28
Ground Resistance Tester Model 6471
3.
The 6471 makes a measurement with a positive current (R+), then reverses the
direction of the current and makes another measurement with negative (R-).
R =
(R+) + (R-)
2
Ω
DC
ALARM
Ω
Ω
H
E
±
AUTO
Ω
DC
ALARM
Ω
Ω
H
E
±
AUTO
4.
To display the measurement parameters, press
DISPLAY
several times.
The device displays the following parameters:
R+, R-, +U
H-E
, +I
H-E
, -U
H-E
, -I
H-E
, U-Act (U
H-E
and its frequency) and R
∆0
if there
is compensation for the measurement leads.
5.2.1 Lead Compensation Measurement
Lead compensation subtracts the resistance of the test leads from the measured
result.
•
Short the two measurement leads connected to
H (Z)
and
E (X)
terminals.
•
Press the
2nd
button, then the
START/STOP
button to start the measure
-
ment.
•
This value will be deducted from all resistance values measured thereafter
until the rotary switch is turned to another function.
AUTO
0
R
Ω
DC
AC
ALARM
Ω
H
E
±
appears on the display after the compensation value has been measured.
NOTE:
If the compensation resistance is > 5
Ω
, or if the leads are not shorted
when the measurement is started, the value of compensation will be canceled.
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