3-4
SM 701730-01E
3.4
DC Offset Adjustment on the AD Board
Procedure
1.
Remove the top cover and shield cover.
2.
Allow the unit to warm up for ten minutes or more.
3.
Connect each instrument as shown in figure 3.1, “Connection Method.”
Calibrator
Programable Head
DL1720E/DL1740E/DL1740EL
Figure 3.1 Connection Method
4.
Press the SETUP key and select the Initialize soft key to execute initialization.
5.
Press the MISC key and select the Calibration soft key.
6.
Press the Cal Exec soft key to perform calibration.
7.
Enter the settings on the DL1720E/DL1740E/DL1740EL and calibrator as follows.
DL1720E/DL1740E/DL1740EL
VERTICAL (for all channels)
V/div:
2 mV/div
Probe:
1:1
Offset:
+1.000 V
Bandwidth:
20 MHz
HORIZONTAL
T/div:
1 ms/div
ACQ
Mode:
Box Average
DISPLAY
Format:
Single
MEASURE
Mode:
ON
Item Set Up:
▼
(Set to channel to be
measured) Select Avg.
Time Range 1:
–5 div
Time Range 2:
+5 div
Calibrator
DC Output Level:
+1.0000 V
8.
Adjust the variable resistor (refer to table 3.2, “Adjustment Point” and figure 3.2,
“Adjustment Point Location Diagram”) corresponding to each channel so that the
DC waveform fits within 1 V
±
1 mV as shown in figure 3.3, “Observed Waveform.”
9.
Perform the adjustment in step 7) for all channels.
Table 3.2 Adjustment Point
Channel
Adjustment Point
CH1
R707
CH2
R714
CH3*
R721
CH4*
R728
* The DL1720E is not equipped with CH3 and CH4
