User manual

ManualsBrandsROHDE & SCHWARZ ManualsLaboratory Test EquipmentDigital HMO1002 50 MHz 9-channel 1 null 1 null Digital storage (DSO), Mixed signal (MSO), Function gen

Vertical System

4 Vertical System

You can select vertical set-

tings using knobs for the

vertical position and the

sensitivity. You may also use

a menu that is permanently

displayed as well as an ad-

vanced menu. You can select

for which channel you want

the settings to be activated

by pressing the respective

channel key. Once a channel

has been activated, the key

will be marked by a colored

LED light. Additionally, the

screen display will include a

frame around the activated

channel with a frame and a

color brighter than that of deactivated channels. The cor-

responding short menu is always visible and you can push

the Menu

key to activate the advanced menu.

4.1 Coupling

Theanalogchannelshaveaninputimpedanceof1MΩ.

The user determines if DC coupling or AC coupling is to be

used. With DC coupling, the DC voltage of the signal will

be displayed. With ACcoupling,aninputlterof2Hzsup-

presses the display of DC voltage. Signals of up to 100 V

(peakvalue)maybeconnecteddirectlyto1MΩinputs.

Higher voltages can be measured with external probes (up

to 40 kV peak voltage). This should only be used with DC

coupling. For all general applications, the probes HZ154

(1:1 / 10:1) supplied with the instrument will be used. You

can set the coupling using the short menu or channel

menu. Simply press the respective soft menu key to set

the coupling and the graphic inversion of the input chan-

nel. The menu applies to the corresponding active channel.

The illuminated channel key indicates which channel is

active. You can switch between channels by pressing the

respective channel key.

Fig. 4.2: Short menu for vertical settings

4.2 Sensitivity, Y Positioning and Offset

You can select the sensitivity of the analog inputs by using

the knob in the VERTICAL section (VOLTS/DIV) in 1-2-5

steps of 1mV/div to 10V/div. The knob is associated with

the active channel (push the respective channel key to

activate the desired channel). Pushing the knob once will

switch to a continuous sensitivity setting. You can use the

smaller knob in the VERTICAL section (POSITION) to de-

termine vertical settings for the active channel. Press the

MENU key to access advanced options.

On page 2|2 of this menu, you can add a DESKEW. To

activate this offset push the corresponding soft menu key.

You can set the offset value using the universal knob or

the KEYPAD key in the CURSOR/MENU section. Each ana-

log channel may be shifted in time by ±15 ns. This deskew

setting is used to compensate different signal delays when

using different cable lengths or probes.

4.3 Bandwidth Limit and Signal Inversion

Both the short menu and the advanced menu enable you

to insert an analog 20 MHz lowpassltertothesignal

path. This will eliminate all higher frequency interfe-

rence.Toactivatethelterintheshortmenu,pressthe

respective soft menu key BWL. In the advanced channel

MENU the bandwidth limit will be set with the soft menu

keyBANDWIDTH.Oncethelterisactivated,themenu

itemwillbemarkedinblue,andtheidentierBWwillbe

displayed in the channel information window.

Signal inversion is available in the short menu and the ad-

vancedmenuintheVERTICALsection.Anactivatedlter

will be indicated in blue in the menu and by a bar above

the channel name in the channel name window.

4.4 Probe Attenuation and Unit Selection

(Volt/Ampere)

The R&S®HMO1002 does not includes an integrated

probe attenuation detection. You can manually set the

attenuation factor in the advanced MENU in the VERTICAL

section.Thisispossiblewiththepredenedstepsx1,x10,

x100, x1000 or, using the universal knob or the KEYPAD

key,asdenedbytheuserfromx0.001tox1000.

In this menu, you can also select the unit Ampere in case

you are using a current probe. If you select the unit Am-

pere (A), the menu shows the most common factors (1V/A,

100mV/A, 10mV/A, 1mV/A). You may also use the USER

setting to select any given value. This setting may also be

used to measure the voltage via shunt. All measurements

are always displayed with the correct unit and scale.

4.4.1 Probe Compensation

You can perform the probe compensation via compen-

sation wizard or manually. To open the wizard, press the

Make sure to align passive probes prior to their rst use, after an

extended measurement break, or when switching instruments or

channels.

Fig. 4.1: Control panel for the

vertical system