NF ZM2371 - Connection to DUT

3.4 Connection of DUT
3-14 ZM2371/ZM2372
 Measurement signals
Main specifications of measurement signals are as follows:
Signal level Voltage: 10mVrms to 5Vrms (ALC possible)
Constant current: 1 Arms to 200mArms (range depends on
measurement range, etc.)
Max. about 7.1Vpk voltage including DC bias is output.
Output impedance About 5 / 25 / 100 (depending on measurement range, etc.)
Max. drive current About 200mArms
3.4.2 Connection to DUT
Connect ZM2371 / ZM2372 and DUT with 4-terminal (4-terminal-pair) as shown below to
avoid the influence of contact resistance.
Figure 3–4 Connection to DUT
In the measurement of high impedance, shielding around the DUT can restrict variation of
measured value. In a simplified method, place an insulating plate on the top surface of
ZM2371 / ZM2372, and measure the DUT on it.
The ZM2371 / ZM2372 cannot measure the grounded DUT. Both ends of DUT must be both
insulated from the grounding.
When commercially available test fixture or test lead is used, refer to the instruction
manual of these products. The product in which the shields of respective terminals are not
connected cannot be used together with the ZM2371 / ZM2372.
DUT
HCUR
LCUR
HPOT
LPOT
Shield plate
Insulating plate
LCR meter
Use four coaxial cables having BNC
connector.
Connect 4 shields together on the
DUT side.
When the measured value is unstable due to a noise, lay a metallic plate connected
to the outer conductor (shields) of measurement cables or the case under the DUT
for shielding.