Manual Gossen Metrawatt PROFITEST MXTRA (page 45 of 96) (English)

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GMC-I Messtechnik GmbH 45

• After briefly pressing the ON/START key, specified test voltage

UN is read out and insulation resistance RISO is measured. As

soon as the measured value is stable (settling time may be

several seconds in the case of high cable capacitance values),

measurement is ended and the last measured values for RISO

and UISO are displayed. U is the voltage which is measured at

the test probes during and after testing. This voltage drops to a

value of less than 10 V after measurement (see section enti-

tled “Discharging the Device Under Test”).

• As long as you press and hold the ON/START key, test voltage

UN is applied and insulation resistance R

ISO

is measured. Do

not release the key until the measured value has settled in

(settling time may be several seconds in the case of high cable

capacitance values). Voltage U, which is measured during

testing, corresponds to voltage UISO. After releasing the ON/

START key, measurement is ended and the last measured

values for R

ISO

and U

ISO

are displayed. U drops to a value of

less than 10 V after measurement (see section entitled “Dis-

charging the Device Under Test”).

q Pole Selection Report Entry

The poles between which testing takes place can only be entered

here for reporting purposes. The entry itself has no influence on

the actual polarity of the test probes or pole selection.

q Limits – Setting the Limit Value

The limit value for insulation resistance can be set as desired. If

measurement values occur which are below this limit value, the

red U

LED lights up. A selection of limit values ranging from

0.5 to 10 M is available. The limit value is displayed above the

measured value.

Start Measurement – Rising Test Voltage (ramp function)

Press briefly:

Quick polarity reversal if parameter is set to AUTO: 01/10 ... 10/10: L1-PE

... L1-L3

Note

If “semiautomatic polarity reversal” is selected (see sec-

tion 5.8), the corresponding icon is displayed instead of

the ramp.

General Notes Regarding Insulation Measurements with Ramp

Function

Insulation measurement with ramp function serves the following

purposes:

• Detect weak points in the test object’s insulation

• Determine tripping voltage of voltage limiting components and

test them for correct functioning These components may

include, for example, varistors, overvoltage limiters (e.g.

DEHNguard® from Dehn+Söhne) and spark gaps.

The test instrument uses continuously rising test voltage for this

measuring function, up to the maximum selected voltage limit.

The measuring procedure is started by pressing the START/

STOPP key and runs automatically until one of the following

events occurs:

• The selected voltage limit is reached

• The selected current limit is reached

• Sparkover occurs (spark gaps)

Differentiation is made amongst the following three procedures for

insulation measurement with ramp function:

Testing of overvoltage limiters or varistors

and determining their tripping voltage:

– Select maximum voltage such that the anticipated breakdown

voltage of the device under test is roughly one third of this

value (observe manufacturer’s data sheet if applicable).

– Select current limit value in accordance with actual require-

ments or the manufacturer’s data sheet (characteristic curve

of the device under test).

Determining tripping voltage for spark gaps:

– Select maximum voltage such that the anticipated breakdown

voltage of the device under test is roughly one third of this

value (observe manufacturer’s data sheet if applicable).

– Select the current limit value in accordance with actual

requirements within a range of 5 to 10 A (response charac-

teristics are too unstable with larger current limit values, which

may result in faulty measurement results).

Detecting weak points in the insulation:

– Select maximum voltage such that it does not exceed the test

object’s permissible insulation voltage; it can be assumed that

an insulation fault will occur even with a significantly lower

voltage if an accordingly lower maximum voltage value is

selected (nevertheless at least greater than anticipated break-

down voltage) – the ramp is less steep as a result (increased

measuring accuracy).

– Select the limit current value in accordance with actual

requirements within a range of 5 to 10 A (see also settings

for spark gaps).

Start Measurement – Constant Test Voltage

Long-term measurements

Press and hold:

Quick polarity reversal if parameter is set to AUTO: 01/10 ... 10/10:

L1-PE ... L1-L3

Note

The instrument’s batteries are rapidly depleted during the

insulation resistance measurement. When using the

“constant test voltage” function, only press and hold the

Start t key until the display has become stable (if long-

term measurement is required).

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