Cable and Antenna Analyzer Measurement Guide : Cable and Antenna Analyzer Measurements : Setting Sweep Parameters
 
Setting Sweep Parameters
The sweep menu includes settings for the number of trace data points, run/hold mode, sweep type, sweep and RF immunity. With the exception of changing the number of trace data points, these settings can be changed without affecting the current user calibration.
Point Count
The point count can be user defined. The range is between 2 and 10,049 for both Standard and Flex calibrations.
When flex calibration is applied to Site Master and Field Master instruments the point count selection is between 2 to 10,049 data points.
When the standard calibration is applied to Site Master and Field Master instruments the point count snaps to the nearest calibration data point such as:
• OSL Calibration: 10,049, 5025, 2513, 1257, 629, 315, 158, 65, 33, 17, 9, 5, 3 and 2
• OSL + Trans (USB Sen)/Trans (USB Sen) Calibration: 1251, 626, 251, 126, 51, 26, 11, 6, 3 and 2
The snap point counts ensure that all points in the sweep are calibration measurement points rather than interpolated points. The point count can be changed with the calibration enabled, but it will always snap to the nearest calibrated point count. The Start/Stop frequencies cannot be changed when the calibration is started.
Once the calibration is complete, the unit will return to the point count and Start/Stop frequencies that were in place at the start of the cal. The number of points and Start/Stop frequencies can be changed with the calibration enabled, with each frequency point being interpolated from the flex cal.
The default point count setting is 315. This is recommended for most measurements. Increasing the point count increases the resolution of the measurement but slows down the sweep speed. The increased resolution can be helpful in DTF, as it enables increased distance coverage for the same distance resolution.
1. Select SWEEP on the main menu to open the SWEEP Menu.
2. Select POINT COUNT and enter the desired number using the numeric keypad.
Run/Hold
RUN/HOLD is used to start and stop line sweeping. When in hold mode, the RF output can be set on or off.
1. Select SWEEP on the main menu to open the SWEEP Menu.
2. Select RUN/HOLD to and select Run or Hold.
3. When in hold mode, toggle the RF IN HOLD button to enable or disable the RF output.
Sweep Type
This button sets single or continuous sweep mode. In single sweep mode, each sweep is initiated SWEEP ONCE button.
1. Select SWEEP on the main menu to open the SWEEP Menu.
2. Select SWEEP TYPE to and select Single or Continuous.
3. When in single sweep mode, press SWEEP ONCE to start one line sweep.
RF Immunity
The RF Immunity setting provides a way to protect the instrument from stray signals generated by nearby or co-located transmitters that can affect measurements. Interfering signals can make the measurement look better or worse than it is. To improve the instrument’s ability to reject unwanted signals, you can set the RF immunity to high. However, sweep speed may be slowed as a result.
The RF immunity default setting is low, which makes the instrument more susceptible to interfering signals during a measurement, but optimizes sweep speed. This is appropriate when the instrument is used in an environment where RF noise is not of great concern.
1. Select SWEEP on the main menu to open the SWEEP Menu.
2. Select RF IMMUNITY and select either High or Low.
SWEEP Menu
SWEEP Menu
 
POINT COUNT
Enters the number of data points for the sweep.
RUN/HOLD
Toggles between Run and Hold. When in hold mode, pressing this key starts the sweeping and provides a trigger. When in the run mode, pressing this key pauses the sweep.
SWEEP TYPE
Toggles between single sweep and continuous sweep. In single sweep mode, each sweep must be activated by pressing SWEEP ONCE.
SWEEP RATE
Selects the sweep rate as either normal or fast.
SWEEP ONCE
When sweep is set to single sweep, SWEEP ONCE triggers a single measurement sweep.
AVERAGING STATE
Toggles averaging state on or off. When the averaging state is turned on the trace is swept the number of times equal to the set value of sweep averaging.
SWEEP AVERAGING
Sets the number of sweeps to be averaged, with a minimum value as 1 and maximum value is 1000.
RF IMMUNITY
Select this key to toggle between RF immunity High or Low. The default setting is Low. Refer to RF Immunity for details.
OUTPUT POWER
Toggles the Output Power between Low and High. The power level defaults to Low (~ –30 dBm) for all 2-port measurements. This is ideal if you are measuring active devices such as Tower Mounted Amplifiers. The low power setting will ensure the measurement is made in the linear region and that the instrument is not over powered. Output power set to High (~ 0 dBm) should only be used when making loss measurements. Please note that calibration is only valid for the selected output power level. Only available in MS2085A/89A instruments.
RF IN HOLD
Select this toggle, to enable or disable RF output, when in hold mode.
DYNAMIC RANGE
Toggles the dynamic range between Low and High. The high dynamic range mode can be used for applications where additional dynamic range is required. Note that the sweep speed slows down in high dynamic range mode. Only available in MS2085A/89A instruments.