Meco DIT 99 Instruction Manual

Digital Insulation Tester
Model : DIT 99

Instruction Manual

1

1.2 Electrical Specifications

Accuracies are ± (% reading plus number of digits at 23 ±
5 0 C, and humidity of less than 75% RH.
Model DIT99A DIT99B DIT99C DIT99D DIT99E
Rated Voltage 100V
Range 20MV
Resolution 0.01MV 0.1MV 0.1MV 0.1MV
Max. no load
voltage
Short circuit
current
Accuracy
3
®
250V 500V 1000V 1000V
200MV 200MV 200MV 2000MV
1MV
+25% of rated voltage
<2mA
± (3%rdg + 2dgt)

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 : "
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.
0
Operating conditions : 0 C to + 50
Storage conditions : -20 0 C to + 60
removed.
Accuracy : Accuracy specifications at 23 ± 5
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 50MV at 500V between
circuit and case.
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.
" is displayed when the battery
0
C 0-75% RH
0 C, 0-80% RH with battery
0
C,
2
4