REED ST-333 Instruction Manual Download Page 10

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10

µA DC/AC Current Measurements

1. Insert the black test lead into the negative 

COM

 terminal and the red 

test lead into the positive 

µA

 terminal.

2. Set the function switch to the μA position.
3. Select AC or DC with the MODE button.
4. Remove power from the circuit under test, then open up the circuit at 

the point where you wish to measure current.

5. Touch the black test probe tip to the negative side of the circuit.
6. Touch the red test probe tip to the positive side of the circuit.
7. Apply power to the circuit.
8. Read the current in the display.

Resistance and Continuity Measurements

1. Insert the black test lead into the negative COM terminal and the red 

test lead into the positive terminal.

2. Set the function switch to the

 

 position.

3. Use the multifunction 

MODE

 button to select resistance.

4. Touch the test probe tips across the circuit or component under test. 

 

It is best to disconnect one side of the device under test so the rest of 
the circuit will not interfere with the resistance reading.

5. For Resistance tests, read the resistance on the LCD display.
6. For Continuity tests, if the resistance is < 100Ω, a tone will sound.

Diode Measurements

1. Insert the black test lead banana plug into the negative 

COM

 jack and 

the red test lead banana plug into the positive diode jack.

2. Turn the rotary switch to the

 

position.

3. Press the MODE button until “

” appears in the display.

4. Touch the test probes to the diode under test. Forward voltage will 

 

indicate 0.4V to 0.7V. Reverse voltage will indicate “

OL

”. Shorted 

devices will indicate near 0mV and an open device will indicate “

OL

” 

in both polarities.

Summary of Contents for ST-333

Page 1: ...reedinstruments www com Model ST 335 400A AC Clamp Meter Instruction Manual...

Page 2: ...ns 9 11 AC Current Measurements 9 DC AC Voltage Measurements 9 A DC AC Current Measurements 10 Resistance Continuity Measurements 10 Diode Measurements 10 Capacitence Measurements 11 Frequency or duty...

Page 3: ...eter is not in use Warnings Set function switch to the appropriate position before measuring When measuring volts do not switch to current resistance modes Do not measure current on a circuit whose vo...

Page 4: ...sistance or Continuity tests Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts Other means should be use...

Page 5: ...ution Accuracy of reading DC Current 400 0 A 1 5 3 digits 4000 A AC Current 400 0 A 2 0 5 digits 4000 A 4 000 AAC 2 5 10 digits 40 00 AAC 400 00 AAC 2 0 5 digits DC Voltage 400 0 mVDC 0 8 3 digits 4 0...

Page 6: ...K probe accuracy not included 50 0 to 400 0 C 50 0 to 20 0 C 7 C 20 0 to 400 0 C 3 0 reading 5 C 400 to 1300 C 400 to 1000 C 1000 to1300 C 3 0 reading 5 C 58 0 to 400 0 F 50 0 to 0 F 14 F 0 to 400 0 F...

Page 7: ...fety For indoor use and in accordance with Overvoltage Category II Pollution Degree 2 Category II includes local level appliance portable equipment etc with transient overvoltages less than Overvoltag...

Page 8: ...ions 1 DC Direct Currrent AC Alternating Current 2 Minus Sign 3 4000 Count 0 to 3999 Measurement Reading 4 AUTO AutoRange Mode 5 ZERO ZERO Mode 6 Diode Test Mode 7 Audible Continuity 8 HOLD Data Hold...

Page 9: ...ion switch to the 400A 40A or 4A range If the range of the measured is not known select the higher range first then move to the lower range if necessary 2 Press the trigger to open jaw Fully enclose o...

Page 10: ...terminal 2 Set the function switch to the position 3 Use the multifunction MODE button to select resistance 4 Touch the test probe tips across the circuit or component under test It is best to discon...

Page 11: ...anana plug into the positive V jack 3 Select Hz or duty with the Hz button 4 Touch the test probe tips to the circuit under test 5 Read the frequency on the display Temperature Measurements WARNING To...

Page 12: ...turned on Press the HOLD key again to exit Hold Zero Button For DCA and Capacitance Zero Offset adjustment Manual Ranging The meter turns on in the autoranging mode Press the Range button to go to man...

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