HT instruments HT7052 - Manual (Page 27)

HT7052
EN - 25
6.7 INSULATION RESISTANCE WITH STEP VOLTAGE TEST
6.7.1 Setting of parameters
1. Switch on the instrument by pressing the ON/OFF key
2. Select with arrow keys  or  the item “STEP VOLTAGE” on main menu and confirm
with SELECT key. The screen of Fig. 34 is shown by the meter. In case of activation of
Graphic R(t) option press arrow keys  or  to select the graphical screen of Fig. 35
Fig. 34: Initial numerical screen Fig. 35: Initial graphical screen
3. Press again the SELECT key to enter in the setup parameters section. The screen of
Fig. 36 is shown by the meter
4. Use the arrow keys  or  for the selection of parameters. The herewith Table 7
shows the meaning of the measurement parameters
5. Set the values by using the arrow keys  or . Press SELECT key to select possible
sub-parameters and repeat the settings
6. To activate the graphical screen the parameter Graph R(t) should be ON and the Timer
must be activated (see Fig. 36). The time duration of graphical function is
correspondent to the value of Step Timer multiplied by 5
7. The Timer value could be very long (up to 150 minutes), so the special automatic
decimation algorithm (LOG) is use to write the Graph R(t) at display (see Fig. 37)
8. The cursors of the Graph R(t) could be activated with  key at the end of
measurement. The cursors of the Graph R(t) could be moved with  or  keys
9. Press ESC key to save the settings and back to the measurement screen or the
START/STOP key to exit from the settings menu and activate the test
Parameter Description
Unominal Set test voltage – Range 2kV 10kV step 125V
Step time Duration of measurement per step
Graph R(t) Enable/Disable Graph R(t)
R(t)
Set of minimum and maximum values of R(t) for graphical
screen
R(t) Type Set of “LIN” (linear) o “LOG” algorithm of graphical screen
Table 7: Setting of internal parameters
Fig. 36: Setting parameters Fig. 37: Setting of graph R(t) parameters