7-3
IM 2558A-01EN
Synchronous Operation
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Index
7.2 Synchronous Operation
This section explains how to synchronize three 2558As.
Procedure
• Connecting the 2558As
1.
Using BNC cables, connect the OSC OUTPUT I and Q signals from the 2558A that will be the
master device to the EXT OSC INPUT I and Q connectors on the first slave 2558A.
2.
Using BNC cables, connect the OSC OUTPUT I and Q signals from the first slave 2558A to the
EXT OSC INPUT I and Q connectors on the second slave 2558A.
Setup example:
Frequency set to 60 Hz
EXT 1
OSC OUTPUT
EXT OSC INPUT
EXT 1
OSC OUTPUT
EXT OSC INPUT
EXT 1
OSC OUTPUT
EXT OSC INPUT
2558A (Master)
2558A (Slave1)
2558A (Slave2)
Q(sin)
I(cos)
Q(sin)
I(cos)
Setup example:
Frequency set to EXT2
Setup example:
Frequency set to EXT2
I
I
Q
Q
I
I
Q
Q
I
I
Q
Q
• Configuring the Master 2558A
Turn the
FREQUENCY
dial to select 60 Hz.
See “Selecting a Fixed Frequency (50 Hz, 60 Hz, or 400 Hz)” in section 5.2.
• Configuring the Slave 2558As
1.
Turn the
FREQUENCY
dial to select EXT2(PHASE).
See “Selecting External Oscillator EXT2” in section 5.2.
2.
If necessary, adjust the phase angle.
See “Selecting External Oscillator EXT2” in section 5.2.
Explanation
OSC OUTPUT Signal and the Phase of Voltage or Current Output
If you configure a 2558A to use the internal oscillator with the FREQUENCY dial, the 2558A will
output a cosine signal of the internal two-phase oscillator from the OSC OUTPUT I connector and
a sine signal from the Q connector. In this case, the amplitude of the voltage or current output is
adjusted on the basis of the cosine signal, so the phase will be close to the cosine signal, but the
phase of the circuit will be added to it.
If you select EXT1 or EXT2 with the FREQUENCY dial, the 2558A will output the EXT OSC INPUT
I and Q signals from the corresponding OSC OUTPUT connectors. In this case, the signals will not
be affected by the phase values. This makes it easy to connect multiple 2558A in a daisy chain. The
maximum number of devices that can be connected is six.
