50
Subject to change without notice
Main Menu1 HM8131-2
*** MAIN MENU 1 ***
Sweep Arb Mode -->
** WORKING MODE **
Cnt Trg Gat Sync
** WAVEFORM SIZE **
4096 Pts 16384 Pts
* SWEEP PARAMETERS *
Start Stop Time
Lin
Mode Menu HM8131-2
** WORKING MODE **
Cnt Trg Gat Sync
** MULTI-DEV SYNC **
Master Pulse Slave
*** GATE CONTROL ***
* TRIGGER CONTROL *
pulse
Cnt: "Signal continuously
present at the output"
mode will be started with the parameters chosen. A detailled
description of the sweep mode can be found in chapter 5.3
”Sweep menu“.
STOP
Leaving the sweep mode is only possible by pres-
sing the SWP button again.
Output
The signal output has an impedance of 50 ohms. The button
Output
switches the output signal on/off including any
offset. In the off position the output will show an open circuit.
The LED adjacent to the button Output will indicate the status
of the output.
Due to residual crosstalk there is some signal feed-
through at high frequencies, typically the
HINT
attenuation will amount to appr. –60 dB at 1 MHz.
Do not apply any voltages to the output terminal,
this may destroy the output stage. The output is
short-circuit proof. External voltages up to ±15 V
STOP
STOP
for less than 30 sec will be tolerated.
Main menu 1 and its functions
(See drawing on page 51.)
Main menu 1
From main menu 1 three other menus are accessible. The
pushbutton below the arrow will call main menu 2.
Operating mode (working mode)
The HM8131-2 features various operating modes. The standard
mode is Cnt (continuous) or free-running. Trg designates the
triggered mode and Gat the gated mode. Several HM 8131-2
may be synchronized. The selected mode will be indicated with
a triangle in the left portion of the display.
STOP
Instruments are programmed for Cnt mode when
leaving the factory.
Free-running (Cnt)
The generator is freerunning with the frequency displayed, the
signal is continuously available at the output, provided the sweep
mode was not activated.
Trigger (Trg)
Pushing [Trg] will call the menu “TRIGGER CONTROL“. First + or
– slope is selected. The trigger signal is applied to the terminal
TRIG.INP
. By nature this mode is synchronous, upon receipt
of a trigger the output signal will start at zero. Depending on
the duration of the trigger signal one or more complete signal
periods will be generated, periods started will be always com-
pleted. This way also bursts can be generated.
STOP
The trigger mode is available for all signal func-
tions (waveforms) within their frequency limits. For
sine, square wave, triangle and arbitrary the upper
limit is 500 kHz.
A single signal period may also be triggered by
pushing “pulse“ while in the “TRIGGER CONTROL“
HINT
menu.
Triggering on the rising edge
The positive slope of the trigger will start the sine wave, the last
sine period will be completed after the negative trigger slope.
M a i n m e n u 1 a n d i t s f u n c t i o n s