Hioki ST5540, Инструкция по эксплуатации, Страница: 49 / 326

3.5 Pre-Test Inspection
43
3
Chapte
r 3 Setting Prep
arations
When network B2 is selected
The frequency range setting of the instrument is 0.1 - 1 MHz allowing the user to select 0.1 Hz - 1 MHz or
15 Hz - 1 MHz. An 0.1 Hz - 1 MHz setting will slow down the response of internal circuits and increase
measurement time. Therefore perform the following tests to check the frequency range setting when
using a B2 network. (Default setting: 15 Hz - 1 MHz)
Checking measurement frequency
(1) Press in the initial screen.
(2) Press .
(3) Press and set a frequency range setting of 0.1 Hz.
(Press to confirm and return to the system screen.)
(4) The appears when 0.1 Hz frequency range is set.
Press and adjust the value
(5) Measure the leakage current of the equipment under test
and record the measured value.
(Perform this measurement for 1 or 2 minutes.)
(6) When recording ends, perform operations in step (1) and (2)
again and press and set a frequency range setting of
15 Hz.
(7) Measure the leakage current of the equipment under test
and compare this value with the value obtained in the 0.1 Hz
- 1 MHz setting.
Unless the two values differ substantially, the customer's
equipment under test does not produce any leakage current
and the 15 Hz - 1 MHz setting is enough for any subsequent
measurement.
Check the frequency range setting at regular intervals.
• Use the 0.1 Hz setting only for measurements in the B2 network.
• Selecting a network other than the B2 network in an 0.1 Hz setting will invali-
date the 0.1 Hz setting. (The display does not change.)
• The auto range is not available when a 0.1 Hz frequency range setting is
made. Selecting auto range automatically sets the hold range. (during ACpeak
measurements: 1.000 mA range; during AC/DC/AC+DC measurements: 500.0

A range)
• Setting the frequency range to 0.1 Hz in voltmeter mode engages the hold
range (500.0 mV range).
• Setting the frequency range to 0.1 Hz when ACPeak is selected in leakage
current meter mode selects ACDC.
• The CAL key appears when 0.1 Hz frequency range is set.
See "Specific keys (not displayed for some measurement method)" (p. 29)