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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
Setting
I
ATTEN
Setting 3 4 5 6 10
4
10
0
10
20
30
40
50
60
70
3
20
dB
high
high
low
low
high
high
low
low
5 6
DC AC
low high
low high
low high
low high
low high
low high
low high
low high
40
dB
40
dB
low
low
high
high
low
low
high
high
low
20
dB
DC AC
20
dB
low low high
t-!-!-l
low low high
high low high
high low high
low
lowlow
lowlow
lowlow
high
high
high
high
40
dB
high low low high high
high low low high high
low high low high high
low
high low high high
13
10
dB
40
50
60
70
high high low
high low high
high
high
high
high
low
low
low
low
high high low
low
low high
low
high
low
high
low
high
low
high
high
low
high
low
high
low
high
low
low
high low
low
low high
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