Application; Est Leads Connection - BK Precision 885 Manual De Instrucciones

4. Application

4.1 Test Leads Connection
Auto balancing bridge has four terminals (H
L ) to connect to the device under test (DUT). It is important to
POT
understand what connection method will affect the measurement
accuracy.
 2-Terminal (2T)
2-Terminal is the easiest way to connect the DUT, but it contents
many errors which are the inductor and resistor as well as the
parasitic capacitor of the test leads (Figure 3.1). Due to these
errors in measurement, the effective impedance measurement
range will be limited at 100 to 10K.
H
CUR
H
POT
L
POT
L
CUR
(a) CONNECTION
1m 10m 100m 1
(c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[)
 3-Terminal (3T)
V
DUT
2T
10 100 1K 10K 100K 1M
Figure 3.1
29
, H
CUR
R
o
A
R
o
(b) BLOCK DIAGRAM
, L and
POT CUR
L
o
Co
DUT
L
o
10M