Megger INGVAR, User Manual

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38 ZP-BH05E BH0654BE
7 HOW TO USE INGVAR
7.8 Generating low
currents
If you want to improve the accuracy of current set-
tings, you can:
▪
Use a voltage that is as low as possible by (for example):
a) not connecting the Current Unit in series
b) Increase the impedance in the circuit, for instance use
longer, lighter-gauge (thinner) current cables.
7.9 Generating pulse trains
You can set INGVAR to generate a pulse-train (inter-
mittent current generation at regular intervals, i.e.
pulse-pause-pulse-pause etc.). This will continue until
you shut off generation, until a preset maximum time
(MAX TIME) is reached or until the condition at the
STOP INPUT is met.
1]
Basic settings:
OPERATE: OFF
2]
Set the desired current. See section 7.3 ”Set-
ting the desired current”.
3]
Press the
APPL
menu option.
4]
Turn the Select/set knob until ”PULSES” ap-
pears on the display.
5]
Press .
6]
Set the pulse duration "TIME ON" by turning
the
Select/set knob .
7]
Press .
TIME ON
< 1.000s T1 >
8]
Set the desired between-pulse pause "TIME
OFF" by turning the
Select/set knob.
9]
Press .
Note You can select the unit in which time is to
be expressed in the "SYSTEM" menu, option
"TIMER".
10]
Press
TIME
or
MOM
to start the test.
The word ”OPERATE” appears on the display
indicating that INGVAR is generating.
18.50s OPERATE
800A 5:OP
Note
The counter on the display (”:OP”) is intended
mainly for use when testing sectionalizers.
Each time the current is interrupted the coun-
ter value increases by one. The counter can
count up to 127 pulses.
11]
Generation stops:
You press
OFF
or
You release the
MOM
button
or
when the
AUTO OFF conditions are met