General Operating Rules - AEMC 6470 User Manual

4.3 General Operating Rules

NOTE: For detailed information regarding ground resistance testing, see the Un-
derstanding Ground Resistance Testing Workbook CD that was included with
the instrument.
Select the desired function using the main rotary switch.
There are 3 distinguished active states:
State 1: Before a functional measurement (e.g. after the power is turned
on, the switch position is changed, or when there is a modification to the
settings).
State 2: During a functional measurement.
State 3: After a functional measurement ends with results.
In State 1 the initial display state presents the main measurement parameters with
"---" bars instead of digits.
External voltages, when existing, are selected by the DISPLAY button.
The difference between State 1 and 3 are the available measurement results.
The length of the chain accessed by the DISPLAY button depends on the function
and the duration of the START/STOP button.
NOTE: In State 1 and 3, the Hz
If any result exists in State 3, it will be erased if modifications of the set-
tings are made. Press the MEM button to save the last test.
Therefore if there are modifications to a parameter made while in State 3, a push
on the Hz
occurs if the main rotary switch is moved.
Pressing the START/STOP button causes the instrument to enter State 2, starting
a new measurement.
In State 2 the frequency function of the Hz
a display of the actual frequency, which blinks, indicating that modifications are
possible. If a change is made to the used frequency by pushing the SELECT
button, the instrument changes to MANUAL mode for all Earth/Ground resistance
functions and accepts the manual selection of a frequency.
Identical to the AC resistance meaning of the Hz
sistance/Continuity Measurement in State 2, the Hz
change the polarity of the current.
In the AUTO mode, 3-Pole (3-Point) measurement selects the best frequency
and if a disturbance occurs, stops the measurement automatically. This means
that an FFT analysis of a disturbance voltage searches the best available test
frequency for a stable measurement. This automatic selected frequency is at least
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±20% out of the detected disturbance frequency value. If no suitable frequency
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button changes the instrument into State 1. The same result
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button is active.
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Ground Resistance Tester Model 6470
button is active. It provides
button in Bond Re-
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button causes to
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