HP 4262A - Page 57

Section
IIT
Model
4262A
Table
3-4
Table 3-4. Unusual Operating Indications (Sheet 4 of 4).
Indication: Cause of trouble:
When a sample (for example, an iron core The measurement reading of sample
inductor)
is
measured
in
AUTO
of
CIRCUIT
depends
on
the
level
of
measurement
MODE,
the
instrument
repeats
range
test
signal
applied.
selection and does not complete the meas-
urement depending upon level of test current
used.
What to do:
Set LCR RANGE to MANUAL.
Manually settle the instrument on
an appropriate range.
Indication:
When a capacitor is measured with dc bias There are limitations to the permissible
voltage applied, an abnormal display occurs. insulation resistance of a capacitor
measured
with
dc
bias.
See
table
below.
MODE RANGE
IkH Cp 100. OpF 1000pF 10.00nF 100.0nF 1000nF
z
Cs 100.0nF 1000nF 10.00uF 100, 0uF 1000uF
Permissible
insulation 30MR 3000kQ 300k 30kS2 30009
resistance (Ri)
Note
In 120Hz(10kHz) measurement, multiply range value by 10(1/10),
Ri given in above table is applicable for a dc bias of 40V. When the
bias voltage is less than 40V, Ri limit is RiVb/40 () where Ri is
value given in the table and Vb is applied dc bias voltage.
3-26