46
Ground Resistance Tester Model 6471
Press the ► button to choose the following frequencies:
• USr, 55, 92, 110, 119, 128 Hz (128 Hz is default).
To change the user frequency (USr), press the ▲▼ buttons (▲▼ raises the value,
and
+ ▲▼ lowers it).
Table of possible USr frequencies (91 values from 41 to 513Hz):
41 43 46 49 50 55 60 61 64 67 69 73 79 82 85 92
98 101 110 119 122 128 134 137 146 159 165 171 183 195 201 220
238 244 256 269 275 293 317 330 342 366 391 403 439 476 488 513
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 128 Hz.
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 H S ES E blink (4-Pole measurement)
• 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.
6.3.1 Continuity Test
The 2-wire mΩ measurement gives a quick measurement result, accompanied by
an audible beep, during a continuity check.
The display is in the sensitivity range (0.5
Ω to 1.99kΩ) and the terminal check is
limited to terminal H (Z) (a cable must be connected to it), making it possible to
start the measurement with an open circuit.
For a continuity check, the following settings are mandatory:
• The 2-wire mΩ measurement function must be selected.
• The device must be in manual mode.
• The alarm function must be active (On).
• The alarm threshold must be low (<).
• The buzzer must be activated (bEEP On).
www.ShopAEMC.com
Shop for AEMC products online at:
1.888.610.7664
To Next Page
Loading...
