AT2811 User
’
s Guide
12
L
H
（
microhenry
）
mH
（
millihenry
）
H
（
henry
）
C
pF
（
miicromicro
farad
）
nF
（
nanofarad
）
F
（
microfarad
）
R/Z
（
ohm
）
k
（
kiloohm
）
M
（
megohm
）
Note
：
Z take ADS, L/C/R has plus and minus. When C-D make
measurement，principal parameter displays negative value, the actual
tested component shows inductive；When L-Q measurement displays
negative values, the actual tested component shows capacitive. In theory,
R value constant is positive, under some condition, it possibly apprears R
is negative, this is caused by excessive clear zero, so please perform clear
zero in correct way.
Instrument can display maximum 5 digits, sometimes it displays 4 digits,
see the following transformational relation:
Previous
display digits
Current
measurement
pre-two value
Current
display digits
4 <33 5
5 >30 4
3.7
To set up test frequency
Frequency accuracy
：
0.02%
Press freq and then display in circulation at frequency indicator
100Hz
，
120Hz
，
1kHz
，
10kHz
3.8
AUTO and Manual range
Press AUTO to switch AUTO and hold range
Auto indicates current state, when AUTO indicator is lighted, it means AUTO range is used,
when AUTO indicator is extinguished, it means manual range is used.
3.9
To select test speed
Press Speed to switch 2 bin test speed
：
Slow: 3 times/second
Fast: 10 times/second
3.10 Clear
zero
To achieve high accuracy measurement, clear zero is necessary.
Clear zero can efficiently eliminate test clips, test lead, stray capacitance, inductance and leads
reistance, inductance inside the instrument that affect measurement. When instrument is
used with tremendous temperature change, performing clear zero is also recommended.
