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Instrument Changes Model 8904A
Cable Routing
1.
Refer to figures
7-1, 7-2
and
7-3.
Remove the BNC connector ends from the rear panel one at
a
time and insert them into the corresponding openings in the front panel.
2.
After all of the connectors have been transferred to the front panel, loop the cables and secure
them to the front of the deck using the new cable ties as shown in figure
7-3.
3.
Install one nut on each connector.
4. Tighten the nuts on the BNC connectors hand tight using the nut driver. (The holes in the panel
are
D
shaped and therefore prevent the connector from turning without having to tighten the
nuts excessively.)
5.
Verify that the SMC connections on the
A3
Output Assembly and, if the instrument has
Option
002,
the
A10
Output Assembly are tight.
Final Steps
1.
Insert the new plastic hole-plugs into the rear-panel output openings by carefully working the
plugs into the holes with your fingers. The plugs
fit
tightly and will require some pressure to get
them started in the holes.
2.
Replace the bottom cover by reversing the removal procedure.
3.
Remove the Option
004
label from the rear panel.
Operation Verification
1.
Connect the power cord and turn the instrument on.
2.
The instrument should beep immediately upon power up and then again about
4.5
seconds later.
The display should read
~~
*
HP
8904A
Main
Selection Level
*
fl
Channel Config.
3.
Key in the following keys. (This will set up
5
V
dc on the
OUTPUTS
1
HIGH
connector and
ground the
LOW
connector.)
fl
(Channel
Config.
NEXT
SHIFT FLOAT
1
OFF
WAVE FORM
r
AMPTD
5
V
4.
Connect a DC voltmeter, set to measure a
5
V
dc signal, to the
OUTPUTS
1
HIGH
connector.
5.
If the instrument is equipped with a second output, Option
002,
key in
The voltmeter should read approximately
5
V
dc.
NEXT
SHIFT FLOAT
2
OFF
WAVE FORM
=
AMPTD
5
V
6. Connect the DC voltmeter to the
OUTPUTS
2
HIGH
connector. The voltmeter should read
7.
Perform the
AC and DC Amplitude Accuracy Test
and the
AC Amplitude Flatness Test.
(Refer to
approximately
5
V
dc.
the
HP
8904A
Operation and Calibration Manual.)
7-6
Rear-to-Front-Panel Output Conversion
reu.15DEC89