Replacing The Batteries; Input Terminals; Scale; Functional Description - Metrix MX 406B Manual De Instrucciones

Chapter II

2.1.2. Replacing the batteries

Unplug measurement circuit test cables, put the rotary switch to the off
!
position and remove test cables from the instruments.
Proceed as follows to replace the megohmmeter batteries :
1. Remove the four screws from the back of the instrument.
2. Remove the lower box.
3. Replace the batteries, taking care that they are in the right direction.
4. Close the instrument.
2.2.

Input terminals

Measurements are made with a specific probe (equipped with a push button) connected to
the input terminals through a grey cable and a tripod connector, and with a black cable and
a crocodile clip.
2.3.

Scale

The measurement readout is of the analog type. The megohmmeter 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)
- logarithmic scale for the 200 MΩ 500 V range (blue scale)
- logarithmic scale for the 200 MΩ 250 V range (blue scale)
- logarithmic scale for the 20 MΩ 50 V range (blue scale)
- logarithmic scale for the 10 Ω range (green scale)
- 400 V linear scale (red scale)
AC + DC
- +
- TEST scale containing 2 colors (red and green scale).
3.

FUNCTIONAL DESCRIPTION

As soon as the cables are connected to an AC voltage exceeding 100 V, an indicator
(located on the scale) lights up regardless of the switch position. For example, it may thus
indicate the presence of mains voltage.
3.1.

AC + DC voltage measurement

• Measurement range : 0 to 440 V
The instrument gives the value in TRMS, the probe push button is ineffective in this
function.
• Accuracy : ± 2.5 % (of full scale)
• Protection : 440 V
MX 406B
+ on the V position
AC DC
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