−39−
⑤Read the value on the display.
⑥After measurement, remove the red and black test pins from
the circuit measured.
⑦Turn the function switch to the position of OFF.
●If the display will not change when an input signal is applied
(measurement is not possible), a probable cause is a blown fuse.
●Since this instrument employs the means value system for its
AC voltage measurement circuit, AC waveform other than sine
wave may cause error.
5-7-2
Current Measurement (A) Maximum rating input value DC/AC 20 A
1. Never apply voltage to the input terminals.
2.Finish measurement within 10 seconds to prevent heat
generation.
3. Provide intervals 5 minutes or longer between measurements
to prevent heat generation. (Continuous measurement:max 5 A)
4. Perform measurement with the leads kept straight to prevent
overheat.
WARNING
1) Applications
Current in DC and AC circuit is measured.
2) Measuring ranges
DCA: 4･20 A (2 ranges), ACA: 4･20 A (2 ranges)
3) Measurement procedure (See Fig 13, page 16)
①Slide the safety cover of the CD731a to the left and insert the
red plug of the test leads to the 4･20 A measuring terminal and
the black plug to the COM (−) terminal.
②Set the function switch at "4･20 A / 〜" function.
③Select the select switch at " " (DC) or "〜" (AC).
④Apply the black test pin to the negative potential side of the
circuit to measure and the red test pin to the positive potential
side.
⑤Read the value on the display.
⑥After measurement, remove the red and black test pins from
the circuit measured.
⑦Turn the function switch to the position of OFF.
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