KYORITSU 4120A - Manual (Page 10)

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5. OPERATING INSTRUCTIONS
5.1 Initial Checks - To be carried out before any testing.
(1) Test Lead Connection
Insert the lead plug into the connector on the instrument correctly as
shown below.
(2) Wiring Check
Before pressing the "Test Button" always check the LED's for the
following sequence:
P-E Green LED must be ON
P-N Green LED must be ON
Red LED must be OFF
CAUTION
● Always inspect your test instrument and lead accessories for
abnormality or damage. If abnormal conditions exist DO NOT
PROCEED WITH TESTING.
Lead Plug
Fig. 5
● Operating Error of Loop Impedance (61557-3)
Range
20Ω
200Ω
2000Ω
Measuring range to keep
operating error
0.20 ∼ 19.99Ω
20.0 ∼ 199.9Ω
200 ∼ 1999Ω
Maximum percentage
operating error
±30%
The influencing variations used for calculating the operating error are
denoted as follows:
Temperature：0℃ and 40℃
Phase angle ：At a phase angle 0゜to 18゜
System frequency：49.5Hz to 50.5Hz
System voltage：230V+10%-15%