Tonghui TH2821A - 3.2 How to operate

TH2821A OPERATION MANUAL
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3.2 How to operate
3.2.1 First Key Functions
1. Parameter Setup：
Press PARA key to select the following measurement
parameter combinations：L-Q, C-D, R-Q and Z-Q.
Units Description:
L
µH
mH H
C pF nF
µF
R/|Z|
Ω
kΩ MΩ
Table 4-1 Units
|Z| is the absolute value of impedance. Measurement
value of L, C or R may be positive or negative. Negative
capacitance value means that the device under test is
actually an inductor; also negative inductance value means
that the device under test is actually a capacitor. In theory
R should be positive constantly, under some condition, R
may be negative due to over zero correction. Please carry
out correct zero correction.
The maximum number of display digits is 5, but 5-digit is
not always available and 4-digit is displayed sometimes.
The conversion is described in the following description:
From 4-digit to 5-digit:
When the first 2 digit of current value is less than 18.
From 5-digit to 4-digit:
When the first 2 digit of current value is more than 20.
2. Frequency Setup:
Use FREQ key to select the following test frequencies in
turn: 100 Hz, 120 Hz ，1 kHz and 10 kHz.