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2T
V
2.
Input capacitance
With the aid of an input RC standardiser (Fig. 16)
(e.9. TekÍronix cat. number 011-0073-00 BNC) the
input capacitance can be adjusted to 15 pF in all
positions of SK4.
- Apply the calibration voltage of the basic oscillo-
scope to the input of the unit via the input RC
standardiser.
Adjust the input capacitance by means of the
trimmsls mentioned in the tabel below so, that
the squaÍe wave response is optimum.
Calibration
voltage
V/cm (SK4)
Trimmer
4 mV
8
20
40
80
o .2 v
0.4
0.9
2
4
8
20
0.5 mV/cm
1
2
5
10
20
50
0.1 V/cm
0.2
0.5
1
2
cl 8
C2L
c24
c29
c33
c36
c39
c43
c47
c51
c54
c58
B NC .CONNE CTOR
w4 1 0 1 9 6
BNC -C ONN ECT OR
w4 101 66
PEM 2873
Fig. 16. Input RC standardiser
U
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