Datasheet

Page 10

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Performance Characteristics (continued)

Switching point

The N8480 Series power sensors (excluding Option CFT) have two measurement ranges:

a lower power range and an upper power range. The power meter automatically selects

the proper power level range. To avoid unnecessary switching when the power level is

near the switch point, switching point hysteresis has been added.

N8481A/82A/85A/87A/88A and N8486AQ/AR power sensors

This hysteresis causes the lower power range to remain selected until approximately

–0.5 dBm as the power level is increased. Above this power, the upper power range is

selected.

Likewise, the upper power range remains selected until approximately –1.5 dBm as the

signal level decreases. Below this power, the lower power range is selected.

N8481B/82B power sensors

This hysteresis causes the lower power range to remain selected until approximately

29.5 dBm as the power level is increased. Above this power, the upper power range is

selected.

Likewise, the upper power range remains selected until approximately 28.5 dBm as the

signal level decreases. Below this power, the lower power range is selected.

N8481H/82H power sensors

This hysteresis causes the lower power range to remain selected until approximately

17.5 dBm as the power level is increased. Above this power, the upper power range is

selected.

Likewise, the upper power range remains selected until approximately 16.5 dBm as the

signal level decreases. Below this power, the lower power range is selected.

Power range in range setting

Sensor Range setting Lower range Upper range

N8481A/82A/85A/87A/88A and

N8486AQ/AR excluding Option CFT

AUTO (default) –35 to –1 dBm –1 to +20 dBm

LOWER –35 to –1 dBm —

UPPER

— –30 to +20 dBm

N8481B/82B excluding Option CFT AUTO (default) –5 to +29 dBm +29 to +44 dBm

LOWER –5 to +29 dBm —

UPPER

— 0 to +44 dBm

N8481H/82H excluding Option CFT AUTO (default) –15 to +17 dBm +17 to +35 dBm

LOWER –15 to +17 dBm —

UPPER

— –10 to +35 dBm

1. Recommended for pulse signals measurement with period of more than one second