Operating Information— 2230 Service
components at or near the circuit’s resonant frequency.
Oscillations (ringing) can then appear on the oscilloscope
waveform display and distort the true signal waveshape.
Always Keep both the ground lead and the probe signal-
input connections as short as possible to maintain the
best waveform fidelity.
Misadjustment of probe compensation is a common
source of measurement error. Due to variations in oscillo
scope input characteristics, probe compensation should be
checked and adjusted, if necessary, whenever the probe is
moved from one oscilloscope to another or between chan
nels.
See the probe compensation
procedure
in
•Operator’s Check and Adjustments', or consult the
instructions supplied with the probe.
Coaxial Cables
Cables may also be used to connect signals to the ver
tical input connectors, but they may have considerable
effect on the accuracy of a displayed waveform. To main
tain the original frequency characteristics of an applied sig
nal, 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.
INPUT-COUPLING
CAPACITOR PRECHARGING
When the Input Coupling switch is set to the GND posi
tion, the input signal is connected to ground through the
input-coupling capacitor and a high resistance value. This
series combination forms a precharging circuit that allows
the input-coupling capacitor to charge to the average dc
voltage level of the signal applied to the input connector.
Thus, any large voltage transients that may accidentally be
generated are not applied to the vertical amplifier’s input
when the input coupling is switched from GND to AC. The
precharging network also provides a measure of protection
to the external circuitry by reducing the current level that
is drawn from the external circuitry while the input
coupling capacitor is charging.
If AC input coupling is in use, the following procedure
should be followed whenever the probe tip is connected to
a signal source having a different dc level than that previ
ously applied. This procedure becomes especially useful if
the dc-level difference is more than ten times the
VOLTS/DIV switch setting.
1. Set the AC-GND-DC (input coupling) switch to GND
before connecting the probe tip to a signal source.
2. Touch the probe tip to the oscilloscope GND con
nector.
3. Wait several seconds for the input-coupling capaci
tor to discharge.
4. Connect the probe tip to the signal source.
5. Wait several seconds for the input-coupling capaci
tor to charge to the dc level of the signal source.
6. Set the AC-GND-DC switch to AC. A signal with a
large dc component can now be vertically positioned within
the graticule area, and the ac component of the signal can
be measured in the normal manner.
2-24
Summary of Contents for 2230
Page 12: ...2230 Service X The 2230 Digital Storage Oscilloscope 4998 01 ...
Page 33: ...Operating Information 2230 Service Figure 2 5 Vertical controls and connectors 2 6 ...
Page 48: ...Operating Information 2230 Service Figure 2 11 X Y Plotter interfacing ...
Page 56: ...Theory of Operation 2230 Service 4999 01 3 2 Figure 3 1 Simplified block diagram ...
Page 68: ...Operating Information 2230 Service Figure 2 11 X Y Plotter interfacing ...
Page 76: ...Theory of Operation 2230 Service 4999 01 3 2 Figure 3 1 Simplified block diagram ...
Page 98: ...Theory of Operation 2230 Service 499 9 06 Figure 3 6 Horizontal Amplifier block diagram 3 24 ...
Page 111: ...Theory of Operation 2230 Service 3 37 Figure 3 9 Acquisition Memory timing ...
Page 190: ...Maintenance 2230 Service 999 14 Figure 6 3 Isolated kernel timing 6 9 ...
Page 329: ...PUT Figure 9 2 S em ico n d u cto r lea d co n fig u ratio n s ...
Page 332: ...2230Service CHASSIS MOUNTED PARTS ...
Page 334: ...A14 CH 1 LOGIC BOARD ...
Page 337: ......
Page 344: ...u sr z z o 1 ...
Page 347: ...i n 5 a O Q q o u S a o h UJ s a b c d e f g h j k l m n ...
Page 352: ......
Page 355: ...WAVEFORMS FOR DIAGRAM 5 4999 83 ...
Page 358: ...I W L U O U rc a 4 2 s ...
Page 361: ...WAVEFORMS FOR DIAGRAM 6 S 84 ...
Page 362: ...2230 Service TEST SCOPE TRIGGERED ON U665 PIN 8 FOR WAVEFORMS 31 THROUGH 33 ...
Page 365: ... I I ...
Page 366: ...A 1 6 S W E E P R EFEREN CE BOARD FIG 9 17 2230 Service Figure 9 17 A16 Sweep Reference board ...
Page 369: ... o 0 UJU sa eg aiu c u J in su eg 5 C sis n g e s o N QO ...
Page 371: ...Static Sensitive Devices See Maintenance Section CM I rv CD o 2230 Service ...
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Page 384: ... I I c o C u o a 5 r O tD v j If 3 IV if I I ci if 5 3 I ...
Page 386: ......
Page 388: ...H K L M N 7 8 8 2 2 3 0 INPUT OUTFUT WIRING INTERCONNECT ...
Page 392: ...W A V E F O R M S F O R D IA G R A M 14 ...
Page 393: ...2230Service 0 0 d s t 4 9 9 9 9 5 ...
Page 394: ...2230 Service TEST SCOPE TRIGGERED ON U911 PIN 21 FOR WAVEFORMS 64 THROUGH 69 4999 92 ...
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Page 397: ...WAVEFORMS FOR DIAGRAM 15 TEST SCOPE TRIGGERED ON U9111 PIN 21 FOR WAVEFORMS 70 THROUGH 77 ...
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Page 415: ...IMF PU TPR A IR TM FQ U I W A V E F O R M SF O RO IA G R A M1 5 W A V E F O R M SF O R i ...
Page 417: ...4999 9S ...
Page 419: ...i s 5 0 C C p F 2 CC p 2 a u 4 I s c c O 2 e e o 5 a o 5 i 2 i f 2 E C 52 ...
Page 423: ...W A V E F O R M SF O RD IA G R A M1 8 O c n ...
Page 424: ...Figure 9 22 A11A1 Input Output board ...
Page 430: ...Figure 9 23 A11A2 Vector Generator board ...
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Page 437: ...22 3 0 S ervice W A V E F O R M S F O R D I A G R A M 2 1 m f n h ...
Page 442: ...WAVEFORMS FOR DIAGRAM 22 4999 78 ...
Page 443: ...XY PLOTTER BOARD DIAGRAM 22 See Parts List for serial number ranges ...
Page 447: ...A21 RS 232 OPTION BOARD Flfi A 9 K 01 01 W M ...
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Page 452: ...COMPONENT NUMBER EXAMPLE ...
Page 459: ...A16 SWEEP REFERENCE ADJUSTMENT LOCATION ...
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