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Operating Instructions— 2236 Service
dc level than that previously applied, especially if the dc-
level difference is more than 10 times the VOLTS/DIV
switch setting:
1. Set the Input Coupling switch to GND.
2.
Insert the probe tip into the oscilloscope GND connec
tor and wait several seconds for the input coupling capacitor
to discharge.
3.
Connect the probe tip to the signal source and wait
several seconds for the input coupling capacitor to charge.
4.
Set the Input Coupling switch to AC. The display will
remain on the screen, and the ac component of the signal
can be measured in the normal manner.
POWER-UP CHECKS
The Counter, Timer, and Multimeter (CTM) contains
Power-Up Checks that are performed each time the instru
ment is turned on. These checks consists of ROM, Counter,
and DMM in this order. Each of these checks must pass
before proceeding to the next check. If a check fails, an
error message will appear in the readout (see Table 2-2).
Refer the error message to qualified service personnel.
TABLE 2-2
Power-Up Checks
Check
Error Message
ROM
FAIL-ro
Counter
FAIL-ctr
DMM
FAIL-d
CTM MEASUREMENT CONSIDERATIONS
Nongated measurements are performed from the A Trig
ger system on signals selected by the A Trigger source
switches. Signals may be applied through the CH 1 input,
CH 2, or the EXT INPUT connectors. Nongated measure
ments may also be performed on the instrument power
source by setting the A SOURCE switch to LINE position.
The A TRIGGER LEVEL control, A TRIGGER Mode, A
TRIGGER SLOPE, A&B INT, A SOURCE, A EXT COU
PLING, and BW LIMIT switches are effective in conditioning
the input signal.
Trigger status messages ("no A trig” and “no b trig”) are
not displayed in any mode of the width function so that mea
surement results can be displayed indefinitely. This allows
single pulse measurements.
Gated measurements are performed from the B Trigger
system on input signals being applied to either CH 1, or CH
2 input connectors. The gate interval (set by adjusting the
intensified zone with the B DELAY TIME POSITION control
and the B SEC/DIV switch) must be shorter than the A
Sweep duration, such that the intensified zone ends before
A Sweep ends. The A TRIGGER A&B INT switch and the B
TRIGGER LEVEL control and SLOPE switch are effective in
conditioning the input signal.
Noise may be coupled to the A and B Trigger circuits
along with the signal to be measured. Noise may originate
from the operating environment, the signal source, or by
improper connections. If the noise is of sufficient amplitude,
it can result in inaccurate, measurements due to false trig
gering. The 2236 has a 20 MHz Bandwidth Limiter that is
helpful in removing or reducing the noise in the A and B
Trigger systems.
Channel 1 volts measurements should be made with the
signal fully displayed within the graticule area through the
appropriate use of the CH 1 VOLTS/DIV switch and CH 1
VOLTS/DIV Variable control. This prevents the Channel 1
input circuit from being overdriven and distorting the voltage
measurements.
STATUS AND ERROR MESSAGES
The Counter, Timer, and Multimeter (CTM) system will
display several types of status and error messages on the
readout.
Control button Error— When the buttons are in an ille
gal mode, the readout will display “Control button Er
ror” by scrolling it across the readout. The error
message will repeat itself until a correction is made.
O’FLO— When measuring the width of an input signal
that exceeds five seconds in duration, the overflow
message “O’FLO” will be displayed on the readout.
no ALT H—With the instrument in A HORIZONTAL
MODE (non-delay), the readout will display a “no ALt
H” when either the A TIME or DLY TIME mode is
selected.
no A trig— With the A TIME mode and either the ALT
or B HORIZONTAL MODE selected, the readout will
display “no A trig” when either the A Sweep is not
running, or is too slow. This message is also displayed
with the instrument in A HORIZONTAL MODE and
either the FREQ or PER mode selected, and the CTM
is not receiving a trigger signal.
2-12
Содержание 2236
Страница 10: ...2236 Service viii The 2236 Oscilloscope ...
Страница 28: ...Specification 2236 Service 1 18 ADD JAN 1985 Figure 1 2 Physical dimensions of the 2236 Oscilloscope ...
Страница 74: ...Theory of Operation 2236 Service 3 30 ...
Страница 75: ...Theory of Operation 2236 Service Figure 3 13 Typical waveforms for the Delta Time function with Valt HI 3 31 ...
Страница 102: ...Performance Check Procedure 2236 Service 4 21 Figure 4 1 Test setup for DMM common mode check ...
Страница 240: ...2236 Service CTM INTERFACE SIGNALS F ig u re 9 4 O s c illo s c o p e b a sic b lo c k diag ram 4294 46 ...
Страница 241: ... VERT DEFL 2236 Service 4 2 0 6 3 5 4 2 0 4 4 7 F ig u re 9 5 O scillo sco p e d e ta ile d b lo c k diag ram ...
Страница 242: ...2236 Service 4204 34 Figure 9 6 CTM basic block diagram ...
Страница 243: ...DMM POWER S U P P LIE S 2236 Service F ig u re 9 7 C T M d e ta ile d b lo c k diag ram ...
Страница 253: ...A10 COUNTER TIMER MULTIMETER BOARD F ig u re 9 8 C irc u it b o a rd lo c a tio n Illu s tra tio n ...
Страница 254: ...S I 0 O I 5 1 S O i 4204 21 C IR C U IT BOARD INTERCONNECTIONS ...
Страница 255: ...2 2 3 6 S e rv ic e A ll c o m p o n e n ts on th e A 2 A tte n u a to r b o a rd are lo c a te d on D ia g r a m ...
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Страница 313: ...2236 Service T O U I 3 0 0 4 8 K T O UI300 II S K 0 2 2 3 6 Z Z O A Z 2 OPTION IA ...
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Страница 319: ...2236 Service TROUBLESHOOTING GUIDE 4206 99 4204 69A ...
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Страница 324: ...2 REV APR 1986 ...
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