— 10 —
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 Instrumental Uncertainty of Loop Impedance (61557-3)
Range
20 Ω
200 Ω
2000 Ω
Measuring range to keep
operating error
0.35 〜 19.99 Ω
20.0 〜 199.9 Ω
200 〜 1999 Ω
Maximum percentage operating
instrumental uncertainty
± 30%
The influencing variations used for calculating the operating
instrumental uncertainty 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%
Harmonics :
5% of 3rd harmonic at 0°phase angle
6% of 5th harmonic at 180°
phase angle
5% of 7th harmonic at 0°
phase angle
D.C quantity : 0.5% of the nominal voltage
