5.2.2 Continuous measurement for a pre-selectable time :
In normal course, the insulation test terminates when the test key
is released and the measured insulation resistance value remains
on display
for few seconds
after the test key
is released.
With
the
Pre-selectable
measurement
time
feature,
the
insulation test continues for the pre-determined time.
Pre-selectable time : 10 sec-5 min
Refer to the “11. Menu structure” section for how to set the value for pre-
selectable time. Once the time is set it is applicable to all the 5 ranges of
Insulation measurement.
n
Select the required value of the time for which the test is
to be carried out.
n
Briefly Press the TEST key.
The insulation resistance
test carries on for the time interval selected.
n
The test terminates automatically after the selected time
has elapsed.
n
The display then flashes the value of measurement at
the end until the Key is pressed.
5.3 Conclusion of measurement and discharging
After the measurement has been completed, any residual voltage is
displayed which may be caused by capacitive circuits. Contact with the
device under test must be maintained.The reduction in voltage can be
directly observed at the LCD.
Do not disconnect the device under test until voltage has dropped
below 25 volts !!
Note : Automatic discharge !
The capacitive circuits are automatically discharged when
TEST button is released following an insulation resistance test.
This auto discharge facility eliminates the need for the user to
discharge the circuit under test manually.
Additional features available in Insulation measurement ranges.
1.
Pre-selectable limit checks (Go/Nogo option)
2.
Storing the measured resistance value
3.
Minimum and Maximum value “MIN/MAX” storage
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10
6 Additional Features
6.1
Pre-selectable limit checks (Go/No-Go option)
An acoustic signal can be generated when the measured value of
resistance falls below an adjustable noGo value.
A separate noGo value can be set for each range of insulation
resistance measurement as well as for Ohms, Continuity ranges.
Refer to the “11. Menu structure” section for how to set the value
for the noGo value.
6.2
Storing the measured resistance value
l
To store the value of resistance press “STORE” key when the
resistance measurement is in progress. This will store the
resistance measured at the instant the key is pressed.
l
This way maximum 10 readings per range can be stored.
th
l
After 10 values are stored for the selected range the 11
value
when stored will over-write the first value i.e. at any given point
of time only ten readings per range can be stored.
l
The readings are stored in a volatile memory.Therefore when the
instrument is switched off, the readings are lost.
Recalling the stored values
The stored values can be recalled and viewed in the menu
structure.
Refer to the “11.Menu Structure” section for how to view the
stored value.
6.3
Minimum value and Maximum value “MIN/MAX” storage
facility (for all measuring ranges)
With the MIN/MAX function, you can hold the minimum and the
maximum measured value which was applied to the input of the
instrument after activating MIN/MAX.The most important application is
determination of minimum and the maximum value for long term
monitoring of measured quantities.
The function MIN/MAX can be activated in all measuring ranges.
MIN/MAX does not influence analog indication, you can still read the
actual measured value.
Apply the measured quantity to instrument prior to activating MIN/MAX
function.
The MIN/MAX function is switched off when.
1.
Key is pressed for approximately for 1 Sec. OR
2. Then function selector switch is operated OR
3. When the instrument is turned OFF and ON again
Function
MIN/MAX
Measured Value
MIN and MAX
Meter reaction
Display
Measured value DigitalMIN/MAX
Sound
signal
1. Activate
and store
2. Store
and display
3. Return
to 1.
Reset
short
short
short
short
long
Stored
Stored continued
in background
new MIN and MAX
values are displayed
Same as 1.
Stored values are
not cleared
Cleared
Actual measured value
Stored MIN value
Stored MAX value
Same as 1.
Cleared
MIN/MAX
flash
MIN flash
MAX flash
Same as 1.
Cleared
1x
1x
1x
1x
2x
