Valhalla 2300, Operation Manual

Page: 28 / 115

shunts are connected together to the
CURRENT COMMON - VOLTS HIGH
terminal. The 2300 measures the voltage
between the CURRENT COMMON -
VOLTS HIGH terminal and the VOLTS
COMMON terminal on all voltage ranges.
Connections to the 2300 vary widely and most
conceivable configurations are described in
the following paragraphs. The paragraph
numbers correspond to the Figure numbers at
the end of this section. The single-phase
connections are shown using channel C of the
2300. Any of the channels, A, B, or C may be
used for single phase measurements.
6-4-1. Single-Phase Two-Wire Load
Power Connections
Connect the wattmeter as shown in Figure 6-
1.
Caution! Do not run the neutral current
through the volts common terminal. Tap off
the neutral wire to connect the volts common
terminal.
6-4-2. Single-Phase Two-Wire CT Load
Power Connections
Connect the wattmeter as shown in Figure 6-
2. Observe the polarities of the current
transformer. The watts reading should be
multiplied by the CT ratio.
Caution! Do not
run the load current through the VOLTS
COMMON terminal. Tap off the neutral wire
to connect the VOLTS COMMON terminal.
6-4-3. Single-Phase Two-Wire PT Load
Power Connections
Connect the wattmeter as shown in Figure 6-
3. Observe the polarity of the potential
transformer. The watts reading should be
multiplied by the PT ratio.
Caution! Do not
exceed the common-mode rating of the Model
2300.
6-4-4. Single-Phase Two-Wire CT-PT
Load Power Connections
Connect the wattmeter as shown as Figure 6-
4. Observe the polarities of the current and
potential transformers. The watts reading
should be multiplied by the PT and CT ratios.
The current common terminal should be
grounded for best performance.
6-4-5. Single-Phase Two-Wire Source
Power Connections
Some applications require measuring the
power from a source rather than the power
into the load. These connections are shown in
Figure 6-5. When the model 2300 is
connected in this manner, the watts reading
should be multiplied by minus one (-1).
Caution! Do not run the neutral current
through the VOLTS COMMON terminal.
Tap off the neutral wire to connect the
VOLTS COMMON terminal.
6-4-6. Single-Phase Two-Wire CT Source
Power Connections
Some applications require measuring the
power from a source rather than the power
into the load. These connections are shown in
Figure 6-6. When the Model 2300 is
connected in this manner, the watts reading
should be multiplied by minus one (-1) and
the CT ratio. Observe the polarity of the
current transformer.
Caution! Do not run the
neutral current through the VOLTS
COMMON terminal. Tap off the neutral wire
to connect the VOLTS COMMON terminal.
6-4-7. Single-Phase Two-Wire PT Source
Power Connections
Some applications require measuring the
power from the source rather than the power
into the load. These connections are shown in
Figure 6-7. When the Model 2300 is
connected in this manner, the watts
reading should be multiplied by
minus one (-1) and the PT ratio.