Front Panel Connections; Rear Panel Connections; Remote Control - Hameg HMS 3000 Handbuch

C o n n e c t i o n s / R e m o t e C o n t r o l

9 Front panel connections

9.1 USB connector
Using the front panel USB connector a software update of the
HMS firmware can be performed or screenshots can be stro-
red. Please use only FAT or FAT32 formatted mass memory
(chapter 8.6).
9.2 PHONE
The signal available at this connector comes from an AM de-
tector and it helps to identify the sources of interference e.g.
when making precompliance measurements. If an antenna is
connected to the analyzer input, selecting CENTER and using
the knob the analyzer can be tuned to a transmitter (Receiver
mode chapter 5.13). The demodulation has to activated. Please
note that this operational mode may be subject to national
restrictions!
9.3 PROBE POWER
This connector can be used as a supply (6 V
probes. The inner contact is +6 V, the outer contact is connected
to the instrument housing and thus with the measurement
inputs' ground potential and also protective earth (PE).
9.4 EXTERNAL TRIGGER
The external trigger input connector is used for the control of
measurements by an external signal. (TTL levels.)
9.5 OUTPUT 50Ω (Tracking Generator)
The tracking generator output (only HMS1010 and 3010) has
to be connected to the measuring object with a N connector
cable. A test signal with a spectrum from 5 MHz to 1 GHz resp.
3 GHz is available.
9.6 INPUT 50Ω
Without attenuation (ATT 0dB) ±25 V
With an attenuation of 10 to 50 dB, the maximum level is
+20 dBm. Levels or DC voltages above the values mentioned
may destruct the input stage. The outer contact is connected
to the instrument chassis and thus to safety ground (PE). The
maximum input levels resp. voltages must not be exceeded.
Danger of destruction!
52
Subject to change without notice
) e.g. for HAMEG
DC
must not be exceeded.
DC

10 Rear panel connections

10.1 USB connector
The USB interface on the rear panel can be used for a printer
(see chapter 8.4).
10.2 DVI connector
The rear panel of the spectrum analyzer also has the standard
DVI-D connector for the connection of external monitors or
projectors. The DVI-D connector can only provide digital signals.
Therefore, an analog connection of a projector is only possible
with use of an externally converter for DVI connections. The
HMS series delivers a DVI signal in VGA resolution (640x480).
Thus, any type of common TFT monitors can be connected.
Modern Flat Screens interpolate the signal so that you can see
a full screen.
10.3 REF IN / REF OUT
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 specifications given with respect to frequency
accuracy and amplitude.
The switching between internal and external reference fre-
quency can be effected via the button SETUP and the softkey
REF. FREQUENCY.

11 Remote Control

The HMS 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 systems. A detailed instruction how to setup a basic
communication using HyperTerminal is available at the HAMEG
Knowledge Base at http://www.hameg.com/hyperterminal.
The HMS series uses SCPI (= Standard Commands for Pro-
grammable 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 func-
tions which are available on the front panel. A detailed document
about the provided SCPI commands is available at http://www.
hameg.com.