Hioki 3504-40 C HiTester, Instruction Manual

Page: 101 / 292

6.3 Evaluate Contact Check Function
95
9
6
The contact check evaluation function has the following three components.
•
Exclude abnormally low measurement results
(Low C reject function)
(p. 96)
As for the measurement on 2-terminal connection, if C measurement value is
abnormally small, it detects the measurement result as an error.
It can discern whether or not the contact pin and the sample are in contact
with one another.
If a relative percentage the full scale of the currently selected range is set as a
limit value, this function detects it as a contact error if the reading is lower than
the limit value. For example, if 1% is set for a 200 nF range, measurement val-
ues lower than 2 nF will be detected as contact errors. This judgment is based
on the measurement value after OPEN, SHORT and LOAD compensation.
During a contact error the measurement value and comparator as well as BIN
judgment results will be made normally. If the measurement value after offset
compensation is smaller than the limit value, there will not be a contact error.
•
Exclude chattering during contact
(measurement level monitoring function)
(p. 98)
By monitoring the amount of fluctuation in the effective voltage value (Vmoni)
and effective current value (Imoni), detects chattering and other waveform
abnormalities resulting from the contact pin and sample in connection.
The judgment method is as follows: During analog measurement the Vmoni
and Imoni are operated several times. The first operated Vmoni and Imoni are
treated as the reference values and the

% value is calculated relative to the
subsequently operated Vmoni and Imoni using the following equation.

% = (effective value - reference value) / |reference value| ×100
If the

% value is greater than the set limit value it is detected as a contact
error.
•
Detect connection problems between the respective terminals
(H
CUR
, H
POT
, L
POT
, L
CUR
) and the object to be tested
(contact check function (only for 3504-60))
(p. 100)
Able to detect connection problems between the respective terminals (H
CUR
,
H
POT
, L
POT
, L
CUR
) and the object to be tested in all 4 terminal measurements.
6.3 Evaluate Contact Check Function