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Инструкция по эксплуатации Страница: 22

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Fluke 1621 — руководство по устранению неполадок для измерительных приборов [22/26]

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1621

Users Manual

Troubleshooting

To troubleshoot your Tester, follow the steps in Table 4.

Table 4. Troubleshooting

Step Description

1 Auxiliary electrode resistance (RH) too high

If the auxiliary electrode resistance is too high (exceeds 199 ke), it

is not possible to drive the current necessary for reliable

measurements. The measurement is blocked and the >LIMIT icon

displays.

Hint: Verify that the auxiliary electrode stake is firmly embedded in

the soil, and ensure that good connections exist between all

connection points, like test leads, connectors and alligator clips.

2 Probe resistance (RS) too high

If the probe resistance is too high (exceeds 199 ke), it is not

possible to make an accurate measurement. The measurement is

blocked and the >LIMIT icon displays.

Hint: Verify that the probe stake is firmly embedded in the soil, and

ensure that good connections exist between all connection points,

like test leads, connectors and alligator clips.

3 Is your resistance measurement performed with the specified

operating uncertainty?

If the probe resistance (R

) or auxiliary electrode resistance (R

) is

too high to perform a measurement with the specified operating

uncertainty, the flashing W is displayed additionally to the

measurement values.

Hint: Verify that the probe stake and the auxiliary electrode are

firmly embedded in the soil and ensure that good connections exist

between all connection points, such as test leads, connectors and

alligator clips.

4 Is your resistance measurement result reliable?

To ensure the most reliable resistance measurements, the probe

stake and auxiliary electrode stake must be outside the potential

gradient area of each other and the earth ground electrode. (Refer

to the “Addendum” for information regarding potential gradient

areas.)

The probe should be a minimum distance of 20 m (64 ft) from the

earth ground electrode, and the auxiliary electrode should be a

minimum distance of 20 m (64 ft) from the probe.

For some soil conditions, these distances may not be sufficient. To

be sure, take several measurements, increasing the distance with

each subsequent measurement until the measurements are

approximately the same.

5 Weak battery

If the battery is weak (<6.5 V), the supply voltage may break down

during measurement. LO-BAT icon displays.

Hint: Replace the battery. Use one 9 V alkaline (LR61) battery.

Fluke 1621 — руководство по устранению неполадок для измерительных приборов [22/26]

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