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Optional Firmware for Frequency Counting

With the optional frequency counter ﬁ rmware (U1061A-FC1)

the digitizer can be used to perform real-time frequency

measurement at up to 400 MHz. For user selectable inter-

vals in the range 1 ms to 1,000 s the module will count the

number of triggers generated on the selected input signal,

in the range of 1 to more than 4 billion counts. From this

measurement, together with a small correction for the

actual trigger time, it is possible to extract the average fre-

quency, signal period, or the measured trigger count itself.

The option can also be used to total the number of triggers

up to 125 MHz, occurring during a user-deﬁ ned gate inter-

val as given by a hardware signal on a Ctrl I/O input.

Frequency measurement accuracy beneﬁ ts from the high

internal clock accuracy of the modules (±2 ppm) with

no additional requirement for any external reference. An

external reference source can also be used if even higher

precision is desired.

Figure 2: The U1061A digitizer uses

large-scale integrated circuit technology

to reduce size and power requirements.

This essential technology allows the

digitizer to deliver fast sampling rates and

high bandwidths in a 3U PXI/CompactPCI

package.

Figure 1: Digitizer mezzanine card.

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Agilent Technologies DC140 Manuale Utente Pagina 4