Using Watt's Up
18
The following are some example
three-wire meter connections
. Many other arrangements and
uses are possible.
L o a d s
P o w e r S o u r c e s
L e g e n d
P l u g c o n n e c t o r
S o c k e t c o n n e c t o r
" T h r e e - W i r e " H o o k u p f o r
R e m o t e L o a d M e a s u r e m e n t
w i t h A u x i l i a r y P o w e r I n p u t
+
-
+
-
S
O
U
R
C
E
L
O
A
D
D C
I n v e r t e r
+
-
A C L o a d
" W a t t ' s U p " / D o c W a t t s o n
D C P o w e r A n a l y z e r
B a t t e r y
+
-
A u x i l i a r y
P o w e r
S h o w s o p t i o n a l a u x i l i a r y b a t t e r y c o n n e c t e d t o
a l l o w m e a s u r e m e n t b e l o w 4 v o l t s .
R e s e t s i g n a l c a n b e u s e d i n d e p e n d e n t l y o f
A u x i l i a r y p o w e r .
" T h r e e - W i r e " H o o k u p f o r
R e m o t e L o a d M e a s u r e m e n t
+
-
+
-
S
O
U
R
C
E
L
O
A
D
N o c o n n e c t i o n
P l u s c o n n e c t i o n t o
m e t e r c a n u s e l i g h t
g a g e w i r e a s o n l y
c a r r i e s c u r r e n t t o
p o w e r m e t e r
D C
I n v e r t e r
+
-
A C L o a d
" W a t t ' s U p " / D o c W a t t s o n
D C P o w e r A n a l y z e r
B a t t e r y
+
-
N e g a t i v e L e a d
C u r r e n t F l o w
O p t i o n a l , n o r m a l l y
c l o s e d , p u s h b u t t o n
s w i t c h t o r e s e t
m e t e r r e a d i n g s b y
r e m o v i n g p o w e r
© c o p y r i g h t 2 0 0 4 - 2 0 0 7 R C E l e c t r o n i c s , I n c . A l l r i g h t s r e s e r v e d
O p t i o n a l , n o r m a l l y
o p e n , s i n g l e p o l e ,
p u s h b u t t o n s w i t c h t o
r e s e t m e t e r r e a d i n g s
u s i n g t h e r e s e t s i g n a l
X
X
v 1 . 1
+
-
7.6
Increasing Transient Voltage Protection
The Watt's Up and Doc Wattson meters can be applied in a wide range of measurement
applications, some of which pose an increased risk of damage to the meter. This risk is due
to over voltage (from a variety of mechanisms) that exceeds the meter's rating and damages
internal components.
Providing sufficient built-in protection to survive any transient condition is both expensive,
can reduce performance and is generally unnecessary.
The following are three suggestions for external circuitry you can add to significantly
increase the meter's ability to survive damaging transients. These suggestions are
necessarily technical and intended for a technically savvy audience.
Sorry, but we can not
provide support for the suggestions in this section due to the potential complexities of
application and wide range of customer technical training and ability.
See diagram below to better understand the suggestion connections.
Three Suggestions:
"Watt's Up" & "Doc Wattson" Watt Meter and Power Analyzer User's Manual
RC Electronics, Inc.
