DETAILED OPERATION
4-21
Selecting RF level
RF level can be entered in the range −140 to +13 dBm (or to +25 dBm for the High Power
Option).
(1) Select the RF level from the main screen by pressing [RF LEVEL]. RF Levl: is highlighted
on the screen.
(2) Enter the required value using the numerical key pad.
(3) For voltage terminate using the [μV], [mV] or [V] key. For dBm terminate using the [dB]
key. RF levels in linear (PD or EMF) and logarithmic units are selected from the utilities.
(4) The level can then be adjusted either in steps or by using the control knob for continuous
adjustment. The default increment/decrement is 1 dB.
(5) You can check the current amount of offset from the reference level by pressing and
holding [TOTAL Δ].
(6) Pressing [RETN] returns you to the reference level; pressing [SET REF] selects the
currently displayed level as the reference level.
(7) The RF output level may be toggled on and off by means of the [CARR ON/OFF] key.
Choice of units
Conversion can be made between dB and V by pressing the appropriate units key. Selection of
linear and logarithmic units is made using Util 10 and Util 11 respectively (see below).
Attenuator hold
Pressing the [ATTEN LOCK] key inhibits operation of the step attenuator from the level at which
the key is enabled. This is usable for a level reduction of at least 10 dB. Whilst in operation the
display shows Atten Lock.
Reverse power protection
Accidental application of power to the RF OUTPUT socket trips the reverse power protection
(RPP) circuit (unless Option 1: No Attenuator is fitted, which has no protection) and causes
Fig. 4-16 to be displayed.
Fig. 4-16 RPP tripped display
The protection circuit can be reset by pressing any key after having removed the power source.
The display then returns to the menu in use at the time that the RPP was tripped.
Note that the protection circuit may be activated when the generator is set to a high level and the
RF OUTPUT socket has no terminating load.
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