Ch2 Display And Output - Stanford Research Systems SR844 User Manual

CH2 Display and
Output
The keys in this section select the Channel 2 display
quantity and analog CH2 OUTPUT, as well as offsets,
expands and ratios.
Display This key selects the Channel 2 Display quantity. Channel 2 may display Y [Volts],
θ€
[Degrees], Ynoise [Volts], Ynoise [dBm], or AUX IN 2 [Volts]. The displayed
quantity appears on a 4½ digit display and also on the accompanying bar-graph display.
An indicator shows the currently displayed quantity.
Quantity
Y
θ
[Deg]
Ynoise
[Volts]
Ynoise
[dBm]
AUX IN 2
Description
This is the component of the input signal in quadrature with the reference.
The reference phase may be adjusted; see the section on Reference Phase
later in this chapter for more information.
This is the phase of the input signal, measured in Degrees.
This is the input signal noise at the reference frequency, and is derived from
the Y measurements. This quantity is discussed in greater detail in Chapter
2, Noise Measurements.
This is the same quantity as above, converted into dBm. The dBm
computation assumes a 50
This is the voltage applied to the rear panel AUX IN 2.

CH2 Display and Output 3-21

Ω
load.
SR844 RF Lock-In Amplifier