7.2. Error and Status Messages

The following are error and status messages that may be displayed by the M81-SSM during operation.

SCPI Error Messages

Critical startup errors:

The following are errors that may be displayed during startup. These errors are critical and will prevent the M81-SSM from functioning properly. Please contact Lake Shore Service for support see Technical Inquiries for more information.

Error

SCPI error code

Description

Invalid calibration

-340

The calibration is not valid. The data is either corrupt, uninitialized or default values.

NOVRAM not communicating

-320

Indicates that a NOVRAM device failed to initialize. See Summary of Internal Memory Devices for more information about memory devices.

Model ID not communicating

-300

Indicates that the device used to store the model ID failed to initialize.

Rev ID not communicating

-300

Indicates that the device used to store the revision ID failed to initialize.

Line frequency out of bounds

-300

Indicates the detected line frequency is out of normal operating range. A default value of 60 Hz is used.

ADC config corrupt

-300

Indicates that an invalid internal ADC configuration was detected.

Invalid channel card configuration

-300

Indicates that an invalid channel card configuration was detected. This typically indicates that an expected channel card was not detected.

Runtime errors:

The following are errors that may be displayed during operation. These errors are critical and will prevent the M81-SSM from functioning properly. Please contact Lake Shore Service for support see Technical Inquiries for more information.

Error

SCPI error code

Description

Overflow

-240

Internal data streaming buffer overflow. You can continue, but note that data loss has occurred during a data stream.

Measure module I2C corrupt

-240

Failed readback on the specified measure module I2C write.

Source module I2C corrupt

-240

Failed readback on the specified source module I2C write.

Head temp sensor failure

-240

Failed to communicate with the head board temperature sensor.

Measure module temp sensor failure

-240

Failed to communicate with the specified measure module temperature sensor.

Source module temp sensor failure

-240

Failed to communicate with the specified source module temperature sensor.

Master reference error

-240

The measured master reference voltage is out of bounds.

Source gain max correction

-240

Computed gain factor is out of bounds on the specified source module.

Source offset max correction

-240

Measured offset is too large on the specified source module.

Source DC gain max correction

-240

Computed gain factor is out of bounds on the specified source module’s DC chain.

Source DC offset max correction

-240

Measured offset is too large on the specified source module’s DC chain.

Measure gain max correction

-240

Computed gain factor is out of bounds on the specified measure module.

Measure offset max correction

-240

Measured offset is too large on the specified measure module.

Measure voltage nulling limit

-240

Input offset voltage is too large to correct on the specified measure module.

Measure current nulling limit

-240

Input bias current is too large to correct on the specified measure module.

Measure module JSON checksum

-230

Checksum validation of the specified measure module’s JSON NOVRAM data has failed.

Source module JSON checksum

-230

Checksum validation of the specified source module’s JSON NOVRAM data has failed.

Internal communication error

N/A

Internal communication between the instrument’s microcontrollers or hardware was interrupted. This typically occurs when a module is unplugged without first unloading it. See Module Loading for details on how to properly load and unload modules. When this error is encountered the instrument will attempt to re-estabilish communication. If it is able to do so, an option to continue will be presented ortherwise the instrument will need to be restarted.

Module connect errors:

The following are errors that may be displayed when connected modules are loaded. The module will not function until the error is corrected.

Error

Description

Read error

There was an error identifying the connected module.

Unrecognized module error

The connected module was identified, but is not supported with this firmware version. This can typically be resolved by updating the firmware.

Port direction error

The connected module was plugged into the wrong port. For example, a source module was plugged into a measure port. This can typically be resolved by plugging the module into the correct port type.

Measurement status messages:

The following are status messages that may be displayed during measurement. Readings may not be available when these messages are displayed.

Status

Description

Settling

The measurement is settling due to a hardware change.

Overload

The module is in an active overload.

Unlocked

The module’s lock-in amplifier is unlocked.

V Limit

The module is at its voltage limit.

I Limit

The module is at its current limit.

Self-calibration status messages:

The following are status messages that may be displayed during self-calibration.

Status

Description

In progress

The calibration is in progress. See specific step details.

Initializing step

Getting ready to run calibration.

Learning reference step

Measuring internal reference against external calibrator.

Measuring references step

Measuring internal reference voltage.

Calibrating source step

Calibrating specified source channel.

Calibrating measure step

Calibrating specified measure channel.

Voltage offsets step

Calibrating offset for specified voltage range.

Nulling current step

Calibrating offsets.

Nulling voltage step

Adjusting input offset voltage.

Self-calibration successful

Calibration completed successfully.