Specifications

11
Subject to change without notice
The integrated help function can be activated by pressing the
key HELP in the GENERAL area of the control panel. A window
will open and the text inside is dynamically updated depending
on the key (including softmenu key’s) you are pushing or the
knob you are turning. If you do not need the help anymore, you
can switch off the help window by pushing the “HELP” key. The
backlight of the key and the text window will be switched off.
2.8 BusSignalSource
The HMO2524 series features 4 contacts left of the channel 1
which provide the following signals according to the respective
settings:
– Square wave signal for probe compensation (standard set-
ting), frequency 1 kHz or 1 MHz.
– SPI signal, data rates 100 kbits/s, 250 kbits/s or 1 Mbits/s
– I
2
C signal, data rates 100 kbits/s, 400 kbits/s or 1 Mbits/s
– UART signal, data rates 9600 bits/s, 115.2 kbits/s or 1 Mbits/s
– parallel stochastic bit pattern, frequency 1 kHz or 1 MHz
– parallel counter signal, frequency 1 kHz or 1 MHz
The contact at the top left is always ground, the signal levels
are around 1 V.
The following table shows the use of the 4 outputs S1, S2, S3
and (square wave) corresponding to the signal.
Signal S1 S2 S3
Square
wave
no signal no signal no signal Square wave
SPI
Chip select
low active
clock,
rising edge
data,
high active
no signal
I2C no signal clock SCL data SDA no signal
UART no signal no signal data no signal
Pattern bit 0 bit 1 bit 2 bit 3
Counter bit 0 bit 1 bit 2 bit 3
Press the key SETUP in the general area of the front panel for
entry into the bus signal source menu, select the page 2 and
press the soft menu key next to PROBE COMP. Now you can
select the operational mode for the bus signal source. For each
mode a picture with the corresponding pattern of signals on
the contacts is displayed. Pressing a soft menu key will open a
submenu for choosing the speed of the mode selected.
The square wave signal for probe compensation is available with
1 KHz for the low frequency compensation and with 1 MHz for
the high frequency compensation, also AUTOMATIC (standard
setting) may be selected. In the automatic mode, the output will
provide 1 KHz at sweep speeds from 100 µs/div, at faster sweep
speeds 1 MHz will be available.
These signals allow to learn and check the settings for the
parallel and optional serial bus analysis.
2.9 Updatesfortheinstrumentsettingsand
interfacermwareandthehelpfunctions
The HMO series is being improved continuously. You are invi-
ted to download the most recent rmware under www.hameg.
com/hmo3524. Firmware and help are packed into one ZIP
data packet. After downloading the ZIP data unpack it into an
USB stick’s basic directory. Thereupon insert the stick into the
USB port of the oscilloscope and push the key SETUP in the
GENERAL area of the front panel. Choose page 2 in the menu,
if this has not been opened already. Here you shall nd the
menu item UPDATE. After selecting this menu item a window
will open which displays the actual rmware version indicating
the version number, the date and build information.
Fig: 2.11: Updating menu and information window
Now choose which to update: the rmware or the help function.
If both are to be updated it is recommended to rst update the
rmware. After you selected rmware updating by pushing
the appropriate key the respective date will be searched on
the stick, the information of the rmware to be updated from
the stick will be displayed below the line NEW. In case the new
rmware should be identical to the existing one, the number
of the version will be shown in red, otherwise it will be shown
in green; only then should you activate the updating by pushing
the soft key EXECUTE.
If you intend to update the help function or add a help language
choose HELP in the updating menu.
The information window will now display the languages instal-
led, the date, and the information about the languages available
on the stick. With the soft menu, languages may be added,
removed or updated. Please note the format of the date:YYYY-
MM-DD according to the multi language norm of ISO 8601.
2.10 Upgradewithsoftwareoptions
The HMO may be upgraded with options which will become
accessible after inputting a licence key.
At this time, the option HOO10 is available which allows trig-
gering and decoding of the serial buses I
2
C, SPI, UART/RS-232
on the digital channels (with option HO3508).
The licence key will be sent to you by email as an appended data
le (name: SERIAL NUMBER.hlk). This le is an ASCII le and
may be opened with an editor, then the true key can be read.
There are two methods for employing the key to use the desired
option: the automatic or the manual input.
The fastest and simplest method is the automatic input: rst
store the le on an USB memory stick, then install the stick
into the front panel FRONT USB port of your HMO and press
the key „SETUP“ in the „General“ area of the HMO front panel.
The „SETUP“ menu will open. Select page 2 by pressing the
respective soft menu key, the following menu will open:
Introduction