YOKOGAWA DL 1540, User Manual

Page: 44 / 201

5-8 IM 701510-01E
5.7 Selecting the Timebase
1.
Press the
MISC key
to display the MISC menu.
2.
Press the “
Time Base...
” soft key to display the timebase setting
menu.
3.
Select the required timebase by pressing the corresponding soft key.
“
EXT CH4
” menu is available on DL1540/DL1540L.
4. In case you selected “ EXT IN ” or “ EXT CH4 ”, use the rotary knob to
set the required threshold level. “
EXT CH4
” menu is available on
DL1540/DL1540L.
Explanation
Selectable Timebases
Timebase can be selected from the following three types.
INT
Internal clock signal
EXT IN
Clock signal input to the EXT TRIG IN/EXT CLOCK IN terminal
EXT CH4
Clock signal input to the CH4 input terminal
(Available on DL1540/DL1540L)
When “EXT IN” is selected
Input a clock signal to the EXT TRIG IN/EXT CLOCK IN terminal on the rear panel (for
DL1520/DL1520L, EXT TRIG terminal on the front panel). The clock signal must conform
to the specifications given below.
• For DL1520/DL1520L
Item Specifications
Connector type BNC
Maximum input voltage 250 V(DC+ACpeak) or 177 Vrms, when the
frequency is 1 kHz or below, (CAT I and II)
Input band DC to 100 MHz
Fequency range of external 40 Hz to 80 MHz
clock
Input range 2 ranges ( ± 10 V and ± 1 V)
Input level range ± 10 V range: –10 V to + 10 V in steps of 40 mV
(Probe attenuation ratio 1:1) ± 1 V range: –1 V to + 1 V in steps of 4 mV
Input sensitivity 2 Vp-p ( ± 10V range)
(Probe attenuation ratio 1:1) 200 mVp-p ( ± 1V range)
Input coupling AC/DC
HF rejection Bandwidth limit (approx. DC to 15 kHz)
for the input signal can be turned ON/OFF.
Input impedance Approx. 1 M Ω (same as section 16.1)
• For DL1540/DL1540L
Item Specifications
Connector type BNC
Maximum input voltage ± 6 V
Frequency range 40 Hz to 15 MHz
Input level TTL/CMOS level recommended
0.3 Vp-p or greater when measured
at the end of the connector
± 0.15 V or greater relative to the
threshold level
Input impedance Approx. 1 M Ω
Threshold level 1.5 V or 0.15 V
Minimum pulse width 25 ns or more for both
High and Low levels
Keys and Procedure
MISC key
Rotary knob
Soft keys
Input terminal
Example
(DL1540/DL1540L)
EXT CLOCK IN
EXT TRIG IN
± 6V MAX 1M Ω
!