882 Video Test Instrument User Guide (Rev A.35) 373
HRAT
Horizontal RATe
Class Format parameter setting - Video resolution
Description Sets the line frequency. Pixel rate is equal to HTOT multiplied by HRAT. Frame rate is
equal to HRAT divided by VTOT. Field rate is equal to SCAN multiplied by the frame rate.
The HRAT? query returns the current horizontal frequency setting.
Command syntax HRAT frequency
frequency
typical min = 1000 Hz (floating point accepted)
typical max = 130000 Hz (floating point accepted)
Query syntax HRAT?
Query response frequency in Hz (floating point returned)
Other required
commands
The FMTU command instructs the generator to use the new settings. The ALLU command
updates the hardware to the new settings and redraws the test image.
Example
HRAT 32768 // Set 32.768 kHz rate in buffer
FMTU // Update hardware to current buffer contents
or
HRAT 32.768E3 // Set a 32.768 kHz rate
FMTU // Update hardware to current buffer contents
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