Anritsu K250 Manuel utilisateur

OPERATION AND MAINTENANCE

MANUAL FOR BIAS TEES

1. INTRODUCTION

This manual describes the Model K250 and V250

Bias Tee (Figure 1). It provides specifications and a

list of precautions the user should observe when us-

ing the bias tees.

2. DESCRIPTION

The precision K250 and V250 Bias Tees were de-

signed for applications where both dc and RF signals

must be applied to a device under test. They are par-

ticularly suited for active device measurements. DC

voltages of up to 30 volts at 0.5 amperes may be ap-

plied to test devices with negligible effect on RF per-

formance. Low RF throughline loss (dB) and low re-

turn loss ensure negligible effect on measurements

up to 60 GHz. An RF input dc block isolates the in-

put port from the applied bias voltage.

3. SPECIFICATIONS

Table 2 provides performance specifications.

4. PRECAUTIONS

ANRITSU K250 and V250 Bias Tees are

high-quality, precision laboratory devices and

should receive the same care and respect afforded

other such components. Complying with the follow-

ing precautionary notes will guarantee longer com-

ponent life and less equipment downtime due to con-

nector failure. Also, such compliance will ensure

that RF component failures are not due to misuse or

abuse—two failure modes not covered under the

ANRITSU warranty.

a. Beware of Destructive Pin Depth on Mating

Connectors. Measure the pin depth of the con-

nector that mates with the RF component, before

mating. Use an ANRITSU Pin Depth Gauge

(Figure 2, Table 1) or equivalent. Based on RF

components returned for repair, destructive pin

depth on mating connectors is the major cause of

failure in the field. When an RF component con-

nector is mated with a connector having a de-

structive pin depth, damage will likely occur to

the RF component connector. (A destructive pin

P/N: 10100-00025

REVISION: D

PRINTED: MARCH 2000

490 JARVIS DRIVE l MORGAN HILL, CA 95037-2809

Figure 1. Model K250 Bias Tee

depth has a center pin that is too long in respect

to the connector’s reference plane.)

The center pin on an RF component connector

has a precision tolerance measured in mils

(1/1000 inch), whereas connectors on test de-

vices that mate with RF components may not be

precision types. Their pins may not have the

proper depth. They must be measured before

mating to ensure suitability. When gauging pin

depth, if the test device connector measures out

of tolerance in the “+” region, the center pin is

too long. Mating under this condition will likely

damage the RF component connector. On the

other hand, if the test device connector mea-

sures out of tolerance in the “–” region, the cen-

ter pin is too short. While this will not cause any

damage, it will result in a poor connection and a

consequent degradation in performance.

The pin depth for bias tee models are as shown

below:

K250: 0.000 to –0.005.

V250: 0.000 to –0.003.

b. Avoid Over Torquing Connectors. Over

torquing connectors is destructive; it may dam-

age the connector center pin. Never use pliers to

tighten connectors.

c. Avoid Mechanical Shock. RF components

are designed to withstand years of normal bench

handling. However, do not drop or otherwise

treat them roughly. They are laboratory-quality

devices and, like other such devices, require

careful handling.

d. Keep Bias Tee Connectors Clean. The pre-

cise geometry that makes the RF component’s

high performance possible can be easily dis-

turbed by dirt and other contamination adher-

ing to connector interfaces. When not in use,

keep the connectors covered. Refer to paragraph

5 for cleaning instructions.

5. MAINTENANCE

ANRITSU recommends that no maintenance other

than cleaning be attempted by the customer. The

bias tee should be returned to ANRITSU for repair

and/or service when needed.

The traditional method of cleaning K Connectors

with a cotton swab and alcohol can break the male

connector pin on the precision connectors. The rea-

son: the cotton swab has a larger diameter than the

connector (that is, the area between the inner wall

and the center pin.)

We still recommend using a cotton swab; however,

you need to trim the swab before inserting into the

connector.

Some precautions bias tee:

Use either the finger saver that has been pro-

vided with the bias tee or use a 5 inch-pound

torque wrench when connecting to other de-

vices. No other tools are recommended.

Always spin the coupling nut to tighten con-

nections. Spinning the connector body causes

premature wear to the connector interface.

Do not disturb connector center pin. Improper use

(see above) of a cotton swab or other such probe to

clean the inner connector may cause the center con-

ductor to hinge on its bead and weaken or shear the

internal connection.

2 K/V250 OMM

211

Figure 2. Pin Depth Gauge

Model Connector Type Gauging Set Model

V250 V Consult Factory

K250 K 01-162

Table 1. Available Gauging Sets

K/V250 OMM 3

Weight: 57 g (2 oz.) Temperature Range: –0°C to +60°C

Table 2. Performance Specifications, 1 of 2

Specification K250 V250

Frequency Range 0.1 to 40 GHz10.1 to 60 GHz1

Insertion Loss 1.2 dB maximum22.2 dB maximum2

Return Loss 15 dB minimum to 20 GHz

10 dB minimum to 40 GHz 13 dB minimum to 20 GHz

9 dB minimum to 40 GHz

8 dB minimum to 60 GHz

RF Power 1W maximum 1W maximum

DC Voltage 30V maximum 30V maximum

DC Current 0.5A maximum 0.5A maximum

DC Port Isolation 20 dB at 0.1 GHz

40 dB above 0.5 GHz 20 dB at 0.1 GHz

40 dB above 0.5 GHz

RF Connectors Input: K Male

Output: K Female Input: V Male

Output: V Female

DC Connector SMC Male SMC Male

1 Usable between 0.04 and 0.1 GHz with degraded performance

2 Typical

OUT

Schematic Diagram (K and V Connector Models)

Table 1. Performance Specifications, 2 of 2

OUT

RF IN

BIAS TEE K250

1.15 NOM

0.5 NOM

0.525 NOM

0.100 NOM

0.106 THRU

0.25 NOM

0.5 NOM

K or V

MALE

K or V

FEMALE

Outline Drawing (K and V Models; Dimensions in Inches)

0.310 NOM

Ce manuel convient aux modèles suivants

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