YOKOGAWA DL7440

9-29
IM 701450-01E
9
Waveform Computation
D/A Conversion of the Logic Data
The logic data measured using the logic probe is handled as digital data of 8 bits or less
or 12 bits or less, and an analog waveform is displayed through D/A conversion.
The DA8 and DA12 operators are available on DL7400 firmware version 2.16 or later.
The C-DA operator is available on version 2.40 or later.
• For Pod A and Pod B, A0 and B0 are assumed to be the highest bits and A7 and B7
are assumed to be the lowest bits.
• L1 and L2 indicate Pod A and Pod B, respectively.
• Performs D/A conversion on the logic data of the specified number of bits from the
lowest bit.
• DA8 is set using the syntax DA8(Ly,Z8).
Ly L1 or L2
Z8 (number of bits) 1 to 8
• DA12 is set using the syntax DA12(Lx,Ly,Z10).
Lx (higher bits) L1 or L2, The highest 4 bits of Lx are always discarded.
Ly (lower bits) L1 or L2
Z10 (number of bits) 9 to 12
• C-DA is set using the syntax C-DA(Lx,Ly,Z,W).
Lx (higher bits) L1 or L2, The highest 4 bits of Lx are always discarded.
Ly (lower bits) L1 or L2
Z (number of bits) 1 to 12
W (slope of the clock) 0 (rising edge), 1 (falling edge), 2 (both rising and falling edges)
The highest bit of Lx (A0 or B0) is detected as the clock bit. The logic
data is sampled by synchronizing to this clock.
Example 1: Apply the clock (rising edge) to Pod A and perform D/A
conversion on 8 bits of the Pod B data.
C-DA(L1,L2,8,0)
Example 2: Apply the clock (falling edge) to Pod A and perform D/A
conversion on 7 bits of the Pod B data.
C-DA(L1,L1,7,1)
• The scaling is fixed to Auto. Manual scaling is not possible. The center and sensitive
values according to the number of bits are as follows:
Bit Length Center Sensitivity Significant Bits (Higher) Significant Bits
(Lower)
12 bits 2.0480E+03 7.6800E+02 X4 to X7 Y0 to Y7
11 bits 1.0240E+03 3.8400E+02 X5 to X7 Y0 to Y7
10 bits 5.1200E+02 1.9200E+02 X6 to X7 Y0 to Y7
9 bits2.5600E+02 9.6000E+01 X7 Y0 to Y7
8 bits1.28000E+02 4.8000E+01 – Y0 to Y7
7 bits6.4000E+01 2.4000E+01 – Y1 to Y7
6 bits3.2000E+01 1.2000E+01 – Y2 to Y7
5 bits1.6000E+01 6.0000E+00 – Y3 to Y7
4 bits8.0000E+00 3.0000E+00 – Y4 to Y7
3 bits4.0000E+00 1.5000E+00 – Y5 to Y7
2 bits2.0000E+00 7.5000E–01 – Y6 to Y7
1 bit 1.0000E+00 3.7500E-01 – Y7
X, Y = A or B
Maximum Record Length That Can Be Computed
The operation is the same as for addition, subtraction, and multiplication. See section
9.2. However, the maximum number of computed points is 2 MW. The computation
range is set by specifying the computation start point and the computation end point (see
page 9-26).
9.9 Performing User-Defined Computation (Optional)