Hameg Instruments HM5014-2 Manual Del Usuario página 32

C o n t r o l s a n d r e a d o u t
SAVE / SET
Pushbutton with double function.
Note: The SAVE function cannot be activated as long as AVERAGE or
Max. HLD is present.
SAVE: This function allows you to store up to 10 instrument settings
in a non volatile memory, which can later be called by RECALL. This
allows you to quickly call repeated instrument settings.
Pressing the SAVE pushbutton calls the function so that e.g. "Save5" is
displayed by the readout where the SPAN was indicated before. As long
as "Save ..." is displayed (approx. 2 seconds) the SAVE and the RECALL
pushbuttons can be used to select the memory location with ciphers
between 0 and 9. Each time the memory location setting is changed
by briefl y depressing the SAVE or RECALL pushbutton, the (approx.) 2
seconds for the memory location display time starts again.
SET (push long): Saving the instrument setting fi rst requires that the
memory location be displayed, which is called by briefl y pressing the
pushbutton. Pressing and holding the pushbutton while the memory
location is displayed causes the instrument to save the instrument
settings in the selected memory location. The take over is acknowledged
by a double beep.
Function break off: After approx. 3 seconds waiting time the SAVE
function is left automatically if it has been called inadvertently or not
used. The „Save.." memory location display is then switched off.
A→B
Pushbutton
When the readout displays the letter A at the right of the center fre-
quency, the actual spectrum present at the input is displayed. After
processing the spectrum is digitized stored into A memory, converted
back to analog and displayed on the screen.
Pressing the pushbutton A→B stores the contents of memory A into
the B memory and additionally switches over to display the content of
memory B. The readout now indicates the letter B in the position where
previously A was shown.
After the actual spectrum has been transfered from memory A to B
the transfered signal is displayed continuously (without change) until
switching either to memory A
to be displayed) or A–B (where the actual input spectrum minus the
memory B content is shown). The spectrum in memory B is lost after
turning off the instrument.
SPAN
Pushbuttons
The pushbuttons allow you to increase (upper pushbutton) or reduce
(lower pushbutton) the SPAN. It can be selected in a 1-2-5 sequence
between 1 MHz and 1000 MHz (full span) and defi nes the start and stop
frequency in combination with the center frequency setting.
Example: In combination with a center frequency of 300 MHz and a span
of 500 MHz, the start frequency (trace start, left) is 50 MHz (300 MHz
– Span/2) and the stop frequency (trace end, right) is 550 MHz (300 MHz
+ Span/2).
Note:
The instrument has been programmed to optimize the sweep time,
considering the span, resolution bandwidth (RBW) and video fi lter (VBW).
If not possible the readout shows UNCAL to indicate that the spectrum
level values are incorrect.
32
Subject to change without notice
(causing the actual input spectrum
ZERO SPAN
Pushbutton
Pressing this pushbutton switches this mode on or off. In order to exit
ZERO SPAN, by pressing one of the SPAN pushbuttons, the instrument
will return to the SPAN selected before entering ZERO SPAN.
In ZERO SPAN mode the readout shows ZERO-SP instead of the SPAN
setting. This mode enables measurement on a discrete frequency that
is determined by the center frequency setting. ZERO SPAN can also be
turned off by pressing one of the SPAN
INPUT 50 Ω
N-socket
Measurement input, max. 25 V
DC
attenuator set to –40 dB the maximum input HF-signal is +20 dBm.
Higher levels may destroy the input stage.
The N connector is directly connected to the chassis and thus with the
safety earth of the power plug!
PHONE
Headphone output connector, Ø 3.5 mm
This output is destined for headphones with an impedance of ≥8 Ω. The
volume can be varied with a screwdriver using the VOL. control.
The signal at this socket originates from the AM demodulator and
eases the identifi cation of signals. E.g. If an antenna is connected to the
spectrum analyzer input in ZERO SPAN mode, the instrument can be
tuned to a discrete transmitter frequency. Please consider that using
this function must be within the limits of the law.
TEST SIGNAL
BNC socket with pushbutton and associated LED
Even if the LED is not lit, the BNC socket serves always as a broadband
signal source with many spectra even though the 48 MHz signal is
absent. It can be connected to the spectrum analyzer input via a 50 Ω
cable and used for function check of the input.
If the output is switched on (LED lit) a 48 MHz signal with a level of approx.
–30dBm is additionally connected to the test signal output. Please note
„Test Signal Display"!
TRACKING GENERATOR
N-socket and OUTPUT pushbutton with ON LED
For protection of devices connected to the tracking generator it is
always in off condition after switching the instrument on. This state is
indicated by the letter "t" displayed by the readout and the LED is not
lit. Depressing the pushbutton switches the tracking generator on, the
LED lights, and the readout now displays the capital letter "T" in front
of the tracking generator level. Depressing the pushbutton once again
switches the tracking generator off.
A sine wave output signal is provided at the N socket with a source im-
pedance of 50 Ohm. The sine wave signal frequency is always identical
to the spectrum analyzer receiving frequency.
PROBE POWER
The jack has a diameter of 2.5 mm and may be used only for supply of
HZ530 near fi eld probes. The inner connector (+6 V) and outer connector
(galvanically connected with Protective Earth) can supply a maximum
current of 100 mA.
pushbuttons.
resp. max. +10 dBm HF. With the