Instruction Manual
Millivoltmeter
.
r”
,I_
92B
1280
PU
.
TEL:
201-
887-5110
499 POMEROY
PARSIPPANY,
l
TWX:
710-986-8241
ROAD,
PO BOX
N. J. 07054
122
TABLEOF CONTENTS
--PAGE
CHAPTER
I
II
INTRODUCTION
1.1
GENERAL
1.2
EQUIPMENT
DESCRIPTION
1.2.1
Frequency
1.2.2
Voltaqe
1.2.3
True
1.2.4
Low Noise
1.2.5
Minimal
1.2.6
DC Output
Capability
Capability
RMS Response
Zero
Adjustment
SPECIFICATIONS
12
OPERATION
III
3.1
3.1.1
3.2
IV
Operating
OPERATING
3.2.1
3.3
12
IIXSTALLATION
Controls
13
Operating
13
Procedure
14
NOTES
14
3.3.1
Overload
Limits
3.3.2
Connection
for
Measurements
Below
100 MHz
14
3.3.3
Connection
for
Measurements
Above
100 MHz
14
3.3.4
Low-Level
3.3.5
Making
the
3.3.6
Signal
Overload
3.3.7
Temperature
Effects
3.3.8
Hum, Noise,
and
15
Measurement
Zero
Adjustment
16
on 1 mV Range
16
16
Spurious
Pickup
17
3.4
DC OUTPUT
17
3.5
LOW FREQUENCY MEASUREMENTS
17
3.6
CORRECTION
3.7
CORRECTION CURVE FOR MODEL Pl-14A,
CURVE FOR MODEL Pl-8B,
50 OHM ADAPTER
50 Otll\l TEE ADAPTER
17
17
19
THEORY OF OPERATION
4.1
19
GENERAL
4.1.1
RF Probe
4.1.2
Attenuator
19
and Amplifiers
320
1280
12
Indicators
PROCEDURES
Initial
OPERATING
and
i
20
OF
TARI,E
(CONT INUW)
CONTENTS
CHAPTER
-__--
PAr;t.
--._-
4.1.3
C~ynchro~~ous
4.1.4
Shaping
4.1.5
Chopper-Driver
4.1.6
Power
4.1.7
Programming
2 II
Detector
21
Amplifier
21
Circuits
21
Supply
21
22
MAINTENANCE
',' I
22
5.1
PERIODIC
CALIBRATION
5.2
PRECAUTIONS
WIIEN CIIECKING
5.3
CALIBRATION
CflECK
23
5.4
CALIBRATIO~J
PROCEDURE
23
5.5
TROUBLESHOOTING
22
CALIBRATION
25
PROCEDURE
25
5.5.1
Cover
Removal
5.5.2
Chopper
Replacement
5.5.3
VOltSJe
and
5.5.4
Test
5.5.5
Replacement
5.5.6
Probe
25
25
Tests
KesiStanCe
26
Points
of
2 F,
RI‘ Probes
26
Tests
INTERFACE
32
6.1
INPUT CHARACTERISTICS
32
6.2
INPUT
33
6.3
ANtALCG OUTPUT
PULL-UP
33
CIIARTS AND DRAWINGS
--PAGE
Inpu t Resistance
Input
of
Capacitance
RF Probe
vs
Input
as a Function
Level
of
Input
of
Zlodel
91-12F
Leve 1 and Frequency
Probe
Typical
SWR of
Model
91-12F
RI Probe
with
Model
91-8B
Typical
SWR of
Model
9l-12F
RF Probe
with
Model
91-14A
and Model
Assembly
91-15A
of
I.lodel
Model
91-8B
Model
91-14A
Block
Diagram
Calibration
Frequency
Type
50 9 BNC Adapter
Type
N Tee Adapter
at
10 MHz1 11
50 c Adapter
Type
N
11
Tee Adapter
11
50 :2 Termination
91-14A
(Pleasured
10
N Tee
15
Adapter
Correction
Curve
Correction
Curve
ia
18
19
24
Instructions
Response
Test
30
Setup
ii
CHARTS AND DRAWINGS
a.“*
(CONTINUED)
PAGE
--_-
FIGURE --NO.
-__
10
Swept
Frequency
11
Pin
12
External
Response
Test
31
Setup
32
Designations
33
Connections
Endpapers
SCHEMATICS
TABLES
PAGE
Required
Accessories
Crest
I‘actors
Model
920
Connection
TABLE
9
Controls
and
12
Indicators
15
Recommendations
OF REPLACEABLE
34
PARTS
iii
CFtAPT-ER
I
1iJTRODUCTIO:S
1.1
GENERAL
The
low
It
Elodcl
radio
is
92 Series
frequencies
input
approaching
of
a sine
wave
above
and output
sard-eL1<lc
;i linear
at
dc
high
range
sensitivity
excellent
for
level.
a voltage
readout
of
and
stability,
input
is
low
3 volts.
noise.
30 millivolts,
calibrated
from
characterized
accuracy,
up to
however,
measurements
200 UV to
and
signals
The meter,
of
gradually
to
indicate
30 mV.
the
output,
connector.
2),
response
this
an accurate
over
of
1 and
rms
connections
connector
a rear
Figures
true
above
region,
instrument
(see
92 exhibits
provides
gigahertz
solid-state
peak-to-peak
Input
.it
the
impedance
The Model
nns
to
a proqrammable,
by Iliqh
RF Millivoltmeter
rear
whose
This
for
of
external
the
level
control
and
readou
t are
provided
by a 22-pin
instrument.
is
may be used
proportional
to
drive
to
the
rf
a recorder,
input
voltage,
remote
indicator,
also
provided
or other
is
analog
.levices.
The
T:,I;ical
92 offers
uses
In
of
a convenient
this
transistor
and accurate
instrument
testing
means
for
making
a wide
variety
of
measurements.
include:
the
instrument
may be used
to measure
0,
ft,
and other
transistor
parameters.
SWR
couplers,
stage
and
qain,
and
factors,
Proper
The
loss
measurement
and adjustable
~aln
is
return
and
loss
adjustment
adjustment,
slotted
measurements
flatness
other
or
of
the
using
the
Model
with
bridge
methods,
in wide-band
pass
band,
amplifiers,
upper
cut-off
including
or
such
corner
design
frequency,
characteristics
negative
parameters.
of
tuned
measurement
directional
lines.
circuits
of
in
performance,
narrow-band
and
92c
1280
92 Series
1
amplifiers.
evaluation
of
rf
filter
parameters.
feedback
the