Service manual

2 Agilent 8494A/B, 8495A/B, 8496A/B Operating And Service Manual

Description

Agilent 8494A/B, 8495A/B, and 8496A/B are 50-ohm coaxial step

attenuators.

For the 8494A/B, the attenuation can be varied in 1 dB steps, or 10 dB steps

for the 8495A/B and 8496A/B. The attenuation shown on the control knob is

the additional attenuation added in the signal path over the insertion loss of

the attenuator in the 0 dB position.

• Agilent 8494A/B instruments are four-section attenuators with a range

of 0 dB to 11 dB in 1 dB steps.

• The 8495A/B is a three-section attenuator with a range of 0 dB to 70 dB

in 10 dB steps.

• The 8496A/B is a four-section attenuator with a range of 0 dB to 110 dB

in 10 dB steps.

The attenuator sections are connected in cascade. Each section consists of a

precision, thin-ﬁlm attenuator card, a lossless thru-line and a ganged pair of

edge line transmission lines. The edge lines are ﬂexed to make contact with

either the attenuator card or the thru-line. The edge line contacts are

gold-plated leaf springs which ensure long life and high repeatability.

Low-torque cams ﬂex the edge lines. Table 1, “Attenuator Switching Order”

on page 7 shows the switching arrangements.

CAUTION Do not exceed the RF power rating of 1 W average or 100 W peak with a

maximum pulse width of 10

µs. Do not connect an attenuator RF input or

output connector to greater the 7Vdc. If the attenuator must be connected to

a device with a potential greater than 7 Vdc, use a blocking capacitor.

Instrument Options Each instrument is speciﬁed with an option number which denotes the

conﬁguration of the input and output connectors.

Option Connector Description

001 Both connectors Type N female

002 Both connectors SMA female

003

1. Option 003 is not available with the 8494A, 8495A, and 8496A.

Both connectors APC-7