Ametek 7270 Instruction Manual page 77

Figure 5-20, Configuration Menu Structure
The controls on the Configuration menu operate as follows.
NOISE MEASUREMENT
This control is used to configure the instrument for noise measurements. When
turned ON, the Main Display output displays (see section 5.3.01) are set as follows:
Display Position Displayed Output
1 Noise expressed in V/Hz in large digits
2 Noise expressed in V/Hz as a bar-graph
3 X output in expressed as a percentage of the full-scale
sensitivity as a bar-graph
4 Magnitude output (R) output in expressed as a
percentage of the full-scale sensitivity in large digits.
The available output time constant is restricted to the values in the range 500 µs to
10 ms inclusive, since it is only at these values that the noise measurements are
calibrated, and the synchronous time constant control (section 5.3.06) is turned off.
The output filter slope is also restricted to either 6 or 12 dB/octave.
When the noise measurement control is turned OFF then the instrument is configured
for normal lock-in amplifier operation.
NOISE BUFFER LENGTH
This control, which is only active when the above NOISE MEASUREMENT control is
turned ON, sets the averaging time of the buffer used to determine the mean value of
the output signal when making noise measurements. Settings of Off, 1 s, 2 s, 3 s and
4 s can set using the adjacent
The operation of this control is described in more detail in section 3.3.20
Firmware version X.X
This line, immediately under the menu title, gives the version number of the
Chapter 5, FRONT PANEL OPERATION
key.
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