Vanguard Auto-Ohm - Manual (Page 13)

Auto-Ohm Operating Procedures
9
a. This screen prompts the user to select the
desired test current. Test current options are:
10, 25, 50, 100, CUSTOM, and ABORT
TEST. If any of the 10 through 100 amperes
options is the choice, turn the control knob
until that current level displays, then press
the knob to enter that choice (in which case
go to step d). If a smaller increment of
current is desired, select CUSTOM (figure
6) and press the control knob and go to the
next step. The SET CUSTOM CURRENT
menu is show in Figure 7.
Figure 6. Select Custom Current Menu
b. This menu allows the user to select any
test current from 10 to 100 amperes
Figure 7. Custom Current Menu
c. Custom current is defaulted for 50AMPS
(mid point) in this menu. Turn the control
knob until the current of choice displays;
then press the control knob to set the desired
current. The display will now show the
BURN IN TIME menu (Figure 8).
NOTE
Selecting ABORT TEST causes the display
to return to the Main Menu.
Figure 8. Burn-In Time Menu
d. This menu selects the amount of time the
burn-in current will be run through the test
load just before its resistance is measured.
Burn-in time range is from 5 to 60 seconds
(in 5-second steps). The default burn-in time
is set for 5 seconds. Turn the control knob
until the desired burn-in time appears in the
display, then press the control knob to enter
that time. Go to the next step.
Figure 9. Test Current & Burn-In Time
e. This display (above) shows the current
and time that have been selected. If these are
as the user intended, then press the control
knob to accept the selections and begin the
burn-in and measurement sequence. Go to
the next step.
Figure 10. Current Ramp Menu
f. This display (above) shows the current
ramp percentage (of the test-level current).
The Auto-Ohm will ramp test current from 0
(zero) amperes to the desired test current
level in 3 seconds. The test current is
gradually ramped up and down (an
automatic function), which virtually
eliminates magnetically induced transients
through the circuit breaker current
transformers. When ramp stabilizes at
100%, the next display appears
automatically.
Figure 11. Burn-In Menu
g. This display shows the resistance reading
and the remaining burn-in time of the test.
SELECT TEST CUR
BURN IN TIME
<5 SEC>
50 AMPS 5 SEC
“PRESS” TO RUN
CUR RAMP: 20%
SELECT TEST CUR
<50 AMPS>
BURNING IN: 02
120.1 MICRO-OHM