JYE Tech DSO 138 User manual

:
330pF
DC005
:
J10
:
:

22.LCDBoard
2
3
1
- www.jyetech.com -
Yes
2
NOTE:

HowtoUse
DisplayandControls
ProbeCalibration
Because there isalwayssome capacitance between scope inputand
groundprobe needsto be calibratedto achieve bettermeasurement
resultsforhigh frequency signals.Thiscanbe done with the help of
the built-in testsignal.Todo thisplease followthe stepsbelow.
Connectredclipto
test signaloutput
Leaveblackclip
un-connected
Connectthe redcliptothetestsignalterminalandleave the
blackclipun-connected(see photoatright).
1.
Set[SEN1]switchto0.1Vand[SEN2]switchtoX5.
Set[CPL]switchtoACorDC.
2.
Adjusttimebaseto0.2ms.Youshouldsee waveformsimilar
tothatshowninphotos below. Iftraces arenotstable adjust
triggerlevel(the pinktriangle onrightscreenborder)soas
yougeta stable display.
3.
TurnC4(capacitortrimmer)withasmallscrewdriversothat
the waveform displays sharprightangle (photoC).
4.
C4
C6
Set[SEN1]switchto1Vand[SEN2]switchtoX1whilekeepallother
settings unchanged.AdjustC6sothatshartrightanglewaveform is
displayed.
5.

54321
A
-
+
5V
86V. -.14V
64V.
**
93V.
*
+5VV+ TP24
J10
L2
1mH/1A 79L05/TO92J9
1
2
U5
TP20
+
C25
100uF
R38
1.5K
+
100uF
D2
1N4004
LM1117-3.3/TO263
GND
L3
100uH
10K
+
100uF