HP 8340A Operating Manual page 340

Suspect the YO loop.
YO -
Nl - Suspect a problem in the PLLl or PLL3 Loops in the 20-30 Loops.
Suspect a problem in the PLL2 loop in the 20-30 Loops.
N2 -
7. FAULT ANNUNCIATOR
The-FAULT light is used to monitor the status of 5 different internal functions.
These functions arc described below.
The
UAL]. ENTRY DISPLAY
FA ULT: CAL KICK ADC PEAK TRK
The name of the function that has a problem will be flashing.
CAL - This refers to the calibration constants stored in memory (on the A60 Proces­
sor board).
PRESET)
calibration constant data.
power output flatness and accuracy degradation.
the factory-determined calibration constants must be re-entered into the
instruments memory.
print-out of the calibration constants from the plastic jacket located on the
left-hand side of the instrument.
following procedure must be performed to enter the calibration constants
back into memory.
constant print-out back into the instrument.
The following procedure affects data required for
optimum
should be taken when accessing
tion data.
Calibrntion Constant Access Procedure
J. Press
[SHIFT) [GHz) [1) [Hz)
[SHIFT] [MHz) [1) 121 [Hzl
[SHIFT] [KHz) [2] [2] [HZJ
The value of calibration Constant #l will be displayed in the
DISPLAY.
2.
Compare the value on the
print-out.
the
DAT A ENTRY
view the next calibration constant.
3. Repeat step 2 until all the instrumcn t cal i bra ti on cons tan ts are the same as
those shown on the print-out.
4. Store the entered calibration constants into protected memory by pressing the
following keys:
HP 8340A - Append ix A
Jf the
wiJI show the following:
The calibration constants arc checked only when an
is done. If CAL is flashing the instrument has resorted to default
The major effect of this condition wiJI be RF
Remove the top cover of the instrument.
When this procedure is complete, place the calibration
CAUTION
performance of
ENTRY DISPLAY
If the values do not match, enter the value from the print-out via
keyboard and then press
- 6 -
Scans by HB9HCA and HB9FSX
light is on, press
FAULT
To remedy this situation,
Replace the instrument's top cover.
the instrument. Care
changing calibra­
01·
with the value listed in the
Press the up
[Hz).
[SHIFT] [MAN­
!INSTR
Get the
The
ENTRY
key to
STEP