Disassembly And Access - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

1693 RLC Digibridge
7. Press: [MEASURE RATE] key to select
FAST rate. Repeat the procedure of steps
3, 4, 5 (as summarized below), for this rate
A. Time the interval between the next two
keystrokes.
B. Press: [FUNCTION] key to select
MEASURE function. Wait 60 seconds.
C. Press: [FUNCTION] key to select ENTER
function.
D. Press: [SHIFT] [BIN SUM] [0] [1].
E. Read the left-hand display, the number of
measurements made in 60 s.
F. Use this number as "x" in the following
formula.
T = 60,000 milliseconds / x
For example, if x = 493, then T = 122 ms ±5%.
G. Clear "bin sum" registers by pressing [=]
[SHIFT][BIN SUM][0][0][1][4]
8. Select "Max" measurement rate by pressing
[.][2][5][=][SHIFT][SPECIAL][5]. Repeat
the procedure of steps 3, 4, 5 (as summarized
below), for "Max" rate.
Note: Indicated measure rate must be FAST. For
explanation, see paragraph 3.5.5.
A. Time the interval between the next two
keystrokes.
B. Press: [FUNCTION] key to select
MEASURE function. Wait 60 seconds.
C. Press: [FUNCTION] key to select ENTER
function.
D. Press: [SHIFT] [BIN SUM] [0] [1].
E. Read the left-hand display, the number of
measurements made in 60 s.
F. Use this number as "x" in the following
formula.
T = 60,000 milliseconds / x
For example, if x = 771, then T = 78 ms ±5%.
G. Clear "bin sum" registers by pressing [=]
[SHIFT][BIN SUM][0][0][1][4]
116

5.5 Disassembly and Access

WARNING
I f d i s a s s e m b l y o r s e r v i c i n g i s
necessary, it should be performed
only by qualified personnel familiar
with the electrical shock hazards
inherent to the high voltage circuits
inside the cabinet.
CAUTION
Observe precautions against damage
by static electricity whenever you
handle a circuit board or integrated
circuit in this instrument. Refer to
the Safety section (Section 5.1). Use
the following procedure for access to
replaceable parts and contact points
used in trouble analysis.
1. Disconnect the power cord. Optionally, re-
move the bail from the front feet by bending
it temporarily. (It is springy enough to resume
its former shape.)
2. For access to the bottom of the main board,
without further disassembly, remove the
access panel from the bottom of the instru-
ment. Note: this panel is held by ten screws
and covers a major part of the bottom area.
3. Remove the four rubber or plastic feet (one
screw for each rear foot, two screws for each
front foot). Notice that the front feet are not
interchangeable.
4. Slide the instrument forward (or cover to the
rear) until they are separated. (Reassembly
note: slide the cover on until the rear feet
mounting holes in the cover are aligned with
corresponding holes in the chassis.)
Service and Maintenance