DIGITAL MULTIMETERS
175A 41⁄
• Battery option
• IEEE-488 interface option
• 100-point data logger
• Digital calibration
• TRMS AC measurement
• Backlit display
2
-Digit Multimeter
ACCESSORIES AVAILABLE
TEST LEADS
1681 Clip-On Test Lead Set
1751 Safety Test Leads
1754 Safety Universal Test Lead Kit
CABLES
7007-1 Shielded IEEE-488 Cable, 1m (3.3 ft)
7007-2 Shielded IEEE-488 Cable, 2m (6.6 ft)
7008-3 IEEE-488 Digital Cable, 0.9m (3 ft)
7008-6 IEEE-488 Digital Cable, 1.8m (6 ft)
PROBES/SHUNT
1600A High Voltage Probe
1651 50A Current Shunt
1682A RF Probe
1685 Clamp-On Current Probe
OUTPUTS
1753A IEEE-488 Interface
POWER
1758 Rechargeable Battery Pack
RACK MOUNT KITS
1010 Single Fixed Rack Mount Kit
1017 Dual Fixed Rack Mount Kit
See page 235 for descriptions of all accessories.
The Keithley Model 175A is a 41⁄2-digit LCD bench/portable DMM with 0.03% basic DCV accuracy.
It offers extended measurement capabilities including a 10A current range, 100kHz bandwidth, and
resistance measurements from 10mΩ to 200MΩ. Annunciators provide function, range, and feature
indication.
With the Model 175A, choose either manual or autoranging. Fast autoranging is available on DC volts, ohms, AC
volts, and dB.
Data Logging
The Model 175A’s 100-point data logger is capable of storing data at six selectable rates from three readings per second to one every hour. Data can be recalled from the front
panel. This feature enables collection of response curve
data and monitoring of drifts or rates of change without
the need for a printer.
The Min/Max hold feature holds both lowest and highest
ORDERING INFORMATION
All include Instruction Manual and Model
1751 Safety Test Leads.
175A Autoranging DMM
175A/1753A Autoranging DMM with
IEEE-488 Interface
175A/1758 Autoranging DMM with
Rechargeable Battery Pack
175A/53A/58 Autoranging DMM with
IEEE-488 Interface and
Rechargeable Battery Pack
This product is available with an Extended
Warranty. See page 635 for complete ordering information.
readings over a selected period of time.
Relative Measurements
The dB function makes the Model 175A suitable for audio and communications applications.
Direct dB readings are given throughout a dynamic range from –98 to +62dB, with 0.01dB resolution above 10mV. The 100kHz bandwidth covers well past the audio range. The optional RF probe
extends the bandwidth to 250MHz.
QUESTIONS?
1-800-552-1115 (U.S. only)
Call toll free for technical assistance,
product support or ordering information, or
visit our website at www.keithley.com.
The relative reference allows nulling out circuit voltage offsets or lead resistances. By nulling out
power supply voltages or circuit outputs, drifts or changes can be displayed. Combined with the dB
function, it can be used to make fast gain-stage measurements.
Digital Calibration
With the Model 175A’s digital calibration, all calibration factors are stored in non-volatile memory,
allowing calibration to be done electronically without manual adjustments. The IEEE-488 interface
option offers range programmability on volts and ohms, TALK/LISTEN capability, trigger, SRQ, and
other commands. Combined with the digital calibration feature, calibration can be performed on
the bus in as little as two minutes.
www.keithley.com
DIGITAL MULTIMETERS
175A 41⁄2-Digit Multimeter
DC VOLTS
RANGE RESOLUTION RESISTANCE ±(%rdg + counts)
200 mV 10 µV >1 GΩ* 0.03 + 2
2 V 100 µV >1 GΩ* 0.03 + 1
20 V 1 mV 11 MΩ 0.03 + 1
200 V 10 mV 10 MΩ 0.03 + 1
1000 V 100 mV 10 MΩ 0.03 + 1
*With all function buttons in the out position.
NORMAL MODE REJECTION RATIO: >60dB at 50Hz, 60Hz ±0.15%.
MAXIMUM ALLOWABLE INPUT: 1000V DC or peak AC (<10s per minute on 200mV
and 2V ranges; 300V rms continuous).
SETTLING TIME: 1s to within 1 count of final reading on range.
dB MODE (ref: 600Ω): Accuracy: ±(0.02dB + 1 count) (above 78dBm).
Resolution: 0.01dB above 5% of range.
INPUT 18°28°C
ACCURACY (1 Year)
OHMS
RANGE RESOLUTION ±(%rdg + counts) ON RANGE
200 Ω 10 mΩ 0.05 + 2* 0.2 V
2kΩ 100 mΩ 0.05 + 1 2.0 V
20 kΩ 1 Ω 0.05 + 2 0.2 V
200 kΩ 10 Ω 0.05 + 1 2.0 V
2MΩ ** 100 Ω 0.05 + 2 0.2 V
20 MΩ ** 1 kΩ 0.2 + 1 2.0 V
200 MΩ ** 100 kΩ 2.0 + 1 2.0 V
*When properly zeroed.
**Appropriate range selected automatically.
MAXIMUM ALLOWABLE INPUT: 450V DC or peak AC.
OPEN-CIRCUIT VOLTAGE: +5V.
DIODE TEST: Display reads junction voltage up to 2V. Test current: 0.7mA nominal.
SETTLING TIME: 2 seconds to within 1 count of final reading on range.
TRMS AC VOLTS ACCURACY (1 Year)*
RANGE 20Hz–50Hz 50Hz–10kHz 10kHz–20kHz 20kHz–50kHz 50kHz–100kHz
2V–750V 1 + 20 0.5 + 20 1 + 40 2.5 + 75 5 + 200
200 mV 1 + 20 0.5 + 20 1.5 + 40 8 + 75 —
dB MODE (ref: 600Ω): ACCURACY (±dBm)
RANGE INPUT 20Hz–10kHz 10kHz–20kHz 20kHz–50kHz 50kHz100kHz
2V–750V 200 mV to 750 V 0.2 0.26 0.56 1.2
200 mV 20 mV to 200 mV 0.2 0.3 1 —
Resolution: 0.01dB above 5% of range.
*Above 1800 counts. **Up to 1kHz.
MAXIMUM ALLOWABLE INPUT: 750V rms, 1000V peak (<10 seconds per minute on 200mV range;
300V rms continuous). 10
3dB BANDWIDTH: 300kHz typical.
INPUT IMPEDANCE: 10MΩ paralleled by <75pF on 20V, 200V, and 1000V ranges. 11MΩ on 200mV
and 2V ranges. Capacitively coupled.
SETTLING TIME: 2 seconds to within 15 counts of final reading on range.
(–12 to +59.8dBm)
(–32 to –12 dBm)
2 mV to 20 mV 2 3 — —
(–52 to –32 dBm)
1 mV to 2 mV 2** — — —
(–58 to –52 dBm)
7
V·Hz maximum.
18°–28°C ±(%rdg + counts)
DC AMPS MAXIMUM ACCURACY (1 Year)
RANGE RESOLUTION BURDEN ±(%rdg + counts)
200 µA 10 nA 0.3 V 0.15 + 2
2 mA 100 nA 0.3 V 0.15 + 2
20 mA 1 µA 0.3 V 0.15 + 2
200 mA 10 µA 0.3 V 0.2 + 2
2000 mA 100 µA 0.8 V 0.2 + 2
10 A 1 mA 0.3 V 0.5 + 2*
*Above 5A derate 0.15% rdg per amp for self-heating.
OVERLOAD PROTECTION: mA Input: 2A fuse (250V), externally accessible.
10A Input: 20A for 15s, unfused.
SETTLING TIME: 1 second to within 1 count of final reading.
VOLTAGE 18°–28°C
TRMS AC AMPS ACCURACY (1 Year)*
RANGE BURDEN 20Hz–50Hz 50Hz–10kHz 10kHz–30kHz
200 µA–20 mA 0.3 V 1 + 20 0.8 + 20 2 + 50
200 mA 0.3 V 1 + 20 0.8 + 20 —
2000 mA 0.8 V 1 + 20 0.8 + 20 —
*Above 1800 counts.
**1kHz max. Above 5A derate 0.15% rdg/amp for self-heating.
SETTLING TIME: 2 seconds to within 15 counts of final reading.
MAX.VOLTAGE 18°–28°C ± (%rdg+counts)
10 A 0.3 V 1.5 + 20** 1 + 20** —
ACCURACY MAX.VOLTAGE
(1 Year) 18°–28°C ACROSS UNKNOWN
IEEE-488 BUS
IMPLEMENTATION
(Model 1753A Option)
MULTILINE COMMANDS: DCL, SDC, GET,
GTL, UNT, UNL, SPE, SPD.
UNILINE COMMANDS: IFC, REN, EOI, SRQ,
ATN .
INTERFACE FUNCTIONS: SH1, AH1, T5,
TE0, L4, LE0, SR1, RL2, PP0, DC1, DT1, C0,
E1.
PROGRAMMABLE PARAMETERS: Range
(DCV, ACV, Ω only), REL, dB, EOI, Trigger,
Calibration, SRQ, Status, Output Format,
Terminator.
GENERAL
DISPLAY:Backlit 41⁄2-digit LCD, 0.5 in height; polarity, function, range,
and status indication. Backlighting is switch-selectable.
RANGING: Auto or manual on DC volts, AC volts, ohms; manual on AC
amps, DC amps.
AUTORANGING TIME: 300ms per range.
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. Also detects and stores maximum and minimum readings
continuously in data logger mode.
CONVERSION RATE: 3 readings per second.
OVERRANGE INDICATION:“OL” displayed.
CREST FACTOR (ratio of peak value to rms value), AC FUNCTIONS: 3.
MAXIMUM COMMON MODE VOLTAGE: 500V peak.
COMMON MODE REJECTION RATIO (1kΩ unbalance): >120dB at
DC, 50Hz, 60Hz ±0.15%. >60dB in AC volts.
TEMPERATURE COEFFICIENT (0°–18°C & 28°–50°C): ±(0.1 × appli-
cable accuracy specification)/°C except ±(0.07%+2)/°C for 50Hz–
10kHz in AC volts.
ENVIRONMENT: Operating: 0° to 50°C; <80% relative humidity up to
35°C; linearly derate 3% RH/°C, 35° to 50°C. Storage: –40° to +70°C.
POWER: 105–125V or 210–250V (external switch selected), 90–110V
available; 50–60Hz, 12VA. Removable power cord. Optional 6-8 hour
battery pack, Model 1758.
DIMENSIONS, WEIGHT: 89mm high × 235mm wide × 275mm deep
1
(3
⁄2in × 91⁄4in × 103⁄4in). Net weight 1.8kg (3 lb, 14 oz).
ACCESSORIES SUPPLIED: Model 1751 Safety Test Leads, instruction
manual.
www.keithley.com
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