Arbiter Systems 1040C User manual

PD0010800A 9-92
CALIBRATING METERS AND TRANSDUCERS
WITH THE MODEL 1040C
PANEL METER CALIBRATOR
ARBITER SYSTEMS, INC.
1324 VENDELS CIRCLE, SUITE 121
PASO ROBLES, CA 93446
[phone] FAX [phone] PD0010800A 9-92

ii
Introduction ............................................................................................................... 1
Using the 1040C for Calibrating Single Phase Devices............................................ 2
A.C. Voltage.................................................................................................. 2
A.C. Current .................................................................................................. 2
A.C. Power .................................................................................................... 3
A.C. Frequency ............................................................................................. 3
Phase Angle................................................................................................... 4
Power Factor ................................................................................................. 4
Volt-Amps and Volt-Amps Reactive ............................................................ 5
Using the 1040C for Calibrating Polyphase Devices................................................ 7
A.C. Voltage.................................................................................................. 7
A.C. Current .................................................................................................. 7
A.C. Power .................................................................................................... 7
Phase Angle................................................................................................... 8
Power Factor ................................................................................................. 8
Volt-Amps and Volt-Amps Reactive ............................................................ 10
Calibrating Transducers Using the Null Comparison Method.................................. 11
Connection Diagrams................................................................................................ 12
Phase, Power Factor, and VAR Convention Diagram .............................................. 23
Appendix A: Meter Examples.................................................................................. 24

1
Calibrating Meters and Transducers
with the Arbiter Systems 1040C
Panel Meter Calibrator
Introduction
Because of the variety of parameters
involved, in-house and field calibration of
meters and transducers used in the power
industry has in the past required several
specialized instruments. The Arbiter
Systems Model 1040C Panel Meter
Calibrator has incorporated all of the
necessary functions into a single portable
unit, designed specifically for the task. The
purpose of this document is to provide a
guideline for using the 1040C to calibrate
commonly used meters and transducers.
The 1040C Panel Meter Calibrator is
used by service and calibration professionals
in the power generation and distribution
fields, to measure and/or insure the accuracy
of various meters and transducers used in
generating facilities and substations. The
instrument is also used by the U.S. Navy, to
perform similar calibrations on equipment
used for shipboard power generation and
distribution.
The 1040C Panel Meter Calibrator can be
configured to perform eight calibration
functions:
-Voltage (ac and dc);
-Current (ac and dc);
-Frequency;
-Power;
-Power Factor;
-Phase;
-VARs;
-Synchroscope.
A front panel keyboard and display allow
direct selection of values for all of the
parameters shown above. Entered values can
be further modified using a knob also located
on the front panel. A percent deviation key
provides a simple method of determining the
percentage of error for the meter or
transducer under test. An internal memory
allows storage of up to 99 instrument
configurations for repetitive calibration tasks.
Many of the operations performed via the
front panel can be duplicated using the
included hand-held control unit. Devices
which operate within the following ranges
can be calibrated with the 1040C:
-A.C. Voltage: 1.5 Vrms to 750 Vrms.
-A.C. Current: 0.1 Arms to 7.5 Arms.
-D.C. Voltage: 0.01 Vdc to 1000 Vdc.
-D.C. Current: 0.1 mAdc to 10.5 Adc.
-Frequency: 50 Hz to 75 Hz, 333 Hz
to 500 Hz.
-A.C. Power: 1.5 VA to 5625 VA.
-Power Factor: 0.0 to 1.0, lead or lag.
-Phase: +180 to -180 degrees.
-VARs: 1.5 VA to 5625 VA.
-Synchroscope: Selection between 0 and
180 degrees.

2
Using the 1040C for Calibrating Single Phase Devices
A.C. Voltage
Representative schematics are given in
figure 1 for typical circuit installations of
single phase ac voltage meters and
transducers. Connection of these instruments
to the 1040C for calibration is a very simple
process, illustrated in figure 2. The 1040C
current output leads are not used, and can be
left disconnected. The voltage output leads
should be connected to the voltage input of
the meter or transducer (figures 2a, 2c). If
the meter or transducer uses an external
potential transformer, it must be inserted
between the 1040C voltage output leads and
the input voltage leads of the unit under test
(see Figure 2b, 2d). The user should then
select the proper operating frequency, either
60 Hz or 400 Hz, and press the "Voltage"
key to put the instrument into the voltage
output mode. The desired voltage should
then be entered, using the keypad, followed
by the appropriate units. After this is
completed, pressing the "Operate" key will
enable the voltage output, which will
increase to the value entered. An equal sign
on the front panel display indicates that the
output voltage has stabilized at the desired
value. The calibration procedure for the
meter or transducer under test can then be
performed. For more complete instructions
on operation of the 1040C in the ac voltage
mode, refer to section 2.5.3 of the operation
manual.
A.C. Current
Calibration of a single phase transducer
or meter for ac current follows virtually the
same process as for ac voltage meters and
transducers, except that only the current
output of the 1040C is used, rather than only
the voltage output. Representative
schematics are given in figure 3 for typical
circuit installations of single phase ac current
meters and transducers. Connection of these
instruments to the 1040C for calibration is
illustrated in figure 4. The 1040C voltage
output leads are not used, and can be left
disconnected. The current output leads
should be connected to the current input of
the meter or transducer (figures 4a, 4c). If
the meter or transducer uses an external
current transformer, one output lead of the
1040C should be routed through the center of
the current transformer and connected to the
other lead (see Figure 4b, 4d). The user
should then select the proper operating
frequency, either 60 Hz or 400 Hz, and press
the "Current" key to put the instrument into
the current output mode. The desired current
should then be entered, using the keypad,
followed by the appropriate units. After this
is completed, pressing the "Operate" key will
enable the current output, which will increase
to the value entered. An equal sign on the
front panel display indicates that the output
current has stabilized at the desired value.
The calibration procedure for the meter or
transducer under test can then be performed.
For more complete instructions on operation
of the 1040C in the ac current mode, refer to
section 2.5.5 of the operation manual.

3
A.C. Power
Typical circuit connections for single-
phase ac watt meters and transducers are
given in figure 5. Calibration of these types
of devices requires use of both the voltage
and current outputs of the 1040C.
Representative calibration connection
diagrams for these types of devices are given
in figure 6. The 1040C voltage output leads
are connected to the voltage terminals of the
meter or transducer, and the 1040C current
output leads are connected to the current
input terminals of the meter or transducer
(figures 6a and 6c). If the meter or
transducer uses an external current
transformer, one of the current output leads
of the 1040C should be passed through the
center of the current transformer, and then
shorted to the other lead. If the meter or
transducer uses an external potential
transformer, then likewise it must be inserted
between the 1040C voltage output leads and
the input voltage leads of the unit under test.
Refer to figures 6b and 6d for these
connections. The user should then select the
proper operating frequency, either 60 Hz or
400 Hz. The "Power" key should be pressed,
which will place the 1040C into the power
mode, enabling both the voltage and current
outputs for simultaneous operation. The
"Voltage" key should then be pressed, and
the desired voltage entered using the keypad,
followed by "V". After this, the "Current"
key should be pressed and the desired current
entered using the keypad, followed by "A".
After this is completed, pressing the
"Operate" key will enable the outputs, which
will increase to the respective values entered.
An equal sign on the front panel display
indicates that the current and voltage outputs,
and the phase angle between them, have
stabilized at the proper values. The
calibration procedure for the meter or
transducer under test can then be performed.
The power value can be varied using the
control knob or the up/down arrows, but it is
important to note that it is only the current
that changes; the voltage remains constant.
For more complete instructions on operation
of the 1040C in the ac power mode, refer to
section 2.5.6 of the operation manual.
A.C. Frequency
Calibration of ac frequency is another
procedure that requires the use of only the
1040C voltage output. The connections are
the same as for the volt meter or transducer
(Figure 2). After connection, the frequency
range (i.e. 60Hz, 400Hz) is selected, then
"Voltage" is pressed. The operator then
enters the voltage value which is appropriate
for the device under test, followed by the
voltage unit key. Fine adjustment of the
frequency can be accomplished by first
pressing the "Frequency" key, then using the
adjust knob or up/down keys to select the
value. A value for frequency can also be
entered via the keyboard, by first pressing
"Frequency", entering the value, then
pressing the "Hz" key. When the "Operate"
key is pressed, the voltage output will be
enabled and the calibration procedure for the
device under test may be performed. For
more complete instructions on frequency
operation of the 1040C, refer to section 2.5.8
of the operation manual.

4
Phase Angle
Calibration of phase angle meters or
transducers for single phase operation
requires use of both the voltage and current
outputs of the 1040C. The representative
circuit connection diagrams for these types of
devices are the same as for the ac power
meters and transducers, given in figure 5.
Typical connections for calibration are also
the same as for ac power meters and
transducers, and are given in figure 6. For
calibration, the 1040C voltage output leads
are connected to the voltage terminals of the
meter or transducer, and the 1040C current
output leads are connected to the current
input terminals of the meter or transducer
(figure 6a and 6c). If the meter or transducer
uses an external current transformer, one of
the current output leads of the 1040C should
be passed through the center of the current
transformer, and then shorted to the other
lead. If the meter or transducer uses an
external potential transformer, then likewise
it must be inserted between the 1040C
voltage output leads and the input voltage
leads of the unit under test. Refer to figures
6b and 6d for these two types of connections.
The 1040C should first be configured to
operate in the ac power mode, as described in
paragraph 2.5.6, and the appropriate voltage
and current values should be selected. After
the outputs have been enabled and the phase
angle meter or transducer under test has been
observed to be indicating zero, press the
"Phase" button. This will allow shifting of
the relative phase between the voltage and
the current outputs. The desired phase angle
can now be entered directly, via the keypad,
and followed by the appropriate units
(degrees). A negative value for phase angle
corresponds to the output current lagging the
output voltage. After entering the value for
phase angle, the operator may adjust the
value by using the control knob, or by using
the "Up" or "Down" keys. For more
complete instructions on operation of the
1040C for phase angle calibrations, refer to
section 2.5.1 of the operation manual.
Power Factor
The Power Factor in a circuit is equal to
the cosine of the phase angle between the
voltage and the current. With this in mind,
any power factor can be simulated by
adjusting the phase relationship between the
voltage and current, which can be
accomplished quite easily with the 1040C.
Two methods can be used:
•The required phase angle can be entered
directly via the keypad, as described in
the section on phase angle calibration;
•The power factor can be entered directly,
by first pressing the "Power Factor" key,
then using the adjust knob to vary the
displayed power factor. This method
allows entry of lead or lag power factor
values without having to first calculate
the corresponding phase angle.
For an illustration of the relationship
between phase angle and power factor in the
1040C, refer to figure 12.
In order to accomplish power factor
indication, some transducer manufacturers
recommend using one of their phase angle
transducers and performing a mathematical
conversion on the output signal. This can be
done manually, using conversion tables
supplied by the manufacturer, or
automatically, using a meter having cosine
scaling. Typical transducer application
circuit connections and calibration setup
connections are usually the same as those for
a phase angle, watt, or var transducer, as
shown in figures 5 and 6. Calibration can be
performed using the connections in figure 6
and one of the methods outlined above, and
in accordance with the transducer
manufacturers recommendations.
Power factor output is also commonly
available as an additional feature on single

5
and multi-phase watt transducers. In this
case, the transducer is connected in the same
manner as a conventional watt transducer
(refer to figures 5 and 6).
Typical applications of power factor
meters for single-phase systems involve
circuit connections which are similar, if not
identical to those employed by single phase
watt and var meters. In light of this,
representative circuit and calibration
connection diagrams for these meters are
shown in figures 5 and 6. When connected
per the calibration setup diagram, calibration
of single-phase power factor meters can be
performed using one of the methods given
above, and in accordance with the meter
manufacturer's recommendations. For more
detailed instructions on operating the 1040C
for calibration of power factor, refer to
section 2.5.1 of the operation manual.
Volt-Amps and Volt-Amps Reactive
Volt-Amps is the product of the rms
voltage and the rms current in a circuit,
without regard to the phase angle between
them. Another term commonly used to
describe this parameter is apparent power. If
a separate rms ammeter and rms voltmeter
were used to measure the current and
voltage, respectively, and the two values
were multiplied together, the result would be
the apparent power. This is not an indication
of the amount of work that can be done,
however; if the phase angle is 90 degrees
(power factor is zero), the true power
available is zero.
Volt-amps reactive (SI unit=var) is the
same as volt-amps, but with the phase angle
between voltage and current factored in.
Vars are a measure of the amount of power
required by the reactive portion of a load,
and actually represents circulating current in
the circuit. Vars are calculated as the
product of the RMS voltage, the RMS
current, and the sine of the phase angle
between the two. For an illustration of the
relationship between phase angle and vars
when using the 1040C, refer to figure 12.
The 1040C has a provision for displaying
and modifying both volt-amps and vars;
successively pressing the "Power" key during
operation will first display watts, then vars,
then volt-amps. The user can continue
indefinitely to scroll through these three
choices.
Some points of interest regarding va and
var measurements:
It is important to note that unless there is
a phase angle of greater than zero
between voltage and current, the var
value will be zero. Also, since va and var
indications are sub-functions of the
power mode, adjustment of these values
using direct entry, the control knob, or
the up/down keys affects the value by
changing only the current, not the voltage
or the phase angle. The current can only
be modified to a point within the current
range of the 1040C. If the necessary
current exceeds this range, the display
will indicate "Entry Error". Additionally,
if the phase angle is set to zero and the
user attempts to enter any var value other
than zero, "Entry Error" will be indicated.
This is because under these conditions,
no value of voltage or current will
produce anything other than zero vars.
Typical applications of va and var meters
or transducers for single-phase systems
involve circuit connections which are
similar, if not identical to those employed by
single phase watt and power factor meters
and transducers. Therefore, representative
circuit connections and calibration
connections for these devices are shown in
figures 5 and 6, respectively. When
connected per the calibration setup diagram,
calibration of these instruments can be
performed in accordance with the meter
manufacturer's recommendations. For more

6
detailed instructions on operating the 1040C
in the volt-amps and volt-amps reactive
modes, refer to section 2.5.6 of the operation
manual.

7
Using the 1040C for Calibrating Polyphase Devices
A.C. Voltage
Commercially available multi-phase
voltage transducers frequently consist of
more than one single-phase model from the
manufacturers product line, repackaged into
a common enclosure. In many cases, the
outputs remain separate and independent.
The procedure for calibration of these types
of transducers is virtually identical to that of
the single-phase voltage transducer. The
three elements can be connected in parallel
across the voltage output of the 1040C, as
shown in figure 7a, provided that the
combined current demand of the elements
does not exceed the burden capability of the
1040C (refer to table 1.2 in the operation
manual). Multiple voltmeters may also be
connected to the 1040C in the same manner,
as shown in figure 7b, with the same total
current burden restriction.
A.C. Current
Like their ac voltage counterparts,
commercially available multi-phase current
transducers frequently consist of more than
one single-phase model from the
manufacturers product line, repackaged into
a common enclosure. In many cases, the
outputs remain separate and independent.
The procedure for calibration of these types
of transducers is nearly identical to that of
the single-phase current transducer. The
three elements can be connected (in series)
across the current output leads of the 1040C,
as shown in figure 8a, provided that the
combined voltage drop across the elements
does not exceed the burden capability of the
1040C (refer to table 1.1 in the operation
manual). Multiple current meters may also
be connected to the 1040C in the same
manner, as shown in figure 8b, with the same
total voltage burden restriction.
A.C. Power
Power measurement in a three-phase,
four-wire system requires three complete
watt meters or watt transducers (each watt
meter or transducer consists of one current
element and one voltage element). Figure 9a
shows a typical connection diagram for
measurements of this type. A current sensing
element is placed in series with each of the
three phases, and a voltage sensing element
is connected between each of the phases and
the neutral wire. It is unnecessary to
measure the neutral current directly, since
any current flowing in the neutral conductor
will be simultaneously flowing in one or
more of the phases and will thus be
measured.
Power measurement in a three-phase,
three-wire system requires two complete watt
meters or watt transducers. Figure 9b shows
a connection diagram for this type of
measurement. Again, the number of current
elements required is equal to one less than
the number of current-carrying conductors,
since any current in the non-instrumented
conductor must simultaneously be flowing in
one or both of the others. The voltage
elements are connected to the two phases
having the current elements, with the
common point for the voltage elements being
the third phase.
Calibration of multi-element watt
transducers or meters can be accomplished
using the setup shown in figure 10.
Basically, all of the current elements would
be connected in series and placed across the
current output of the 1040C, and all of the
voltage elements would be connected in
parallel and placed across the voltage output
of the 1040C. Again, current and potential
transformers are shown for reference.
Phasing of the elements is of great

8
importance for accuracy of the calibration.
All current elements should be wired the
same way, and all voltage elements should be
in phase. The only exception to this rule
would be for 2 1/2 element transducers,
which are sometimes used in order to save
the cost of one potential transformer. The
missing potential input is accounted for
mathematically, so during calibration one of
the current transformers must be reversed,
and special calculations apply. When
calibrating 2 1/2 element transducers, the
product documentation for the device should
be consulted for proper procedures.
Phase Angle
Wiring connections for phase angle
transducers used in three-phase systems at
first glance may appear somewhat
unorthodox. Typically, a single voltage
element and a single current element are
used. The current element is placed in series
with one of the phases, or, if used, a current
transformer is placed around the conductor
for that phase. The voltage element is wired
between the remaining two phases,
sometimes employing a potential
transformer. Refer to figure 11a for a typical
application circuit. If the phase angle
between the voltage and the current in the
circuit is zero, the net voltage between the
two measured phases (or the output voltage
of the potential transformer) will be offset
from the current measured in the third phase
by 90 degrees. The two input signals are
compared internally, and a dc voltage
corresponding to the phase angle is output
from the transducer.
Connections for use of a 1040C to
calibrate this type of phase angle transducer
are shown in figure 11b. The 1040C voltage
output leads are connected to the voltage
terminals of the transducer, and the 1040C
current output leads are connected to the
current input terminals of the meter or
transducer. If the transducer uses an external
current transformer, one of the current output
leads of the 1040C should be passed through
the center of the current transformer, and
then shorted to the other lead. If the meter or
transducer uses an external potential
transformer, then likewise it must be inserted
between the 1040C voltage output leads and
the input voltage leads of the unit under test.
The 1040C should first be configured to
operate in the ac power mode, and the
appropriate voltage and current values should
be selected. Next, a calibration phase angle
value must be entered, keeping in mind that
for indication of zero phase from the
transducer output, the input voltage must be
offset from the input current by 90 degrees
(whether this is a lead or lag condition
depends on the individual transducer
manufacturer. The calibration procedure for
the phase angle transducer can now be
performed. For more complete instructions
on operation of the 1040C for phase angle
calibrations, refer to section 2.5.1 of the
operation manual.
Power Factor
In order to accomplish power factor
indication, some transducer manufacturers
recommend using one of their phase angle
transducers and performing a mathematical
conversion on the output signal. This can be
done manually, using conversion tables
supplied by the manufacturer, or
automatically using a meter having cosine
scaling. If a phase angle transducer is
employed for this purpose, the connections
will be the same as those illustrated in figure
11.
Power factor output is also commonly
available as an additional feature on single
and multi-phase watt transducers. In this
case, the transducer is connected in the same
manner as a conventional multi-phase watt
transducer (refer to figure 9).

9
Regardless of the type of transducer or
meter employed, the 1040C has a provision
for direct calibration of power factor. As
stated earlier in this document, the power
factor in a circuit is equal to the cosine of the
phase angle between the voltage and the
current. With this in mind, any power factor
can be simulated by adjusting the phase
relationship between the voltage and current,
which can be accomplished quite easily with
the 1040C. Two methods can be used:
•The required phase angle can be entered
directly via the keypad, as described in
the section on phase angle calibration;
•The power factor can be entered directly,
by first pressing the "Power Factor" key,
then using the adjust knob to vary the
displayed power factor. This method
allows entry of lead or lag power factor
values without having to first calculate
the corresponding phase angle.
Calibration of the transducer should be
performed according to the instrument
manufacturer's recom-mendations.
Typical applications of power factor
meters for multi-phase systems involve
circuit connections which are similar, if not
identical to those employed by multi-phase
phase angle transducers. Generally, the
current is measured in one phase, and a
comparison is made between it and the net
voltage between the remaining two phases.
Substituting a meter for the transducers
shown in figure 11 will give a good
indication of the type of connections
necessary for typical applications and
calibration.
For more detailed instructions on
operating the 1040C for calibration of power
factor, refer to section 2.5.1 of the operation
manual.

10
Volt-Amps and Volt-Amps Reactive
Refer to the single-phase volt-amps and
volt-amps reactive section of this document
for definitions of these parameters.
The 1040C has a provision for displaying
and modifying both volt-amps and vars;
successively pressing the "Power" key during
operation will first display watts, then vars,
then volt-amps. The user can continue
indefinitely to scroll through these three
choices.
Some points of interest regarding va and
var measurements:
It is important to note that unless there is
a phase angle of greater than zero between
voltage and current, the var value will be
zero. Also, since va and var indications are
sub-functions of the power mode, adjustment
of these values using direct entry, the control
knob, or the up/down keys affects the value
by changing only the current, not the voltage
or the phase angle. The current can only be
modified to a point within the current range
of the 1040C. If the necessary current
exceeds this range, the display will indicate
"Entry Error". Additionally, if the phase
angle is set to zero and the user attempts to
enter any var value other than zero, "Entry
Error" will be indicated. This is because
under these conditions, no value of voltage or
current will produce anything other than zero
vars.
Typical applications of va and var meters
or transducers for multi-phase systems
involve circuit connections which are
similar, if not identical to those employed by
multi-phase watt and power factor meters
and transducers. Therefore, representative
circuit connections and calibration
connections for these devices are shown in
figures 9 and 10, respectively. When
connected per the calibration setup diagram,
calibration of these instruments can be
performed in accordance with the meter
manufacturer's recommendations. For more
detailed instructions on operating the 1040C
in the volt-amps and volt-amps reactive
modes, refer to section 2.5.6 of the operation
manual.

11
Calibrating Transducers Using the Null Comparison Method
The null comparison method is
frequently recommended by transducer
manufacturers, since it eliminates many of
the variables that can be encountered in the
course of a conventional calibration. The
basic procedure for performing a null
comparison calibration is as follows: The
inputs of a precision standard are connected
in parallel with the inputs of the transducer
under test, and the appropriate source
voltages and/or currents are applied. A
differential meter is connected between the
outputs of the precision standard and the
transducer under test, and the zero and span
settings of the transducer under test are
adjusted until the differential meter dislays
zero. The advantage of this method is that
since the input signals are exactly the same,
the accuracy of the source (and the
equipment used to measure it) are
inconsequential. The calibration accuracy is
dependent only on the individual accuracies
of the precision standard and of the
differential meter.
Precision standards are usually available
from the manufacturers of the transducers,
and typically have accuracies of 0.1%. The
disadvantage of using precision standards is
that for each type of transducer to be
calibrated, a different precision standard is
required. Use of the 1040C eliminates the
need for these various precision standards,
since all of the necessary functions can be
generated from one unit. Also, since the
1040C is a precision source and no external
meters are necessary, the simplicity of the
calibration procedure is about the same as
that of the null comparison method.

12
a) Voltmeter, Typical Installation,
no Potential Transformer
V
L
1
N
L
1
N
L
I
N
E
V
Inst.
Pwr. +
-Output
L
1
N
L
I
N
E
L1
N
L
O
A
D
c) Voltage Transducer, Typical
Installation, no Potential Transformer
L
O
A
D
Figure 1
Single-Phase Voltage Meters and Transducers,
Typical Circuit Connections
V
L
I
N
E
L
1
N
L
1
N
b) Voltmeter, Typical Installation,
with Potential Transformer
L
O
A
D
V
Inst.
Pwr. +
-Output
L
1
N
L
I
N
E
L1
N
d) Voltage Transducer, Typical
Installation, with Potential Transformer
L
O
A
D

13
a) Voltmeter Calibration Connections,
no Potential Transformer
V
V
Inst.
Pwr. +
-Output
c) Voltage Transducer Calibration Connections,
no Potential Transformer
Figure 2
Single-Phase Voltage Meters and Transducers,
Typical Circuit Connections
1040C
V
out
1040C
V
out
RB
V
Inst.
Pwr. +
-Output
d) Voltage Transducer Calibration Connections,
with Potential Transformer
1040C
V
out
RB
V
b) Voltmeter Calibration Connections,
with Potential Transformer
1040C
V
out
RB
RB

14
a) Current Meter, Typical Installation,
no Current Transformer b) Current Meter, Typical Installation, with Current Transformer
Inst.
Pwr. +
-Output
L
1
N
L
O
A
D
L
1
N
L
I
N
E
c) Current Transducer, Typical Installation,
no Current Transformer d) Current Transducer, Typical Installation, with Current Transformer
L1
N
L1
N
L
I
N
E
L
O
A
D
Figure 3
Single-Phase Current Meters and Transducers,
Typical Circuit Connections
L
I
N
EN
L1L1
N
L
O
A
D
Inst.
Pwr. +
-Output
L
I
N
EN
L1L1
N
L
O
A
D

15
a) Current Meter Calibration Connections,
no Current Transformer b) Current Meter Calibration Connections, with Current Transformer
c) Current Transducer Calibration Connections,
no Current Transformer d) Current Transducer Calibration Connections, with Current Transformer
Figure 4
Single-Phase Current Meters and Transducers,
Calibration Connections
RB
1040C
out
1040C
out
RB
Inst.
Pwr. +
-Output
1040C
out
RB
Inst.
Pwr. +
-Output
1040C
out
RB

16
a) W/Var/PF Meter, Typical Installation,
no Current or Potential Transformers b) W/Var/PF Meter, Typical Installation, with Current and Potential Transformers
W/Var/PF
W/Var/PF/PA
Inst.
Pwr. +
-Output
c) W/Var/PF Transducer, Typical Installation,
no Current or Potential Transformers d) W/Var/PF/PA Transducer, Typical Installation, with Current and Potential Transformers
Figure 5
Single-Phase Watt, Var, or Power Factor Meters and
Watt, Var, Power Factor, or Phase Transducers,
Typical Circuit Connections
Current
Connections Voltage Connections
Current
Connections Voltage
Connections
L
1
N
L
I
N
E
L
O
A
D
L
1
N
W/Var/PF
Current
Connections Voltage
Connections
L
1
L
1
NN
L
O
A
D
L
I
N
E
L
1
N
L
I
N
E
L
O
A
D
L
1
N
W/Var/PF/PA
Inst.
Pwr. +
-Output
Current
Connections Voltage
Connections
L
1
L
1
NN
L
O
A
D
L
I
N
E

17
W/Var/PF
a) W/Var/PF Meter Calibration Connections,
no Current or Potential Transformers b) W/Var/PF Meter Calibration Connections, with Current and Potential Transformers
W/Var/PF
W/Var/PF/PA
Inst.
Pwr. +
-Output
W/Var/PF/PA
Inst.
Pwr. +
-Output
c) W/Var/PF/PA Transducer Calibration Connections,
no Current or Potential Transformers d) W/Var/PF/PA Transducer Calibration Connections, with Current and Potential Transformers
Figure 6
Single-Phase Watt, Var, or Power Factor Meters and
Watt, Var, Power Factor, or Phase Transducers, Calibration Connections
RB RB
1040C
out
V
out
Current
Connections Voltage
Connections
Current
Connections Voltage Connections
RBBR
1040C
out
V
out
1040C
out
V
out
RBRB
Current
Connections Voltage
Connections
B R
1040C
out
V
out
RB
Current
Connections Voltage
Connections

18
Figure 7
Calibration of Multiple Voltage Transducers or Meters
V
1
111
ZAZBZC
Total Burden Current =
Where:
V= Output Voltage of 1040C
Zx= Impedance of Transducer or
Meter x, at Frequency
of Operation
c) Burden Calculation
b) Meters
1040C
out
V
out
V
A
V
B
V
C
RB
1040C
out
V
out
AB
C
Vin Vin Vin
+
-
+
-
+
-
}
Outputs,
To DVM(s)
RB
a) Transducers
Inst.
Pwr.
++
...