Tegam R1M-A Manual de usuario

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

R1M-A, R1M-AR

MEGOHMMETER

MODEL R1M-A, R1M-AR

Operation and Maintenance Manual

PN# R1M-A-900-01

Publication Date: December 2012

REV. C

REPRODUCTION AND DISTRIBUTION OF THIS TECHNICAL MANUAL IS AUTHORIZED FOR US

GOVERNMENT PURPOSES. TEGAM PROPRIETARY INFORMATION.

NOTE: This User’s Manual was as current as possible when this product was manufactured. However,

products are constantly being updated and improved. To ensure you have the latest documentation, refer

to www.tegam.com

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

TABLE OF CONTENTS

1. INSTRUMENT DESCRIPTION

Purpose ........................................................................ 1-1

Performance Characteristics ............................................ 1-1

Description of Equipment ................................................ 1-2

List of Items Furnished ...................................................1-3

Storage and Shipping Requirements.................................1-3

2. PREPARATION FOR USE AND INSTALLATION

Unpacking and Inspection ............................................... 2-1

Preparation for Use ........................................................ 2-1

Figure 1: Connection Diagram ..................................... 2-3

3. OPERATING INSTRUCTIONS

Pushbutton Functions ..................................................... 3-1

General Theory of Operation ........................................... 3-2

4. PRINCIPLES OF OPERATION

5. MAINTENANCE

Inspection..................................................................... 5-1

Cleaning ....................................................................... 5-1

Test Equipment required for Calibration and Repair ............ 5-1

Performance Verification ................................................. 5-2

Calibration .................................................................... 5-3

Troubleshooting ............................................................. 5-4

Table 2: Fault Symptoms and Repair Actions................. 5-5

Preparation for Shipment ................................................ 5-6

Overhaul Instructions ..................................................... 5-6

Figure 2: Front Panel Controls ..................................... 5-7

Figure 3: Front Panel-Rear View .................................. 5-8

Figure 4: Simplified Block Diagram .............................. 5-9

Figure 5: Power Supply Schematic ............................. 5-10

Figure 6: Power Supply Layout .................................. 5-11

Figure 7a, 7b: Display Board Schematic...................... 5-12

Figure 8: Display Board Parts Layout.......................... 5-14

Figure 9: System (Side View) Layout ......................... 5-15

Table 3, 4, 5, 6: Parts List ........................................ 5-16

Table 7: Vendor Cage Code Directory ......................... 5-19

6. SERVICE INFORMATION

Preparation for Repair or Calibration Service ..................... 6-1

Expedite Repair and Calibration Form ............................... 6-2

Warranty ...................................................................... 6-3

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

1-1

INSTRUMENT DESCRIPTION

SECTION 1

INSTRUMENT DESCRIPTION

INTRODUCTION

1.1 Purpose

The Model RIM-A Megohmmeter is a portable instrument used

to measure high values of resistance. It is enclosed in a

rugged weather-resistant housing designed for severe

industrial and military applications.

The Model RIM-A may be used to measure resistances

between 50 kΩand 10 GΩ with 50 V test voltage, and

between 1 MΩand 200 GΩ with 100 V, 250 V, or 500 V test

voltage.

1.2 Performance Characteristics

This is a digital reading instrument with six resistance ranges

and four test voltage ranges.

Range

Full Scale

(Ω)

Resolution

(Ω)

Test Voltage

(V)

1 M

1 k

10 M

10 k

100,

250,

or 500

100 M

100 k

1 G

1 M

10 G

10 M

100 G

100 M

Table 1: Specifications

Accuracy:

Resistance accuracy on all ranges: ± 5%

Test Voltage accuracy on all ranges: ± 3%

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

1-2

INSTRUMENT DESCRIPTION

1.3 Description of Equipment

Physical: A rugged heavy-duty case is provided to contain

and protect the instrument. When closed, a gasket seals the

lid to protect the instrument against water and dirt while the

instrument is carried through rainstorms or other hazardous

conditions. The lid is secured by two latches. A handle is

provided for portability. A compartment is provided for

storage of test cables and line cord.

Dimensions: 216 mm (8.5”) x 228 mm (9”) x 152 mm (6”).

Weight is 2.3 kg (5 lb). Controls and connectors are of a size

and spacing such that the instrument may be operated while

wearing safety gloves.

Electrical: Input power is from the AC power line (103.5 V to

129 V at 50 Hz or 60 Hz, at less than 1/8 A).

Environmental: This unit will operate over a temperature

range from 0 °C to 50 °C, 75% RH non-condensing, up to

3050 m altitude. Withstand functional shock of 40 G for 11

ms. Vibration: 2 G maximum at 5 Hz to 55 Hz.

Front Panel Controls and Displays (See figure 2)

OHMS RANGE Switch is a rotary six position selector switch

used to step through all six ranges.

TEST VOLTAGE RANGE Switch is a rotary four position selector

switch used to step through all four voltage ranges.

POWER Switch is used to turn the power on or off to the

instrument.

TEST pushbutton is a round sealed switch. This pushbutton

switch turns on the power to the unit. A LED is provided to

indicate that the test voltage is on.

DISPLAY is a 3 ½ digit LCD, displaying readings from 1.999

to 199.9.

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

1-3

INSTRUMENT DESCRIPTION

TEST VOLTAGE Jack is recessed to prevent any accidental

encounter.

Three Binding Posts for connection of test leads are marked

SIG (Signal), GUARD and GND (Ground). Proper connections

to the resistor under test are described in Section 2.2 below.

WARNING

DO NOT TOUCH THE BINDING POSTS WHEN THEY ARE

CONNECTED TO EXTERNAL CIRCUITS. LETHAL

VOLTAGES MAY BE PRESENT AT THESE POSTS.

1.4 List of Items Furnished

1 each Model R1M-A with power cord

2 each test cables, one shielded with two alligator clips

and the other with one alligator clip

1 each R1M-A Instruction Manual

1.5 Storage and Shipping Requirements

Standard precautions which apply to electronic test

instruments should be followed. A hard mechanical

shock, such as from dropping the R1M-A, could damage

the liquid crystal display. Care should be taken to

prevent damage to associated cables.

The R1M-A should be stored in a relatively dust-free

environment.

Temperature: -40 °C to +71 °C.

Relative humidity: 0 to 100%, non-condensing.

Altitude: 4570 m

See Section 5.7 below for shipping requirements.

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

2-1

PREPARATION FOR USE AND INSTALLATION

SECTION 2

PREPARATION FOR USE AND INSTALLATION

2.1 Unpacking and Inspection

Upon receipt, the R1M-A and accessories should be carefully

unpacked and removed from the shipping container.

Separate the units from the packing material and inspect

both the instrument and the accessories for any external

damage.

If any dents, broken, or loose parts are seen, do not use

the equipment. Notify the shipping company immediately

and follow their instructions as to how to proceed.

Check that all items are present. If any items are missing,

notify the shipper if this is a new instrument. If not new,

contact the previous user to locate the missing item(s).

2.2 Preparation for Use

Release the two latches which secure the lid and open the

lid. Remove the power cord and the two test cables which

are stored in the side compartment. If desired, the lid may

then be removed by pushing it to the right.

Set the ‘TEST VOLTAGE’rotary switch to the desired value,

from 50 V to 500 V and set the ‘OHMS RANGE’switch to the

anticipated range.

Note that although the ‘OHMS RANGE’switch is marked from

1 M to 100 G, a 100% over-range capability is built into this

instrument.

Note also, that for resistance values less than 1 MΩ, the only

test voltage that should be used is 50 V. No damage will

occur if a higher voltage is selected, but the readings may

not be accurate. Do not measure resistors less than 50 kΩ

with the R1M-A; it may damage the instrument.

WARNING

SHORTING THE ‘TEST’ and ‘SIGNAL’ LEADS TOGETHER WILL

CAUSE INSTRUMENT DAMAGE.

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

2-2

PREPARATION FOR USE AND INSTALLATION

Power Up

Plug the power cord into a source of AC power (103.5 V to

129 V at 50 Hz or 60 Hz). Check that the other end is

plugged securely into the power input receptacle on the front

panel and turn on the POWER toggle switch.

Connections to DUT

One test cable has a double banana plug at one end and red

and black insulated alligator clips at the other end. This is

the shielded test cable. Connect the red alligator clip to one

end of the resistor under test. Connect the black clip to the

guard circuit, if any. If no guard is available, this clip may be

left floating (it is connected to the cable shield and to the

R1M-A guard circuit at the other end) however, this clip must

not be allowed to make accidental contact with any part of

the external circuit. Plug the dual-banana plug on this cable

into the SIG and GUARD binding posts. Note that the pin

marked GROUND should go into the GUARD binding post. If

there is no guard available and the black alligator clip at the

other end of the test cable is left floating, the operator may

choose to orient the dual banana plug so that the GROUND

pin is NOT plugged into the GUARD binding post. This will

ensure that any accidental contact of the black alligator clip

will cause no problem; however, the cable shield will then be

floating and the signal may be excessively noisy.

The other test cable has a shrouded banana plug on one end

and an insulated alligator clip on the other end. This cable

carries the high voltage output of the R1M-A to the resistor

under test. Connect the alligator clip to the other end of the

resistor under test; then plug the shrouded banana plug into

the recessed (RED) ‘TEST’jack. Please refer to the

connection diagram (figure 1) below.

The shorting link on the GROUND binding post may be

swung around and connected to the GUARD binding post to

ground the R1M-A circuitry. This may be done only if there is

no external voltage with respect to ground on the measured

resistor or guard.

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

2-3

PREPARATION FOR USE AND INSTALLATION

Figure 1: Connection Diagram

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

3-1

OPERATING INSTRUCTIONS

SECTION 3

OPERATING INSTRUCTIONS

The R1M-A is designed for bench-top or field operation. Use

the cables connecting their banana plug terminations to the

appropriate connectors explained in Section 2.2.

WARNING

DO NOT TOUCH ANY ALIGATOR CLIP WHILE DEPRESSING THE

TEST PUSHBUTTON. LETHAL VOLTAGES MAY BE PRESENT ON

THESE CLIPS.

3.1 Rotary Switch Functions

The two rotary switches manually scroll through the six

resistance and four voltage ranges.

Full scale on any range may be described as 2,000 (actually

1,999), since this is a 3 ½ digit meter. If the readings are

exceeding 1,999 counts, step to the next higher range. If the

readings are less than 2,000 counts, step down a range, so

that it will read 1,999 counts, or less. The decimal point is

located automatically for the correct reading.

If the selected range is too low for the value of the resistor

under test, the display will show over-range by showing “1”

on the display. Similarly, the under-range condition is

displayed by showing negative readings on the display. “-1”

is displayed on the display until the test button is pressed.

The POWER switch turns on the power to operate the unit or

turns off the power to the unit. Note that when power is

turned off, it may take several seconds to discharge circuit

capacity to completely blank the display. The black markings

seen have no effect and disappear when power is turned

back on.

WARNING

TAKING RESISTANCE MEASUREMENTS ON A POWERED OR

ENERGIZED COMPONENT COULD CAUSE SERIOUS HARM

TO THE OPERATOR AND/OR DAMAGE THE R1M-A. BE

SURE THE ITEM TO BE MEASURED IS DISCONNECTED

FROM OTHER COMPONENTS AND APPARATUS.

Revised August, 2004

10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110

• [email protected]

3-2

OPERATING INSTRUCTIONS

3.2 General Theory Of Operation

A 2-terminal measurement method is used to determine the

resistance of the item under test. The R1M-A calculates the

resistance of the item under test utilizing Ohm's law and

displays it on a 3 ½ digit display.

To obtain the best accuracy, allow the R1M-A to warm up for

15 to 30 minutes before making measurements. In any case,

a minimum warm-up of 30 seconds is advised.

Depress the TEST pushbutton, which switches on the high

voltage. Note that the red LED will light, indicating that high

voltage is present on the terminal. Allow for a brief settling

time and read the resistance on the digital display. Note that

the operating range of resistance values which may be read

on any given range extends from 5% to 199.9% of the

nominal value of the selected range. Note that readings

greater than 100% will take more time. Thus, the 1 MΩ

range may be used to measure resistors from 50 kΩto

1.999 MΩ. Note that the test voltage must be 50 V for

resistances less than 1 MΩ. If the resistance measured

exceeds the maximum value for the selected range, the

display will show blanks; in that case, set the range switch to

a higher range. If the resistance measured is less than 5% of

the nominal value of the selected range, the display will

show a minus sign; if so, switch to a lower range, since the

readings may be inaccurate.

If readings are noisy, especially at very high values of

resistance, it may be caused by 60 Hz coupled to the test

resistance from the power line. Note that at 100 GΩ, an

extremely small capacitance will couple many volts into the

test resistance from a power line. If so, it may be necessary

to interpose a grounded shield plate or to put the unknown

resistor into a metal box, connected to the GUARD alligator

clip.

To close up the R1M-A, first reattach the lid to the main

case, if it has been removed. Then store the power cord and

test cables in the side compartment.

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