Single voltage measurement – the toolbar button

The process behind this window (to be invoked by Single Voltage Measurement item of the Measurement menu or by pressing the above toolbar button) carries out a sophisticated powering and measurement sequence which is scheduled in 1 second time slots.

Power sources supply a constant drive for most of the 1 second slot as defined in the Set Measuring Parameters window. At the end of the slot the power sources may change for a 300 µsec period. Eight samples are measured on each enabled channel at this time. The displayed voltage and noise values are based on an extrapolation on the samples taken.

a)	b)

Figure 5-10: The Single Voltage Measurement window: a) value within the compensated voltage range, b) value out of the compensated range

DC radio button

When pushed in the power sources supply the same constant value for all the time, also during the 300 µsec measurement period.

Pulse radio button

When pushed in the power sources change to the opposite value during the 300 µsec measurement period. This enables measurements with separated powering and measurement conditions.

Details radio button

When pushed in the details of the measurement are shown, see Figure 5-11: binary values of the 8 samples considered as one measurement point (always averaged by the T3Ster software before evaluation) are shown. These values are useful to judge what the noise figure (see below) exactly means.

Figure 5-11: Display of details of a single voltage measurement

Brief radio button

Push this button in to return to the default display mode such as shown in Figure 5-10.

Ch field

The number of the measurement channel is shown.

Range field

A yellow bar on a blue background shows the value measured proportionately to the actual range and compensation. Red rectangles appear on the left or right of the bar indicating underflow or overflow conditions (corresponding to the LED indicators on the measurement units).

Binary value field

In this field coloured the range bar the binary reading of the AD converter of the channel is shown.

Noise field

The noise level derived from a bunch of 8 repeated measurements on the channel is shown in bits.

Voltage field

The calculated voltage on the channel is shown in volts.

Pause button

Press this button if you want to "freeze" the measurement display, see Figure 5-12.

Figure 5-12: The single voltage measurement "frozen".

Restart button

Press this button if you want to restart a "frozen" single voltage measurement.