Biddle DLRO600_UG 电路图.pdf

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1、M DLRO600 High Current, Low Resistance Ohmmeter USER MANUAL DLRO600_UG_en_V04.qxp 11/11/08 1:27 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. IDLRO600 is supplied without a plug terminating the supply lead. An appr

2、opriate plug must be fitted prior to use. The instrument can draw 25 amps when running at full current output so please ensure an appropriate plug is used. IThe DLRO600 must be grounded (earthed) when in use. If the ground / earth in the socket outlet being used to energise the DLRO600 cannot be rel

3、ied upon, the instrument must be connected to a reliable earth / ground via the large green and yellow terminal on 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 DLRO600 must only be

4、 used on dead systems. If the item under test has a voltage upon it greater than 10 volts ac peak or dc with reference to ground the DLRO600 will indicate the presence of the voltage and prevent any tests being carried out. ITesting inductive circuits can be hazardous: The DLRO600 is a high power in

5、strument, with an output power measured in kilowatts, designed for testing resistive loads. It must NOT be used to test inductive loads. IDuring use the DLRO600, 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

6、 touching the instrument, current leads, clips and the test sample. IThis product is not intrinsically safe. Do not use in an explosive atmosphere. IEnsure that the power switch is always accessible so that power can be disconnected in an emergency. IIf this equipment is used in a manner not specifi

7、ed by the manufacturer, the protection provided by the equipment may be impaired. 2 DLRO600_UG_en_V04.qxp 11/11/08 1:27 pm Page 2 RadioFans.CN 收音机爱 好者资料库 SYMBOLS USED IN THIS DOCUMENT AND ON THE INSTRUMENT uProtective Conductor Terminal sHot Terminals GRefer to the User Manual for more information 1

8、Power On 0Power Off cEquipment complies with relevant EU Directives CONTENTS 3 SAFETY WARNINGS2 GENERAL DESCRIPTION4 OPERATION5 Main Menu Screen5 TEST Menu6 OPTIONS Menu7 CURRENT Menu9 Warning Messages9 Entering Notes In The Memo Screen9 Test Result Storage10 Real Time downloading of test data.10 TE

9、ST TECHNIQUES TEST, OPTIONS and “CURRENT. Below this are details of the test current selected (SET CURRENT), maximum current to be allowed (CURRENT LIMIT), the number of stored tests and the current date and time. To perform a measurement is straightforward. 1. Use the Left and Right arrows of the t

10、wo-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-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

11、numeric keys on the keypad. When finished press Enter. If the current you have set is greater than the current limit, DLRO600 will beep and clear the SET CURRENT field. Re-enter the desired current, if necessary increasing the current limit to a value equal to or greater than the desired level. (See

12、 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 types have slightly different connection requirements, which are detailed, in the sections below. Please note that if your DLRO600 is inadequat

13、ely grounded / earthed it will OPERATION 5 Terminate the supply lead with a plug suitable for your circumstances. Plug the instrument supply lead into a socket outlet and switch the instrument on using the On/Off switch situated on the left side of the instrument. The POWER lamp will illuminate, the

14、 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 display will show NOT CALIBRATED”. After a slight pause the display will change to the Main Menu screen. DLRO 600 V1.00 COPYRIGHT MEGGE

15、R LIMITED 2002 INITIALISING HARDWARE CALIBRATED TEST OPTIONS CURRENT SET CURRENT450 CURRENT LIMIT 500 23 TESTS STORED 21/03/02 15:13 DLRO600_UG_en_V04.qxp 11/11/08 1:27 pm Page 5 6 OPERATION not be possible to start a test. TEST Menu The TEST menu allows the selection of one of three test modes - No

16、rmal, 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 MENU 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

17、current and voltage leads must be connected across the test sample before the Test button is pressed. When the TEST button is pressed DLRO600 will check for 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 m

18、essage 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 satisfactory DLRO600 will proceed to carry out a test. After a short period of time, if there is inadequate contact in the C circuit the instrume

19、nt 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 bars will appear across the display while the test is being completed. To make another measurement, ensure the test leads are connected and press

20、 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 leads and the voltage leads to be securely connected to the item under test before pressing the Test button. The DLRO600 checks voltage and curren

21、t loop continuity as in Normal Mode and, if adequate, passes a continuous d.c. current, repeating resistance measurements at approximately 2-second intervals until the test is terminated by pressing the Test button (or until the DLRO600 overheats if particularly high currents are used). CONTINUOUS m

22、ode is abbreviated to CONT under the TEST heading in the main menu screen. Overheating When operating continuously at 600 A, overheating will occur after approximately 3 minutes (assuming a starting temperature of 20C). A message HOT will then appear on the display until the internal parts have cool

23、ed. 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 considerably extend the operating time. Automatic Mode In Automatic mode, only connect the current leads to the sample to be measured. Press the TEST but

24、ton. The red status lamp next to the TEST button will flash signifying that DLRO600 is armed and will remain in a state of readiness until the P circuit is 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 o

25、f 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 example, 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 wi

26、ll only flow during a measurement i.e. when the P probes are connected. Simply making contact with voltage probes across the joint(s) you wish to measure will then activate the measurement. DLRO600_UG_en_V04.qxp 11/11/08 1:27 pm Page 6 OPERATION 7 Downloading data does not cause the stored data to b

27、e erased from memory. To clear data from memory see Delete Data below. Please note DLRO600 also makes data available via 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 F

28、ormat Date Time Selected Current Resistance Measured Current Measured Voltage Upper Limit * Lower Limit * Pass Or Fail * * The last three lines will only appear if passbands have been set. Passbands The passband option allows you to set upper and lower limits between which the test result must lie i

29、f it is to be assigned a Pass. Readings that fall 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. OPTIONS Menu The Options menu has five selections, which control various anc

30、illary 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 within the DLRO600s internal memory. There are two choices, Display or Download

31、. 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. If you know the number of the test that you wish to display simply type in

32、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 contents of the data store to be output to the RS232 port above the display.

33、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. If using another package please note the settings should be 9600 baud, 8 dat

34、a bits, 1 stop bit, and no parity. DLRO600_UG_en_V04.qxp 11/11/08 1:27 pm Page 7 OPERATION 8 The 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 seq

35、uence regardless of the date format you wish to use. The lower DD/MM/YY shows the current date format. 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 alr

36、eady stored prior to changing the date format will retain the old format. Delete Data Select Delete Data if you wish to clear DLRO600s 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 thi

37、s to YES and press Enter if you wish to delete all data. Please note - ALL stored data will be deleted. 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 t

38、ests. At the end of each test you may enter notes into the MEMO screen, which is accessed by pressing any key on the alphanumeric keyboard. This will also cause the test to be automatically stored regardless of other settings. If all memory has been filled, a message MEMORY FULL will appear and no m

39、ore 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 stored tests. Data is stored for up to 10 years in battery backed RAM. above the upper limit or below the lower limit will be assign

40、ed a Fail. The upper and lower limits are entered via the keyboard complete with decimal points, where applicable, and including the m or m symbol as appropriate. It is not necessary to enter the symbol. Entering the m or symbol tells DLRO600 that the entry in that particular field is complete and t

41、he 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 options. Highlight your choice using the right and l

42、eft 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 vice versa, enter the PASSBAND screen and press En

43、ter 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 the end of a test the display will show the resul

44、ts 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. When you enter this screen the current date, time

45、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. DLRO600_UG_en_V04.qxp 11/11/08 1:27 pm Page 8 OPERATION 9 CURRENT Menu There are two options, SET, and LIMIT. Set This option al

46、lows 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 greater than the limit that has been set, DLRO600 will beep, cancel your entry in the Set Current field and wait for you to enter a valid curren

47、t. 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 accidental entry of an excessive test current. This level defaults to 600A. If a lower limit is required enter it using the keyboard and pres

48、s 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 show the active Current Limit beneath the Set Current. Warning Messages The display will, from time to time, display certain warning message

49、s, which may affect measurement accuracy or operator safety. Test Circuit Continuity A good measurement requires both the current carrying circuit and the voltage detection circuit to be completed by the item under test. The DLRO600 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 DLRO600