Specifies the margin RFmx adds to the RFMXSPECAN_ATTR_REFERENCE_LEVEL attribute. The margin avoids clipping and overflow warnings if the input signal exceeds the configured reference level.

Syntax

RFMXSPECAN_ATTR_REFERENCE_LEVEL_HEADROOM

Numeric Value

Data Type

Access

Applies To

1052668

float64

Read/Write

N/A

Remarks


RFmx configures the input gain to avoid clipping and associated overflow warnings provided the instantaneous power of the input signal remains within the Reference Level plus the Reference Level Headroom. If you know the input power of the signal precisely or previously included the margin in the Reference Level, you could improve the signal-to-noise ratio by reducing the Reference Level Headroom.

You do not need to use a selector string to configure or read this attribute for the default signal instance. Refer to the Selector String topic for information about the string syntax for named signals.

Supported devices: PXIe-5668, PXIe-5830/5831/5832/5840/5841/5842/5860.

Default values

PXIe-5668

6 dB

PXIe-5830/5831/5832/5841/5842/5860

1 dB

PXIe-5840

0 dB