AEMC 6471 - Appendix A: Glossary; Basic Terminologies

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
ashes
(3)
H
ashes
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 kΩ
ashes
(3)
S
ashes
f ≤ 513Hz All R
S
> 30 kΩ
4P sel I
ES
< 1 mA
ashes
(3)
ashes
All
Values measured (U,
I, R) unstable, varying
by more than 5% about
their mean values.
(2)
steady
(3)
ashes
R
PASS
I
ES
< 3 mA
I
SEL
< 30 mA
U
S-ES
< 10 mV
ashes
R
PASS
I
ES
< 0,3 mA
I
SEL
< 3 mA
U
S-ES
< 1 mV
-.--- (undened)
All U
S-ES
, U
S-E
, U
H-E
> 42 V
ashes
(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).
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