Ground Resistance Tester Model 6471
77
Conditions that may give uncertain results are indicated on the display of the unit
as follows:
Frequency
Function
Triggering threshold
Indication on the
display unit
f > 513Hz
3P, 4P, V pot.
I
H-E
< 6 mA
flashes
(3)
H
flashes
4Psel
I
H-E
’ < 6 mA
(1)
f
≤
513Hz
3P, 4P,
ρ
, V pot
I
H-E
< 1 mA
4Psel
I
H-E
’ < 1 mA
(1)
f > 513Hz
All (except
ρ
and 2
clamps)
R
S
> 5 k
Ω
flashes
(3)
S
flashes
f
≤
513Hz
All
R
S
> 30 k
Ω
4P sel
I
ES
< 1 mA
flashes
(3)
flashes
All
Values measured (U,
I, R) unstable, varying
by more than 5% about
their mean values.
(2)
steady
(3)
flashes
R
PASS
I
ES
< 3 mA
I
SEL
< 30 mA
U
S-ES
< 10 mV
flashes
R
PASS
I
ES
< 0,3 mA
I
SEL
< 3 mA
U
S-ES
< 1 mV
-.--- (undefined)
All
U
S-ES
, U
S-E
, U
H-E
> 42 V
flashes
(3)
All
Stray voltage of which
the frequency and/or
value is likely to inter
-
fere with the measure
-
ment.
NOISE
(4)
(1) I
H-E
’: current I
H-E
measured at the start of the measurement before I
SEL
.
(2) Not active if the SMOOTH function is selected.
(3) The
symbol may also appear if there is an external voltage > 42 V on the terminals of the device.
(4) You should change to manual mode and modify the measurement voltage and/or frequency to make
a valid measurement (when the NOISE symbol is no longer illuminated).
www.
ShopAEMC
.com
Shop for AEMC products online at:
1.888.610.7664
