System Power Calibration

Overview

The system power calibration is required after the configuration setup. After you installed all modules, the system power calibration should be executed once. The calibrated data is stored in your PC with your configuration. It is valid unless the configuration is changed. The purpose of calibration and procedure are different depending on the receiver module.

M9376A

Purpose
- Calibrate the source power level and linearity at the test ports.
- Calibrate the source power for the parallel measurements.
Procedure
- Calibration for power level only.

M9377A Direct Access Receiver configuration

Purpose
- Calibrate the source power level and linearity at the M9377A source output ports.
Procedure
- Calibration for power level only.

Combination of M9377A and M9378A

Purpose
- Calibrate the source power level and linearity at the test ports.
- Acquire 1 port error term.
Procedure
- Calibration for power level, S parameters and absolute measurement parameters.
- In the procedure, one port is assigned as a reference port. The port is calibrated with a power sensor, then the other ports are calibrated with the reference port. If your configuration has any M9376As, the lowest number port of M9376A is assigned as the reference port. If your configuration has sets of M9377A and M9378A only, two ports are assigned as reference ports with the following priority (standard configuration, Wide Dynamic Range configuration, High Power configuration, High Gain configuration).

Note: Error Terms of cal set does not include the error terms of both M9377A and M9378A after user calibration.

Notes

Setting User Preset file is highly recommended when your configuration includes M9377A and M9378A modules. This can avoid occurring power unleveled error after every boot up.
Procedure
- When you restart the firmware, set start frequency and initial power level properly. Then use the setting as “User preset status” from Preset > User Preset…, and select Save current state as User Preset and check User Preset Enable.
Typical setting for each configuration:
- Configuration / Start frequency / Power
- STD / 50 MHz / 0 dBm
- DA / 50 MHz / 0 dBm
- WDR / 500 MHz / -15 dBm
- HP / 50 MHz / -30 dBm
- HG / 500 MHz / -35 dBm

Procedure

Required Equipment

50 Ω Termination (A 50 Ω Termination is equipped on the IF Out connector on M9376A and ATT out connector on M9378A at factory shipment. ) (This is optional for M9377A Direct Access Receiver configuration)
Power Sensor and Power Meter (Supported Power Meters, excepts 437B/438A) and a cable about 50 cm/20 inch for connection (This is optional for M9376A)
Mechanical Calibration Kits or ECal (3.5mm, frequency range:1 M to 9 GHz) (This is required for a combination of M9377A/M9378A.)

Using Hardkey/SoftTab/Softkey

Wait 45 minutes after power on for warm up
When a power sensor is used, execute the power sensor zeroing and calibration.
Confirm if the HiSlip is enabled and address is set at 0 by clicking System > System Setup... > Remote Control....
Press System > Service > System Power Cal...,

When your configuration does not include any M9377As:

Click Ok
Follow the instruction to complete the calibration.
The calibration takes about 30 to 40 minutes depending the installed module configuration.
Software Front Panel must be restarted after the calibration is done.

When your configuration includes M9377A:

Click Calibration button.
The System Power Calibration Dialog is displayed.
Confirm the installed module and port configuration for M9377A/M9378A. If the port configuration change is required, click Edit Config. button.
The required equipment is shown in the dialog.
Follow the instruction to complete the calibration.
The calibration takes about 30 to 50 minutes depending the installed module configuration.
Software Front Panel must be restarted after the calibration is done.

Note: If the system power calibration is aborted, restart the Software Front Panel.

When the system power calibration and port configuration (for M9377A/78A) is not performed on the current configuration, the one of following messages is displayed at power on.

Set configuration using Port config wizard. Port config data is not found and typical data of DA config is used.
Port conifig data was found but corresponded system power cal file is not found. Typical system power cal data is used.

When the configuration is changed such as the module is replaced, this message will be displayed again and required to execute port configuration and system power calibration.

Last modified:

18-May-2016

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