Agilent Technologies 85032B/E 50 Manuale Utente Scaricare il pdf (Pagina 4)

AM Delay (Option 1DA/1DB)

This option adds amplitude modulation group

delay capability, which allows measurements of

group delay through frequency-translation devices

such as tuners or mixers. Using two external scalar

detectors (86200B or 86201B) and a power splitter

(all included) this option measures group delay in

any device that does not have limiting circuits, satu-

rated amplifiers, or automatic gain control.

Aperture 55.56 kHz

Resolution 1 ns /division

Accuracy

±4 ns

Delay range 30 µsec, (9000 m)

Amplitude range –10 to +13 dBm (typical)

Power Delay

0 to 10 dB ±10 ns

10 to 20 dB ±20 ns

AM Delay Dynamic Accuracy (typical)

Group Delay

Group delay is computed by measuring the phase

change within a specified frequency step (deter-

mined by the frequency span, and the number of

points). This is also known as d(phi)/d(omega).

Aperture

Maximum aperture: 20% of frequency span

Minimum aperture: (frequency span) /

(number of points –1)

Range

The maximum delay is limited to measuring no

more than 180° of phase change within the mini-

mum aperture. Range = 1 / (2 x minimum aperture)

Accuracy

The following graph shows group delay accuracy at

1.3 GHz with type-N transmission calibration and

15 Hz IF bandwidth. Insertion loss is assumed to

be <2 dB and electrical length to be ten meters.

.01

10 100

.01

100

Aperture - MHz

Uncertainty - nsec

Group Delay Accuracy

Frequency = 1.3 GHz Electrical Length = 10 meters

3. Specified at 0 dBm, 16 averages, well-matched device, normalized.

4. Normalized at +10 dBm.

Group Delay

1 2 3 4 5 6 7 8 9 10 11 12

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Agilent Technologies 85032B/E 50 Manuale Utente Pagina 4

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