DLRO 10 AND DLRO10X Digital Microhmmeter DLRO 10 and DLRO 10X Digital Microhmmeter DESCRIPTION DLRO 10 and DLRO 10X set the standards for low resistance measurement. DLRO 10 and DLRO 10X are fully automatic instruments, selecting the most suitable test current up to 10A d.c. to measure resistance from 0.1 to 2000 , on one of seven ranges. For users who desire more control over the measurement process, DLRO 10X uses a menu system controlled by a two-axis paddle to allow the user to manually select the maximum test current. DLRO 10X also adds real time download of results and on board storage for later download to a PC. Both instruments are built into a strong, lightweight case that is equally at home in the field or in the laboratory. Light enough to be worn around the neck, they are small enough to be taken into areas that were previously too small to access. DLRO 10 uses a large, bright 4 1/2 -digit LED display while DLRO 10X has a large, backlit LCD display. Normally, measurements are made with forward and reverse currents to cancel the effects of any standing voltages across the test sample. The average value is then displayed within 3 seconds, to a basic accuracy of 0.2%. DLRO 10X displays both forward and reverse measurements as well as the average of the two. DLRO 10X allows the user to set high and low pass limits, thereby enabling simple go-no-go testing. At the end of a test DLRO10X will store the test results, as well as any notes relevant to the test. Auto current reversal cancels standing emfs Protected to 600 V Automatically detects continuity in potential and current connections Multiple operating modes including fully automatic Alpha-numeric keypad for entering test notes (DLRO 10X) User selectable high and low limits (DLRO 10X) Printer output and memory (DLRO 10X) To assist operator safety and ease of use, both instruments are supplied complete with a pair of duplex handspikes with 1.2 m (4 ft) leads. One of the probes is fitted with LED's, which duplicate indicators on the instrument display indicating that all four contacts have been made, the presence of a high voltage across the load, and the presence of current flow while a load is discharging. A full range of test leads is available with probes, clamps and Kelvin clips. Nickel Metal Hydride (NiMH) batteries power the instruments. The battery packs are interchange-able so that an exhausted battery may be recharged using the external charger supplied while testing continues using a spare pack. Although full charging will take 4 hours, a fast charge mode allows the battery to be 90% charged within 2 1/2 hours from a 12 volt battery or from a standard 120/230 V AC supply via the supplied charger. The battery pack contains its own battery state indicator, which allows the charge-state to be monitored, even without being connected to the instrument. DLRO 10X is fitted with RS232 communications that will allow results to be downloaded in real time or stored for later retrieval. Up to 700 sets of results may be stored within DLRO 10X complete with notes containing up to 200 characters which may be added using the on board keypad. These results can also be downloaded to a PC. MEASUREMENT MODES: A variety of measurement modes are available. Since the introduction of V2.0 firmware, Normal, Auto, Continuous and Inductive mode are available on both the DLRO 10 and the DLRO 10X. DLRO 10 AND DLRO 10X Digital Microhmmeter DLRO 10 will display the average of the measurements achieved using forward and reverse current, while DLRO 10X displays both individual measurements and the average. Normal mode initiates a test by pressing the Test button on the instrument front panel after connecting the test leads. Continuity of all four connections is checked, forward and reverse currents are applied. Auto mode allows forward and reverse current measurements to be made and the average displayed simply by making contact with all four probes. This mode is ideal when working with the supplied handspikes. Each time the probes are removed and reconnected to the load another test will be performed without the need to press the test button on the instrument. Continuous mode allows repeated measurements to be made on the same sample. Simply connect the test leads and press the test button. The measurement is updated every 3 seconds until the circuit is broken. Inductive mode is intended for use when measuring inductive loads. When measuring inductive loads it is necessary to wait for the voltage to stabilise. This means that the measurement could take a few seconds or several minutes. The test leads are firmly connected to the item to be measured and the Test button is pressed. The instrument will pass a current through the sample and wait for the voltage to stabilise. If possible the current will be increased. This procedure will be repeated until the voltage detected falls into the range 15 mV to 200 mV. The instrument will then continue to take readings, which will gradually decrease to the true value as the voltage stabilises further. The operator decides when the result is stable and presses the Test button to terminate the test. Measurement is made with forward current only. FEATURES AND BENEFITS Small, lightweight and portable - can be used in tight places, reduces the need for extra long leads and two person operation. Four terminal resistance method shows the true resistance of the item under test. Bright LED (DLRO 10) and LCD (DLRO 10X) displays are easily visible under all lighting conditions and reduce human error. Automatically applies forward and reverse currents which cancel out any standing voltages across the sample under test. Checks for undue noise during measurement, reducing the possibility of recording the incorrect result. Automatically detects continuity in P and C circuits, preventing erroneously high reading to be taken due to high resistance contact. Battery module has a battery condition indicator allowing the user to check the state of spare batteries without connecting to the instrument. RS232 connector on the DLRO 10X allows downloading of results in real time or stored for later retrieval. Unidirectional mode, on DLRO 10X only, applies a current in one direction only. This does not enable any standing emfs to be negated but speeds up the measurement process. Test starts automatically when probes are connected. APPLICATIONS The needs for accurate low resistance measurement are well known and very diverse. They range through Goods Receiving inspection of components to ground bonding and welded joints. Typical applications include, but are not limited to, making d.c. resistance measurements of: Switch and contact breaker resistance Busbar and cable joints Aircraft frame bonds and static control circuits Integrity of welded joints Inter-cell connections on battery systems up to 600 V peak Quality control of resistive components Transformer and motor winding resistance Rail and pipe bonds Metal alloys, welds and fuse resistance Graphite electrodes and other composites Wire and cable resistance Transmitter aerial and lightning conductor bonding The DLROs are light enough to be worn around the neck. They are also small enough to be taken into areas which were previously too cramped for easy testing. DLRO 10 AND DLRO 10X Digital Microhmmeter Full Scale Volts Test Current Full Scale Resolution Accuracy Resistive Inductive Resistive Inductive 1.9999 m 0.1 0.2% 0.2 20 mV n/a 10 A n/a 19.999 m 1 0.2% 2 20 mV 20 mV 1A 1A 199.99 m 10 0.2% 20 20 mV 200 mV 100 mA 1A 1.9999 100 0.2% 0.2 m 20 mV 200 mV 10 mA 100 mA 19.999 1 m 0.2% 2 m 20 mV 200 mV 1 mA 10 mA 199.99 10 m 0.2% 20 m 20 mV 200 mV 100 A 1 mA 1999.9 100 m 0.2% 0.2 200 mV 200 mV 100 A 100 A DLRO 10 Measurement: Mode: Control: Speed: Display: Measurement: Range and Safety: Test Method: DLRO 10X Manual, Auto, Continuous, Manual, Auto, Continuous, High Power High Power, Unidirectional Fully Automatic Fully Automatic/Manual <3s for forward & reverse current and to display average 41/2 digit seven segment LED LED indication Large backlit LCD Single cycle reversing d.c. ratiometric measurement -average result display. Test Current: Accuracy: Stability: 10% <10 ppm per second Maximum Lead Resistance: 100 m total for 10A operation irrespective of battery condition. Voltmeter input impedance: > 200 k Hum rejection: Less than 1% 20 digits additional error with 100 mV peak 50/60 Hz. on the potential leads. Warning will show if hum or noise exceeds this level. Data: Transfer: Real Time or from storage via RS232 Storage: 700 tests Up to 256 characters per test via integral alphanumeric keypad Memo Field Battery: Capacity: Life: Charging Rate: Temperature: 7 Ah NiMH rechargeable Typically 1000 x 10 A tests before recharge Recharge: Via External 90V - 260V 50/60 Hz charger or from 12 to 15V d.c. supply Standard: 2.5 hours to 90% capacity, 4 hrs for full charge Operation: Storage: +5C to +45C (41F to 113F) at full specification -10C to +50C (14F to 122F) at reduced accuracy Calibration: -30C to +70C (-22F to 158F)20C (68F) Co-efficient: <0.01% per C over range 5C to 40C Slow charging: Fast charging: <0.01% per C from 5C to 40C (<0.006% per oF from 41F to 104F) 0C to +45C (32F to 113F) Humidity (max): +10C to +45C (50F to 113F) Altitude (max): 90% RH @ 40C (104F) non-condensing Safety: 2000m (6500 ft) to full safety specifications EMC: In accordance with EN61010-1 600V Category III The instrument meets EN50081-1 and EN50082-1 (1992) Dimensions: 220 x 100 x 237 mm (8.6 x 4 x 9.5 in) Weight: 2.6 kg (5 3/4 lb.) including battery module. DLRO 10 AND DLRO 10X Digital Microhmmeter ORDERING INFORMATION Item (Qty) Order No. DLRO 10 Digital Low Resistance Ohmmeter 6111-428 DLRO10X Digital Low Resistance Ohmmeter 6111-429 Complete with 7 Ah NiMH battery module. 6340-101 DH4 Duplex handspikes (2), one with indicator lights. 1.2m / 4 ft 6111-503 Battery charger for operation from 115/230 V . 50/60Hz supply. 6280-333 Cigar lighter adapter for battery charging. 6280-332 User guide. 6172-473 Warranty book. 6170-618 Optional Accessories at extra cost Carrying case for DLRO10/10X and all standard accessories. 6380-138 Carrying case for optional lead sets. 18313 Calibration Shunt,10 , current rating 1 mA. 249000 Calibration Shunt, 1 , current rating 10 mA. 249001 Calibration Shunt, 100 m current rating 1A. 249002 Calibration Shunt, 10 m current rating 10 A. 249003 Certificate of Calibration for Shunts, NIST CERT-NIST Replacement tips for DH4, DH5 and DH6 handspikes. Needle point Serrated end Optional Test Leads at extra cost Duplex Leads DH5 straight duplex handspikes (2). One has indicator lights. 2.5m/8ft DH6 Duplex handspikes (2) suitable for working on 600 V. systems. 2.5m/8ft Duplex Handspikes (2) with spring loaded helical contacts. 2m/7ft 2.5m/8ft 5.5m/18ft 6m/20ft 9m/30ft UK Archcliffe Road Dover CT17 9EN England T +44 (0) 1304 502101 F +44 (0) 1304 207342 25940-012 25940-014 Item (Qty) Straight Duplex Handspikes (2) Heavy Duty with fixed contacts. Duplex Heavy Duty 5cm (2") C-Clamps. (2) Order No. 2m/7ft 5.5m/18ft 9m/30ft 242002-7 242002-18 242002-30 2m/7ft 5.5m/18ft 9m/30ft 242004-7 242004-18 242004-30 Duplex handspikes with replaceable Needle Points 2m/7ft Duplex 1.27 cm (1/2 ") Kelvin Clips. (2) gold plated 2m/7ft silver plated 2m/7ft Duplex 3.8 cm (11/2") Kelvin Clips. (2) 2m/7ft 5.5m/18ft 9m/30ft Single Leads Single handspike (1) for potential measurement. 2m/7ft 5.5m/18ft Current clip (1) for current connections. 242003-7 241005-7 242005-7 242006-7 242006-18 242006-30 242021-7 242021-18 9m/30ft 242021-30 2m/7ft 5.5m/18ft 9m/30ft 242041-7 242041-18 242041-30 6111-517 6111-518 242011-7 6111-022 242011-18 6111-023 242011-30 UNITED STATES 4271 Bronze Way Dallas TX 75237-1088 USA T 800 723 2861 (USA only) T +1 214 333 3201 F +1 214 331 7399 OTHER TECHNICAL SALES OFFICES Norristown USA, Toronto CANADA, Mumbai INDIA, Trappes FRANCE, Sydney AUSTRALIA, Madrid SPAIN and the Kingdom of BAHRAIN. Registered to ISO 9001:2000 Reg no. Q 09290 Registered to ISO 14001 Reg no. EMS 61597 DLR10_DLRO10X_DS_en_V10 www.megger.com Megger is a registered trademark