Seaward DO4000 User Manual

Page 12

Operating Instructions

Digital Ohmmeter DO4000 Series

Range Selection:
The 6 ranges may be selected manually by simply pressing the UP or DOWN keys.
The selected range will be indicated by an LED; over-range will be indicated by
the display reading - - - -.
Auto-Range can also be selected with the AUTO key; in this mode the 4000 will
automatically seek the best range to display the value.

Measurement Mode:
The measurement mode can be selected to measure with current in the forward
direction press +VE key, or pressing the AVE key can set the auto average mode.
The LED set in the key will indicate the mode set.

Selecting the average measurement mode automatically switches the current a
measurement is made in the forward and then the reverse direction and the
average of the two measurements displayed. This average mode ensures that any
errors due to thermal emf in the measurement circuit are eliminated. NOTE: The
average mode is not suitable for measurements on inductive circuits.

Error & Status Lamps
These LEDs are situated above the display and will light to indicate the instrument
status.

CAL

Calibration mode has been initialised. And the instrument is in
calibration mode.

Rx (4001 only) Indicates that the display is reading resistance in ohms
Rc (4001 only) Indicates that the display is reading the compensated resistance

value in ohms

T (4001 only)

Indicates that the display is reading Temperature in ºC

Display error messages

- - - -

Indicates that the measurement value is to high for the range
selected, Select a higher range.

Indicates that one of the measurement leads is open circuit.
Check the lead connections ensuring that they clean, free from
oxide and securely connected. This error message will also
appear if the Current lead resistance is too high.

Range

Maximum total lead resistance

40m

400m

400

4000

700

8000