Note

The logic levels listed

in Table 12-3 show the default ac usage (pin 5 low, pin 6

 

high). DC usage (pin 5 high, pin6 low) is not shown.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 12-3. HP 8562E Attenuator Control Truth Table

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HP 85623

I

 

 

 

 

 

A14U420 Pin Number

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ATTEN SettingSetting

3 3

4 4

 

 

55

66

10

 

 

 

 

 

13

 

 

 

 

I

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20 dB

t-!

 

-!-l

40 dB

40 dB

 

 

 

10 dB

 

 

 

 

 

 

 

20 dBdB

 

DC AC

 

 

 

 

 

0

 

high

 

 

loww

l low hhigh

low

high

low

high

 

 

 

10

 

high

 

 

low

l low hhigh

low

highg h

hhigh

 

low

 

 

 

20

 

low

 

 

high

 

low high

low

high

low

 

high

 

 

30

 

low

 

 

high

 

low high

low

highh

hhigh

 

low

 

 

 

40

 

high

 

 

loww

 

l low high

hhigh

low

low

 

high

 

 

 

 

 

 

 

 

 

 

50

 

high

 

 

loww

 

l low high

hhigh

low

 

high

 

 

low

 

 

 

 

 

 

 

 

 

 

 

 

60

 

low

 

 

highh

 

llow highh

hhigh

low

 

low

 

 

high

 

 

70

 

low

 

 

highh

 

llow

highh

hhigh

low

 

high

 

 

low

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Al3 Second Converter

Caution The Al3 assembly is extremely sensitive to Electrostatic Discharge (ESD). For further information regarding electrostatic cautions, refer to “Electrostatic Discharge” in Chapter 1, “General Information.”

1.Connect the HP 85623 CAL OUTPUT to the INPUT 50R connector.

2.Set the HP 85623 to the following settings:

Centerfrequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz Input attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB

3.Disconnect W35 (coax 92) from A13J2.

4.Connect a test cable from A13J2 to the input of another spectrum analyzer.

5.Tune the other spectrum analyzer to 310.7 MHz. The signal displayed on the other spectrum analyzer should be approximately -38 dBm.

6.Connect the positive lead of a DVM to A14J19 pin 15.

7.Set the HP 85623 CENTER FREQ to 3 GHz.

8.The DVM should measure between -2.0 Vdc and -3.5 V dc. If the voltage measures outside this limit, perform the following steps:

RF Section 12-9

Page 435
Image 435
Agilent Technologies 856290216 service manual Low