User manual

35
Signal Generation
you would like each sample to be applied. The time is
identicalforallsamples.ThecongurablePERIOD applies
to the entire pattern and is calculated by its length
multiplied by its bit time (time of a sample). If the BURST
function is activated (ON), the instrument will pause after
each issued pattern for the duration of the IDLE TIME.
Only then will the pattern be issued again. Setting the
N-CYCLE option enables the user to issue the pattern
precisely <n> times. The sample time can be set from
20 ns to 42 s in increments of 10 ns. It will be implemented
by means of a 32 bit counter. The IDLE TIME between the
patterns can be set from 10 ns to 42 s in increments of
10 ns. It will also be implemented by means of a 32 bit
counter. Use the universal knob or the KEYPAD key in the
CURSOR/MENU control panel to enter the values.
❙ SAVE/RECALL:
The manually created pattern can be saved or recalled via
soft menu SAVE or RECALL. The pattern can be stored
internally or externally on a connected USB stick. The
pattern and the time settings will be saved.
❙ TRIGGER:
The soft menu key ARB. TRIGGER makes three possible
trigger functions available. The CONT. option (continuous
trigger) issues the pattern continuously. If the BURST
function is activated, only the IDLE TIME is applied
between the patterns. The N-CYCLE setting is voided by
the continuous output. For the EXT. (external trigger)
setting, the pattern is issued by an edge at the external
input of the oscilloscope (TRIG. EXT.). If the BURST
function is activated, the pattern will be issued <n>
times (see N-CYCLE). In addition, you are able to
determine the direction of the triggering edge. If BOTH is
selected as slope direction, both edges are of equal
value.Therstedgetriggersthepattern.Theedgesdo
not alternate. If the MAN. setting is activated, the pattern
is issued manually by pressing the respective key. If the
BURST function is activated, IDLE TIME and N-CYCLE
apply.
10.2.4 Manual
In the manual pattern mode, the modes of the individual
pins S0 to S3 are wired separately. Each pin is assigned
toaspecicsoftmenukeyandtheconditionHIGH(H)or
LOW (L) is selected.
10.2.5 BUS Signal Source
Use the pattern generator connectors on the front panel of
the instrument to generate the following BUS signals (for
measurementswithoutmeasurementobject),depending
on the setting:
❙ SPI: Data rate 100 kBit/s, 250 kBit/s or 1 MBit/s
❙ I
2
C: Data rate 100 kBit/s, 400 kBit/s, 1 MBit/s or 3.4 MBit/s
❙ UART: Data rate 9600 Bit/s, 115.2 kBit/s and 1 MBit/s
❙ CAN: up to 50 MBit/s
❙ LIN: up to 50 MBit/s
The contact at the upper left is always ground and the
signal levels are about 1 V. The following table shows how
the four outputs S1, S2, S3 and are used, depending on
the signal.
Signal S1 S2 S3 S0/
SPI Clock MOSI MISO Chip Select
I
2
C Data SDA no signal no signal Clock SCL
UART RX no signal no signal TX
CAN CAN L no signal no signal CAN H
LIN Low no signal no signal High
An information box is displayed for each operating mode,
displaying the corresponding connector assignment. By
pressing the respective soft menu key, you can open a
submenu with the bit rate setting of the selected operating
mode.
Tab. 10.3: Pin assignment of the BUS signal source
Fig. 10.2: Arbitrary pattern setup