10
Figure 4.1 Break-In Plug Connections, 150V, 3A and 300W Ranges
3.
Insert the Break-In Plug into 120V power outlet (in the AC line), or follow
procedures as given in paragraph 4.3 for 240V power.
4.
Plug the device to be checked into the Break-In Plug as shown in Figure 4-1.
5.
Press the AMPS pushbutton.
NOTE: Failure to fully depress the AMPS pushbutton may result in an erroneous
reading.
6.
Read the current value on the top arc of the scale. For the 3A range, use the
figures 0-300, and drop two zeros (divide by 100). Use the black digits to
indicate the decimal fraction. Repeat the procedure using the figures 0-150
for the 15A range (divide by 10). The first heavy line above zero represents
0.5A on the 3A range, and 2.5A on the 15A range.
7.
Special test leads can be substituted for the Break-In Plug when necessary
(paragraph 4.3). Open (break) the circuit to be measured and connect the
free ends of the test leads across the open circuit.
8.
Press the AMPS pushbutton to read the current.
9.
Restore the circuit continuity when test is complete.
10. To check the load on the entire line, remove the fuse from the fuse box, or
place the circuit breaker in the OFF position (depending upon the equipment
used).
15A
BREAK-IN
PLUG
WHITE
G
N
±
BLACK
RED
LOAD
0-3A
0-15A
V
3A
A
VOLTS
NORMAL
PRESS
FOR
MODEL 390 2
300W
3000W
150V
300V
1500W
600
W
0-300V
0-150V
BLACK
CABLE
LINE
±
N
±
±
VOL
TS-AMPERES
WATT
S
50
75
100
125
150
100
150
200
250
300
1000
500
200
100
2000
1000
400
200
3000
1500
600
300
0