Hameg Instruments HM5012-2 Handbuch Seite 37

(19) A – Pushbutton
The spectrum analyzer contains 2 memories named „A"
and „B". The memory „A" content is the actual signal at
the spectrum analyzer input that is continuously refreshed.
When the „A" pushbutton is briefly depressed, only the
actual spectrum is written into the memory, read and
displayed. The letter „A" indicates this state after the
CENTER FREQUENCY information in the readout.
ZERO SPAN A B A AVERAGE
SAVE B M a x
SET
A - B
SPAN RECALL LOCAL/PRINT
SET R M
24 22 20 19 17
18
23 21
(20) RECALL – SET - Pushbutton with double function
1. RECALL:
The instrument has a memory for 10 instrument
parameter settings that can be called by this function.
Briefly depressing the RECALL pushbutton calls the
function so that e.g. „Recall9" is displayed by the readout
where the SPAN was previously indicated.
As long as „Recall .." is displayed (approx. 2 seconds) the
RECALL and SAVE (21) pushbuttons can be used to select
the memory location with ciphers between 0 and 9. Each
time the memory location setting is changed by briefly
depressing the SAVE or RECALL pushbutton, the (approx.)
2 seconds for the memory location display time starts
again.
Note:
The RECALL function cannot be activated as long as
AVERAGE or Max. HLD is present.
Function break off:
After approx. 3 seconds waiting time the RECALL function
is left automatically if it has been called inadvertently or
not used. The Recall memory location display is then
switched off.
2. SET:
Calling an instrument setting first requires that the
memory location be displayed, which is called by briefly
pressing the pushbutton. Pressing and holding the
pushbutton while the memory location is displayed,
causes the instrument to accept the settings from the
selected memory location to the front panel. The take
over is acknowledged by a double beep.
(21) SAVE – SET - Pushbutton with double function
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.
1. SET:
Briefly depressing 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 (20) pushbuttons can be used
Subject to change without notice
VBW 5dB/DIV
kHz
4
. H L D
dB
kHz
0
10
1000
RBW AT TE N
120 20
9 30
40
14 12 13
16
15
to select the memory location with ciphers between 0
and 9. Each time the memory location setting is
changed by briefly depressing the SAVE or RECALL
pushbutton, the (approx.) 2 seconds for the memory
location display time starts again.
Note:
The SAVE function cannot be activated as long as AVERAGE
or Max. HLD is present.
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
0 dB
switched off.
.
2. SAVE:
Saving the instrument setting first requires that the
10
memory location be displayed, which is called by briefly
11
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.
(22) 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 1MHz and 1000MHz (full
span) and defines the start and stop frequency in
combination with the center frequency setting.
Example: In combination with a center frequency of
300MHz and a span of 500MHz, the start frequency
(trace start, left) is 50MHz (300MHz – Span/2) and the
stop frequency (trace end, right) is 550MHz (300MHz +
Span/2).
Note:
The instrument has been programmed to optimize the
sweep time, considering the span, resolution bandwidth
(RBW) and video filter (VBW). If not possible the readout
shows „uncal" to indicate that the spectrum level values
are incorrect.
(23) A → → → → → B - Pushbutton
When the readout displays the letter „A" at the right of
the center frequency, the actual spectrum present at the
input is displayed. After processing the spectrum is
digitized stored in memory „A", converted back to analog
and displayed on the screen.
Briefly depressing the pushbutton „A → B" stores the
memory „A" contents into memory „B" 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 transferred from
memory „A" to „B" the transferred signal is displayed
continuously (without change) until switching either to
„A" (15) (causing the actual input spectrum 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 switching the
instrument off.
Controls and readout
37