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Chapter 5, FRONT PANEL OPERATION
5-22
is faster using the Keypad or Active Cursor controls - see section 4.1.04.
STEP AMPLITUDE
This control defines the amount by which the oscillator amplitude is changed at each
step. It may be set to any value between 0.000 V rms and 5.000V rms with a 1 mV
resolution. Adjustment is faster using the Keypad or Active Cursor controls - see
section 4.1.04.
If Start Amplitude is greater than Stop Amplitude then the oscillator amplitude will
decrease with time.
TIME/STEP
This control defines the time that the oscillator amplitude remains at each step of the
complete frequency sweep. The range of available values is 1 s to 1000 s in 1 ms
increments for the RCU oscillator output, and 100 ms to 1000 s in 1 ms steps for the
main console oscillator output.
Note that the time per step defined here also applies to oscillator amplitude sweeps -
see section 5.3.10
ARMED
When this control is set to YES, the amplitude sweep is armed. The sweep can then
be started in one of two ways:
a) If the LINK TO CURVE BUFFER control is set to YES then the sweep will be
started at the same time as a curve buffer acquisition starts (see section 5.3.24).
This mode allows the buffer to be used for linearity measurements, whereby the
response of an external network or system is measured by sweeping the
oscillator amplitude while recording the lock-in amplifier's outputs, for example
magnitude and phase. Since the curve buffer can be started using internal or
external triggers there is considerable flexibility for designing experiments.
In this mode the START control is grayed out as it is inactive.
b) If the LINK TO CURVE BUFFER control is set to NO then the START control above
it is shown in bright text, to indicate that it is active. In this mode, the amplitude
sweep is independent of the curve buffer and is operated by pressing the adjacent
key. The control annotation changes depending on whether a sweep is
running, as follows:
START
Pressing the adjacent
changes to PAUSE
STOP
Pressing the adjacent
When a sweep has been started and the ARMED control is not shown, the
following two options are also available.
PAUSE
Pressing the adjacent
amplitude. The control changes to CONTINUE
CONTINUE
Pressing the adjacent
present amplitude. The control changes to PAUSE
key starts the amplitude sweep. The ARMED control
key stops the amplitude sweep.
key pauses the amplitude sweep at the present
key restarts the paused amplitude sweep from the
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