• Measurement Modes A variety of measurement modes are available. Normal, Auto, Continuous and High Power are available on both the DLRO10 and the DLRO 10X.

• Normal mode initiates a test by pressing the Test button on the instrument's 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.

• High Power mode overrides the 250 milliwatt power limit thereby allowing higher voltages to be applied to the load. As this feature is usually applicable to small inductive loads, the measurement takes longer as the current needs to stabilize before a measurement can be taken.

• Unidirectional mode, on DLRO10X only, applies a current in one direction only. This does not enable any standing emfs to be negated but speeds up the measurement process. DLRO10 will display the average of the measurements achieved using forward and reverse current, while DLRO10X displays both individual measurements and the average.

APPLICATIONS

The needs for accurate low resistance measurement are well known and very diverse. They range through receiving, inspection of components to ground bonding and welded joints. Typical end users include utilities, telecom, railroads, aviation, manufacturing facilities, and process control plants. Applications include, but are not limited to, making dc resistance measurements for:

• Switch and contact breaker resistance
• Busbar and cable joints
• Aircraft frame bonds and static control circuits
• Integrity of welded joints
• Intercell strap connections on battery systems up to 600 V peak
• Quality control of resistive components
• Small 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

FEATURES AND BENEFITS

• Small, lightweight and portable — can be used in tight places, reduces the need for extra long leads and twoperson operation.
• Four-terminal resistance method shows the true resistance of the item under test.
• Bright LED (DLRO10) and LCD (DLRO10X) displays are easily visible under all lighting conditions and reduces human error.
• Automatically applies forward and reverse currents which cancels 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 readings to be taken due to high resistance contact.
• Battery module features smart charging circuit, reducing accidental damage and cost.
• 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 DLRO10X allows downloading of results in real time or stored for later retrieval.