Seaward DO4000 - Manual (Page 16)

Operating Instructions Digital Ohmmeter DO4000 Series
14
Measuring Inductive Circuits When measuring inductive circuits such as motor
winding or transformers it is important to set the DO4000 / DO4001 / DO4002 in
the following mode:
Auto range off
Auto average off
Continuous measurement on
To select the range use the _ up _ down keys.
To select Auto average off press AVE key. LED SHOULD NOT BE LIT.
For continuous measurement press and hold down the MEAS key until a
continuous bleep is heard.
Failure to set the above will result in unstable or incorrect measurements.
12. Protection
Every effort has been made to protect the instrument against voltages being applied
to the terminals. A large 1Amp fuse is fitted internally to the +I measuring line.
The fuse fitted will interrupt up to 40,000 Amps. The P terminals are not fused and
will withstand up to 460 Volts without damage to the instrument.
WARNING!
To replace the protection fuse, the rear instrument cover should be removed. The
protection fuse is located on the main printed circuit board. Only replace with the
correct fuse rating. Ensure that all measuring leads are disconnected before
opening
13. Temperature Compensation (Model 4001 Only)
Automatic temperature compensation is available on the model 4001, a Pt100
temperature sensor should be connected to the DIN socket next to the measuring
terminals.
To activate this function press the DISP key the Rc LED will light to show that the
displayed value is the compensated resistance. The Pt100 sensor will measure the
ambient temperature and compensate the reading for the temperature coefficient of
the measured Rx.
Different temperature coefficients may be selected by pressing the COMP key,
Copper and Aluminium Coefficients are pre set and a user coefficient may also be
entered, repeated pressing of the COMP key toggles around these options. To set
the user coefficients the arrow keys are used select the digit and increment or
decrement the digit.
14. Temperature Measurement (Model 4001 Only)
The model 4001 can also be used as thermometer using a Pt100 temperature
probe inserted into the socket next to the measuring terminals. Press the DISP key
until the T Led lights the 4001 will now display the temperature measured by the
Pt100 sensor.
Measuring Range -50ºC...+800ºC Resolution 0.1ºC