Agilent Technologies N8201A Service Manual download pdf (Page 62)

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62 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz

2 Amplitude / Y Scale

Ref Lvl Offset

Adds an offset value to the displayed reference level. The reference level is the absolute

amplitude represented by the top graticule line on the display. Reference-level offsets are

entered using the keyboard. Offsets are used when a gain or loss occurs between a device

under test and the N8201A input. Thus, the signal level measured by the N8201A may be

thought of as the level at the input of an external amplitude conversion device. Entering an

offset does not affect the trace position or attenuation value, just the displayed value

readouts such as reference level and marker amplitudes.

The maximum reference level available is dependent on the reference level offset. That is,

Ref Level − Ref Level Offset must be in the range −170 to +30 dBm.

For example, the reference level value range can be initially set to values from −170 dBm to

30 dBm with no reference level offset. If the reference level is first set to −20 dBm, then the

reference level offset can be set to values of −50 to +150 dB.

If the reference level offset is first set to −30 dB, then the reference level can be set to

values of −200 dBm to 0 dBm. In this case, the reference level is “clamped” at 0 dBm

because the maximum limit of +30 dBm is reached with a reference level setting of 0 dBm

with an offset of −30 dB. If instead, the reference level offset is first set to 30 dB, then the

reference level can be set to values of −140 to +60 dBm.

When a reference level offset is entered, the offset value appears on the left side of the

display under Offst (as opposed to frequency offsets which appear at the bottom of the

display.) To eliminate an offset, press Ref Lvl Offst, 0, and dB.

Key Path: AMPLITUDE / Y Scale

Annunciation/Annotation: The offset is displayed to the left of the display; third from

the top, just below the scale type.

State Saved: Saved in Instrument State

Factory Preset: 0.0 dB

Remote Command:

:DISPlay:WINDow[1]:TRACe:Y:[SCALe]:RLEVel:OFFSet

<rel_power>(in dB)

:DISPlay:WINDow[1]:TRACe:Y:[SCALe]:RLEVel:OFFSet?

Example:

DISP:WIND:TRAC:Y:RLEV:OFFS 12.7

Sets the Ref Level Offset to 12.7 dB. The only valid suffix is dB. If no suffix is sent, dB will be

assumed.

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Agilent Technologies N8201A Service Manual Page 62

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