Arbiter Systems Portable Power Sentinel 933A, Руководство по эксплуатации

Страница: 37 / 191

2.3.4 Voltage Inputs, 650 Vrms
Four input connectors are available for measuring AC voltages. All four of
the inputs use identical circuitry, which allow for measurement of voltages
up to 650 Vrms between inputs. See Figure 2.3 below.
Safety-insulated banana jacks are used to connect voltage signals to
the 933A, are labeled “A”, “B”, “C”, “N” (for phase A, phase B, phase
C and Neutral, respectively), and have one megohm voltage dividers tied
to a common point. Any unused voltage input will float at the average
value of the used inputs. You can measure voltage between any two of the
inputs (e.g., A and N, or A and B), including any input and a synthesized
neutral. Synthesized neutral is the average of the voltages at inputs A, B,
and C. The 933 does not directly measure Vac or Vbc.
2.3.5 Current Input Module, 20 Arms (933A-01)
The Model 933A-01 Current Module has three inputs, A, B and C, for use
in AC current measurement. Each of the inputs uses a pair of five-way
binding posts, and has a maximum continuous current capability of 20
amps rms. Peak current is 40 Arms, maximum. See Figure 2.3 below.
For information on alternate plug-in modules (933A-02 and 933A-03) that
offer lower current ranges and different connector styles, see Section 1.4.12.
Optional modules provide connectors for measuring neutral current.
1
m
N
O
9
3
3
A
-0
–
2
0
A
r
s
D
IR
E
C
T
I
N
P
U
T
C
U
R
R
E
T
M
D
U
L
E
A
B
C
2
r
s
M
A
.
0
A
m
X
R
A
B
IT
E
R
SY
ST
E
M
S
R
A
B
IT
E
R
SY
ST
E
M
S
VOLTAGE INPUTS
A B C N
650Vrms Max.
C-Phase
Current Terminals
B-Phase
Current Terminals
A-Phase
Current Terminals
Voltage Inputs: A, B, C and Neutral
Figure 2.3: Voltage and Current Inputs
19