short beep from the instrument, while a FAIL will be signified by a long beep. Set Clock This option sets the date and time as well as setting the date format.

44、DLRO200_UG_En_V01 22/04/2004 4:26 pm Page 8 OPERATION 9 If all memory has been filled, a message MEMORY FULL will appear and no more tests results will be stored although testing may continue without storing results. The main menu screen will also display 300 MEMORY FULL instead of the number of sto

45、red tests. Data is stored for up to 10 years in battery backed RAM. CURRENT Menu There are two options, SET, and LIMIT. Set This option allows you to set the desired test current. Simply enter the desired value using the numeric keys on the keyboard and press Enter. If the current selected is greate

46、r than the limit that has been set, DLRO200 will beep, cancel your entry in the Set Current field and wait for you to enter a valid current. Limit Some samples to be tested may not be able to withstand the passing of heavy currents. In this case set a maximum level of test current to prevent the acc

47、idental entry of an excessive test current. This level defaults to 200A. If a lower limit is required enter it using the keyboard and press Enter. If the LIMIT current selected is lower than the SET current, the SET current will be reduced to the same value as the LIMIT. The Main Menu screen will sh

48、ow the active Current Limit beneath the Set Current. Warning Messages The display will, from time to time, display certain warning messages, which may affect measurement accuracy or operator safety. Test Circuit Continuity A good measurement requires both the current carrying circuit and the voltage

49、 detection circuit to be completed by the item under test. The DLRO200 checks for this continuity after the TEST button has been pressed. Initially the Potential circuit is checked. If there is poor continuity in this circuit a message will appear on the display stating POTENTIAL FAIL. Press Enter to clear this message and correct the discontinuity in the P circuit. Press TEST again. If the P circuit is complete DLRO200 will attempt to pass the test current. If the C circuit continuity is inadequate, after a little while, DLRO200 will display the message CURRENT LOOP FAIL. Press