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(8)
Set the Function Switch to FREQUENCY 'B'.
(9)
Repeat operation (6) but in accordance with details in Table 4.
TABLE 4
9059 Channel 'B' Sensitivity Check
Push Button Range Switch
Input Frequencies
Remarks
'
1s
kHz (3)
Greater than 40 MHz
Sensitivity Switch
(check overflow lamp
set to 0. 01 - 1 OV.
illuminated)
>
lOOms MHz (2)
40 MHz to 90 MHz
Input level to be
lOms MHz
(1)
100 MHz to 500 MHz
not higher than
lOmV r.m.s.
lOmS MHz (1)
500 MHz to 560 MHz
Input Level to be
not higher than
40mV r.m.s.
SETTING UP THE SCHMITT TRIGGER (Ql4 and Ql5 Amplifier and High Speed Decade)
6.16
9057/9059
Equipment Required:
Signal Generator
'T' Piece and 500 load.
Procedure
(1)
Connect the signal generator to the 9057 input socket (9059 Channel 'A')
and apply a signal of 10 MHz at a level of 1
0
mY.
(2)
Set the S
I
ide Switch Attenuator to 0. 01 - 1 OV.
(3)
Set the Function Switch to FREQUENCY or FREQUENCY 'A'.
(4)
If necessary adjust R26 on the Amplifier and High Speed Decade Assembly
for a stable display. (Refer to Fig.2.4).
(5)
Slowly reduce the input from the signal generator until the Schmitt Trigger
fai Is to operate and the display becomes erratic.
(6)
Carefully re-adjust R26 unti I the Schmitt Trigger action recommences and
the display is stabilized.
6-7
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