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Operating Instructions— 2236 Service
OPERATING CONSIDERATIONS
GRATICULE
The graticule is internally marked on the faceplate of the
crt to enable accurate measurements without parallax error
(see Figure 2-10). It is marked with eight vertical and ten
horizontal major divisions. Each major division is divided
into five subdivisions. The vertical deflection factors and
horizontal timing are calibrated to the graticule so that
accurate measurements can be made directly from the crt.
Also, percentage markers for the measurement of rise and
fall times are located on the left side of the graticule.
GROUNDING
The most reliable signal measurements are made when
the 2236 and the unit under test are connected by a
common reference (ground lead), in addition to the signal
lead or probe. The probe’s ground lead provides the best
grounding method for signal interconnection and ensures
the maximum amount of signal-lead shielding in the probe
cable. A separate ground lead can also be connected from
the unit under test to the oscilloscope GND connector
located on the front panel.
For floating Multimeter measurements the —(negative)
connector (located on the right side panel) should be
connected to the lower impedance point of the unit-under
test being measured, to minimize loading.
SIGNAL CONNECTIONS
Generally, probes offer the most convenient means of
connecting an input signal to the instrument. They are
shielded to prevent pickup of electromagnetic interference,
and the supplied 10X probe offers a high input impedance
that minimizes circuit loading. This allows the circuit under
test to operate with a minimum of change from its normal
condition as measurements are being made.
Coaxial cables may also be used to connect signals to
the input connectors, but they may have considerable effect
on the accuracy of a displayed waveform. To maintain the
original frequency characteristics of an applied signal, only
high-quality, low-loss coaxial cables should be used.
Coaxial cables should be terminated at both ends in their
characteristic impedance. If this is not possible, use suitable
impedance-matching devices.
1ST OR LEFT
11TH OR RIGHT
VERTICAL
VERTICAL
GRATICULE
GRATICULE
LINE
L I N E /
/,
)
-
-
RISE A N D
FALL TIM E
M E A S U R E M E N T
PERCENTAGE
M ARKERS
™
CENTER
„ u
HORIZONTAL
r lJ :..
GRATICULE
rlCAL
LINE
ICULE
NE
4 2 0 7 - 0 9
Fig. 2-10. Graticule measurement markings.
INPUT COUPLING CAPACITOR
PRECHARGING
When the Input Coupling switch is set to GND, the input
signal is connected to ground through the input coupling
capacitor in series with a 1-MS2 resistor to form a
precharging network. This network allows the input coupling
capacitor to charge to the average dc-voltage level of the
signal applied to the probe. Thus any large voltage
transients that may accidentally be generated will not be
applied to the amplifier input when the Input Coupling switch
is moved from GND to AC. The precharging network also
provides a measure of protection to the external circuitry by
reducing the current levels that can be drawn from the ex
ternal circuitry during capacitor charging.
The following procedure should be used whenever the
probe tip is connected to a signal source having a different
2-11
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 ...
Страница 317: ...A 10 C O U N T E R T IM E R M U L T IM E T E R B O A R D A D J U S T M E N T LO C A T IO N S ...
Страница 319: ...2236 Service TROUBLESHOOTING GUIDE 4206 99 4204 69A ...
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