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.
