Agilent Technologies E8257C PSG Specifiche Scaricare il pdf (Pagina 4)

4

The PSG signal generator can be

leveled externally by connecting an

external sensor at the point where

leveled RF output power is desired.

The sensor detects changes in RF

output power and returns a compen-

sating voltage to the signal genera-

tor’s ALC input. The ALC circuitry

raises or lowers (levels) the RF

output power based on the voltage

received from the external sensor,

ensuring constant power at the

point of detection.

Two types of external leveling are

available on the PSG. You can use

external leveling with a detector and

coupler/power splitter setup, or a

millimeter-wave source module.

Leveling with detectors and

couplers/splitters

Figure 3-1 illustrates a typical exter-

nal leveling setup. The power level

feedback to the ALC circuitry is

taken from the external negative

detector, rather than the internal

signal generator detector. The

feedback voltage controls the ALC

system, leveling the RF output

power at the point of detection.

To use detectors and couplers/

splitters for external leveling at

an RF output frequency of 10 GHz

and an amplitude of 0 dBm, follow

the instructions in this section.

Required equipment

• Agilent 8474E negative detector

• Agilent 87301D directional coupler

• cables and adapters, as required

Connect the equipment

Set up the equipment as shown in

Figure 3-1.

Using External Leveling

Figure 3-1.

External detector

leveling with a

directional coupler.

LINEOI

INTERNAL PULSE GENERATOR

GATE/PULSE

TRIGGER INPUT

50Ω

VIDEO

OUT

50Ω

SYNC

OUT

50Ω

RF OUTPUT

50Ω

REVERSE PWR

1W MAX 0V DC

!

LP OUTPUT

ALC INPUT

EXT 2 INPUT

EXT 1 INPUT

Sweep/

List

AM

FM/

ΦM

LF Out

Pulse

Utility

MENUS

Save Recall Trigger Help

Mod

On/Off

RF

On/Off

7 8 9

4 5 6

1 2 3

0 .

+/-

Hold

Incr

Set

E8254A

250 kHz – 40 GHz

PSG -A Series Signal Generator

Frequency

Amplitude

ReturnLocalPrint

FREQUENCY

AMPLITUDE

40.000 000 000 000

GHZ

10.00

dBm

MOD

ON

RF

ON

RF output

ALC output

Signal generator

Directional

coupler

Negative

detector

Leveled

output

1 2 3 4 5 6 7 8 9 ... 19 20

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