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sens opposé à celui des aiguilles d'une montre = CCW) ou vers la droite (dans le
sens des aiguilles d'une montre = CW). Les courbes en résultant sont à reprendre au
tableau.
Veuillez noter, que par la modification de la symétrie les fréquen-
ces se modifient et doivent être réajustées.
Ajustage de la fonction de wobulation avec largeur de bande et vitesse de
wobulation (balayage)
Afin d'activer le wobulateur de fréquences incorporé (Sweep), tirez le bouton de
réglage "SWEEP WIDTH" et vous modifiez ainsi la largeur du signal de wobulation
avec ce bouton dans la plage 100:1. Pour atteindre le maximum de la largeur, tour-
nez le bouton d'ajustage de la fréquence (avec graduation) jusqu'en butée à gauche
et le régulateur de largeur jusqu'en butée à droite.
Pour modifier la vitesse du signal de wobulation, tournez lentement le bouton de
réglage SWEEP RATE
vers la gauche respectivement vers la droite. Vous obtenez un signal de wobulation
linéaire. Un signal de wobulation logarithmique devient possible en tirant le bouton
de réglage SWEEP RATE.
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Operating the frequency counter
With the "FC/FG" changeover switch set to "FG" the frequency counter indicates the
generator frequency, and with the "FC/FG" changeover switch set to "FC" indicates
external frequencies. For the measurement of external frequencies one of two inputs
can be selected with the "CHAN" button: channels "A" and "B". Using the "FREQ"
buttons, the period of a frequency can be displayed according to the formula t = 1/f
(where t = period, f = frequency,)
Never exceed the maximum input amplitude(s).
Measure only signal voltages which are electrically isolated from
the AC power supply.
The amplitude may not exceed 3 V pp into channel "B" or 35 V into
channel "A".
Selecting the Low Pass „LPF-A"
For measuring frequencies lower than 300 KHz, press „LPF-A" to avoid high-fre-
quency. If the lowpass function is on, „LPF-A" is indicated on the display.
Selecting the input channel
Depending on in which frequency range measurements are to be carried out, select
either channel "A" or "B" by pressing the button "CHAN".
In the channel "A" position, frequencies from 1 Hz to 20 MHz are measured. In the
channel "B" position, measurement of frequencies from 20 MHz to 2700 MHz
(= 2.7GHz) is possible. The respective position is indicated in the display.
Selecting the "GATE" time
To achieve the highest possible resolution, select the maximum possible gate time
"10s".
For rapidly-changing signals, select "0.1s". For standard applications, the setting
"1s" is recommended. Each time the "GATE" button is pressed, the gate time is
changed by a factor of 10.
HOLD function
If the "HOLD" button is pressed, the currently-measured frequency is "frozen" in the
display. This remains so, even when the BNC lead is disconnected from the item being
measured.
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