Tenma 72-17175 User manual

Voltage/Current Calibrator
Model: 72-17175

Please read these instructions carefully before use and retain for future reference.
• When using electrical appliances basic safety precautions should always be followed.
• Check the condition before using. If you nd any cracking, breakage, damage or
abnormality, or you consider the device broken, stop using the device immediately
• Do not store or operate the instrument at high temperature and high humidity
environment.
• There are no user-serviceable parts in this product. Refer servicing to qualied
personnel.
• Do not operate the meter or use connection leads if they appear damaged, or if the
meter is not operating properly.
• Remove batteries from devices that will not be used again for a long time.
• Never operate the meter with the cover removed or the battery door open.
• Never dispose of batteries in a re, or attempt to recharge ordinary batteries.
• To prolong battery life, turn off the meter after use.
• Instrument designed for calibrating process devices and measuring process signals.
• Adjustable 1-24mA current source.
• Adjustable -199.9mV to +199.9mV DCV source.
• Current calibrator drives loads up to 500ohms.
• The instrument powers or measures a two wire current loop.
• Four functions to provide the quality and accurate calibration:-
1. Precision current source
2. Measurement of a current signal
3. Power and measurement of two wire loop
4. Precision DC mV source
IMPORTANT SAFETY INFORMATION
WHAT’S INCLUDED
FEATURES
FUNCTIONS
• Calibration instrument
• Storage case.
• Interface cables.
• Instruction manual.
• 9V Battery
Display LCD display, max count 1999
Function
1. Current source
2. Current measurement
3. Power and current measurement
4. DC mV source
Sampling time Approx 0.4 sec
Over input indication “1” displayed on LCD
Operating environment 0oC to 50oC (32oF to 122oF) at <70% relative humidity

ELECTRICAL SPECIFICATIONS
Current Source
Range Display resolution Accuracy
0-19.99mA 0.01mA ±(0.25%FS+1d)
0-24mA 0.1m A ±(0.5%FS+1d)
* Output 0 to 24mA current for loads up to 500ohms
* Output >20mA current for loads up to 400ohms
* FS: full scale
Current Measurement
Range Display resolution Accuracy
0-19.99mA 0.01mA ±(0.25%FS+1d)
0-24mA 0.1m A ±(0.5%FS+1d)
* FS: full scale
Power and Current Measurement of Two Wire Loop
Range Display resolution Accuracy
0-19.99mA 0.01mA ±(0.25%FS+1d)
0-24mA 0.1m A ±(0.5%FS+1d)
* Provides power DC 12V ±2V to the loop and measures current.
* FS: full scale
DC mV source
Range Display resolution Accuracy
-199.9mV to
+199.9mV 0.1mV ±(0.25%FS+1d)
* Output measured load impedance should >1K ohm.
* FS: full scale.
Note: the above specications are tested under the environment RF eld strength less
than 3V/M and frequency less than 30MHz.
MEASURING PROCEDURE
Current Source
• Insert the black test lead into the negative (COM) jack and the red test lead into the
positive (mV-mA) jack.
• Set the function switch to current (mA source) position.
• Press the 0-19.9mA button to set the 0.01mA display resolution (max display is
19.99mA) or press the 0-24mA button to set the 0.1mA display resolution.
• Adjust the calibration rotary control (CAL ADJUST) to generate the current output.
Current Measurement
• Insert the black test lead into the negative (COM) jack and the red test lead into the
positive (mV-mA) jack.
• Set the function switch to current (mA measure) position.
• Press the 0-19.9mA button to set the 0.01mA display resolution (max display is
19.99mA) or press the 0-24mA button to set the 0.1mA display resolution.

INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF
ELECTRICAL & ELECTRONIC EQUIPMENT
These symbols indicate that separate collection of Waste Electrical and Electronic Equipment
(WEEE) or waste batteries is required. Do not dispose of these items with general household
waste. Separate for the treatment, recovery and recycling of the materials used. Waste
batteries can be returned to any waste battery recycling point which are provided by most
battery retailers. Contact your local authority for details of the battery and WEEE recycling
schemes available in your area. Made in China. PR2 9PP
Man Rev 1.0
SPECIFICATIONS
Power supply DC 9V NEDA1604 / 6F22 / PP9 battery or equivalent
alkaline or heavy duty
Power consumption
Current measurement approx DC 12mA
Power and current measurement approx DC 33mA
Current source (under 10mA signal output) approx DC 33mA
DC mV source (under 100mV signal output) approx DC 12mA
Dimensions HxWxD 150 x 70 x 40mm
Weight Approx 232g (inc battery)
MAINTENANCE
BATTERY REPLACEMENT
Cleaning the casing
• Wipe using a damp cloth or sponge. Do not use solvents as these may damage the casing.
• Disconnect the test leads from the meter before opening the battery cover.
• When LCD display show the “ BAT “ marker, it is necessary to replace the battery.
However, measurement may still be made after low battery indicator appears although
accuracy cannot be guaranteed.
• Remove the screw and lift off the battery cover away from the instrument and remove
the battery.
• Replace with a new 9V battery and ret the cover and tighten the screw.
• Remove power from the circuit under test then apply the black test probe to the negative
and the red probe to the positive open circuit and read off the value on the display.
Power and current measurement of two wire loop
• Insert the black test lead into the negative (COM) jack and the red test lead into the
positive (mV-mA) jack.
• Set the function switch to power (Power/mA) position.
• Press the 0-19.9mA button to set the 0.01mA display resolution (max display is
19.99mA) or press the 0-24mA button to set the 0.1mA display resolution.
• Apply the black test probe to the negative and the red probe to the positive in series with
the load in which the current is to be measured and read off the value on the display.
DC mV Source
• Insert the black test lead into the negative (COM) jack and the red test lead into the
positive (mV-mA) jack.
• Set the function switch to voltage (mV Source) position.
• Adjust the calibration rotary control (CAL ADJUST) to generate the voltage (mV) output.