User manual

ManualsBrandsGOSSEN METRAWATT ManualsTest EquipmentMetriso XTRA Insulation measuring device,

GMC-I Messtechnik GmbH 11

4 General Operation

4.1 Connecting the Instrument

The test leads are connected to the “+” and “COM” jacks.

Special Case:

Test Probe for Remote Triggering (Option Z550A)

When inserting

the 3-pole plug,

make sure that

the jack plug is

inserted in the

START/STOP

position. Press

and align the 3-

pole plug such

that it is placed

flush on the con-

nection terminal.

This is the only

way to assure

that the three

contacts of the

jack plug are

properly con-

nected with the command cables.

Special Case: Measuring High-Value Resistance with the KS-C Probe (Option)

When measuring

electrostatic dis-

charge capacity

for floor cover-

ings, the shielded

cable should be

connected to the

COM and SHIELD

jacks (KS-C

accessory set,

“cable set con-

sisting of mea-

surement cable

and high-resis-

tance measure-

ment cable for

measurements in the GΩ range”, see diagram). Be sure to

observe color coding.

4.2 Switching On, Monitoring and Switching Off

If supply voltage drops to a value of less than 8.5 V, the

LOW BATT pop-up message appears: No more measurements

can be started.

If battery voltage falls below the allowable limit value of 8.0 V, the

instrument cannot be switched on, or it is switched off.

Measurements cannot be started in the resistance measuring

ranges in the event of interference voltage.

The instrument only switches itself off automatically after comple-

tion of an (automatic) measuring sequence, and after the prede-

termined on-time has expired (see page 8). On-time is reset to its

original value as defined in the setup menu, as soon as any key or

the rotary function switch is activated.

If the instrument is switched off automatically with the rotary

switch in any position other than OFF, it can be reactivated by

pressing the ESC key. The instrument is also reactivated if the

rotary switch is activated and turned through the OFF position.

The instrument can be switched off manually by turning the rotary

switch to the OFF position.

4.3 Optical Indicators

Function testing should be executed at regular intervals (see following

section regarding testing the LEDs).

Testing the LED which Indicates Detection of Interference Voltage

when Switched Off – OFF Switch Position

➭ Apply a voltage of greater than 50 V (+ and COM jacks).

➭ Turn the rotary switch to the V position.

➭ Read the voltage value at the LCD.

➭ Turn the rotary switch to the OFF position.

Test results: If applied voltage is unchanged and the LED which

indicates the detection of interference voltage lights up red, the

LED is OK. In this case, the LED reliably indicates interference

voltage even when the instrument is switched off. We recom-

mend executing this test at regular intervals.

METRISO XTRA Measuring Functions, Measuring Ranges and

Limit Values

START/STOP SHIELD COM

Option Z550A

KS-C

(Z541F)

LED Status

Function – Cause

Limit Value Indication

– Measured insulation resistance does not violate the limit

value.

– Measured low-resistance Rlo does not violate the limit

value.

Limit Value Indication

– Measured insulation resistance has fallen short of the

selected limit value.

– Measured low-resistance Rlo does has exceeded the

permissible limit value.

Indication of ramp characteristics

– Maximum ramp voltage (upper voltage limit) has been

reached (without breakdown).

Indication of ramp characteristics

– Maximum ramp voltage (upper voltage limit) has not been

reached (due to breakdown).

Breakdown voltage is displayed.

Interference voltage in switched-off condition

and signal-

lings of test voltage during insulation measurement

Dangerous voltage of greater than 50 V is present at the mea-

surement inputs:

– Initialization of insulation resistance and

low-resistance measurement is disabled.

– High test voltage is applied to the measuring terminals

(Riso/Rins, PI and DAR) during insulation measurement

Detection of interference voltage in the on-state

in the resistance measuring ranges after starting measurement

The value of interference voltage is displayed in addition to signalling

in the resistance measuring ranges for as long as it is present.

Measuring Ranges

ISO

/ R

INS

U = 50, 100, 250, 500, 1000 V

ISO

/ R

INS

Uvar = 50 ... 1000 V

ISO

/ R

INS

Uramp (U ) = 100 ... 1000 V

R 10 ... 10 kΩ

0.01 ... 10 Ω

U 0 ... 1000 V

Limit Values

Limit R

ISO

/ R

INS

Fixed setting 50 kΩ @ U

ISO

INS

= 50 V

Fixed setting 100 kΩ @ U

ISO

INS

= 100 V

Fixed setting 500 kΩ @ U

ISO

INS

= 250 V

Fixed setting 1 MΩ @ U

ISO

INS

= 500 V

Fixed setting 1 MΩ @ U

ISO

INS

= 1000 V

Fixed setting 1 MΩ @ U

ISO

INS

= Uvar

PI limit Adjustable 1.0, 1.1, 1.5, 2.0, 3.0, 4.0

DAR limit Adjustable 1.25, 1.6

Limit R

Fixed setting 2 Ω

Limit

Green

Limit

Red

Uramp

Green

Uramp

Red

Limit