Metrix MX 604 Notice De Fonctionnement page 15

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Chapter II
2.2. Scale
The measurement readout is of the analog type. The discharger tester is fitted with a
graduated scale and a needle.
The scale is graduated to give a direct reading without any multiplication factor (logarithmic
graduation). The scale length is 79 mm (circular arc according to IEC standard 51) :
- discharger tester scale graduated from 0 V to 600 V
- logarithmic scale for the 2000 MΩ 500 V range (blue scale)
- logarithmic scale for the 200 MΩ 100 V range (blue scale)
- logarithmic scale for the 20 MΩ 50 V range (blue scale)
- +
- TEST scale containing 2 colors (white and red scale)
2.3. Input terminals
Measurements are performed :
•
either with a specific probe (equipped with a push button) connected to the input
terminals through a grey cable and a tripod connector, together with a black lead with a
probe tip or an alligator clip
•
or with a discharger support unit equipped with 4 male plugs to be connected to the 4
input terminals of the instrument box.
2.3.1. Discharger support unit
This unit is a moulded box with 4 male plugs to be connected to the discharger tester.
On the front face of the unit is to be found :
• 2 recesses to accomodate two different discharger types
• a sliding switch used to select one of the two arresters (twin type) when the
test is carried out,
• a push button to launch the measurement.
2.3.2. Probe
The probe allows measurement to be triggered directly from the probe tips by means of a
push button. The probe comprises three parts:
1. a probe tip with :
• a test probe of 4 mm diameter and 18 mm length
• a push button for initiating external surge arrester tests or insulating resistance
tests
2. a cable with 3 wires (∅ 0.5 mm each) of 1.5 mm length
3. a tripod plug which is connected to the measurement instrument.
This plug is fitted with a failsafe device to prevent connection errors.
Discharger tester
(black scale)
DC
11