Keithley Instruments 197A Data Sheet

197A 5

1

⁄2-Digit Portable Multimeter

• 1µV, 1mΩ, 1nA sensitivity

• TRMS AC measurements to

100kHz

• 100-point data logger, relative

reference, dB

• Backlit display

ACCESSORIES AVAILABLE

1681 Clip-On Test Lead Set
1754 Safety Univ. Test Lead Kit
5806 Kelvin Clip Leads
1978 Rechargeable Battery Pack

• Battery option

DC VOLTS

Ordering Information

Measures voltage, current, and resistance economically

197A Autoranging Microvolt

DMM

197A/1978

Autoranging Microvolt
DMM with Recharge­able Battery Pack

RANGE LUTION RESISTANCE 18°–28°C

200 mV 1 µV >1 GΩ 0.016 + 3

200 V 1 mV 10 MΩ 0.015 + 2

1000 V 10 mV 10 MΩ 0.015 + 2

RESO- INPUT 1 Year,

2 V 10 µV >1 GΩ 0.011 + 2

20 V 100 µV 11MΩ 0.015 + 3

The Model 197A is a lightweight, portable DMM with a battery pack
option. It combines 5

1

⁄2-digit resolution (on a 220,000-count display)

with 1µV, 1nA, 1mΩ sensitivity. Basic DCV accuracy is 0.011%.

Extended Performance

Measure voltage over nine decades from 1µV to 1000V. Input resistance
on the two lowest voltage ranges exceeds 1GΩ. TRMS AC measure­ments can be made to 100kHz. Make 2- or 4-terminal ohms measure­ments over 11 decades from 1mΩ to 220MΩ. Six current ranges meas­ure from 1nA to 10A.

Battery Option

The Model 1978 battery pack option enables data to be collected in
locations where AC power is not available or where isolation from line
voltage is required for safety.

GENERAL

DISPLAY: Backlit ±220,000-count LCD, 0.45 in height; polari-

ty, function, range, and status indication.

RELATIVE: Pushbutton allows zeroing of on range readings.

Allows readings to be made with respect to baseline value.
Front panel annunciator indicates REL mode.

DATA LOGGER and MIN/MAX: 100 reading storage capacity; records

data at one of six selectable rates from 3 readings/second to 1 read­ing/hour or by manual triggering. Also detects and stores maximum
and minimum readings continuously while in data logger mode.

CONVERSION RATE: 3 readings/second.
OVERRANGE INDICATION: “OL” displayed.

ACCURACY

±(%rdg + counts)

ENVIRONMENT: Operating: 0°–50°C; <80% relative

humidity up to 35°C; linearly derate 3% RH/°C, 35°–50°C.

Storage: –40° to +70°C.
WARM–UP: 1 hour to rated accuracy.
POWER: 105–125V or 210–250V (external switch selected),

90–110V available; 50–60Hz, 12VA. Removable power cord.

Optional 5 hour battery pack, Model 1978.
DIMENSIONS, WEIGHT: 89mm high × 235mm wide ×

275mm deep (3

(3 lb, 14 oz).

1

⁄2 in × 91⁄4 in × 103⁄4 in). Net weight 1.8kg

Extended warranty, service, and
calibration contracts are available

Accessories Supplied

Instruction Manual and Model
1751 Safety Test Leads

1.888.KEITHLEY (U.S. only)

SWITCHING SYSTEMS

DMMS, DATA ACQUISITION/

www.keithley.com

TRMS AC VOLTS

.

2V–200 V 1.00 + 100 0.35 + 100 0.6 + 200 1.5 + 250 3 + 400

OHMS

ACCURACY (1 Year)

RANGE 20Hz–50Hz 50Hz–10kHz 10kHz–20kHz 20kHz–50kHz 50kHz–100kHz

200 mV 1.00 + 100 0.35 + 100 0.6 + 200 1.5 + 250 5 + 400

750 V 1.25 + 100 0.75 + 100 1.0 + 200 1.8 + 250 3 + 400

RANGE RESOLUTION I–SHORT UNKNOWN 22°–24°C 18°–28°C

200 Ω 1mΩ 2 mA 0.5 V 0.01 + 2 0.018 + 3

2kΩ 10 mΩ 2 mA 4.0 V 0.01 + 2 0.018 + 2

20 kΩ 100 mΩ 400 µA 4.0 V 0.014 + 2 0.026 + 2

200 kΩ 1 Ω 40 µA 4.0 V 0.014 + 2 0.026 + 2

2MΩ 10 Ω 4 µA 4.0 V 0.02 + 2 0.035 + 2

20 MΩ 100 Ω 400 nA 4.0 V 0.10 + 2 0.12 + 2

200 MΩ 10 kΩ 400 nA 5.0 V 2.00 + 1 2.00 + 1

A GREATER MEASURE OF CONFIDENCE

NOMINAL ACROSS 24 Hr., 1 Year,

18°–28°C ±(%rdg + counts)

OUTPUT ACCURACY

MAX. V ±(%rdg+counts)