Operating Instructions— 2236 Service
PROBE COMPENSATION
Channel 1 and Channel 2
Misadjustment of probe compensation is one of the
source of measurement error. Most attenuator probes are
equipped with a compensation adjustment. To ensure opti
mum measurement accuracy, always compensate the oscil
loscope probes before making measurements. Probe
compensation is accomplished as follows:
1. Preset instrument controls and obtain a baseline trace.
2. Connect the two 10X probes (supplied with the instru
ment) to the CH 1 and CH 2 input connectors.
2. Connect the two 10X probes (supplied with the instru
ment) to the CH 1 and CH 2 input connectors.
3. Set both VOLTS/DIV switches to 10 mV and set both
Input Coupling switches to AC.
4. Select CH 2 VERTICAL MODE and insert the tip of the
Channel 2 probe into the PROBE ADJUST output jack.
5. Using the approximately 1-kHz PROBE ADJUST
square-wave signal as the input, obtain a 5-division display
of the signal.
6. Set the A SEC/DIV switch to display several cycles of
the PROBE ADJUST signal, use the Channel 2 POSITION
control to vertically center the display.
7. Check the waveform presentation for overshoot and
rolloff (see Figure 2-11). If necessary, adjust the probe com
pensation for flat tops on the waveforms. Refer to the in
structions supplied with the probe for details of
compensation adjustment.
8. Select CH 1 VERTICAL MODE and connect the Chan
nel 1 probe tip to the PROBE ADJUST output jack.
C O R R EC T
(FLAT)
U N D E R CO M *
PE NS ATED
(ROLLOFF)
OVER C O M -
PE N S ATED
(O VERSHO OT)
V -
y r
4 2 0 7 - 1 1
Fig. 2-11. Probe compensation.
9. Use the Channel 1 POSITION to vertically center the
display and repeat step 7 for the Channel 2 probe.
NOTE
Channel 1 ac rms volts measurement accuracy above
1kHz depends directly upon the precision with which
the preceding adjustment is performed. An overshoot
of 0.2 division (or 4% of a 5-division display) will add
approximately 4% to the displayed reading. Com
pensation related errors can be reduced to 1/2% or
less by carefully adjusting the probe compensation to
the PROBE ADJUST square-wave signal.
Channel 1 AC RMSV
Best measurement accuracy above 1 kHz with a 10X
probe can be accomplished by adjusting the probe with the
aid of a precision Ac Calibration System. Probe compensa
tion is accomplished as follows:
The equipment listed in Table 2-3, or equivalent equip
ment, is required to compensate the 10X probe for ac rms
volts measurement.
2-15
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 ...
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Страница 319: ...2236 Service TROUBLESHOOTING GUIDE 4206 99 4204 69A ...
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