Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 151 151(Model151Microvoltmeter)
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download 151(Model151Microvoltmeter) documenatation <<
Text preview - extract from the document
INSTRUCTION MANUAL
MODEL 151
MICROVOLTMETER
CONTENTS
SECTION
INTRODUCTION I
SPJXIFICATIONS II
Ranges
Accuracy
Input Xesl3t3ncs
Overvoltage
Zero Adjust
Noise
Zero Drift
Response Speed
Input Rejection
In-Phase Rejection
Impedance
output
Tube Complement
power
Connector3
Accessories Supplied
Dimension3
OPERATION III
Operating Control3
Preliminary Set Up
Operation
CIRCUIT DESCRIPTION Iv
Input Circuit
AC Amplifier
Demodulator Circuit
DC Amplifier
Loop Description
Power Supply
MAINTENANCE
General
Trouble Shooting Procedure
Replaceable Part3 List
Voltage Resistance Diagram
Circuit Schematic
151
0763
SECTION 1 - INTRODUCTION
The Keithley Model 151 Null Detector is a stable, low-level DC
amolimwith high-~<~utesistance and low noise. Careful shielding.
fiitering, and gu&di.nk permit floating operation, as in a bridge nuli-
detector, with excellent rejection to extraneous voltages.
With a power sensitivity of lo-l7 watt, a re3pon3e speed of ""3
second, lack of overshoot and a zero-centered meter, the 151 may be used
,;n applications Inhere a suspension galvanometer might be employed, or
in other applicaticns where a galvanometer is not sufficiently sensitive,
fast or rugged.
Five non-linear ranges are provided which have the same center-
scale sensitiv'ty as the linear ranges, but are compressed in a quasi-
logarithmi: way to three decade3 on each range. The3.e range3 permit
speedier null-searching th3.n the l~inear scales, without sncrlfizing
sensitivity at null.
Two zero controls for opera 2.r.d short-circuit inputs ai~low prop3r
zeroin,- for any Source resistance even in the presence of Bridge thermal
emfts eliminating the need for disconnecting bri~di=e voltage cc set zerr).
Although de?-:gned for nu?l detector applications, the Model 151 is
also useful as a dc voltmeter with 3 maximum full-scale sensi~isi~y ?f
100 microvolt3 and as an ,ammeter with a maxlm::m full-s,x1e ren:ii~tivL::.
of 10 micro-microamperes.
The 151 has i full-scale ouL.out of 10 volts at up to one mlliiamperc.
Thiv is sufficient Lo drive one milliar5~ere reco!.ders 'ii .well as ~iervo-
rebalance recorder3 and oscilloscopes.
I
I-l
0763
MODEL 151 ~fICROVOLTMETER
RANGE:
Linear: 0.1 millivolt full scale to 10 volts on zer*-center meter. ILL overLappin,:
ranges in lx and 3x steps.
Non Linear: Five ranges of 0.001, 0.01, 0.1, 1.0 and 10 volts full scal.c, eaci1 covering
3 decades.
ACCURACY:
Linear ranges: +3% of full scale exclusive OE noise and drift.
Non-linear ranges: ?lO% of input exclusive of noise and drift
ZERO DRIFT: Less than 10 microvolts per day after 30-minute warm-up.
INPUT NOISE (with input shorted): Less than 2% of fui.1 scale on ~11 r;,,r::cs
INPUT RESISTANCE: 10 megohms on all ranges.
LINK FREQUENCYREJECTION: 2,OOO:l
COMMON MODE REJECTION: With l-megohm source resistance. dc:5,000,000:1. l.i~,le rriqut,ncv:
500,000:1.
ISOLATION: Circuit ground to chassis ground: Approximately 109 ohins ijllillted 5'; ll.i!L
microfarad. Circuit ground may be floated up to ?500 volts dc or ~p~!ak:
◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo