Measurement Frequency Selection; Manual Settings For Mω Measurements - AEMC 6470-b User Manual

6.2 Measurement Frequency Selection

If there are signals with a frequency that could interfere with the chosen test fre-
quency, the NOISE symbol will appear.
While in MANUAL mode, change the frequency by pressing the Hz/OPTIONS
button until the frequency flashes.
Press the ► button to choose the following frequencies:
• USr, 55, 92, 110, 119, 128 Hz (128 Hz is default).
• 128, 1367, 1611, 1758 Hz for the 2-clamps function (1611 Hz is default).
To change the user frequency (USr), press the ▲▼ buttons (▲▼ raises the value,
and + ▲▼ lowers it).
Table of possible USr frequencies (48 values from 41 to 513Hz):
41 43
98 101
238 244
There are two user frequencies: one for resistivity and one for earth and soil po-
tential measurements. These two values remain in memory even after the device
is switched off.
For soil resistivity measurements, the user frequency is limited to 128Hz.
6.3 Manual Settings for mΩ Measurements
Pressing Hz/OPTIONS in MANUAL mode allows the following parameters to be
changed using the ► button:
• Terminal symbols H and E blink 
• POS on H and DC+ blinks  neg on H and DC- (reversal of polarity at terminal H)
In MANUAL mode the tester does not reverse polarity automatically during the
measurement; however, the polarity can be reversed during the measurement by
pressing the Hz/OPTIONS button.
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