Agilent Technologies E4438C manual Level switching speed, Level accuracy with ALC on

Specifications for Frequency and Power Characteristics

Level accuracy with digital modulation turned on [relative to CW]

Conditions: [with PRBS modulated data;

if using I/Q inputs, √ I2 + Q2 = 0.5 Vrms, nominal] 1

Level accuracy with ALC on

π/4 DQPSK or QPSK formats

Conditions: With raised cosine or root-raised cosine filter and a ≥ 0.35; with 10 kHz ≤ symbol rate ≤ 1 MHz; at RF freq ≥ 25 MHz; power ≤ max specified –3 dB

	Option 501-504		Option 506
	±0.15 dB		±0.25 dB
	Constant amplitude formats [FSK, GMSK, etc]
	Option 501-504		Option 506
	±0.1 dB		±0.15 dB
Level accuracy with ALC off 1, 2		(±0.15 dB) [relative to ALC on]
	Conditions:	After power search is executed, with burst off.
Level switching speed 1
			Option 501-504	With Option UNB	Option 506
	Normal operation [ALC on]		(< 15 ms)	(< 21 ms)	(< 21 ms)
	When using power search manual		(< 83 ms)	(< 95 ms)	(< 95 ms)
	When using power search auto		(< 103 ms)	(< 119 ms)	(< 119 ms)

1.Parentheses denote typical performance.

2.When applying external I/Q signals with ALC off, output level will vary directly with I/Q input level.

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