AT381x User's Guide
26
4.1.2
Impedance Range [RANGE]
Table 4-4
Impedance range mode
Mode
Function overview
Advantage
Disadvantage
Auto
Range
The instrument automatically
selects the best test range based
on impedance value. The range
number in range field is
automatically set.
Users do not need
any participation
Auto range requires
predictive range
and test speed will
be lower than the
manual range
mode, which is
especially
noticeable at low
frequencies (below
1 kHz).
Hold
Range
Measurement is performed with
a fixed impedance range
Test speed is the
fastest.
Users need to
participate in the
range selection
Nominal
Range
AT381x sets the optimum range
depending on the nominal
value.
The best way for sort
test. Speed is the
fastest.
Valid only in the
sorting mode.
Available impedance range
：
The instrument has 9 ranges, they includes: 10
Ω
，
30
Ω
，
100
Ω
，
300
Ω
，
1k
Ω
，
3k
Ω
，
10k
Ω
，
30k
Ω
，
100k
Ω
.
During the test, the instrument selects appropriate range according to impedance of the
device under test.
Table 4-5
Range and corresponding test range
Range No. Range Definition Impedance Measuring Range
8
10
Ω
0
～
10
Ω
7
30
Ω
10
Ω
～
100
Ω
6
100
Ω
100
Ω
～
316
Ω
5
300
Ω
316
Ω
～
1k
Ω
4
1k
Ω
1k
Ω
～
3.16k
Ω
3
3k
Ω
3.16k
Ω
～
10k
Ω
2
10k
Ω
10k
Ω
～
31.6k
Ω
1
30k
Ω
31.6k
Ω
～
100k
Ω
（
∞
）
0
100k
Ω
100k
Ω
～
∞
Procedure for setting the impedance range [RANGE]
Step 1
Press [Meas] key to enter <MEAS DISPLAY> page;
Step 2
Use the cursor keys to select [RANGE] field;
Soft key
Function
AUTO RANGE
The instrument will automatically select the range
HOLD RANGE
The instrument is locked on the current range
NORMINAL RANGE
The instrument will select the best range based on the nominal value.
INCR +
Increase range number while the range is changed to be locked
DECR -
Decrement range number while the range is changed to be locked