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Table IV Attenuator Pad Resistance Values
E
R
S
g i
n
l a
A
m
o
u
t n
f o
L
v e
l e
t A
e t
n
u
a
o i t
n
1
%
1 -
8
d
B
u
N
o
n
e
-
- -
8 -
d
B
u
1
0
d
B
1
5
4
4 -
d
B
u
1
4
d
B
2
0
0
0
d
B
u
1
8
d
B
2
3
2
+
1
0
d
B
u
2
8
d
B
2
7
4
E
e l
R
S
g i
n
l a
A
m
o
u
t n
f o
L
v e
l e
t A
e t
n
u
a
o i t
n
1
%
2 -
8
d
B
u
N
o
n
e
-
- -
1 -
8
d
B
u
1
0
d
B
1
5
4
8 -
d
B
u
2
0
d
B
2
4
3
4 -
d
B
u
2
4
d
B
2
6
1
0
d
B
u
2
8
d
B
2
7
4
+
1
0
d
B
u
3
8
d
B
2
9
4
Figure 5. Typical Input Module Connections
e l
t c
o r
i n
a c
y l l
B
a
a l
n
e c
d
n I
p
t u
1
R
s e
t s i
r o
V
a
u l
s e
f
r o
P
a
d
(
n i
o
h
1
R
2
5
%
1
%
5
%
1
%
-
- -
-
- -
-
- -
-
- -
1
5
0
4
2
2
4
3
0
6
0
4
2
0
0
2
4
9
2
4
0
6
0
4
2
4
0
1
5
4
1
5
0
6
0
4
2
7
0
4
7
5 .
4
7
6
0
4
t c
o r
i n
a c
y l l
B
a
a l
n
e c
d
n I
p
t u
1
7
R
s e
t s i
r o
V
a
u l
s e
f
r o
P
a
d
(
n i
o
h
1
R
2
5
%
1
%
5
%
1
%
-
- -
-
- -
-
- -
-
- -
1
5
0
4
2
2
4
3
0
6
0
4
2
4
0
1
2
1
1
2
0
6
0
4
2
7
0
7
5
7
5
6
0
4
2
7
0
4
7
5 .
4
7
6
0
4
3
0
0
1
5
1
5
6
0
4
SPECIFICATIONS
7
8
1
A
1781A PROGRAMMABLE INPUT MODULE
m
) s
Gain: .............................. 0 dB to 50 dB, continuously variable
R
3
Input Sensitivity:
5
%
(Ref. 1 kHz, 0 dBr = 100 mVrms output, 10 kQ load)
-
- -
Without 1785A: ....................... 0.3 mVrms to 100 mVrms
6
2
0
With 1785A: .............................. 0.1 mVrms to 30 mVrms
6
2
0
6
2
0
Input Impedance: (Ref. 1 kHz)
6
2
0
Electronically balanced: ..................................... >8 kohm
8
1
A
T
Transformer balanced: .................... 200 ohm to 600 ohm
m
) s
With 1793 installed: ......................................... >39 kohm
R
3
Frequency Response: (Ref. 1 kHz, 100 mVrms output, 10
kohm load)
5
%
Without 1785A:
-
- -
±1 dB (Minimum gain): .......................... 20 Hz to 40 kHz
6
2
0
±1 dB (Maximum gain): ......................... 50 Hz to 40 kHz
6
2
0
±3 dB (Minimum gain): .......................... 10 Hz to 80 kHz
6
2
0
±3 dB (Maximum gain): ......................... 25 Hz to 80 kHz
6
2
0
With 1785A:
±1 dB (Minimum gain): .......................... 20 Hz to 25 kHz
6
2
0
±1 dB (Maxim.um gain): ........................ 40 Hz to 15 kHz
±3 dB (Minimum gain): .......................... 10 Hz to 50 kHz
±3 dB (Maximum gain): ......................... 20 Hz to 30 kHz
Total Harmonic Distortion (THD):
(Ref. I kHz, 100 mVrms output, minimum gain, 10 kL2 load, 30
kHz low pass filter)
20 Hz to 20 kHz: .................................................. <0.03%
Equivalent Input Noise: ........................................ <-120 dBr
(Ref. 0 dBr = 100 mVrms output, 10 kohm load, 2000 ohm input
termination maximum gain, A-weighted)
13
10 dB to 60 dB w/1785A
(-50 dBr to 0 dBr)
(-60 dBr or -10 dBr)
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