Range; Internal Resistance; Mode - UNI-T UTR2810E Series User Manual

3.2.5 Range

UTR2810E/2811E provides 12 range 3Ω，10Ω， 30Ω，100Ω，300Ω，1kΩ，3 kΩ，10kΩ，30k，100kΩ, 300kΩ
and Auto. The effective measuring range of each range is shown below.
1. If the range is auto, the instrument will make range prediction at each measurement period, so
the test speed will be slower than the locking range. Change the range frequently will reduce
response. In general, automatic range is not suitable for sorting measurement.
The nominal rang is for sorting measurement.
2. The overload mark "----" will be displayed when the size of the test element exceeds the test
range or exceeds the display range of the instrument when the range is maintained.

3.2.6 Internal Resistance

UTR2810E/2811E provides 30Ω and 100Ω signal source internal resistance. In the same test voltage, select different
signal source internal resistance will get different test current. The test results will be different if the measured part is
sensitive to the test current. The instrument provides two kinds of different signal source internal resistance, which
can be convenient for users to compare the test results with other instrument manufacturers at home and abroad.
Internal Resistance
30Ω
100Ω

3.2.7 Mode

UTR2810E/2811E can SER or PAR two equivalent circuit to measuring L, C, or R.
（1）The choice of capacitance equivalent circuit
Small capacity corresponds to high impedance value, and the influence of parallel resistance is greater than
series resistance. At this point the series resistance compared to the impedance of the capacitor is very small,
it can be negligible. Therefore, the parallel equivalent method should be selected for measurement.
On the contrary, large capacity corresponds to low impedance value, and the parallel resistance compared to
impedance of the capacitor is very large, it can be negligible. The influence of series resistance is greater than
parallel resistance. Therefore, the series equivalent method should be selected for measurement.
Generally speaking, capacitive equivalent circuits can select by the rule
When the choice is greater than 10kΩ, select parallel mode
When the choice is less than 10kΩ, select series mode
Speed Description
FAST About 23.3 times per second
MED About 5.4 times per second
SLOW About 2.8 times per second
No. Range
300 kΩ
0
100 kΩ
1
30 kΩ
2
10 kΩ
3
3kΩ
4
1kΩ
5
300Ω
6
100Ω
7
30Ω
8
10Ω
9
3Ω
10
11 Auto
Description
The current signal source internal resistance is 30Ω
The current signal source internal resistance is 100Ω
UTR2810E Series LCR Meter – User Manual
Effective measurement
range
300kΩ-99.9999MΩ
100kΩ-300kΩ
30kΩ-100kΩ
10kΩ-30kΩ
3kΩ-10kΩ
1kΩ-3kΩ
300Ω-1kΩ
100Ω-300Ω
30Ω-100Ω
10Ω-30Ω
10uΩ-10Ω
10uΩ-99.9999MΩ
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