User manual

ManualsBrandsUnbranded ManualsLaboratory Test EquipmentDigital Rohde & Schwarz HMO 724 70 MHz 12-channel 1 null 1 null 8 Bit Digital storage (DSO), Mixed signal (MSO), Spectr

Measurements

PEAK VALUES: This mode provides two cur-

sors to measure the minimum and the maxi-

mum voltage of a signal within the interval set

by using both cursors. The values Vp- and Vp+

correspond to the minimum and the maximum voltage.

The peak value (Vpp) corresponds to the amount of vol-

tage between the minimum and maximum value.

RMS, MEAN, STANDARD DEVIATION: This

mode provides two cursors to measure the ef-

fective value (RMS – Root Mean Square), the

mean value and the standard deviation within the interval

set by using both cursors.

DUT Y RATIO: This mode provides three cur-

sors to determine the duty ratio between the

two horizontal cursors. The third cursor is

used to specify the threshold at which the duty ratio is

measured.

RISE TIME 90%: This mode provides two cur-

sorstomeasuretheriseandfalltimeoftherst

rising slope in the displayed view of the screen

within the time span set by the cursors. The rise time iden-

tiesthetimeinwhichthesignalrisesfrom10%to90%of

its amplitude.

RISE TIME 80%: This mode provides two cur-

sorstomeasuretheriseandfalltimeoftherst

rising slope in the displayed view of the screen

within the time span set by the cursors. The rise time iden-

tiesthetimeinwhichthesignalrisesfrom20%to80%

of its amplitude.

V-MARKER: This mode pro-

vides two cursors to measure

three different voltages and a

time. The values V1 and V2 correspond to the voltage bet-

ween the zero base line of the selected curve and the cur-

rentpositionoftherstorsecondcursor.ThevalueΔV

corresponds to the amount of voltage between the two

cursors.ThevalueΔtcorrespondstotheamountoftime

between the two cursors.

To move cursors, press the universal knob in the CURSOR/

MENU section and position the cursor by turning the univer-

sal knob. The measurement types have the following func-

tions. The measurement results are displayed at the bottom

of the screen. If “n/a” is displayed, the measurement is not

applicable to the signal. For instance, this may be the case

for a voltage measurement on a POD because only logic sta-

tes without voltage reference are displayed here. If “?” is dis-

played, the display does not show a complete measurement

result. For instance, the period to be measured may not dis-

playcompletelyandcanconsequentlynotbeidentied.

If the function AUTOM. SOURCE is activated (ON), the

currently targeted channel will be used as source for the

measurement automatically. If the setting is deactiva-

ted (OFF), the channel set under SOURCE will be applied

even if it is not targeted. Pressing the soft menu key SET

TO TRACE places the selected cursors in their optimal po-

sition on the signal curve. This allows very fast and typi-

cally optimal automatic positioning of the cursors. For the

mostpart,onlynetuningisrequiredatthispointandthe

tedious major adjustments to the cursors will no longer be

necessary. In case the automated function SET TO TRACE

does not provide the anticipated results due to complex

signals, you can press the key SET TO TRACE to posi-

tionthecursorsinapredenedstartingposition.Thisal-

lows you to return distant cursors to the screen. The soft

menu key GLUE TO TRACE allows cursors to stay on the

selected data point without changing the position in the

measurementsignalevenifthescalingismodied(cur-

sors will be „glued“ to the signal). This function can be ac-

tivated or deactivated. If this mode is deactivated, the cur-

sor stays in position on the screen if scaling occurs. With

GLUE TO TRACE deactivated, the measured value changes

whileitremainsunmodiedwhenthemodeisactivated.

The cursors will be deactivated by pressing the CURSOR

MEASURE key. The cursor menu will be closed.

8.2 Automatic Measurements

The R&S®HMO1002 features cursor measurements and

also various automatic measurements. These may be acti-

vated by pressing the key AUTO MEASURE

in the sec-

tion ANALYZE. This menu allows you to select up to six

automatic measurement functions by using the soft menu

key MEAS. PLACE and the universal knob in the CURSOR/

MENU section. Following automatic measurement types

can be selected:

MEAN VALUE: This mode measures the mean

value of the signal amplitude (Mean). If the sig-

nalisperiodic,therstperiod on the left of the

screen will be used for the measurement. The measure-

ment will only be applied to the selected channel.

Fig. 8.1: Cursor measurements selection menu