Front Panel Connections; Modulation Input; Sweep Out; Ref Out/Ref In - Hameg HMF2525 Handbuch

F r o n t p a n e l c o n n e c t i o n s

8 Front panel connections

Fig. 8.1: Signalinputs and –outputs including
modulation input at the rear panel

8.1 Modulation input

The HMF2525 / HMF2550 allows to control the amplitude of the
output signal by an externally applied dc voltage to the MODU-
LATION INPUT connector : a voltage from 0 to +5 V will reduce
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the output amplitude to zero.

8.2 Sweep out

The sweep sawtooth is available at the BNC connector SWEEP
OUT on the rear panel, the signal runs from 0 V (start fre-
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quency) to +5V (stop frequency). For further information about
the SWEEP function consult the section „Extended operating
functions".
Fig. 8.2: Swept sine wave; sawtooth output

8.3 REF OUT/REF IN

In order to further increase the frequency stability, the internal
oscillator may be replaced by an external one which can be
connected to the „10 MHz REF IN/REF OUT" connectors
on the rear panel. The external reference frequency signal must
comply with the specifi cations given with respect to frequency
accuracy and amplitude.
Push the MENU key 8 and select System Settings and CLOCK
in order to select an external reference.
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Subject to change without notice

9 Remote Control

The HMF series is basically supplied with an USB/RS-232
interface. The respective drivers are available on the enclosed
Product CD or can be downloaded at http://www.hameg.com.
To establish a basic communication a serial cable (1:1) as well
as a terminal program like Windows HyperTerminal is required.
The Windows HyperTerminal program is part of any Windows
operating system (Windows Vista not). A detailed instruction
how to setup a basic communication using HyperTerminal is
available at the HAMEG Knowledge Base at http://www.hameg.
com/hyperterminal.
If the instrument is being addressed via the interface (remote con-
trol), the LED of the Remote button
the Remote button in order to return to local control.
The HMF2525 / HMF2550 uses SCPI (= Standard Commands
for Programmable Instruments) for remote control. Remote
control is possible via the built-in dual interface USB/RS-232
(options: Ethernet/USB, IEEE-488). This allow access to nearly
all functions which are available on the front panel. A detailed
dokument about the provided SCPI commands is available at
http://www.hameg.com.
/
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will light up white. Press
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