Cầu đo điện trở 1 chiều OM 21
Display
26 000 counts, 16-segment illuminated
LCD, 11.5 mm high, alphanumeric characters for messages, measurement indication includes value and unit of measurement.
Incorrect connections or measurements
going beyond range are indicated by an
error message.
Manual or automatic range change.
Manual or automatic measurement triggering, with measurement rate programmable
from one measurement per second to one
per hour.
Four-wire measurement.
Measurement current
• Amplitude selection (from 100 µA to 10 A)
• Waveform selection
- continuous,
- alternate pulses,
- positive pulses,
• With each type of current, measurements can be single-shot or repetitive (pos- sibility to select the repetition rate)
• Current may also be supplied from an
external source.
Measurement time...............................
< 1 second in continuous mode,
< 1.5 second in pulsed mode,
< 2 seconds in alternating pulsed mode.
Protection
• Electronic protection against break-off
currents when measuring an inductive
resistance,
• Possibility of limiting the voltage across
the resistor terminals to 20 or 50 mV.
Environment
Nominal operating range: 0 to 50°C, 20
to 75% relative humidity.
Operating range limits: -10 to 55°C, 10
to 80% relative humidity.
Power supply
• 110/220 VAC ± 10%, 50/60 Hz,
• optional battery with built-in charger.
Presentation
Bench unit with optional rack mounting
kit.
Dimensions: 225 x 88 x 300 mm.
Weight: 2 to 3 kg depending on options
The instrument measures very low value
resistances in a four- w i re term i n a l .
It has eight measurement ranges. For the
same current, the range can be changed
manually or automatically.
The user has a choice of three current values for each measurement range, except
for the extreme ranges.
Temperature coefficient < 10% of the
accuracy per degree Celsius.
Automatic compensation for thermal
electromotive forces (emfs)..................
Cầu đo điện trở 1 chiều OM 21
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R a n g e
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R e s o l u t i o n
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M e a s u rement current
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Voltage drop
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Accuracy (1)
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2 mΩ
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0.1 µΩ
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10A
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20 mV
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0.05% + 0.3 µΩ
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20 mΩ
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1 µΩ
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10A
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200 mV
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0.05% + 2 µΩ
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20 mΩ
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1 µΩ
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1A
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20 mV
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0.05% + 3 µΩ
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200 mΩ
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10 µΩ
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10A
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2 V
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0.05% + 10 µΩ
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200 mΩ
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10 µΩ
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1A
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200 mV
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0.05% + 20 µΩ
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200 mΩ
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10 µΩ
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100mA
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20 mV
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0.03% + 30 µΩ
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2 Ω
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100 µΩ
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10A
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2 V
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0.05% + 100 µΩ
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2 Ω
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100 µΩ
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100 mA
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200 mV
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0.03% + 200 µΩ
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2 Ω
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100 µΩ
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10 mA
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20 m
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0.03% + 300 µΩ
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20 Ω
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1 mΩ
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100 mA
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2 V
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0.03% + 1 mΩ
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20 Ω
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1 mΩ
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10 mA
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200 mV
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0.03% + 2 mΩ
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20 Ω
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1 mΩ
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1 m
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20 m
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0.03% + 3 mΩ
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200 Ω
200 Ω
200 Ω
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10 mΩ
10 mΩ
10 mΩ
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10 mA
1 mA
100 µA
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2 V
200 mV
20 m
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0.03% + 10 mΩ
0.03% + 20 mΩ
0.03% + 30 mΩ
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2 kΩ
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100 mΩ
100 mΩ
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1 mA
100 µA
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2 V
200 mV
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0.03 % + 100 mΩ
0.03 % + 200 mΩ
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20 kΩ
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1 Ω
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100 µA
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2 V
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0.03% + 1 Ω
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(1) The accuracy is given as ± (% of the reading + counts).The count corresponds to the value of the last figure displayed, i.e.
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to the resolution on this range. The accuracy is given over 90 days at 23±1°C
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