METREL MI 3125 User Manual

MI 3125 EurotestCOMBO Maintenance
47
6 Maintenance
Unauthorized persons are not allowed to open the Instaltest Combo instrument. There
are no user replaceable components inside the instrument, except the battery and fuse
under rear cover.
6.1 Fuse replacement
There is a fuse under back cover of the Instaltest Combo instrument.
 F1
M 0.315 A / 250 V, 20×5 mm
This fuse protects internal circuitry for continuity functions if test probes are
connected to the mains supply voltage by mistake during measurement.
Warnings:
 Disconnect all measuring accessories and switch off the instrument
before opening battery / fuse compartment cover, hazardous voltage
inside!
 Replace blown fuse with original type only, otherwise the instrument may be
damaged and/or operator’s safety impaired!
Position of fuse can be seen in Figure 3.4 in chapter 3.3 Back panel.
6.2 Cleaning
No special maintenance is required for the housing. To clean the surface of the
instrument use a soft cloth slightly moistened with soapy water or alcohol. Then leave
the instrument to dry totally before use.
Warnings:
 Do not use liquids based on petrol or hydrocarbons!
 Do not spill cleaning liquid over the instrument!
6.3 Periodic calibration
It is essential that the test instrument is regularly calibrated in order that the technical
specification listed in this manual is guaranteed. We recommend an annual calibration.
Only an authorized technical person can do the calibration. Please contact your dealer
for further information.
6.4 Upgrading the instrument
The instrument can be upgraded from a PC via the RS232 communication port. This
enables to upgrade the instrument to the latest available software version. The upgrade
can be carried with help of a special upgrading software and the communication cable
as shown on Figure 6.14. Please contact your dealer for more information.

METREL MI 3125 Specifications

General

Type	Multifunction Installation Tester
Insulation Resistance	Yes
Continuity Test	Yes
Loop Impedance	Yes
RCD Testing	Yes
Voltage Measurement	Yes
Frequency Measurement	Yes
Display	LCD
Power Supply	6 x 1.5 V AA batteries
Loop Resistance Resolution	0.01 Ω
Frequency	45 - 65 Hz
Line Voltage Resolution	1 V
Insulation Resistance Test Voltage	50 V, 100 V, 250 V, 500 V, 1000 V
Insulation Resistance Resolution	0.01 MΩ
Continuity Resistance Resolution	0.01 Ω
Test Current	200 mA
DC Voltage	Up to 600 V
Loop Resistance	0.0 Ω - 1999 Ω
Line Voltage	Up to 550 V
Line Voltage Accuracy	±2% ±2 digits
Rated Residual Current	10 mA, 30 mA, 100 mA, 300 mA, 500 mA
Insulation Resistance Range	0.01 MΩ to 1 TΩ
Continuity Resistance	0.0 Ω - 1999 Ω
Dimensions	220 x 103 x 55 mm
Operating Temperature	-10°C to 50°C
Storage Temperature	-20°C to +60°C
Safety Standards	EN 61557
Loop Resistance Accuracy	±(5% + 3 digits)