3-2
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.
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