UNI-T UTR2810E Series, Руководство пользователя

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UTR2810E Series LCR Meter
– User Manual
15
Speed Description
FAST About 23.3 times per second
MED About 5.4 times per second
SLOW About 2.8 times per second
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.
No. Range
Effective measurement
range
0
300 kΩ 300kΩ-99.9999MΩ
1
100 kΩ 100kΩ-300kΩ
2
30 kΩ 30kΩ-100kΩ
3
10 kΩ 10kΩ-30kΩ
4
3kΩ 3kΩ-10kΩ
5
1kΩ 1kΩ-3kΩ
6
300Ω 300Ω-1kΩ
7
100Ω 100Ω-300Ω
8
30Ω 30Ω-100Ω
9
10Ω 10Ω-30Ω
10
3Ω 10uΩ-10Ω
11 Auto
10uΩ-99.9999MΩ
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 Description
30Ω The current signal source internal resistance is 30Ω
100Ω The current signal source internal resistance is 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 g
reater than 10kΩ, select parallel mode
When the choice is less than 10kΩ, select series mode