Keithley 178 Bedienungsanleitung

INSTRUCTION MANUAL

Digital Multimeter

Model 178

SPECIFICATIONS

DC VOLTAGE

RANGE MAXIMUM

READING

ACCURACY (12 months)

18°-28°C

±(%

rdg + digits) MAXIMUM

ALLOWABLE INPUT

1.9999

2OV

19.999

200 v

199.99

1200v 1200.0

Temperature Coefficient

(0°-18°

and

28°-55°C):

+(0.006%

+ 0.2

digit)/°C

Input

Resistance: 10

±0.

Settling Time: 1

second to within 1 digit of

final reading.

0.04% +

1d 1200V momentary

0.04% +1Id 1200v

Normal Mode Rejection Ratio:

Greater than 60dB at

50Hz

and

60Hz.

Common Mode Rejection Ratio

(lkfi

unbalance):

Greater than 120dB at DC,

50Hz

and

60Hz.

AC VOLTAGE

RANGE

20 v

200 v

1000 v

MAXIMUM

READING

1.9999

19.999

199.99

1000.0

ACCURACY (12 months) TEMPERATURE COEFFICIENT

(above 2000 counts)

0°-I

8°

and

28°-55°C

18°-28°C;

00Hz-1

Ok Hz

±(%

rdg + digits)/°C

±(%

rdg + digits)

45Hz-10kHz I0kHz-20kHz

0.4% +

15d 0.04% +

0.5d

0.09% +

0.5d

0.3% + 15d 0.01% +

0.5d

0.03% +

0.5d

0.3% + 15d 0.01% +

0.5d

0.03% +

0.5d

0.3% + 15d 0.01% +

0.5d

0.03% +

0.5d

Extended Frequency Accuracy: Input Impedance:

(45Hz-100Hz)

±(0.5%

+ 15 digits)

IMfi

+ 1% shunted by less than 75pF.

(10kHz-20kHz)

±(1.0%

+ 15 digits)

Maximum Allowable

Input Voltage:

Response:

Average responding calibrated in rms

1000V

rms, 1400V peak,

V·Hz

maximum.

of a sinewave.

Common Mode Rejection Ratio

(lkfi

unbalance):

Settling Time:

2.5 seconds to within 10 digits 60dB at DC,

50Hz

and

60Hz.

of final reading.

RESISTANCE

ACCURACY (12 months) TEMPERATURE COEFFICIENT

MAXIMUM

18°-28°C

0°-1

8°

and

28°-55°C

NOMINAL

RANGE READING

±(%

rdg + digits)

±(%

rdg + digits)/°C APPLIED CURRENT

2kQ

1.9999

0.04% +

2d 0.003% +

0.2d

1mA

19.999 0.04%

Id0.003% +

0.2d

200

100~

199.99 0.04%+Id0.003% +

0.2d 10~

2000

1999.9 0.04%+Id0.003% +

0.2d

1P A

20Ma

19.999 0.10%+

1 d

0.02 % +

0.2d 0.1~

Maximum Allowable Input:

250V rms sine, 350Vpeak.

Maximum Voltage

Across Unknown: 2V

within range,

5V open circuit.

GENERAL

DISPLAY:

Five 0.5” LED digits, appropriate

decimal position and polarity indication.

CONVERSION PERIOD: 400

milliseconds.

ENVIRONMENT:

Operating:

0°C

55°C;

0% to 80% relative humidity up to

40°C.

Storage:

-25°C

+65°C.

Settling Time:

1 second to within 1 digit of final

reading except 2 seconds on the

20Mfi

range.

POWER:

105-125 or 210-250 volts (switch selec-

ted), 90-I

10V

available.

50-60Hz,

7 watts.

Optional 6 hour battery pack, Model 1788.

DIMENSIONS, WEIGHT:

85mm high x 235mm

wide x 275mm deep

(3-1/2

in. x

9-1/4

in. x

10-3/4

in.). Net weight:

1.7kg

(3lbs.,

13 oz).

OVERRANGE INDICATION:

Display blinks

all

zeros above 19999 counts.

MAXIMUM COMMON MODE VOLTAGE:

1400V

peak.

INSTRUCTION MANUAL

OPERATING INSTRUCTIONS

Digital Multimeter

Model 178

2-77

OPERATING INSTRUCTIONS. Refer to Figure 2-3 and operate the DMM as follows:

Turn on the power by depressing the ON/OFF pushbutton.

Select the function with the DCV, ACV or

pushbutton.

Select the range by depressing the appropriate pushbutton. For ac and dc voltage

measurements there are four ranges available. For resistance measurements there are

five ranges. The pushbuttons are interlocked to avoid improper settings.

Connect the source to the INPUT terminals.

POLARlTY

(NEGATIVE IS INDICATED, POSITIVE IS IMPLIED WHEN MINUS

(-)

DISPLAY IS OFF)

DCV ACV

ELECT FUNCTION SELECT RANGE CONNECT-SOURCE

*ADJUST

ZERO AS REQUIRED FOR MEASUREMENT OF DC VOLTAGE AND RESISTANCE. SEE SEC. 2-11.

FIGURE

2-3.

Operating Controls.

CAUTION

MAXIMUM RATINGS:

DCV:

(2V):

45OV

rms continuous; 12OOV peak, for

seconds per minute.

(20-1200V):

12OOV peak.

ACV: (All Ranges): 1OOOV rms; 10

V·Hz.

(All Ranges): 25OV rms sine wave or 35OV peak.

2-8

VOLTAGE MEASUREMENT. Use the Model

178

DMM

measure dc volts as follows:

Turn on power and depress the DCV pushbutton.

Select the desired range from the four ranqes available. The maximum reading

19999.

Over

range is indicated by a flashing 0000 except on the

1OOO-volt

range.

CAUTION

Do not exceed the maximum ratings.

Instrument damage may occur.

Neqative polarity is displayed automatically. Positive polarity is implied

when

the minus

(-)

display

is off.

Zero the

instrument as described

in Paragraph 2-11 before the first use, whenever

the’instrument

is used outside the temperature range of

18"

to 28°C, and approximately

weekly

,during

normal

use.

2-9

AC VOLTAGE MEASUREMENT. Use the Model

178

DMM to measure ac volts as follows:

Turn on power and depress the

ACV

pushbutton.

CAUTION

Do not exceed the maximum ratings. Instrument damage may occur.

19999

Select the desired range from the four ranges available. The maximum reading is

Overrange is indicated by a flashing 0000 except on the

lOOO-volt

range. The

instrument reads the root mean square value of a sine wave with a frequency of 45 to 20

kHz.

The Model

1682

RF Probe (see Paragraph

2-12e)

should be used to measure ac voltages

with a frequency of 20kHz to 100MHz.

2-10.

RESISTANCE (R) MEASUREMENT. Use the

178

DMM to measure resistance as follows:

Turn on power and depressthe

pushbutton.

CAUTION

Do not exceed the maximum ratings.

instrument damage may occur.

19999

Select the desired range- from the five ranges available. The maximum reading is

Overrange is

M refers to meqohms. indicated by a flashing 0000. The letter k refers to

kilohms, and

The HI inputterminal is positive and causes forward conduction of semiconductor

junctions.

Two volts is applied at full range with

volts maximum under open circuit conditions.

Zero the instrument

described

in Paragraph 2-11 before the first use whenever

theainstrument

is used outside the temperature range of

18°

28°C,

and approximately

weekly during normal use.

2-11.

ZERO ADJUSTMENT. The zero adjustment nulls input offset on the 20, 200 and 1200

volt ranges and on all resistance ranges. Typically, this adjustment need

not be per-

formed more often than once a week unless the instrument is operated at ambient

temperatures outside the range of

18°

28°C.

Zero adjustment may also be used for lead

compensation on the

function.Zero the instrument as follows:

Turn on

the power

and select DCV

and

the 20

range.

b. Plug

in test leads and short them.Adjust the zero adjust (pot

R132)

from the

front panel with a small screwdriver to obtain a reading of 0000 or

-0000.

2-12. ACCESSORIES. A

wide range of accessoriesis available to facilitate use of the

Model

178

DMM,

extend its range and adapt it for additional uses.

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