Quantum Data 802R-PCI manual Calibrating frequency, To reduce all frequency errors to zero

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Calibrating frequency

All frequencies associated with the generator are derived from a common frequency reference, which can be calibrated using the rate calibration command RATC.

To reduce all frequency errors to zero:

1.Measure any convenient frequency from the generator using a very accurate frequency counter.

For example, measure the horizontal TTL separate sync frequency with the DMT0660 format loaded and the horizontal rate temporarily set to 100KHz. Do this by typing

FMTL DMT0660;HRAT 100E3;ALLU

on the command line and measuring the TTL horizontal sync frequency.

2.Divide the frequency that you expect by the frequency that you measure and enter that ratio using the RATC command.

For example, if you measure 99.9955782499875 kHz, when you expect 100.000000000KHz, then divide 100.000000000KHz by 99.9950002499875kHz and type

RATC 1.0000442194553987

This will raise all rates output by the generator and make them exact.

802R-PCI Video Test Generator User Guide (Rev A)

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Contents User Guide Page Contents Iv Chapter Getting Started To install the generator Installing generatorEGA connector Connector pin-outsVGA connector Installing VGM Using Video Generator ManagerTo install VGM Quick tour of VGMSelect Port dialog box, choose PCI Card, and then click OK Getting Started Operating Procedures To view system information Viewing system informationTo backup custom objects Installing firmware and gateware upgradesTo install a firmware update To install a gateware updateOperating Procedures To initialize generator Initializing the generatorCalibrating the generator How to calibrate generatorAbout self-calibration To calibrate the generatorCalibrating frequency To reduce all frequency errors to zeroTo download a bitmap image Downloading bitmap imagesAutomating generator Advanced tasksCreating video formats and images Operating Procedures Creating Test Sequences Overview To create a sequence using VGM Using VGM to create a test sequenceCreating Test Sequences To play a sequence Creating Test Sequences

802R-PCI specifications

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