Seaward DO5000 Series - Manual (Page 30)

Operating Instructions Microhmmeter Type DO5000
25
5.7 Measurement of Inductive Devices
GENERAL
When the Settling algorithm is selected, and the ‘MEAS’ button pressed, continuous
measurements will be made until two consecutive results are within the selected limit, or until
the selected maximum number of measurements has been reached. In the first case, the final
result will be displayed, and in the second case, the message: “MEASURMENT ERROR –
Failed to Settle” will be displayed. If appropriate, the result (or the ‘error value’) will also be
datalogged, sent out on the bus, and sent to the Analogue Output on the PLC card. Finally, if
the Measurement Limits facility is selected, then the PASS/FAIL result will be displayed.
The Settling facility can be used in ‘SLOW’ mode only.
Normally, the Settling facility should be used in ‘SINGLE’ trigger mode, and the above
description assumes this. However, if ‘CONTINUOUS’ trigger mode is used, then the operation
is the same, except that once the measurement has settled, the settling facility is effectively
disabled, and the DO5000 continues to take measurements without interrupting the current,
until ‘STOP’ is pressed. When ‘MEAS’ is pressed again, the Settling facility will be re-engaged.
MENU ACCESS
The menu is accessed by pressing ‘MODE’, followed by ‘Sett’. From this point, the following
parameters can be set:
On/Off: Selects/Deselects the Settling Algorithm
No. Rdgs: Selects the maximum number of readings to be taken (2 – 999).
This will give a maximum measurement time of approximately 8 minutes.
Limit: Selects the maximum number of display digits by which the two consecutive
readings may differ, for the measurement to be defined as ‘settled’ (1 – 999).
When the facility is selected, the word ‘Sett:xxx’ will appear in the top right corner of the
screen. ‘xxx’ shows the maximum number of readings to be taken, but during a measurement,
it counts the number of readings taken when the measurement settled. (‘Sett:’ will flash during
measurement.)
Note that if ‘CONTINUOUS’ trigger mode is used, then the counter will freeze at the number
when the measurement settled, even though measurements will continue.
EFFECT ON OTHER PARAMETERS
• Selecting the Settling facility will:
• Cause the Autorange to change range in a downward direction only.
(Therefore, only ‘Auto1’ autorange mode should normally be used.)
• Deselect the Filter facility.
• Change Average current mode to Positive current mode.
• Cause an error message if in Fast mode.
PARAMETERS WHICH WILL DESELECT THE SETTLING FACILITY
• The Settling facility will be deselected if:
• Filter facility is selected.
• Average current mode is selected.
• Fast mode is selected.
REMOTE COMMANDS
See attached extract from the Remote Interface Manual for details, and an example
programme.