11
Figure 4.2 Model 390-2 and Special Test Lead Set Application
11. Connect the Model 390-2 as an ammeter in series with the line and the load
using the Special Test Lead Set, or as a wattmeter (see Figure 4-2).
12. To extend the current range of the Model 390-2 use a current transformer. A
current transformer with a ratio of 10 to 1, when used with the 3 ampere
range, will permit a reading of 30 amperes. Multiply the readings on the 3A
range by 10. Current transformers with other ratios may be used in the same
way if the scale readings are multiplied by the ratio of the transformer.
4.7
AC Watts 0-300, 0-1500, Using Break-In Plug
(Line Voltage 0-150)
1.
Connect the leads from the Break-In Plug according to their color as shown
in Figure 4-1.
NOTE: When the red lead is connected to the 3A terminal and the white lead is
connected to the 150V terminal as shown, the connecting line on the panel
between the 150V and 3A terminals indicates that the 300 watt range is being
used. When the red lead is connected to the 15A terminal, the range is 1500
watts, as indicated by the line on the panel between the 150V and 15A terminals.
2.
Insert the Break-In Plug into an AC outlet.
3.
Plug the device to be checked into the Break-In Plug as shown in Figure 4-1.
4.
Press the WATTS pushbutton all the way down.
15A
6V
3A
6A
VOLTS
NORMAL
PRESS
FOR
MODEL 390 2
300W
3000W
150V
300V
1500W
600W
VOL
TS-AMPERES
WATT
S
50
75
100
125
15
0
10
0
150
200
250
300
1000
500
200
100
2000
1000
400
200
30
00
15
00
60
0
30
0
0
LOAD
SOURCE