6 If you want to trigger the start of data collection, set up triggering.
Press [
Trigger
], then press the softkey corresponding to the trigger type you want to
use.
Press [
TRIGGER SETUP
], then specify the triggering parameters.
7 If you will display phase information when you measure from the buffer using the
order instrument mode, you must enable external triggering.
Press [
Trigger
][
EXTERNAL TRIGGER
].
Press [
TRIGGER SETUP
], then set up the external trigger parameters.
In most cases, the Agilent 35670A allows you to measure from the time-capture buffer
using any instrument mode—regardless of the mode you used to fill it. There are three
exceptions:
• You can neither fill nor measure from the buffer using the swept sine mode.
• If you fill the buffer using FFT mode and a start frequency greater than 0 Hz (which
provides “zoomed” data), you can measure from the buffer only if the FFT mode is
selected.
• If you fill the buffer without including tachometer data, you cannot measure from
the buffer using order mode.
Although these are the only cases where it is not possible to change instrument modes
when you measure from the buffer, it is generally better to fill and measure from the
buffer using the same mode.
Step 4 is not required when you fill the time-capture buffer using the order instrument
mode. Tachometer data is always included in the buffer when you fill it with the order
mode selected. (And the [
MAX RPM
] value is taken directly from the [
Freq
] menu.)
Agilent 35670A
Operator's Guide Using Time Capture
7-3
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