General Information Model
8901B
Table
1-1.
Specifications
(4
of
6)
23
counts of least-significant digit
+Internal Reference Accuracy
20.02
Hz
t
Internal Reference Accuracy
-0.2
HZ
2
Internal Reference Accuracy
(3
kHz
low-pass filter inserted)
Audio Frequency Counter
FREQUENCY RANGE:
MAXIMUM EXTERNAL INPUT VOLTAGE:
3Vrms.
Accuracy (For Demodulated Signal~l:'~
20
Hz
to 250
kHz.
(Usable to
600
kHz.1
AM
210%
>1
kHz
FM
21.0 kHz
@M
2
1.5
radians
AM
210%
FM
2
1.0 kHz
@M
21.5
radians
1.5%
d
AM
<
10%
0
15 kHz
5
FM
<
1.0
kHz
0
15
radian
d
@M
dl
kHz
53
kHz
<
1
5
radians
I
Accuracy
I
Frequency
I
Modulation (Peak)
I
~
Accuracy
+3
counts of least-significant digit
+Internal Reference
Frequency Level
>1
kHz 2100
mV,,,
Accuracy (For External Signals):11
20.02
Hz
51
kHz
z
Internal Reference Accuracy
rlOO
mVrms
Supplemental Characteristics:
DISPLAYED RESOLUTION:
6
digits.
MEASUREMENT RATE:
2
reading+.
COUNTING TECHNIQUE:
AUDIO INPUT IMPEDANCE:
100
kR
nominal.
Reciprocal with internal
10
MHz
time
base.
Audio Distortion
FUNDAMENTAL FREQUENCIES:
MAXIMUM EXTERNAL INPUT VOLTAGE:
3V.
DISPLAY RANGE:
DISPLAYED RESOLUTION:
0.01%
or
0.01
dB.
ACCURACY:
2
1
dB of reading.
SENSITIVITY:
400
Hz
2
5%
and
1
kHz
25%.
0.01%
to
IOO.Ooio
(-80.00
dB
to
0.00
dB).
Modulation:
0.15
kHz
peak
FLI.
1.5%
peak
AM
or
External:
100
myrms.
RESIDUAL NOISE AND DIST0RTIONI3:
0.3'0
(-50
dB).
temperature
<4O0C.
0.6
radian peak
&XI.
Supplemental Characteristics:
MEASUREMENT
3
dB BANDWIDTH:
20
Hz
to
50
kHz.
DETECTION:
True
rrns.
MEASUREMENT RATE:
I
rradinp/s.
AUDIO INPC'T IMPEDA'VCE:
100
k!!
nominal.
Audio
RMS
Level
FREQUENCY RANGE:
50
Hz
to
40
kHz.
VOLTAGE RANGE:
100 mV
to
3V.
ACCURACY:
2
4.0%
of
reading.
Supplemental Characteristics:
FULL RANGE DISPLAY: .3000V, 4.000v.
AC CONVERTER: true-rms responding for signals with
MEASUREMENT RATE:
2
reading+.
AUDIO INPUT IMPEDANCE:
100
kR
nominal.
crest factor of
13.
Audio Filters
DE-EMPHASIS FILTERS:
25
ps,
50
ps,
75
ps,
and
750
ps.
De-emphasis filters are single-pole, low-pass
filters with
3
dB frequencies
of
6366
Hz
for 25
ps,
3183
Hz
for
50
ps.
2122
Hz
for
75
gs.
and 212
Hz
for
750
gs.
Flatness:
at rates? 200
Hz.
Flatness:
<I% at rates?
1
kHz.
Flatness:
<I%
at rates
11
kHz.
Flatness:
<I%
at rates
510
kHz.
Flatness:
<I%
at rates
110
kHz.
50
HZ HIGH-PASS FILTER
(2
POLE):
300
HZ HIGH-PASS FILTER
(2
POLE]:
3
kHz LOW-PASS FILTER
(5
POLE):
15
kHz LOW-PASS FILTER
(5
POLE):
>20
kHz LOW-PASS FILTER
(9
POLE BESSEL)I4:
Supplemental Characteristics:
~~
DE-EMPHASIS FILTER TIME CONSTANT
ACCURACY:
23%.
HIGH PASS AND LOW
PASS
FILTER
3
dB
FREQUENCY ACCURACY:
23%.
>20
kHz LOW PASS FILTER:
OVERSHOOT ON SQUARE WAVE MODULATION":
3
dB
Cutoff
Frequency:
100
kHz
nominal.
<IO/b.
12
I\'ith
the
loi~.pass
and
high-puss
audio
fillers used
lo
stabilize
frequency
readings.
13
For
dernodulol~d
signals.
the
residuol
noise
generaled
b!.
the
8901B
must
br
uccounled
for
in
distortion
measuremrnts
ii.e
residual
A.M.
F.M
or
o.\l
j
14
The
>?O
iHz
lon.pass filter
is
intended
for
minimum
overshoot
with
squurwoix=
nodulotion
1-22
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