Datasheet

DLRO10HD
10 A Digital Low Resistance Ohmmeter
Automatic mode is started as soon as the probes make
contact. Forward and reverse current measurements are
made and the average value is displayed. This mode is
ideal when working with the supplied DH4 handspikes.
Each time the probes are removed and reconnected to
the load a new test will be performed without the need to
press the test button.
TEST modes
Automatic unidirectional mode applies current in one
direction only to speed up the measurement process.
However thermal EMF resulting from dissimilar metal
bonds can cause lower accuracy. Test starts automatically
when probes are connected.
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 three seconds until the circuit is broken.
Inductive mode is selected when measuring resistance
on, for example, motors and generators. When measuring
inductive loads it is necessary to wait for the voltage to
stabilise as the inductive element is charged. Test leads
are firmly connected to the device under test and the
‘Test’ button pressed. The instrument will pass the
selected current through the sample continuously in one
direction only and take repetitive readings that will
gradually decrease to the true value as the voltage
stabilises. The operator decides when the result is stable
and presses the ‘Test’ button to terminate the test.
ELECTRICAL SPECIFICATIONS
Resistance/Current Ranges
The green resistance ranges on the keypad indicate low
output power (<0.25 W) outputs. Red ranges indicate
higher 2.5 W (1 A) and 25 W (10 A) power outputs.
Resolution and Accuracy
Test current accuracy ±10%
Voltmeter input impedance >200 kΩ
Test
current
Resistance
range
Resolution
(as
displayed)
Basic
accuracy*
Full
scale
voltage
Max.
power
output
0.1 mA
0 to
2500.0 Ω
0.1 Ω ±0.2% 25 mV 25 μW
0.1 mA
0 to
250.00 Ω
0.01 Ω ±0.2% 25 mV 2.5 μW
1 mA
0 to
25.000 Ω
1 mΩ ±0.2% 25 mV 25 μW
10 mA
0 to
2500.0 mΩ
0.1 mΩ ±0.2% 25mV 250 μW
100 mA
0 to
250.00 mΩ
0.01 mΩ ±0.2% 25 mV 2.5 mW
1 A
0 to
25.000 mΩ
1 μΩ ±0.2% 25 mV 25 mW
10 A
0 to
2500.0 μΩ
0.1 μΩ ±0.2% 25 mV 0.25 W
1 A
0 to
2500.0 mΩ
0.1 mΩ ±0.2% 2.5 V 2.5 W
10 A
0 to
250.00 mΩ
0.01 mΩ ±0.2% 2.5 V 25 W
* The accuracy stated assumes forward and reverse
measurements.
Inductive mode or undirectional mode will introduce an
undefined error if an external EMF is present.
Basic accuracy at reference conditions.
GENERAL SPECIFICATIONS
Temperature coefficient < 0.01% per ºC, from 5 ºC to
40 ºC
Maximum altitude 2000m (6562 ft) to full safety
specifications
Display size/type Main 5 digit + 2 x 5 digit
secondary displays
Battery type 6 V, 7Ah sealed lead acid
Voltage input range 90 - 264 V, 50-60 Hz
Charge time 8 hours
Backlight LED backlight
Battery life >1000 Auto (3 sec) tests
Auto power down 300s
Mode selection Rotary switch
Range selection Rotary switch
Weight 6.7 kg
Case dimensions L315 mm x W285 mm x
H181 mm
Pouch for test leads Yes (lid mounted)
Test leads DH4 lead set included
IP rating IP65 case closed, IP54 battery
operation
Safety rating
In accordance with IEC61010-1, CATIII 300V when used
with optional terminal cover (details in ordering information)
Operating temperature
and humidity -10 °C to +50 °C
(14 °F to 122 °F) <90% RH
Reference conditions 20 °C ±3 °C
Storage temperature and
humidity -25 °C to +60 °C, <90% RH
EMC
In accordance with IEC61326-1 (Heavy industrial)
Noise 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.
Maximum lead resistance
100 mΩ total for 10 A operation irrespective of battery
condition.