NF ZM2371, Instruction Manual

Page: 76 / 255

3.5 Basic Operations
3-46 ZM2371/ZM2372

Measurement of OPEN correction value
First, place the measurement terminals in open state.
Figure 3
–7 Terminal processing at OPEN correction
To measure the OPEN correction value, press the
_ SHIFT _ + [OPEN]
keys to display the
OPEN correction menu, and select Measure with a numeric key. With the initial setting, it
will take about 23s to measure the correction value.
During the measurement of OPEN correction value, the following message is displayed.
O P E N M e a s u r e m e n t ( > 1 k

)
R u n n i n g 9 ) A B O R T
The measurement of OPEN correction value can be aborted by pressing the
_ 9 _
key. The
above message is also used as the correction value measurement abort menu.
Upon completion of OPEN correction value measurement, the OPEN correction is enabled,
and the following completion message is displayed for a short time, and then the
measurement screen comes back.
C o m p l e t e d C o r r e c t i o n O N
However, when measured value
≦
1k

, the following warning message is displayed.
Wa r n i n g : O u t o f r a n g e
Same warning message is also displayed when the measurement failed by any reason. Even
if this warning message is displayed, the
ZM2371 / ZM2372
use the obtained measured value
as OPEN correction value. However, the previous OPEN correction value is held for the
frequency at which the measurement failed.
This warning will disappear automatically. It also can be reset by operating any key.
Perform the EXIT operation to return to one-previous menu.
Even if either OPEN, SHORT, or LOAD correction is enabled, unless the following condition
is fulfilled, any of OPEN, SHORT, or LOAD correction is not executed and the measured
value becomes CORR Err.
Condition for correction: OPEN correction value (|Z|) > SHORT correction value (|Z|)  2
Connect H
CUR
and
H
POT
Connect L
CUR
and
L
POT
Retain same distance as that
during DUT measurement
Retain positional relation to ambient
dielectrics and conductors same as that
during DUT measurement
Connect outer conductor (shield) of 4
coaxial cables together
L
CUR
L
POT
H
POT
H
CUR