Command

Description

Bandwidth

Sets the bandwidth of a UV-VIS channel.

BunchWidth

For UVD 340U only: Averages photodiode signals for 3D field acquisition.

CheckWavelength

Checks wavelength calibration, using a Holmium Oxide Filter.

LampIntensity

States the lamp intensity at 254 nm in counts/seconds. The value can be used as a comparison value to determine how much the lamp intensity decreased. This requires that the value be first measured when the lamp is new.

RefWavelength

Sets the reference wavelength.

RefBandwidth

Sets the reference bandwidth.

Command

Description

Drift

Reports the signal Drift.

UpperLimit

Determine the upper limit for the drift in [mAU/h]. The upper limit can be any value between 0.8 and 20.0. The default setting is 3.0.

Value

(Read-only) Reports the actual value (usually, this value is averaged over the last 5 minutes.): At the beginning (i.e., after installation of the pump), the value field is empty, indicating that no measurement has been performed yet. Chromeleon calculates the value as soon as a 1-minute segment has been measured and updates the value with each new segment. The value of the property does not change after the measurement and displayed under Preconditions.

DriftEquilibration

(Read-only) Reports drift whether equilibration was successful: Ok or NotOK.

DriftStatus

Reports the status of drift equilibration (read-only).

N/A

Equilibration was not yet performed.

Measuring

Equilibration is running but the amount of data is not yet sufficient to report a result.

Good

Equilibration is running or terminated. The values are within the specified limits.

NotReady

Equilibration is running. The current data is outside the specified limits.

Failed

Equilibration is completed. The result is outside the specified limits.

NotTested

The limit was set to 0, thus disabling drift checking.

Equilibration

(Read-only) Reports the overall status of equilibration.

Noise

Reports the Signal Noise.

UpperLimit

Determine the upper limit for the signal noise in [mAU]. The upper limit can be any value between 0.03 and 0.50. The default setting is 0.10.

Value

(Read-only) Reports the actual signal noise (usually, this value is averaged over 5 minutes. For more information, refer to Drift.Value above.

NoiseEquilibration

(Read-only) Reports whether noise equilibration was successful: Ok or NotOk

NoiseStatus

(Read-only) Reports the status of noise equilibration. For more information, refer to DriftStatus above.

Command

Description

LampAge

Indicates the lamp age (in hours).

LampIgnitions

Indicates the number of lamp ignitions.

MinLampIntensity

Enter the value for the minimum lamp intensity. If the lamp intensity is below this value, a warning is written to the Audit Trail.

SnapshotGetSpectrum

For UVD 340U only: Stores the current spectrum in a text file.

SnapshotResolution

For UVD 340U only: Defines the wavelength resolution for a UV spectrum that is recorded using the SnapshotGetSpectrum command
(Range: 0.1 to 20.0 nm).

SnapshotDirPath

For UVD 340U only: Defines the destination directory for a UV spectrum that is recorded using the SnapshotGetSpectrum command.

SnapshotGetBLSpectrum

For UVD 340U only: Saves the current spectrum as baseline spectrum. The baseline spectrum is always subtracted from the spectrum recorded with the SnapshotGetSpectrum command.

SnapshotClearBLSpectrum

For UVD 340U only: Clears the buffer for baseline spectrum that was recorded using the SnapshotGetBLSpectrum command.