Meco DIT 99 Manuale utente
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®
Digital Insulation Tester
Model : DIT 99
Instruction Manual
1. SPECIFICATIONS
1.1 General Specifications
DispIay : 3½ digit liquid crystal display (LCD)
17mm height with a maximum reading
of 1999.
Overrange Indication : (1) or (-1) is displayed at MSD
Low battery : " " is displayed when the battery
voltage drops below the operating
voltage.
Safety standard : Meets the requirement of IEC 1010 for
insta1lation category II, 1000V phase to
earth.
Measurement rate : 2.5 measurements per second nominal.
Operating conditions : 00C to + 500C 0-75% RH
Storage conditions : -200C to + 600C, 0-80% RH with battery
removed.
Accuracy : Accuracy specifications at 23 ± 50C,
less than 75% RH.
Power Supply : 9 volts. 6 x 1.5V battery, Eveready
Dimensions : 144.5(H) x 95(W) x 56.5(D) mm.
Weight : 395 grams approx. including batteries
type 1015 or equivalent.
Accessories : Test leads (pair) 6 X 1.5V battery,
instruction manual, carrying case.
Dielectric Strength : 3.5kV @ 50Hz for 1 min.between Input
terminals and case
Insulation Resistance : More than 50MVat 500V between
circuit and case.
1.2 Electrical Specifications
Accuracies are ± (% reading plus number of digits at 23 ±
50C, and humidity of less than 75% RH.
Model DIT99A DIT99B DIT99C DIT99D DIT99E
Rated Voltage 100V 250V 500V 1000V 1000V
Range 20MV200MV200MV200MV2000MV
Resolution 0.01MV0.1MV0.1MV0.1MV1MV
Max. no load +25% of rated voltage
voltage
Short circuit <2mA
current
Accuracy ± (3%rdg + 2dgt)
2. SAFETY INFORMATlON
1. The circuit under test must be de energised and isolated before
connections ere made .
2. Circuit connections must not be touched during a test.
3. After Insulation tests capacitive circuits must be alIowed to be
discharged.
4. Test leads must be in good order, dean and have no cracked or
broken insuIation.
5.Do not push the test button before all connections and
preparations are done. The instrument must only be used by
suitably trained and competent persons.
Warning and safety symbols
Caution refer to this manual before using the meter.
Dangerous voltages.
Comply with lEC1010-1
3. OPERATION
Before taking any measurements, read the safety Information
section.Always examine the instrument for demage, contamination
(excessive dirt, grease, etc.) end defects Examine the teat leads for
cracked or frayed Insulation.If any abnormal conditions exist do not
make any measurements.
3.1 PRECAUTIONS
1. Disconnect aIl power from the circuit under test when making
measurements. If any voltage is present in the test circuit an
erroneous reading will result.
2. When the test switch la pressed a high voltage Is generated
between ‘+’ and ‘-’ terminals. Do not touch any live parts In the
circuit during measurement.
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3.2 INSULATION RESISTANCE MEASUREMENT
1. Connect red test lead to ‘+’ terminal
2. Connect black test lead to ‘-’ terminal
3. Short the red and black lest lead and press the test switch,
Zero MA should be indicated on the display.
4.Connect the test Ieads to circuit under test and press test
switch.
5. Display indicates the reading in MV, lf insulation resistance is
higher than the range of the instrument, ‘1’ or ‘-1’ is indicated.
4. MAINTENANCE
If there appears to be a malfunction during the operation of the
meter. the following steps should be performed in order to isolate
the cause of the problem;
1. Check the battery.
2.Review the operating instructions for possible mistakes in
operating procedure.
3. Inspect and test the Test Probes for a broken or intermittent
connection.
4.1 BATTERY REPLACEMENT
To prevent electrical shock hazard, disconnect the test leads before
removing the battery cover. Also ensure that the test switch is not
pressed.
1. Remove the cover of battery case at the rear
2. Remove the old batteries from the meter and replace with new
batteries. Replace all the batteries at the same time.
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NOTE
SR. NO. :
CHECKED BY :
DATE :
MODEL NO. :
®
Certificate of Calibration
We hereby certify that this product has been
calibrated and found to be in accordance
with the applicable SPECIFICATIONS and
STANDARDS.
Accuracies of the standard equipment used in
this calibration are traceable to the National
Standards.
Plot No. EL-1, MIDC Electronic Zone,
TTC Industrial Area, Mahape,
Navi Mumbai - 400710 (INDIA)
Tel : 0091-22-27673311-16, 27673300 (Board)
Fax : 0091-22-27673310, 27673330
Web : www.mecoinst.com
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