45
4.3.3
MEASUREMENT & RESULTS
At the start of the measurement:
- the instrument measures U
S-E
and U
H-E
(and associated frequencies) : if U
S-E
and U
H-E
are
greater than 60V
peak
, the measurement is refused,
- the instrument checks the connections : if incorrect, the measurement is refused and the
faulty connection symbols flash.
- If a spurious voltage affects the accuracy of the measurement to be performed, the “NOISE”
symbol flashes.
During measurement :
- if a voltage > 60 V
peak
is detected, the measurement is stopped.
Note :
If the measurement is unstable or if the measurement results are inconsistent, trigger the
measurement again to check that the problem is not a faulty connection.
On completion of the measurement, the following quantities can be displayed using the
DISPLAY
SMOOTH
DISPLAY
DISPLAY
SMOOTH
key and saved using the
MEM
MR
MEM
MEM
MR
key:
If measurement is triggered by briefly
pressing START pushbutton
If measurement is triggered by pressing and
holding START pushbutton
R
E
, U
S-E
, I
H-E
U
OUT
, f
measurement
U
S-E
"NOISE"
(1)
and f, U
H-E
"NOISE"
(1)
and f
U
S-E
(2)
and f, U
H-E
(2)
and f
R
E
, R
H
, R
S
U
OUT
, f
measurement
U
S-E
, I
H-E
U
S-E
"NOISE"
(1)
and f , U
H-E
"NOISE"
(1)
and f
U
S-E
(2)
and f, U
H-E
(2)
and f
(1)
Accessible only if spurious voltages are present which have affected the accuracy of the
measurement (“NOISE” symbol on steady).
(2)
possible voltage present (post-measurement) across terminals.
4.3.4
CHARACTERISTICS :
Measurement method
EN61557-5
Open circuit voltage
16 or 32 V rms
Short-circuit current
>200mA
Maximum
acceptable
spurious voltage
60V
peak
Maximum
resistance
of
probe R
H
, R
S
100k
Ω
Measurement time
∼
7 s (if START button is pressed briefly)
∼
15 s (if START button is pressed and held)
Earth resistance R
E
Measurement range
0.01 –9.99
Ω
10.0 – 99.9
Ω
100 - 999
Ω
1.00 – 9.99k
Ω
10 – 99.9k
Ω
Resolution
0.01
Ω
0.1
Ω
1
Ω
10
Ω
100
Ω
Intrinsic error
± (2% + 1pt)