JYE Tech DSO138mini User Manual page 2

14. Hook Probes
Put wire through hood cap and sold the
wire onto hook terminal as shown.
Match wire color with hook color.
Step 3
Test analog board
1. Check voltages and controls
V1
Couple switch
[Analog board
(set to GND)
ver. H shown]
VBUS
Power input
V2
(USB)
AV+
AV-
Place negative
V-
pen at GND
V+
Display and Controls
[SEN2]:
[SEN1]:
Sensitivity
Sensitivity
Selection 2
Selection 1
Horizontal
[CPL]:
Position
Couple
Selection
Signal Input
Oscilloscope
Mode
Power input
Vertical
Position
Indicator
Couple
Sensitivity
(V/div)
Timebase
(s/div)
[SEL]:
JYETech Ltd.
Parameter
- www.jyetech.com -
Selection
Finished look
[H]
References
1
Attach the main board to the
(*) Input dependent
analog board. Apply 5V DC
VBUS +5.10V
power through J7.
(*)
V+ > 3.5V
AV+ (*) > 3.5V 2
Set switch [CPL] to GND, [SEN1]
V- (*) < -3.5V
to 1V, and [SEN2] to X5.
(*)
AV- < -3.5V
3 Check voltages at the points as
V1 0V
shown in the photo.
V2 1.05V
V4
V3 2.1 V 4 Check slide switches and push-
V4
-1.05V
V3 buttons for correct operation.
5 Calibrate C4 & C6 if everything
Note:
is fine (see instructions to the
V2 - V4 could have up to
right).
+/- 0.2V variance depending
on power supply voltage.
[Analog board
Attention
ver. H shown]
1.
Power supply voltage must not exceed
8V.
Reset (by shorting
2. Allowed maximum signal input voltage
Trigger the two pads)
State is 50Vpk (100Vpp) .
Specifications
Trigger Level
Indicator
Max realtime sample rate
Analog bandwidth
Ext. Trigger In
Sensitivity range
(PB15)
Max input voltage
Input impedance
Trigger Level
(internal only)
Resolution
Trigger Record length
Source
Timebase range
Trigger modes
Trigger
Slope Trigger position range
Trigger Trigger sources
Mode
Ext. trigger thresholds
Ext. trigger input range
[OK]:
HOLD RUN Power supply
/
Current consumption
[+] and [-]:
Dimension
Parameter
Adjustment
Weight
Calibrating C4 & C6
1.
Insert hook probe to J1. Connect the red hook to the test signal
terminal J4 and leave the black hook un-connected.
2. Set [SEN1] switch to 0.1V and [SEN2] switch to X5.
Set [CPL] switch to AC or DC.
3.
Adjust timebase to 0.2ms. You should see waveform similar
to that shown in photos below. If traces are not stable adjust
trigger level (the pink triangle on right screen border) so as
you get a stable display.
4.
Turn C4 (capacitor trimmer) with a small screw driver so that
the waveform displays sharp rightangle (photo C).
5.
Set [SEN1] switch to 1V and [SEN2] switch to X1while keep all other
settings unchanged. Adjust C6 so that sharp rightangle waveform is
[J]
displayed.
A – Not enough
Operations
[SEL] button:
[+] and [-] button:
[OK] button:
[CPL] switch:
[SEN1]/[SEN2] :
More Operations
Functions
VPos Alignment
Measurements
ON/OFF
Save Waveform
1MSa/s
0 -- 200KHz
10mV/div - 5V/div
Recall Waveform
50Vpk (1X probe)
1M ohm/20pF
Default Restore
12 bits
1024 points
Center HPos
500s/Div -- 10us/Div
Auto, Normal, and Single
Center Trigger
Center (fixed)
Level
Internal/External
Send Waveform
Low: 1.1V, High: 2.2V Data
0V - 10V(max)
Toggle Test Signal
3.5V - 5V DC Amplitude
< 100mA
Calibrate Analog
85 x 75 x 15 (mm) Gain
50 gram (without probe)
Tech Support: www.jyetech.com/forum
Leave black hook
un-connected
B – Too much
Select parameter to be adjusted. The selected parameter will be highlighted.
Adjust the parameter selected by [SEL] button.
Freeze waveform refresh (entering HOLD state). Press on it again will de-freeze.
Set couple to DC, AC, or GND. When GND is selected the scope input is disconnected
from outside and connected to ground internally (0V input).
Adjust sensitivity. The product of [SEN1] and [SEN2] settings makes the
actual sensitivity which is displayed at the screen lower-left corner.
Operations
Move cursor to VPos indicator. Hold down [OK] for 3 seconds. Then follow screen prompts.
Move cursor to timebase. Hold down [OK] button for 3 seconds to turn ON or OFF on-screen
measurements including Vmax, Vmin, Vavr, Vpp, Vrms, Freq., Cycle, Pulse width, and Duty cycle.
Press [SEL] & [+] buttons simultaneously. The currently displayed waveform
will be saved to EEPROM. The existing data in EEPROM will be over-written.
Press [SEL] & [-] buttons simultaneously.
Recalled waveform is always displayed
in Hold state.
Hold down [+] and [-] buttons simultaneously for about 3 seconds.
Move cursor to the top bar. Hold down [OK] button for about 3 seconds. This will move
the display window to the center of capture buffer.
Move cursor to trigger level indicator. Hold down [OK] for 3 seconds. This will set
the trigger level to the medium value of signal amplitude.
Hold down [SEL] button for 3 seconds will send waveform data in texts via serial port
J5. The baudrate is 115200. Data format is 8N1.
Move cursor to trigger slope indicator. Hold down [OK] button for 3 seconds to toggle test signal
amplitude between 3.3V and about 0.14V. The amplitude is indicated by
Move cursor to trigger source indicator. Hold down [OK] button for 3 seconds to enter analog gain
calibration mode. Follow the on-screen instructions.
Connect red hook to
test signal output
C6 C4
[Analog board
ver. H shown]
C – Good
to screen top.
Page 2