Tektronix 410A Instruction Manual

KEI’i?HLEY INSTRUME.&TS,

warranty

We warrant each of our products to be free from defects in material
atid workmanship. ,Our obligation under this warranty iS’to repair
or replace any instrument or part thereof which, within a year after
shipment, proves defective upon examination. We will pay local
domestic surface freight costs.

To exercise this warranty, write or call your local Keithley ~repre­sentative, or contact Keithley headquarters in Cleveland, Ohto.

.

You will be given. prompt assistance and shipping instructions.

repairs and; calibrat,ion

Keithley lnstrbments~ maintains a compl&e repair~,and.calibration
service as well as a standards laboratory in Cleveland, Ohio. A,
service facility is also located in Los Angeles for c&r west coast
customers.

A Keithley service facility at our Munich, Germany office is

available for our customers throughout Europe. Service in the

United Kingdom can be handled at our office i,n Reading. Addition­ally, Keithley representatives in most countries maintain service

and calibration facilities..

To insure prompt repair or recalibration service, ,please contact

your local field representative or Keithley headquarters directly

before returning the instrument. Estimates for repairs, normal

recalibrations and calibrations traceable to the National Bureau of

Standards are available upon request.

KEI’I’HHLEY INSTRUMENTS

20776 AURORA ROAD * CLEVELAND, OHIO 44130

TELEPHONES (216.) 248-0400 . TELEX OS-6468

E”roC.*n”dw*: 14 A”*. “ill.rd~n . CH-the Pull”. 6”iS.. . ,021, 261168

Unlt~dKln#dom~ ~~oulton RowI *

W.,, 6.man”: Hei6lho‘.lr.*.. 3a . D-6000 Munch.” 70 . ,081,l 74632,

F,*nc*:

44 Rue *n*101. r=r.nc. .

Reading e Berkahfre a (07341 861287

61120 PaIa,s..u . (01, 626-0046161

INSTRUCTION MANUAL

MODEL 4lOA

Picoammeter

@COPYRIGHT 1976, KEITHLEY INSTRUMENTS, INC.

PRINTED APRIL 1976, CLEVELAND, OHIO, U.S.A.

CONTENTS MODEL 410A

CONTENTS

SeCtiO”

SPEClFIC*TIONS------------------------------------------------------------- iv

1, GENERAL DESCRIPTION---------------------------------------------------- 1

2, OPERATION-------------------------------------------------------------- 4

3, CIRCUIT DESCRIPTION---------------------------------------------------- 6

Page

4, SER"ICING-------------------------------------------------------------- ,

5. CAL~BRATION------------------------------------------------------------ 9

,j. *CCESSOBIES------------------------------------------------------------ 15

7. REPLACEABLE PARTS------------------------------------------------------ 18

SCHEMATIC------------------------------------------------------------------ 24

0275

ILLUSTRATIONS

FIG. NO.

1 Front pane1 Controls, ___--____-__________-------------------------­2 Rear Panel Conrrols, ____-____-____-_________________________------­3 Divider circuits *cross Picoamerer outpur. -----------------------­4 Simplified Diagram for Ameter Circuit. ---------------------------­5 Test Set-up for Model 410A Rise Time Checks an all ranges. --------­6 Chassis, Top View. ________________________________________--------­7 componenr Layour, p+1p,4, ____--___--_____________________________-­8 Top cover *ssem~ly. __-_______--____________________________--------

9 Bottom cover Assembly. -----_--------_------------------------------

TITLE

PAGE

3
3
5

6
11
13
14
23
23

SPECIFICATIONS

SPECIFICATIONS

RANGE: 3 x 10’13 ampere full scale to 10.3 ampere in

twenty Ix and 3x ranges. positive or negative currents.

ACCURACY: 12% of full scale on 10’” to XV ampere

ranges: *4%off”li scaleon 3 x 10+to3 x 10’~~ampere
ranges.

ZERO DRIFT: Less than

0.02% per “C on ice to l0.y ampere ranges; less than

1.5% per week plus 0.06% per “C on 3 x 1Q.13 ampere
range after a

l&minute

greater than 1 “OIL

OFFSET CURRENT: Less than lo-” ampere.
INPUT VOLTAGE DROP: Less than 1 millivolt for full.

scale meter deflection on any range when properly
zeroed.

EFFECTIVE fNPUT RESISTANCE: Less than 1 ohm on

lo’” ampere range,

on 3 x lo“3 ampere range.

RISETIME, MAXIMUM: Seconds, from 10% to 90%.

Range,

ampere

IO-”
IL? 1 I 1.0 2

IO-‘0 0.25 cl.4
IO- 3 0.1 0.1

1Q.a 0.1 0.1
10-T and above

MAXlMUM INPUTOVERLOAD:

Transiant:1QQQvoltsforupto3secondsusinga Keithley
(or other 10 mA limited) High Voltage Supply.
Continuous:6QQvoltson3 Y 10’llto Wampere ranges.
decreasing to 12 volts on the 1Q’2 ampere range.

RECORDEROUTPUT:

Output: *I volt or 1 milliampere for fullxale meter
deflection. Output polarity i* opposite input polarity.
Noise: Less than 1% of full scale peak.to-peak on 10’”
to 10’” ampere ranges. increasing to 5To peak-ta-

peak on 3 x llT~‘ampere range.

CONNECTORS: Input: Teflon.insulatod UHF type.

Output: Amphenol 8QPCZF.

POWER: 105.125

Hz, 5 watts.

DIMENSIONS, WEIGHT: 5%” high x 8%” wide x 10” deep;

net weight. 10 pounds.

ACCESSORIES SUPPLIED: Mating-input and output

Con”ector*.

0.5%

of full scale per week plus

warm-up with source voltage*

increasing to less than 3 x 109 ohms

With Yp to 100 pF

AC.0.I lnpYt

2.5

less tnan 0.001

or

210.250 volts (switch

Wl,h YP to 5000 pf

A6rOSL l”PY,

12

kS5 than 0.001

selected). 50.60

MODEL 410A

iv

1274

CN410A-4

Sheet I of I

0776

KEITHLEY INSTRUMENTS.

INSTRUCTION MANUAL

CHANGE NOTICE

MODEL 4lOA PICOAMMETER

INTRODUCTION: Since Keithley Instruments is continually improving pro-

duct performance and reliability, it is often necessary to make changes
to Instruction Manuals to reflect these improvements. Also, errors in

Instruction Manuals occasionally occur that require changes. Sometimes,
due to printing lead time and shipping requirements, we can’t get these
changes immediately into printed Manuals.

formation is supplied as a supplement to this Manual in order to provide
the user with the latest improvements and corrections in the shortest

possible time. Many users will transfer this change information directly

to a Manual to minimize user error. All changes or additions are indi-

cated in

CHANGES :
PAGE I9

Q103

Q104
+‘:;Replace QIOI, QIOZ or RI16 by ordering Plug-in board 23733.

italics.

PNP, Case R-110
PNP, Case R-110

F-I
F-I

The following new change in-

Sl7638 1”G-33
527638 T&33

I No C

7
7

SECTION 1.

GENERAL DESCRIPTION

l-1. GENERAL.

a. The Keithley Model 410A is a sensitive, complete-

ly solid-state picoammeter which measures currents over

20 ranges from 10-3 to 3 x 10-13 ampere full scale.

accuracy is b% of full scale on the lo-3 to 10-B am-

pere ranges and 14% of full scale on ctle 3 x 109 co
3 x 10-13 ampere ranges.

b. The Pic"ammeeer employs matched MOs FET transis-

tars in the input followed by a differenrial amplifier
stage, a transistor driver and a transistor O"epUC
stage. Negative feedback is used for stability and
aCC"rXy.

1-2. FEATURES.

a. A unique circuit provides complete overload pro-

tection for Model 410.~ without compromising the out­standing

features of the MOS FET input. The Picoam­meter will withstand transient overloads up CO 1000
volts wirhout damage, and overload recovery is almost

instantaneous.

b. The time and temperature stability of the Model

410A Picoamneter is excellent. The Model 410.4 will
operate for

days without requiring rezeroing. Zera

drift with time is less than 0.5% of full scale per
week. Temperature drift is equally small - a change
of 10°C affects the reading less than 0.2% of full

scale on ehe 10‘3

to 10-12 ampere ranges.

c. Fast warm-up is an inherent characterisric of

the Picoammeter. It can be used almost immediately
on its most SensiCive range. For maximum seability,
however, about 10 minutes warm-up should be allowed.

d.

One

volt

or 1 milliampere at

full scale deflec­fFon on all ranges is provided to drive chart record­ers. The 1 milliampere recorder output will drive
the Keithley 370 Recorder directly. When potentio­metric recorders are used, the output voltage ca" be
conveniently divided by a shunt resistor and adjusted
for full scale with the rear

panel Calibration

paten-

tiometer.

0172

1

GENERAL DESCRIPTION

MODEL 410A

TABLE 2. Model 410A Front Panel Conrrols (Figure 1).

Control
AMPERES Switch
METER Switch.

ZERO ADJ. Control

Pilot Light
ZERO CHECK Sutton

selects full-scale Current range instrument is to measure. 2-2

Turns inserument on; selects meter polarity.

ZemeS meter on any range. 2-2
Glows to indicate instrument is on.
Checks zero on any range.

CO”tlWl

INPlsI Receptacle connects input to source.

Olsi"PuT Receptacle

co""ectar.

connects output to monitoring device.

Funceional Description

Functional Description

1 MA - 1 ” Switch Selects output of instrument:

receptacle is a Teflon-insulated UHF

1 milliampere or 1 volt.

Par.

Z-2,2-4

___
_--

Par.

I

2-1,2-z

2-4
2-4

1 MA CAL Control

117-234 " Switch

Fuse

2

Adjusts output

sets instrument for 117 or 234 Volt ac power line. z-2,2-5

from 0.95 eo 1.05 mA.

3Acz Slow-Blow. 117 volt - ,125 A; 234 volt - ,062 A.

2-4

2-5

0172

MODEL 410A

GENERAL OESCRIPTTION

0172

FIGURE 2.

sear Panel Controls.

3