METREL MI 3295 - 7.2.3 Step Voltage and Contact;Touch Voltage Measurements

MI 3295 Step Contact Voltage Measuring System Measurements
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changing during the test the I
SET
parameter must be adjusted manually. The
measurement results cannot be corrected after the measurement.
7.2.3 Step voltage and Contact/Touch voltage measurements
While the Station injects the measuring current into earth the Step or Contact/Touch
voltage tests with the Meter can be carried out.
Figure 7.12: Step and Contact/Touch voltage screens
Test parameters for Step voltage and Contact/Touch voltage measurement
I flt
Maximum expected fault current ( 1 A ... 200 kA)
I set, I gen
Test current manually set (10 mA … 50 A ) or uploaded from Station
R inp
Input resistance (1 MΩ, 1 kΩ, 2 kΩ (with additional adapter A 1304))
U lim
Limit step voltage (25 V, 50 V)
Step or Contact/Touch voltage measurements
 Select STEP VOLT or U CONTACT/TOUCH function.
 Set test parameters / limits (optional).
 For Step voltage place the test electrodes (see chapter 7.1.3 Measurement for
more information).
 For Contact/Touch voltage place one test electrode and connect accessible metal
part (see chapter 7.1.3 Measurement for more information).
 Connect the test leads to the instrument.
 Press the TEST key to perform the measurement.
 Store the result by pressing the MEM key (optional).
Note:
 The measurements can be carried out without synchronization. In this case the
measuring current must be controlled and set / changed manually. The results
cannot be corrected after the measurement.
Connections for Step voltage and Contact/Touch voltage measurement
For connections see Figure 7.2 and Figure 7.3.
Figure 7.13: Examples of Step voltage and Contact/Touch voltage measurement results
Displayed results for Step voltage and Contact/Touch voltage measurements:
U ............. calculated Step or Contact/Touch voltage
Um...........measured Step or Contact/Touch voltage