Error Messages; Description Of Controls; Front Panel Controls - Toellner Toe 7704 Bedienungsanleitung

2.2.3 Error Messages

Test programs executed when the device is switched on,
or faulty operations on the device, may result in error
messages in numeric form. The error messages are
acknowledged either by pressing a permissible key or
by cancelling the error.
Switch-on errors
Illegal device status, e.g. following data
E. 01
loss because 7-day back-up period was
exceeded; the standard setting is made
Error in program memory (EPROM)
E. 02
Error in data memory (RAM)
E. 03
Error in sweep control logic
E. 04
Error in data memory (RAM) for sweeps
E. 05
Error in PLL control logic
E. 06
Error in memory for device-specific adjust-
E. 07
ment values (E
Operating errors
PLL frequency transfer from free-running
E. 10
mode only possible for f ≥ 10 Hz
Only function with positive or negative pul-
E. 11
ses permissible for PLL frequency settings
f ≥ 22 MHz
Only sine-wave, triangular-wave or square-
E. 12
wave functions permissible with AM mode

2.3 Description of Controls

The various controls and displays of the TOE 7704 to
TOE 7711A function generators on the front and rear
panels are shown at the end of the Instruction Manual
using the example of the TOE 7711A model which has
the maximum configuration. The individual controls are
explained in detail below.

2.3.1 Front Panel Controls

[1] key/LED
PLL
The operating mode PLL is selected when this key
is pressed, and a previously-selected frequency is
set with crystal accuracy. The frequency in the
display has a resolution of 4½ digits. The operat-
ing mode PLL is switched off either by pressing
the key again (switchover to free-running
PLL
generator mode) or by pressing one of the other
mode keys such as
by setting the function switch to DC/AMPL. The
key LED lights up when PLL is active.
[2] key/LED
FREQ
The current value of the generator frequency ap-
pears in the display when this key is pressed. The
key LED lights up. The frequency can now be set
using the knob MODIFY. Decadic frequency ad-
justments are possible using the RANGE
keys. The significance of the frequency value can
be marked using the CURSOR
be adjusted using the knob. The selected signify-
TOELLNER Electronic Instrumente GmbH
2
PROM)
, ,
SWEEP TRIGGER GATE
▲
key and then can
◄
cance flashes to identify the cursor position. The
INT/EXT
internal and external frequency measurements in
free-running generator mode and in PLL mode.
The frequency of the signal applied to the BNC
socket EXT IN is measured if the frequency
counter is in external mode.
[3] key/LED
STOP
The current value of the sweep stop frequency ap-
pears in the display when this key is pressed. The
key LED lights up. The desired stop frequency can
now be set using the knob MODIFY. Decadic fre-
quency adjustments are possible using the RANGE
/ keys. The significance of the frequency
▲ ▼
value can be marked using the CURSOR
and then can be adjusted using the knob. The
selected significance flashes to identify the cursor
position. Only effective in operating mode
SWEEP.
[4] key/LED
START
The current value of the sweep start frequency ap-
pears in the display when this key is pressed. The
key LED lights up. The desired start frequency can
now be set using the knob MODIFY. Decadic fre-
quency adjustments are possible using the RANGE
/ keys. The significance of the frequency
▲ ▼
value can be marked using the CURSOR
and then can be adjusted using the knob. The
selected significance flashes to identify the cursor
position. Only effective in operating mode
SWEEP.
[5] DISPLAY
Used in conjunction with the dimension LEDs to
display adjustable or measured operating parame-
ters such as frequency, period, voltage and gain.
Additionally indicates sweep modes and error
codes. The respective parameter is output on the
display by pressing one of the keys
,
START MODE
neath it.
[6] key/LED
MODE
The symbol for the currently set sweep mode ap-
pears in the display when the key is pressed. The
key LED lights up. The desired sweep mode can
now be set using the knob MODIFY. A linear or
logarithmic sweep can be selected in addition
using the
ing mode SWEEP. (description of the sweep
modes → 2.3.6).
or
[7] key/LED
PERIOD
The current value of the sweep or trigger/gate pe-
riod appears in the display when this key is
pressed. The key LED lights up. The desired pe-
riod can now be set using the knob MODIFY.
Decadic adjustment of the period is possible using
the RANGE
ing mode SWEEP, TRIGGER and GATE.
/
▼
[8] Dimension LEDs
Mark the dimension of the displayed operating
parameter.
key can be used to switch between
, ,
PERIOD AC/AMPL
key. Only effective in operat-
LIN/LOG
/ keys. Only effective in operat-
▲ ▼
◄ key
key
◄
, ,
FREQ STOP
and be-
DC
19