BNC 630 - Manual (Page 19)

14
5.0 Mode Descriptions
The following pages describe each operating mode of the 630. The meaning of each parameter that appears on the LCD display is
described in detail.
5.1 Basic Sinewave (CW) Mode
Introduction
The Basic Sinewave (CW) mode generates a sinewave of fixed frequency and level. This mode is entered by pressing the
Sinewave One Touch Mode Selection key.
NOTE: In this mode you can set the output frequency to 0 Hz and, by specifying an offset voltage, use the 630 as a variable voltage
source (with a 50 ohm output impedance). Up to +/- 70 mA can be drawn from the SIG Out output.
Sinewave Mode Parameters
The Sinewave mode has the following front panel display:
Figure 5.1-1: Sinewave mode display
Each parameter is described below:
1. Frequency
In this field enter the frequency of the sinusoid, from 0 Hz (DC) to 21.5000000 MHz in .01 Hz steps.
2. Level
In this field enter the output level, from 4 mVp-p to 10 Vp-p in 1 mV steps or from -44.0 dBm to +24.0 dBm in .1 dBm steps.
NOTE: The level specified is a 50 ohm LOADED level. This is the level of the signal which will appear across a 50 ohm load
connected to the SIG Out connector. Into an open circuit, the output swing will be twice the value entered.
Offset
By pressing this key, you can enter an offset voltage for the output waveform. For more information on output offsets refer to
section 4.4.
Ext Gating Input
(rear panel connector)
This TTL compatible input can be used to gate the output signal on or off. A logic high voltage on this jack (+3V to +10V) will
turn off the output signal. A logic low voltage on this jack (0V to -10V) will leave the output signal on.
For further information on the Ext Gating Input, refer to section 2.0.
Sinewave Mode
20,000,000.00 MHz -10.0 dBm 2 1