HP 70908A, Руководство по обслуживанию

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The Troubleshooting T ool Program
This program allows communications from the controller keyboard to the HP 70908A
RF section. The user can congure the HP 70908A RF section for specic test setups that
utilize the external test equipment in the LOCAL mode . The following selections appear on the
display .
1. PRESET
2. SELECT B AND
3. LOCK DISC
4. DIA GNOSTICS
5. 321.4 IF
6. 21.4 IF
7. STEP GAIN ON
8. STEP GAIN OFF
9. CAP ABILITY STRING
10. SET A TTENU A TOR
11. SERIAL NUMBER
12. FIRMW ARE D A TE CODE STRING
13. CONFIGURA TION STRING
PRESET must precede any other tool command. It opens a communication link from the
system controller to the HP 70908A RF section.
SELECT B AND congures the HP 70908A RF section to one of the four bands: 1H0, 1L0, 2L0,
or 4L. LOCK DISC must follow selection of band 1L0, 2L0, or 4L0.
DIA GNOSTICS lists (on controller display) errors currently being generated by the HP 70908A
RF section.
321.4 IF selects the 321.4 IF output path from the last converter .
21.4 IF selects the 21.4 IF output path from the last converter .
STEP GAIN ON enables the step gain circuit in the last converter 21.4 MHz amplier .
STEP GAIN OFF disables the step gain circuit.
CAP ABILITY STRING reads information (such as atness correction) from the EEROM.
SET A TTENU A TOR sets the RF attenuator to any setting from 0 to 70 dB attenuation.
SERIAL NUMBER reads and displays the serial number stored in EEROM.
FIRMW ARE D A TE CODE STRING reads and displays the date code stored in EEROM.
CONFIGURA TION STRING reads and displays the current conguration.
4-50 T roubleshooting