Sweep Mode (Sweep); Burst Mode (Burst); Menu Options (Menu); System Settings - Hameg HMF2525 Handbuch

The selected function will be indicated in the lower menu fi eld.
The values of the parameters are set using the numerical key-
4
board , the knob or the arrow keys
10
The modulation type frequency shift keying (FSK) generates a
signal which alternates between two predefi ned frequencies: the
carrier and the leap frequency. The alternation will depend on
the FSK rate set in the internal source mode or on the signal at
the trigger input TRIG INPUT in the external source mode. Both
carrier and leap frequencies may be set entirely independent of
each other. The setting of the individual parameters is perfor-
med via the numerical keyboard, the knob or the arrow keys

5.2 Sweep mode (SWEEP)

In the sweep mode the start frequency will be increased in
steps within a given sweep time (SWEEP time) up to a preset
stop frequency. In case the stop frequency was chosen higher
than the start frequency the sweep will run from the higher to
the lower frequency. The center frequency and the span are
directly related to the start and stop frequencies. Additionally,
linear or exponential sweep can be chosen. The socalled marker
frequency must be set between the start and stop frequencies.
If the signal frequency reaches the marker frequency a signal
will be generated available at the TRIG OUTPUT connector.
The sweep function can not be combined with the
gating function.
The sweep mode is selected by pushing the SWEEP key which
will light up. The parameters sweep time, start and stop fre-
STOP
quency can be set independently.
The sweep parameters are set via the numerical keyboard, the
knob or the arrow keys. Setting or changing of parameters are
also possible during a sweep, any changes will be immediately
apparent. The sweep actually running will be terminated and a new
one started; the display will show the parameters activated.
The sweep function will be left by pushing the
SWEEP key again.
The sweep time is selectable from 1 ms to 500 s. A sweep signal
may also be triggered, this can be selected with the soft keys. In
STOP
triggered mode the HMF2525 / HMF2550 will generate the start
frequency and wait for the trigger in order to start a sweep. The
sweep will run with the parameters selected and stop, waiting
for the next trigger.

5.3 BURST mode (BURST)

The BURST mode is available for each waveform, also for any
symmetry setting. If this mode is chosen the white LED of the
BURST key will light up. In BURST mode these selections are
available:
– triggered (internal/external)
– gated (GATED externally)
In the triggered BURST mode a trigger will generate a burst
with a predefi ned number of cycles. Such a n-cycle burst begins
and ends at the same point of the signal which is called start
phase. A start phase 0º equals the beginning and 360º the end
of the waveform defi ned. If the burst counter was set to infi nity,
a continuous waveform will be generated upon a trigger. The
trigger source may be an external signal, an internal clock
signal or a remote command. The trigger input for an external
signal is the TRIG INPUT connector on the front panel. The
17
9
.
Fig. 5.3: Example for burst mode
logic signal applied is referenced to the instrument case which
is ground potential.
In gated BURST mode (GATED), the signal will be either on or
off, depending on the level of the external signal at the „Trigger
input/ouput" connector. If the gate signal is „true", the function
generator will deliver a continuous signal, if the signal is „false",
the output signal will stop as the function generator will stop
generation. The output level will correspond to the start level
of the waveform selected.
The soft keys are used for the BURST mode settings, if they are
active their blue LEDs will light up.

5.4 Menu options (MENU)

The menu will be called by pushing the MENU key
light up white. The interactive soft keys
following options. After selecting a menu option the knob
or the arrow keys
A selection is performed resp. confi rmed by pushing the knob.
If the respective soft keys of the option are active, their blue
LEDs will light up.

System settings

These are general informations about the instrument such as
fi rmware version, date of the last update, date of the last ca-
libration. RESET will revert all settings to the factory settings,
hence all settings by the customer will be erased. Here also the
impedance of the output (50 ohms or open circuit) and internal
or external clock can be selected.

Firmware update

A Firmware-Update can be done with an USB-Stick:
1. Please download the latest fi rmware from our website
2. Plug the USB-Stick into the USB-interface in front of the
3. Please press the key MENU
STOP
E x t e n d e d o p e r a t i n g m o d e s
9 are used to move around in the submenu.
http://www.hameg.com and save this fi le on a USB-Stick
into the root folder.
HMF.
or with the arrow key's
10 9
The update process starts with pressing the knob.
Attention! At the time of the update the unit will not
respond on any inputs and the display will be resettet.
Does not switch off the unit during the update pro-
cess. A interruption of power supply can destroy the
unit!
Subject to change without notice
8 which will
3 allow to select the
10
and choose with the knob
8
the menuepoint UPDATE.
29