Keithley 1920 User manual

INSTKUCTIW MANUAL

IlUUEL 1YZU

TKWS UPTIUII

First Printing, July, 1981, Cleveland, Ohio, U.S.A.

Document No. 32000, Kev. A

Table of Contents

Section

ClENEKAL INFORMATION .............................

l-l. Introduction. .............................

l-3. Warranty Information. .........................

1-5. Manual Addendums. ...........................

l-7. Safety Symbols and Terms. .......................

l-9. Specifications. ............................

OPERATING INSTRUCTIONS. ...........................

2-l.

Operation in Model 191. ........................

2-4. Operation in Model 192. ........................

MAINTENANCE .................................

3-2. Installation in Model 191 .......................

3-3. Installation in Model 192 .......................

3-4. Performance Verification. .......................

3-6. Kecommended Test Equipment. ......................

3-7. Environmental Conditions. .......................

3-9. Performance Verification Procedure. ..................

3-11.

Initial Conditions. ..........................

3-13. Calibration ..............................

3-15. Kecommended Test Equipment. ......................

3-17. Environmental Conditions. .......................

X-19.

Calibration Procedure .........................

3-22. Troubleshooting ............................

3-24. Troubleshootiny Procedure .......................

TtiEURY OF UPEKATIUN .............................

REPLACEABLE PAKTS ..............................

5-l.

General ................................

5-3. Ordering Information. .........................

5-5. Factory Service ............................

5-7. Schematic and Component Layout. ....................

Page

l-l

2-1

2-l

2-1

3-l

3-2

3-3

3-4

3-6

3-G

3-6

3-9

4-l

5-l

5-i

5-l

Model 1920 General Information

SECTION 1. GENERAL INFORMATION

l-l. INTRODUCTION

l-2.

The Keithley Model

1920

is a True Root Mean Square (TKMS) AC plug-in option for the

Models

192

and

191.

The 1920 enables the 191 or 192 to measure the TKMS value of an AC

siynal. When the 1920 is installed in the Model

192

an ACtUC function is available. The

Model

1920

has four ranges on which an AC siynal can be measured.

is field

installable.

1-3. Warranty Information

l-4. The warranty is yiven on the inside front cover of this manual. If there is a need

to exercise the Warranty, contact the Keithley Representative in your area to determine

the proper action to be taken. Keithley maintains complete repair and calibration

facilities in the United States, West tiermany, tireat Britain, France, the Netherlands,

Switzerland and Austria. Information concerning the application, operation or service of

your instrument may be directed to the applications engineer at any of the above

locations. Check the inside front cover of this manual for addresses.

l-5. Manual Addendums

1-G.

Improvements or changes to the instrument that occur after printing of the [manual

will be explained on an addendum which will be attached to the inside back cover.

1-7. Safety Symbols and Terms

l-8. The symbol A on the instrument denotes that the user should refer to the operating

instructions.

The symbol on the instrument denotes that up to 5UllV may be present on the terminals.

The WARNING used in this manual explains dangers that could result in personal injury

or death.

The CAUTION used in this manual explains hazards that could damage the instrument.

l-9.

Specifications

l-10. Uetailed specifications for the Model 1920 are given in Table

l-l.

l-l

General Information Model 1920

TABLE 1-l

1920 Specifications

5-l/2 Digit Accuracy, +(% Rdg + Counts),

yr 18-28'C

5-l/2 Digit 20-50Hz" DC, 50Hz-lOkHz* lOK-20kHz" 20kHz-lOOkHz**

Range RESOLUTION

2v 1OPV 1% t

100

0.25% t 100 0.35% + 300

1% t 500

2ov lOOld

1% t 100

0.25% t 100 0.35% + 300

1% t 500

2oov 1mV 1% t

100

0.25% + 100 0.35% + 300 1% t 500

7oov 1OmV

1% t 100

0.354: t 100 0.5% + 300

1% t 500

RESPONSE:

CREST FACTOR

AC + DC MODE:

riAxIriuri INPUT:

SETTLING TIME:

INPUT IMPEDANCE:

TEMP. COEFFICIENT:

3dB BANTMIDTH:

CFIRR:

TRUE RFlS

Add 60 counts to specified accuracy (not wailable in We1

191)

1OOOV Peak AC + DC, 2 x lo7 V* Hz

0.5 set to within 0.1% of change in reading

211 ohm shunted by less than 5OpF.

(O"-18OC and 28"-5O'C): Less than

0.1

x applicable accuracy

specification per "C below 50kHz; 0.2 x for 50kHz to 1OOkHz

500kHz Typical

Greater than 60dB at 50 and 60Hz

(lk

ohm unbalanced)

* Above 2000 counts

** Above 20000 counts; 3% + 500 typical below 20000

l-2

Model 1920

SECTION 2. OPERATING INSTRUCTIONS

Operating Instructions

Z-l. Operating Instructions for the rlcdel 1920 installed in the ilodel 191 are as

follows:

2-2. Ilith the ilodel 1920 option, the ilcdel 191 reads AC voltages froln 10 r;licrovolts/digit

to 1000v. The instrument displays the True Koot llean Square (TKilS) value of an AC

voltage. It has a frequency response of 20Hz to 100ktlz.

2-3. The rnaximm reading is 199YYY. Werrange is irdicatcd by (-) l-----, except on

the 1000 volt range. The 700 volt range is selected idith the 1000 volt button. On the

700 volt range, the display can read beyond the rnaxiinuln allobiable input voltage. ilaximun

allobcable input: 1OOOV Peak AC + DC; 2 x lo7 V'Hz. Use the ilodel 191 to lneasure AC

voltage as follobis:

CAUTION

Do not exceed maximum allohcable input voltage. Instrument damage may

occur.

A. Turn the pokier on IJith the UN/OFF pushbutton, ati depress the ACV pushbutton.

8. Select the desired range from the 4 ranges available. The decimal point is positioned

by the range pushbutton.

C. Ensure that the I0JLL pushbutton is out (light off) unless measurements are to be made

as deviations from a preset value.

NOTE

Do not use NULL to zero the range. A small residual zero readirq is

normal. If NULL is used to zero this offset, readings in specified

accuracy range will be low by the offset amount. This is because rms

measurement signals add in a root mean square fashion arrl not

linearly. The NULL function is a linear offset axl not usable in TKllS

measurements.

0. Connect the signal to be measured between the INPUT HI ati LO binjiny posts. The

birding posts accept wires, spade lugs or banana plugs for ease of connectiq the

circuit to be measured. Observe the displayed digits ard decimal point.

2-1

Operating Instructions Model 1920

E. For specified accuracy (pulse widths ,lOns, peak voltage (1.5 x full scale) Figure 2-1

shows the allowable input signal vs. crest factor. The figure illustrates that for a

crest factor of three the displayed reading must be less than 100,000 counts (1V on

the 2V range). So long as the maximum input is not exceeded no damage will result in

crest factors exceeding that shown in Figure2-I, but accuracy will slowly degrade (For

CF >3 but<10 typical accuracy is degraded by (CF-3) x 0.36% arti peak signal must be

less than 5 x full scale for that range).

I I

100000

200000

Displayed Counts

Figure 2-l. Crest Factor VS. Displayed Counts

2-4. Operating Instructions for the Model lY20 installed in the Model 192 are as

follows:

2-5.

With the Model 1920 option, the Model

192

reads AC voltages from 1 microvolt/digit

to 1ooov.

The instrument displays the True Koot Mean Square (TKMS) value of an AC voltage

signal.

2-G.

The maximum reading is 199999. Overrange is indicated by OFLO. Maximum allowable

input is 1OOOV Peak AC f DC; 2 x 107V.Hz. Use the Model

192

to measure AC or AC + DC

voltages as follows:

CAUTION

Do not exceed maximum allowable input voltage. Instrument darnage may

occur.

A. TURN POWER UN with UN/OFF pushbutton.

B. Press the ACV button once to select the ACV (TKMS) function. Press the ACV button

ayain and the 192 will measure the T'KMS value of an AC + UC signal (AC signal

superimposed with a DC level). The ACV and DCV LEDs will light simultaneously when

the AC + UC function is enabled. Pressing the ACV button again will return the 192 to

the ACV function. Pressiny the DC button while in AC t DC returns the

192

the DCV

function.

2-2

UPEKATINti INSTKUCTIUNS

NOTE

IWDEL 1YZU

The 14odel 192 will display "NO AC" if ACV is selected without the 1920

or 1910 ACV option. The AC + UC function is available only with C-4

and dbove software and Kev U and above Analoy Board.

C. SELECT KANtiE from the four ranyes available. The decimal point is positioned by the

ranye pushbutton. The 1UOUV ranye is selected with the 2000 button. If the ZUIQ

button is inadvertently pressed when in ACV function, the 192 will set the ranye to

1uuo.

Il. ZEKU OFF unless [measurements are to be made as deviations frown a preset value.

NOTE

Uo not use ZEKU to zero the ranye. A small residual zero readiny is

normal. If LEKU is used, the residual voltaye readiny in specified

accuracy ranye will be low by the amplitude of the zeroed residual

voltaye. This is because rms measurement signals add in a root mean

square fashion and NUT linearly. THe LEKU function is a linear offset

and not usable in TKMS measurelnents.

E. CONNECT IllPUT to be measured between the HI HCV and LO bindiny posts.

F. TAKE KEAUING.

ti. For specified accuracy (pulse widths LlUus, peak voltage (1.5 x full scale) Figure Z-l

shows the allowable input siynal vs. crest factor. The figure illustrates that for d

crest factor of three the displayed readiny (must be less than lUU,UUU counts (1V on

the ZV ranye). So long as the maximum input is not exceeded no damage will result in

crest factors exceediny that shown in Fiyure 2-1, but accuracy will slowly degrade

(For CF >3 but 510 typical accuracy is degraded by (CF-3) x U.3GX and peak signal must

be less than 5 x full scale for that range).

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