HP 8340A Operating Manual page 341

[SHIFT] [MHz] [1) [4] (Hz]
[SHIFT] [MHZ] Ill [9] 141 [6] [Hz]
The "CALIBRATION STORED"
DISPLAY.
Press
[INSTR PRESET[,
suspect a problem with the instrument's memory.
KICK - This refers to the kick pulses used to reset the YO (YIG Oscillator) and
SYTM (Switched YIG-Tuned Multiplier).
Oscillator Pretunc assembly or the A28 SYTM Driver board.
ADC This refers to a check performed on the ADC (analog to digital converter)
-
circuits on the A27 Level Control board.
SET] or power on.
cate a different power than the instrument is actually producing.
ADC failure will not allow the Peak
[PEAK]) functions to operate properly.
problem on the A27 Level Control board.
- This refers to an instrument function that peaks the RF output power at a
PEAK
frequency by fine tuning the SYTM (the SYTM is tuned to the YO
CW
frequency).
PEAK is flashing, something is wrong with the circuitry that peaks the
SYTM. PEAK
power. This is an instrument failure which requires service to correct.
However, the optimum power may not be adversely affected and may still
acceptable to the opera tor.
- This refers to an instrument function that peaks the RF output power while
TRK
the instrument is sweeping.
been pushed.
flashing.
UNLEVELED ANNUNCIATOR
8.
The UNLEVELED
UNLEVELED light is off, the output power is leveled and if the light is on, the
power is unleveled.
A. Make sure that the correct leveling mode is selected.
desired, the
INT
light should be on.
on. The three lights just mentioned arc located on the associated front panel
keys.
The power level requested should not be greater than the maximum power
B.
specification at a given frequency.
the power requested does not exceed the maximum power specification for the
entire band or bands that arc being swept.
C. If the output.power is unleveled at all power levels and all frequencies, suspect a
problem on the A25 ALC Detector board, the A26 Linear Modulator board, or the
RF path.
HP 8340A - Appendix A
the
FAULT
ADC indicates that the
This fault can only come on if the
indicates that the instrument is not able to optimize its output
This fault can only occur if
The TRK light indica tcs the same things as if
light is used to indicate the status of the RF output power.
light should be on.
If power meter leveling is desired, the
If the instrument is sweeping, make sure that
- 7 -
Scans by HB9HCA and HB9FSX
message will appear in the
indicator should be off.
Suspect a problem in the A54 YIG
This check is done at
POWER dBm
(IPEAKJ) and Auto Tracking
If this annunciator is on, suspect a
(PEAK)
If internal leveling is
If external leveling is desired, the
ENTRY
If it is still on,
[INSTR PRE­
display may indi­
Also, an
(!SHIFT]
button is pushed. If
has
[SHIFT) (PEAK)
PEAK were
If the
XT AL
METER light should be