CIRCUIT
DESCRIPTIONS
3-29
METER 0/
-N-
modes
Sr1a Sr2a Sr3a Sr4a SgndBb Srib
CO
Sr3b
Sf4b
'
SgndSa mV OHM
300 Ohm 0 0 0 t 1 0 0
D
1 1 0
D
3 KOhm
D
0 0 1 1
D
0
D
1 1 0 1
30 KOhm
DDD
1 1
D
0 0 1 1
D
1
300 KOhm
O
0
O
1 1 0 0 0 1 1 0 1
3MOhm 0 0 0
D
1 0 0 0
1 1
0
1
30 MOhm
D
0 0
D
1 0
1 0 1 1
D
1
Diode 0 0 0
D
1 0
1
0
D
1
0
1
Scl5 Scie Sc17 Scia
300 Ohm
a
0 1 1
3 KOhm 1
D
1
D
30 KOhm
1
0 0 0
300 KOhm 1 1 0 0
3 MOhm
D
1
DD
30 MOhm
D Oa
Diode
—
“I
1 0 1 1
BUZ
Buzzer off 1
Buzzer on 0
G.OUTP
Ext. Trig. 0
Generator 1
SCOPE mode
Attenuator settings
METER mode
>
20 mV/dlv 5 lOmV/dlv
D-POSCHA 0 1 1
D-POSCHB 1 1 X
While the Scope
Meter Is operating
In
METER mode or when the Instrument Is calibrated, the signals
SI, mV, OHM, Srib, Sr2b, St3b, Sr4b, and D.POSCHB can
change ("hlgn/tow"). signals Ex and Ey
are used to switch the relays. Both signals
are "high*
when
the relays are not operated.
Signals
Sg4a, Sg5a, Sg6a,
and SgTasetthe LF. gain for channel A. Sg^, SgSb, Sg6b, and Sg7b
set the LF. gain for charnel B. (Sg4b) Is the most significant bit (MSB), Sg7a (Sg7b) Is the
least
slgr^lfleant bit (LSB).
Signals Sol Ob, Sot 1b, SOI 2b, Sol 3b, and So 14b are used to set the offset compensation In the
preamplifier circuits of channel A. Signals Sc15, Sc16, Sc
17,
Sc18, and SO14a are used to set the
offset
compensation
in the preamplifier circuits of channel B. SOI Ob (Sets) is the most slgr^flcant bit
(MSB), Sol 4b (Sol 4a) is the
least significant bit (LSB).
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