Connections For Sweep Operation; Setting Sweep Span And Markers - Metrix GX1010 Notice De Fonctionnement

combinations of sweep time and frequency span, see Frequency Stepping Resolution
section.
Sweep mode is turned on and off with alternate presses of the SWEEP key; the lamp
beside the key lights when sweep mode is on. The sweep parameters (begin, end and
marker frequencies, sweep direction, law, ramp time and source) are all set from the
sweep edit menu which is selected by pressing the blue EDIT key followed by the SWEEP
key. When sweep edit is selected the lamp beside the SWEEP key flashes to show edit
mode regardless of whether sweep operation is selected to be on or off. The sweep mode
parameters are set up on two pages of the display; the flashing edit cursor is moved
around each page, and between pages, by the FIELD and DIGIT keys as described in the
Principles of Editing section.
Return to the Main menu from either page of the edit menu is achieved by pressing the
ESCAPE key.
See also the Squarewave Generation section for information concerning the use of sweep
with squarewaves.

4.3.2. Connections for Sweep Operation

Sweeps are usually used with an oscilloscope or hard-copy device to investigate the
frequency response of a circuit. The MAIN OUT is connected to the circuit input and the
circuit output is connected to an oscilloscope or, for slow sweeps, a recorder.
To show the markers on the display instrument the rear panel TRIG/SWEEP OUT socket
should be connected to a second channel; an oscilloscope should be triggered off this
channel (negative edge) or the TRIG/SWEEP OUT can be connected directly to the
external trigger of the oscilloscope if no marker display is required.
The TRIG/SWEEP OUT socket provides a 3-level waveform in sweep mode. The output
changes from high (4V) to low (0V) at start of sweep and goes high again at end of sweep;
it can therefore be used as a pen-lift signal (inverted by the user if necessary) if the display
device is a chart recorder. Additionally the output provides narrow 1V pulses at each
marker frequency, see Setting Sweep Span and Markers section.
For externally triggered sweeps, a trigger signal must be provided at the front panel EXT
TRIG socket. A sweep is initiated by the rising edge of the trigger signal.
The generator does not provide a ramp output for use with X-Y displays or recorders.

4.3.3. Setting Sweep Span and Markers

Pressing the blue EDIT key followed by the SWEEP key displays the first page of the
sweep parameters with values set to factory defaults.
The BEGin, END, and MARKER frequencies can all be set or modified in exactly the same
way as described for the setting of the frequency in the Main Generator section. In
summary, with the cursor in the first field of any line, the DIGIT keys or rotary control will
alternate the display between FRQ= and PER=; with the cursor in the numeric field the
DIGIT keys will move the cursor within the field and the rotary control will change the value
in increments determined by the cursor position; with the cursor in the units field, the DIGIT
keys or rotary control will change the value in decade increments. Direct keyboard entries
(number plus units) will be accepted with the cursor anywhere in the line of the display.
Note that if sweep mode is actually on (selected by alternate presses of the SWEEP key)
and the ramp time is set to 200ms or less, then changing the BEGin or END frequency
causes the current sweep to be aborted, the frequency steps to be recalculated, and a new
22 - II
BEG FRQ=100·0000kHz
END FRQ=10·00000MHz
MARK FRQ=5·000000MHz
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GX1010