41
Subject to change without notice
Note:
If the video fi lter is activated and the SPAN is too high,
„uncal“ is displayed by the readout, as the signal level(s)
do not reach their real height on the screen.
In case of measuring pulses, the video fi lter should not be
used.
AVERAGE
Pushbutton with associated LED – Pressing this pushbut-
ton switches this function and the associated LED on or off.
In Average mode, the spectrum recordings are continuously
calculated and displayed as arithmetic mean value. Some
functions cannot be called in AVERAGE mode and cause only
an acoustic error message.
When the AVERAGE LED lit, briefl y depressing the pushbut-
ton switches LED and function off and erases the previous
calculation result. AVERAGE also activates the Max. HLD
function (without displaying the result) to avoid waiting time
and enable direct switch over from AVERAGE to Max. HLD
(maximum hold).
Max. HLD
Pushbutton with associated LED – Pressing this pushbut-
ton switches the Max. HLD (maximum hold) function and
the associated LED on or off. Max.HLD stores and displays
the maximum level values of the spectrum; values below
the maximum get lost. In case of pulsating RF-signals the
signal reading should not be made until the maximum signal
height is present. Some functions cannot be called in Max.
HLD mode and cause an acoustic error signal.
When Max. HLD is activated and the associated LED lit,
briefl y depressing the pushbutton switches LED and function
off and erases the Max. HLD values. Max. HLD also activates
the AVERAGE
function (without displaying the result) to
avoid waiting time and enable direct switch over from Max.
HLD to AVERAGE mode.
LOCAL/PRINT
Pushbutton with two functions and associated LED.
LOCAL function
Remote mode can be switched on or off via the built in serial
interface. In remote condition the RM LED is lit and with the
exception of the LOCAL/PRINT pushbutton all other controls
are deactivated. Briefl y depressing the LOCAL/PRINT push-
button switches over from remote (RM) to LOCAL operation,
so that all controls become operative again.
PRINT function
On condition that the RM-LED is not lit (LOCAL mode), do-
cumentation via a PC printer can be started if the following
conditions are required:
1
st
The serial interface of the spectrum analyzer must be
connected with a serial PC (COM) port.
2
nd
The provided PC software must be activated and the soft-
ware COM port setting must comply with the hardware
connection.
B
Pushbutton – The spectrum analyzer contains a second
signal and parameter memory that is called „B“. This memory
is volatile and switching the instrument off will lose its con-
tent. Memory „B“ can only be activated with the instrument on,
after a spectrum has been previously stored by A→B-function;
otherwise an acoustic error message is audible.
Briefl y depressing the B pushbutton switches over to B dis-
play which is indicated by the readout (top left position) on
the right of the center frequency display.
A – B
Pushbutton – This function can be called only if a spectrum
has previously been stored in memory B. Then the result of
the actual recorded spectrum minus the content of memo-
ry B is displayed. On the right on the center frequency the
readout shows A - B.
The A–B-function eases the perceptibility of changes in
signal level, frequency and shape when adjustments are
made (if the previous setting had been stored in memory B).
When switching the A–B-function on, the reference level is
automatically changed for better reading. A manual correc-
tion overrides the automatic setting.
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 pressed, only the actual spectrum
is written into the memory, read and displayed. The letter
A indicates this state after the CENTER FREQUENCY infor-
mation in the readout.
RECALL/SET
Pushbutton with double function. – Note: The RECALL func-
tion cannot be activated as long as AVER AGE or Max. HLD is
present.
RECALL: The instrument has a memory for 10 instrument
parameter settings that can be called by this function.
Pressing 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
pushbuttons
can be used to select the memory location with ciphers
between 0 and 9. Each time the memory location setting is
changed by pressing the SAVE or RECALL pushbutton, the
(approx.) 2 seconds for the memory location display time
starts again.
SET (push long): Calling an 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 accept the settings from the selected me-
mory location to the front panel. The take over is acknow-
ledged by a double beep.
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 dis-
play is then switched off.
SAVE / SET
Pushbutton with double function. – Note: The SAVE func-
tion 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 instru-
ment 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
Controls and readout
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