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Table 1. Flatness-correction calibration procedure
8510C Keystrokes
Description
Set up the power meter (see Table 2)
For proper operation, the E4418B must be set up before initiating the flatness-correction routine.
See Table 2 for specific instructions.
Verify the power meter's address on the 8510 system
[LOCAL]
When shipped from the factory, the address of the power meter is 13. If this conflicts with another instrument on the system bus,
{POWERMETER}
change the address of the conflicting instrument. The power meter must be set to address 13 in order for the firmware to func-
tion properly. Press [SYSTEM/INPUTS], {REMOTE INTERFACE} and {INTERFACE OVERVIEW} on the E4418B to ensure the
power meter's address is set to 13. Verify that the power meter is connected to the system bus.
Set up the analyzer and measurement
Set up the start/stop frequencies and the measurement type (for example, S
Adjust the number of analyzer trace points (if needed)
STIMULUS [MENU]
When the flatness calibration is initiated, the analyzer sends the source a list of flatness-correction frequencies equal to the
{NUMBER OF POINTS}
number of trace points set on the analyzer.
{POINTS}
Set the source to the maximum leveled power
STIMULUS [MENU]
Set the 8360 for maximum specified power (P
{POWER MENU}
power meter will take less time to settle between measurement points during the calibration process.
{POWER SOURCE 1}
P
[x1]
1
Connect the power sensor to the active test port and begin the flatness calibration
Initiate flatness calibration
{POWER FLATNESS}
Do not cycle the power on the analyzer or the source during the calibration process. The calibration may be aborted at any time by
{CALIBRATE FLATNESS} pressing any key on the analyzer's front panel. Aborting the calibration is not recommended, since the command may cause the
system to freeze. By pressing {CALIBRATE FLATNESS} the analyzer will remind the user to zero the power meter and connect the
power sensor to the source. Press {CALIBRATE FLATNESS} again on the analyzer to initiate the calibration. Once initiated, the
analyzer retrieves the power meter measurement data and transfers it to the 8360 where it is processed and stored with the
appropriate correction frequency. During the flatness-correction calibration, the analyzer will display MEASURING DATA, xx%
DONE, PRESS ANY KEY TO ABORT. The xx% DONE indicates the percentage of the total number of correction points that have
been measured; it is not an indication of elapsed measurement time. When the flatness-correction calibration is completed, the
analyzer will automatically store the correction table into register 1 of the source. Any new calibration of the source will overwrite
the flatness-correction table.
Activate the flatness-correction
{FLATNESS ON}
The source output power will now be unleveled as it attempts to output the test port power level (Power Source 1) plus the flat-
ness correction for each measurement point in the frequency span. IF Overload or Source 1 Warning—RF Unleveled may be dis-
played on the analyzer until the test power level is reduced.
Set the test port power level
STIMULUS [MENU]
Set the test port power level (P
{POWER MENU}
in the measurement span. A constant power level equivalent to P
{POWER SOURCE 1}
calibration can be varified using the E4418B to measure the power at certain CW frequencies in the frequency range.
P
[x1]
2
Perform the measurement calibration
Compensate for systematic errors by performing a measurement calibration (if desired). Although a measurement calibration can
be performed before or after the flatness-correction calibration with or without correction enabled, it is recommended that the cal-
ibration be performed after the flatness correction is enabled. The calibration is no longer valid if the source power is changed
after performing the calibration.
Connect the DUT to the test port
) at the highest frequency in the span; see Table 3. At higher power levels, the
1
) equal to or below the maximum allowed test port power (see Table 3) for the highest frequency
2
, S
).
11
12
will now be available at the test port. The flatness-correction
2
5
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