Sanwa CD800a - Digital Multimeter DMM Manual

SAFETY PRECAUTIONS

Before use, read the following safety precautions.
This instruction manual explains how to use your new digital multimeter CD800a safely. Before use, please read this manual thoroughly. After reading it, keep it together with the product for reference to it when necessary.
The instruction given under the heading of "" must be followed to prevent accidental burn or electrical shock.

Explanation of Warning Symbols

The meaning of the symbols used in this manual and attached to the product is as follows.
Very important instruction for safe use.
The warning messages are intended to prevent accidents to operating personnel such as burn and electrical shock.
The caution messages are intended to prevent damage to the instrument.

	Ground
	Diode
	Fuse
	Buzzer
	Capacitance
	Resistance
	Direct current(DC)
Hz	Frequency
%	Duty cycle
	Alternating current(AC)
	Double insulation (Protection ClassⅡ)
	Plus input (Red)
	Minus input (Black)

Warning Instruction for Safe Use

To ensure the meter is used safely, be sure to observe the instruction when using the instrument.

1. Never use meter on the electric circuits that Exceed 3 kVA.
2. Never apply an input signal exceeding the maximum rating input value.
3. Never use meter if the meter or test leads are damaged or broken.
4. Pay special attention when measuring the voltage of AC 30 Vrms(42.4 V peak) or DC 60 V or more to avoid injury.
5. Never use meter for measuring the line connected with equipment (i.e.motors) that generates induced or surge voltage since it may exceed the maximum allowable voltage.
6. Never use uncased meter.
7. Be sure to use a fuse of the specified rating or type. Never use a substitute of the fuse or never make a short circuit of the fuse.
8. When connecting and disconnecting the test leads, first connecting the ground lead(black one). When disconnecting them, the ground lead must be disconnected last.
9. Always keep your fingers behind the finger guards on the probe when making measurements.
10. Be sure to disconnect the test pins from the circuit when changing the function.
11. Before starting measurement, make sure that the function and range are properly set in accordance with the measurement.
12. Never use meter with wet hands or in a damp environment.
13. Never open tester case except when replacing batteries or fuse. Do not attempt any alteration of original specifications.
14. Do not use the device near an item of strong electromagnetic generation or a charged item.
15. o ensure safety and maintain accuracy, calibrate and check the tester at least once a year.
16. The multimeter is for indoor use only.

Overload protections

Function	Input terminals	Maximum rating input value	Maximum overload protection input
V	(Red) (Black)	DC・AC 600 V	DC 600 V AC 600 V or Peak Max 840 V
		Voltage and Current input prohibited
Hz / %		DC・AC 600 V
mA		DC・AC 400 mA	0.5 A / 250 V Fuse

AC voltage is regulated by rms, valus of sinusoidal wave.

APPLICATION AND FEATURES

Applications

This instrument is portable digital multimeter designed for measurement of weak current circuits. It plays an important role in circuitry analysis by using additional functions as well as measurements of small type communication equipment, electrical home appliance, lighting voltage and batteries of various type.

Features

• Sharp contrast LCD with character 17.5 mm high is employed, and unit symbols are displayed on the screen of the LCD.
• Frequency, capacitance and duty cycle measurement function.
• Attachment body cover is used for protection of the meter and as a tilt stand.
• The current function is protected by a fuse.

NAME OF COMPONENT UNITS

DESCRIPTION OF FUNCTIONS

In the case of action or cancel that function as follows, do not turn the function switch in the condition applied input.

Function Switch

Turn this switch, to turn on and off the power and to select the functions of V

SELECT:Measurement Function Select

When the SELECT button is pressed (→), the functions change as follows.

• In the case of V, mA, the modes change as:
• In the case of the modes change:

RANGE:Range Hold

Press the RANGE button momentary to set the manual range mode, then 'AUTO' disappears in the display. In manual range mode, press the button again to step through the ranges. To return to the auto mode, press the button for 1 sec. or more, then 'AUTO' is shown.
Manual mode is not available in , Hz, duty measurement, diode check, cont. buzzer functions.

REL:Relative Mode

Relative zero allows the user to offset the meter consecutive measurements with the displaying reading as the reference value. Press the REL button momentarily to activate and to exit relative zero mode.

HOLD:Data Hold

When the HOLD button is pressed, the display is hold ('DH' is shown on the display). The display will not be changed while the function is active. Press the button again to cancel the function.('DH' on the display disappears.)
DATA HOLD function does not work when measuring frequency.

Hz/%:Frequency and duty cycle select button

Frequency and duty cycle measurement functions are activated alternatively by pressing the button. In the case of the mode change as Hz → %

Auto Power Off

The meter will enter a low power consumption sleep mode automatically to extend battery life after approximately 30 minutes of no function switch or push button operations. To wake up the meter from Auto Power Off, press any buttons momentarily or turn the function switch to the OFF position. Then turn back on again. To disable the Auto Power Off feature, press the SELECT button while turning the function switch on.
Always turn the function switch to the OFF position when the meter is not in use.

MEASUREMENT PROCEDURE

Start-Up Inspection

No display may suggest that a battery be exhausted.

Voltage measurement

DCV / ACV: Maximum rating input value 600 V DC/AC

1. Applications
   DCV: Voltage of the battery and DC circuit are measured.
   ACV: Sine wave AC voltage, such as lighting voltage, is measured.
2. Measuring ranges
   DCV: 5 ranges from 400 mV to 600 V
   ACV: 4 ranges from 4 V to 600 V

3. Measurement procedure
   
   1. Set the FUNCTION switch at "V" and select either DC or AC with the SELECT button.
   2. Apply the red and black test pins to the circuit to measure.
   • For measurement of DCV, apply the black test pin to the negative potential side of the circuit to measure and the red test pin to the positive potential side.
   • For measurement of ACV, apply the red and black test pins to the circuit to measure.
   3. The reading of Voltage is shown on the display.
   4. After measurement, release the red and black test pins from the object measured.
   • Readings are unstable when test leads are opened.
   • Accuracy is guaranteed in the case of sine wave (Bandwidth 40 ~ 400 Hz)
   • 400 mV AC range is not specified.
   • In the manual mode of the ACV function, the CD800a can be set to the 400 mV range and shows an approximate value. But its accuracy is not guaranteed.
   • In the AC 4 V range, a figure of about 3~9 counts will stay on even if no input signal is present. But it is not malfunction.
   • Use Hz/% function for making Hz and duty cycle measurements.

Resistance Measurement

Never apply voltage to the input terminals.

1. Applications
   Resistance of resistors and circuits are measured.
2. Measuring ranges
   6 ranges from 400 to 40 M.

3. Measurement procedure
   
   1. Set the FUNTION switch at and select with the SELECT button.
   2. Apply the red and black test pins to an object to measure.
   3. The reading is shown in the display.
   4. After measurement, release the red and black test pins from the object measured.
      Note : If measurement is likely to be influenced by noise, shield the object to measure with negative potential (COM). If a finger touches a test pin during measurement, measurement will be influenced by the resistance in the human body, and that results in measurement error. Open Circuit Voltage: <0.4 VDC typical.
   • When the presence of voltage, resistance measurement can not work.

Testing Diode

Never apply voltage to the input terminals.

1. Applications
   The quality of diodes is tested.
2. How to use
   
   1. Set the FUNTION switch at .
   2. Select by pressing the SELECT button.
   3. Apply the black test pins to the cathode of the diode and the red test pin to the anode.
   4. Make sure that the display shows a diode forward voltage drop.
   5. Replace the red and black test pins, make sure that the display is "OL" reading.
   6. After measurement, release the red and black test pins from the object measured.
   • The input terminals open voltage is about 1.5 V

Never apply voltage to the input terminals.

1. Applications
   Checking the continuity of wiring and selecting wires.
2. How to use
   
   1. Set the FUNTION switch at .
   2. Select by pressing the SELECT button.
   3. Apply the red and black test pins to a circuit or conductor to measure.
   4. The continuity can be judged by whether the buzzer sounds or not.
   5. After measurement, release the red and black test pins from the object measured.
   • Threshold: 10~120

Capacitance Measurement

Never apply voltage to the input terminals.

1. Discharge the capacitance before measurement.
2. This is not suitable for measurement of electrolytic condenser such as a large leakage condenser.
3. It takes a while to measure large capacitance.

1. Applications
   Measures capacitance of low leakage condenser such as film condenser.
2. Measuring ranges
   5 ranges from 50.00 nF to 100.0μF (Auto range).

3. Measurement procedure
   

   1. Set the FUNTION switch at .

   2. Select by pressing the SELECT button.

   3. Press the REL button for zero setting (00.00 nF). ④ Apply the red and black test pins to a conductor to measure.

   4. Read the value on the display.

   5. After measurement, release the red and black test pins from the object measured.

   • Manual range is not available in capacitance measurement.

   • Readings are unstable because of stray capacitance in test leads or noise.

Hz / % Measurements ( Hz / % )

Never apply an input signal exceeding the maximum rating input value.

1. Applications
   Measures frequency and duty of any circuit.
2. Measuring ranges
   6 ranges from 5 Hz to 100 kHz (Auto range) Duty Cycle: 20%~80 %
3. Measurement procedure
   
   1. Set the function switch at Hz / % function.
   2. Select Hz by pressing Hz/% selection button.
   3. Apply the red and black test pins to a conductor to measure.
   4. Read the value on the display.
   5. After measurement, release the red and black test pins from the object measured.
   • HOLD function does not work in Frequency measurement function.

Current Measurement

1. Never apply voltage to the input terminals.
2. Be sure to make a series connection via load.
3. Do not apply an input exceeding the maximum rated current to the input terminals.
4. Before starting measurement, turn OFF the power switch of the circuit to separate the measuring part, and then connect the test leads firmly.

• DCmA:Maximum rating input value 400 mADC
• ACmA:Maximum rating input value 400 mAAC

1. Applications
   DCA:Current in batteries and DC circuits is measured.
   ACA:Current in AC circuits is measured.
2. Measuring ranges
   DC/ACmA:2 ranges for 400.0 mA and 40.00 mA.
3. Measurement procedure
   
   1. Set the function switch at "mA" and select either DC or AC with the SELECT button.
   2. In the circuit to measure and apply the red and black test pins in series with load.
   • For measurement of DCA, apply the black test pin to the negative potential side of the circuit to measure and the red test pin to the positive potential side in series with load.
   • For measurement of ACV, apply the red and black test pins to the circuit to measure in series with load.
   3. Read the value on the display.
   4. After measurement, remove the red and black test pins from the circuit measured.
   • Use Hz/% function for making Hz and duty cycle measurements.

MAINTENANCE

Maintenance and inspection

1. Appearance

• Is the appearance not damaged by falling?

2. Test leads

• Is the cord of the test leads not damaged?
• Is the core wire not exposed at any place of the test leads? Note: If the built-in fuse is blown, only the current measurement becomes impossible.
  Note:Make sure that the test leads are not cut.

Calibration

The manufacturer may conduct the calibration and inspection. For more information, please contact the dealers.

Battery and Fuse Replacement

1. If the rear case or the battery lid is removed with input applied to the input terminals, you may get electrical shock. Before starting the work, always make sure that no input is applied.
2. Before starting the work, be sure to turn OFF the main unit power and release the test leads from the circuit.
3. Be sure to use a fuse of the specified rating or type. Never use a substitute of the fuse or never make a short circuit of the fuse.

1. Remove the battery lid screw with a screwdriver.
2. Take out the battery or fuse and replace it with a new one.
3. Attach the battery lid and fix with the screw.

Set battery with its polarities facing in the correct directions.

Storage

AFTER-SALE SERVICE

Warranty and Provision

Sanwa offers comprehensive warranty services to its end-users and to its product resellers. Under Sanwa's general warranty policy, each instrument is warranted to be free from defects in workmanship or material under normal use for the period of one (1) year from the date of purchase.
This warranty policy is valid within the country of purchase only, and applied only to the product purchased from Sanwa authorized agent or distributor.
Sanwa reserves the right to inspect all warranty claims to determine the extent to which the warranty policy shall apply. This warranty shall not apply to fuses, disposables batteries, or any product or parts, which have been subject to one of the following causes:

Repair

Customers are asked to provide the following information when requesting services:

Please contact Sanwa authorized agent / distributor / service provider, listed in our website, in your country with above information. An instrument sent to Sanwa / agent / distributor without those information will be returned to the customer.

Note:

1. Prior to requesting repair, please check the following: Capacity of the built-in battery, polarity of installation and discontinuity of the test leads.

SANWA Website

http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp

SPECIFICATIONS

General Specification

Measuring	method
Display	3 3/4 digit, 4000 counts
Sampling Rate	Approx.3 times/sec
Range Selection	Auto and Manual ranges (Manual range or Auto renge only)
Over ranging lndication	"OL" mark indication (except AC/DC 600 V ranges)
Polarity Indication	Automatic selection("-" is indicated when negative voltage is inputted.)
Low Battery Indication	Below approx. 2.4 V "" mark indication
Environmental Condition	Operating altitude <2000 m / Pollution degreeⅡ
Operating temperature	5 ℃~40 ℃ humidity range: Maximum 80% RH for temperatures up to 31 ℃ decreasing linearly to 50% RH at 40 ℃
Storage temperature / humidity range	-10 ℃~50 ℃ 70 %R.H. max. No condensation. (remove batteries)
Power Supply	R06×2
AC sensoring	Average sensoring
Battery Life	30 min. (auto power save)
Dimension	L 176 mm×W 104 mm×H 46 mm
Mass	Approx. 340 g
Power consumption	Approx. 7 mW TYP. (at DCV)
Battery life	Approx. 500 hours at DCV
Fuse	0.5 A / 250 V Fast Acting Fuse, Parts number: F1176
Accessories	Instruction manual

Measurement Range and Accuracy

Accuracy assurance range: 23±5 ℃&less than 80% R.H. No Condensation
rdg(reading), dgt(digit)

Function&Range		Accuracy	Input Impedance	Remarks
DCV DC Voltage	400.0 mV	±(0.7 %rdg+3dgt)	≧100 M
	4 0. 0 0 V	±(1.1 %rdg + 3dgt)	Apporx. 11 M
	40.00 V		Approx. 10 M
	400.0 V
	600 V
ACV AC Voltage	4.000 V	±(1.6 %rdg+9dgt)	Approx. 11 MApprox. 11 M	Accuracy in the cace of sin wave 40~400 Hz
	40.00 V	±(1.6 %rdg+5dgt)	Approx. 10 MApprox. 11 M
	400.0 V
	600 V
Resistance	400.0	±(1.5 %rdg+5dgt)	Open voltage: Approx. DC 0.4 V The measurering current changes according to the resistance of the resistor to measure.
	4.000 k	±(1.2 %rdg+5dgt)
	40.00 k
	400.0 k
	4.000 M	±(2.0 %rdg+3dgt)
	40.00 M	±(4.0 %rdg+3dgt)
Capacitance	50.00 nF	±(5.0 %rdg+10dgt)	Auto range only. Accuracy was measured after canceling didplay value by relative key
	500.0 nF
	5.000 μF
	50.00 μF
	100.0 μF.
Hz Frequency	5.000 Hz	±(0.5 %rdg+3dgt)	Auto range only. 1 Hz~1 kHz 4 Vrms~250 Vrms 1 kHz~100 kHz 4 Vrms~20 Vrms
	50.00 Hz
	500.0 Hz
	5.000 kHz
	50.00 kHz
	100.0 kHz
% Duty Cycle	20~80%	±(0.5 %rdg+5dgt)	Auto range only. 5 Hz~60 Hz 3 Vrms~30 Vrms 60 Hz~200 Hz 4.9 Vrms~30 Vrms
DCmA DC Current	40.00 mA	±(2.2 %rdg+5dgt)	Approx. 1 Without resistance of Fase
	400.0 mA
ACmA AC Current	40.00 mA	±(2.8 %rdg+5dgt)	Approx. 1 Without resistance of Fase	Accuracy in the cace of sin wave 40~400 Hz
	400.0 mA
Checking Continuity		Buzzer sounds at less than 10~120 Ω Open voltage: Approx. DC 0.4 V
Testing Diode		Open voltage: Approx. DC 1.5 V

Accuracy calculation
(DCmV) / For example...Measurement 400 mVDC Range.
Display value: 100.0[mV]
Accuracy: 400.0[mV]
Range...±(0.3 %rdg+4dgt)
Error: ±(100.0[mV]×0.3 %rdg+4dgt)=±0.7[mV]
Calculation: 100.0[mV]±(100.0[mV]×0.3 %rdg+4dgt)
True value: ln a range of 099.3[mV]~100.7[mV]
400.0[mV]
4[dgt] in the 400.0[mV]range correspond to 0.4[mV]