User Manual

ManualsBrandsAim TTi ManualsCycle CountersAim TTi TF960 Cycle counter 0.001 Hz - 6 GHz Manufacturer's standards (no certificate)

COUNT, RATIO or DUTY respectively, the 2

function printed above the key in blue; the selected

function is shown by the appropriate annunciator in the display.

FREQUENCY and PERIOD measurements are directly displayed in the appropriate units.

COUNT is a simple totalise function. The displayed value can be frozen with the HOLD key; the

count continues in the background. The count can be restarted (set to zero) using RESET, the 2

function of HOLD. When the count reaches the maximum of 9999999999, the next active edge

restarts the count from zero.

The WIDTH measurement can be set to measure either the High time (above the threshold) or

Low time (below the threshold) by choosing the appropriate polarity setting, see earlier Input A

Configuration Options section.

Selecting RATIO with the A input active shows the ratio of High time to Low time (RATIO H:L) or

vice-versa, according to the polarity setting. Low (inactive) time is calculated by subtracting the

measured High (active) time from the period.

Selecting DUTY shows the High time or Low time (depending on polarity setting) expressed as a

percentage of the total period.

Function Selection – B input

With Input B (80MHz – 3GHz) selected only the FREQUENCY and PERIOD functions can be

used; attempts to select WIDTH, COUNT or DUTY will be ignored by the firmware; the

annunciator will flash briefly to indicate that this is not a valid selection and the existing setting will

remain unchanged.

Selecting RATIO with Input B selected (by a long press on the PERIOD key) is valid, but sets the

instrument to a RATIO B:A mode (Frequency B : Frequency A), not RATIO H:L as described for

the A input. The ratio B:A is obtained by making simultaneous frequency measurements on the

two inputs and dividing the B result by the A result. The result of the calculation is as accurate as

the measurements. Each signal can be any frequency within the permitted range of the

respective input. If the ratio is so large that the decimal point cannot be shown on the display,

then the result is shown with six digits and an exponent.

Function Selection – C input

With Input C (2GHz – 6GHz) selected only the FREQUENCY and PERIOD functions can be

used; attempts to select WIDTH, COUNT, RATIO or DUTY will be ignored by the firmware; the

annunciator will flash briefly to indicate that this is not a valid selection and the existing setting will

remain unchanged. There is no RATIO capability with either of the other inputs.

Measurement Time

Measurement time is changed using the left ◄ and right ► MEASUREMENT TIME keys, the

selected time being shown by the appropriate annunciator in the display. With a suitable signal

connected to the selected input the Measure annunciator will flash in the display to indicate that

the signal has been detected; the Measure annunciator continues to flash until a true result for

that selected measurement time is displayed, at which point it stays on continuously. Further

display updates then show the running average of the signal behaviour over the last 0.3s (1

update every measurement), 1s (2 updates per second), 10s (1 update per second) or 100s (1

update every 2 seconds) depending on the selected measurement time. Note that if a 1s, 10s or

100s measurement time is selected, starting or restarting a measurement gives a true result with,

generally, 7 digits resolution after 0.3s, 8 digits after 1s, 9 digits after 10s and, finally, 10 digits

after 100s. The units and the decimal point position are automatically adjusted to give the result

in the most convenient units.

Pressing the HOLD key will freeze the displayed measurement and the Hold annunciator will

be shown; Hold is cancelled by a second press of the HOLD key. The measurement continues in

the background while Hold is selected.