Aemc instruments 1210N, 1250N User Manual

MEGOHMMETER

1210N

1250N

V500V

1kV

				x
					10
	5	2
	0	0		1
MΩ	0	0			00		50	40	600V
											CA
50	2								30
											T
0	0	10					4					20	/
						5								1000V
			100					3							CATI
							200		2						15
								300				5
									400		1.
										500
												600			1
S															(5	(250V
T	®
R
U	MEGOHMMETER														00V )
T
S															)
M
odel			1250N

!

10

(1kV)

E N G L I S H User Manual

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards.

We guarantee that at the time of shipping your instrument has met its published specifications.

An NIST traceable certificate may be requested at the time of purchase, or obtained by returning the instrument to our repair and calibration facility, for a nominal charge.

The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer. For recalibration, please use our calibration services. Refer to our repair and calibration section at www.aemc.com.

Serial #: _ ________________________________

Catalog #: 1326.01 / 1326.02 Model #: 1210 / 1250

Please fill in the appropriate date as indicated:

Date Received: __________________________________

Date Calibration Due: ________________________

Chauvin Arnoux®, Inc. d.b.a AEMC® Instruments

www.aemc.com

Table of Contents

1. INTRODUCTION...................................................................		3
1.1	International Electrical Symbols.....................................................	3
1.2	Definition of Measurement Categories...........................................	4
1.3	Receiving Your Shipment...............................................................	4
1.4	Ordering Information.......................................................................	4
	1.4.1 Accessories and Replacement Parts.................................	4

2. PRODUCT FEATURES...........................................................			5
2.1	Description......................................................................................		5
2.2	Model 1210N Features...................................................................		6
2.3	Model 1250N	Features...................................................................	6
2.4	Model 1210N	Control Features......................................................	7
2.5	Model 1250N	Control Features......................................................	8
2.6	1210N and 1250N Control Features...............................................		9

3. SPECIFICATIONS...............................................................			10
3.1	Model 1210N Specifications.........................................................		10
	3.1.1	Electrical Specifications...................................................	10
	3.1.2	Mechanical Specifications................................................	11
	3.1.3	Safety Specifications........................................................	11
3.2	Model 1250N Specifications.........................................................		12
	3.2.1	Electrical Specifications...................................................	12
	3.2.2	Mechanical Specifications................................................	12
	3.2.3	Safety Specifications........................................................	13

4. OPERATION........................................................................		14
4.1 Using the Model 1210N................................................................		14
4.1.1	Instrument Ground Terminal.............................................	14
4.1.2	Auto-ranging.....................................................................	14
4.1.3	Safety Check - Voltage Test ............................................	14
4.1.4 Insulation Resistance Testing (MΩ Range)......................		14
4.1.5 Successful Insulation Resistance Testing........................		16
4.1.6 Insulation Measurement — Connections.........................		16
4.1.7 Insulation Resistance Measurements on Motors.............		19

4.2 Using the Model 1250N................................................................			21
	4.2.1	Instrument Ground Terminal.............................................	21
	4.2.2	Auto-ranging.....................................................................	21
	4.2.3	Safety Check - Voltage Test ............................................	21
	4.2.4 Utilization of the Guard Terminal......................................		21
	4.2.5 Insulation Resistance Testing (MΩ Range)......................		23
	4.2.6 Successful Insulation Resistance Testing........................		25
	4.2.7	Insulation Measurement - Connections............................	25
	4.2.8 Insulation Resistance Measurements on Motors.............		28
5. MAINTENANCE..................................................................			30
5.1	Warning .......................................................................................		30
5.2	Cleaning.......................................................................................		30
Repair and Calibration.................................................................................			31
Technical and Sales Assistance...................................................................			31
Limited Warranty..........................................................................................			32
Warranty Repairs.		........................................................................................	32

2	Megohmmeter Models 1210N/1250N

CHAPTER 1

INTRODUCTION

Warning

Thesesafetywarningsareprovidedtoensurethesafetyofpersonnel and proper operation of the instrument.

•Read the instruction manual completely and follow all safety information before operating this instrument.

•Safety is the responsibility of the operator!

•Tests are to be carried out only on dead circuits! Check for live circuits before making resistance measurements (safety check).

•The Megohmmeter Models 1210N/1250N are sources of high voltage, as is the sample connected to them. All persons performing or assisting in the tests must employ all safety precautions to prevent electrical shock to themselves and to others.

•AEMC® Instruments considers the use of rubber gloves to be an excellent safety practice even if the equipment is properly operated and correctly grounded.

•When testing capacitance samples, make sure that they have been properly discharged and that they are safe to touch. Dielectric insulation samples should be short-circuited for at least five times the amount of time they were energized.

•Use the leads supplied with the megohmmeter. If defective or used, replace before testing.

1.1International Electrical Symbols

This symbol signifies that the instrument is protected by double or reinforced insulation. Use only specified replacement parts when servicing the instrument.

This symbol on the instrument indicates a WARNING and that the operator must refer to the user manual for instructions before operating the instrument. In this manual, the symbol preceding instructions indicatesthatiftheinstructionsarenotfollowed,bodilyinjury,installation/ sample and product damage may result.

Risk of electric shock. The voltage at the parts marked with this symbol may be dangerous.

Megohmmeter Models 1210N/1250N

3

1.2Definition of Measurement Categories

Cat. I: For measurements on circuits not directly connected to the AC supply wall outlet such as protected secondaries, signal level, and limited energy circuits.

Cat. II: For measurements performed on circuits directly connected to the electrical distribution system. Examples are measurements on household appliances or portable tools.

Cat. III: For measurements performed in the building installation at the distribution level such as on hardwired equipment in fixed installation and circuit breakers.

Cat. IV: For measurements performed at the primary electrical supply (<1000V) such as on primary overcurrent protection devices, ripple control units, or meters.

1.3Receiving Your Shipment

Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify your distributor of any missing items. If the equipment appears to be damaged, file a claim immediately with the carrier and notify your distributor at once, giving a detailed description of any damage. Save the damaged packing container to substantiate your claim. Do not use an instrument that appears to be damaged.

1.4Ordering Information

Megohmmeter Model 1210N..............................................	Cat. #1326.01
Megohmmeter Model 1250N..............................................	Cat. #1326.02

Both models include a carrying strap with lead pouch, three color-coded leads, ground lead, two insulated alligator clips, test probe and user manual.

1.4.1 Accessories and Replacement Parts

Set of 10 fuses, 0.2A, 250V fast-blow 5x20mm...................	Cat. #2973.02
Lead pouch with three color-coded safety leads,	Cat. #1019.01
ground lead, two safety alligator clips and test probe..........
Lead pouch with three color-coded leads,	Cat. #1017.56
ground lead, two alligator clips, and test probe....................

4	Megohmmeter Models 1210N/1250N

CHAPTER 2

PRODUCT FEATURES

2.1Description

TheAEMC® Models 1210N and 1250N are compact, self-contained handcranked megohmmeters. They are practical and dependable instruments designed for a broad range of plant and field service applications, such as acceptance testing and preventive maintenance of wiring, cables, switchgear, and motors. The easy hand-cranked operation provides a steady rectified DC voltage output across the entire range for consistently reliable readings.

These megohmmeters incorporate a built-in, sealed alternator and a constant DC voltage circuit to provide a stable output and give direct insulation resistance reading.

They are ruggedly built and use an O-ring-sealed, cast aluminum case with a polycarbonate front panel designed for harsh, heavy-duty use and protection against dust and water.

The Models 1210N/1250N have a unique auto-ranging feature which expands the scale by x10 and almost doubles the scale length. When the pointer reaches near the end of scale, the auto-ranging feature activates, returning the pointer to the beginning of the scale with the x10 red LED indicator on.

Insulation resistance is indicated with a rugged taut-band meter movement on a logarithmic scale. The indicator scale is easy to read.

Megohmmeter Models 1210N/1250N

5

2.2Model 1210N Features

•Measures insulation at 500V, resistance, continuity

•Test voltage constant across the entire measurement range

•Autoranging MΩ, kΩ and Ω ranges

•Designed for harsh environments: offshore, mining, heavy-duty field, industrial, and military use

•Extra rugged cast aluminum case; O-ring sealed against rain, water, and dust; aluminum lid

•Compact, self-contained package; folding crank

•Large direct-reading scale

•600V test voltage range (safety check)

2.3Model 1250N Features

•Three test voltages: 250, 500, 1000V

•Test voltage constant across the entire measurement range

•Autoranging MΩ ranges

•Designed for harsh environments: offshore, mining, heavy-duty field, industrial, and military use

•Extra rugged cast aluminum case; O-ring sealed against rain, water, and dust; aluminum lid

•Compact, self-contained package, folding crank

•Four terminals including guard and ground

•Large direct-reading scale

•600V test voltage range (safety check)

6	Megohmmeter Models 1210N/1250N

2.4Model 1210N Control Features

			1					2					3
							FUS
10
	x 10		600V CAT II / 1000V CAT I								!
								1
9				2
			3
		4
	10	5														0.
	20					20			30			40				5
			10													(500V)
	Ω
															50
								5	6
	Μ	0			3	4				7						(1mA)
	κΩ			2								8	9
			1											10
								300	400						(5mA)
		Ω	0			200					500
				100									600
			0													! C42
														2
		V

4

5

Ω
M	V

8

Ω

kΩ

® MEGOHMMETER

6

INSTRUMENTS Model 1210N

7

Figure 1

1.Line (-) terminal Black

2.Fuse 0.2A

3.Earth (+) terminal Red

4.Instrument ground terminal for user safety

5.Amber LED illuminates when proper crank speed is attained, indicating presence of selected output

6.Foldaway handle

7.Mechanical zero adjustment screw

8.Range switch - safety test first on MΩ/V range to 500VAC

9.Autoranging: Red LED illuminates when reading needs to be multiplied x10 to obtain the true value (MΩ, kΩ, Ω ranges)

10.Security finger rest isolates users hand from terminals while giving a firm grip during an operation

Megohmmeter Models 1210N/1250N

7

2.5Model 1250N Control Features

				1				2			3
								G
10
x 10				600V CAT II / 1000V CAT I						!
								20	15
9					40	30
				50
		0
50	0											10
	1
200								2	1.5
0					5	4	3					(1kV)
			10
ΜΩ	20						20	300	400		1	(5(250V)
	50
							0			500		00
					100						600
												V)
			0
	V										2	C
												!	42
250V500V				V
		1k
	V								® MEGOHMMETER
8								INSTRUMENTS		Model 1250N

4

5

6

7

Figure 1-A

1.Line (-) terminal - Black

2.Guard terminal - Blue

3.Earth (+) terminal - Red

4.Instrument ground terminal for user safety

5.Green LED illuminates when proper crank speed is attained, indicating presence of selected test voltage

6.Foldaway handle

7.Mechanical zero adjustment screw

8.Range switch - Safety test first on 500 V/V ~ range to 500VAC

9.Autoranging: Red LED illuminates when reading needs to be multiplied x10 to obtain the true value (MΩ range)

10.Security finger rest isolates users hand from terminals while giving a firm grip during an operation

8	Megohmmeter Models 1210N/1250N

2.61210N and 1250N Control Features

11

20

13

14

19

18

17

Figure 2

11. Long, sturdy assembly bolts for tight case

12closing.

12.Instrument ground terminal for enhanced user safety.

13.Rugged taut-band meter movement.

14.Switch slide assembly.

15.Alternator crank shaft, gears and bearings permanently lubricated and sealed.

16.Foldaway crank.

15 17. Die cast aluminum case (cover not shown).

18.O-ring construction seals out dirt and water.

16 19. Simple printed circuit board assembly for easy calibration and maintenance.

20.High impact polycarbonate face plate.

Megohmmeter Models 1210N/1250N

9