Seaward MTS1A User manual

MTS Range
Operating Instructions
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com

Operating Instructions
MTS Range
1
Limited Warranty & Limitation of Liability
CROPICO guarantees this product for a period of 1 year. The period of
warranty will be effective at the day of delivery.
(c) Copyright 2008
All rights reserved. Nothing from this edition may be multiplied, or made
public in any form or manner, either electronically, mechanically, by
photocopying, recording, or in any manner, without prior written consent
from CROPICO. This also applies to accompanying drawings and
diagrams.
Due to a policy of continuous development CROPICO reserves the right to
alter the equipment specification and description outlined in this
publication without prior notice and no part of this publication shall be
deemed to be part of any contract for the equipment unless specifically
referred to as an inclusion within such contract.

Operating Instructions
MTS Range
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Disposal of Old Product
This product has been designed and manufactured with high quality
materials and components that can be recycled and reused.
When the crossed out wheelie bin symbol is attached to a product it means
the product is covered by the European Directive 2002/96/EC.
Please familiarise yourself with the appropriate local separate collection
system for electrical and electronic products.
Please dispose of this product according to local regulations. Do not
dispose of this product along with normal waste material. The correct
disposal of this product will help prevent potential negative consequences
for the environment and human health.
User Note:
These Operating Instructions are intended for the use of Competent
Personnel.

Operating Instructions
MTS Range
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Contents
Page
Introduction 4
Operation 4
Technical Information 5
Service and Calibration 8
Additional Products from Cropico 9

Operating Instructions
MTS Range
4
Introduction
The MTS1A and MTS2 Milliohmmeter Test Standards are designed for easy
calibration of low resistance ohmmeters and Kelvin/Thompson Bridges.
The MTS3 Milliohmmeter Test Standard is designed for easy calibration of low
resistance ohmmeter type RCP2A.
True four terminal resistance standards are selected using a specially constructed
switch with low thermal contacts for potential selections and low resistance
contacts for current selection.
The resistance standards may be switched between + full scale, true four terminal
zero, and - full scale (current terminals reversed).
Operation
Important Note: If possible, the MTS Range of Test Standards should be
used in a temperature controlled environment
.
NOTES: Always refer to manufacturer’s calibration procedure before
attempting to calibrate an instrument.
When taking measurements, always wait for a steady reading.
The instrument to be calibrated is connected to the current and potential terminals
of the MTS Standard. A chassis connection is also provided, although this is not
required when calibrating Cropico ohmmeters. The only requirement for the current
cables is that they can be used up to 10A. The potential cables should be low
thermal emf leads (preferably pure multi-stranded copper with crimped copper
connections).
Three operating modes are possible as follows:
1. +Full Scale
In this mode, the Standard is connected as follows:
This is the standard configuration for calibrating an instrument for full scale value.
C1
P1
C2
P2
Selected
Resistance
Stan
dard

Operating Instructions
MTS Range
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2.
Zero
In this mode, the Cl and C2 terminals are short circuited, with no current flowing
through the resistance standards. This gives a true four terminal zero
3.
-Full Scale
This facility has been especially designed for calibrating Cropico Ohmmeter type
DO4A and D07. It may, however, be suitable for use with some other makes of
Ohmmeter.
In this mode, the current connections to the resistance standard are reversed as
follows:
The potential terminals remain unchanged, and therefore this mode is unsuitable
for testing Kelvin/Thompson Bridges.
Technical Information
Terminals: 4 mm. binding posts will accept spade tags and 4 mm.
banana plugs. Low thermal emf types are used for the potential
Working Temp: 5 …20 … 40°C
Storage Temp.: 5 ... +50°C
Switches: Special combination switch with low thermal gold/silver contacts for
the potential selection and low resistance contacts for the current selection.
Size: 215x88x250mm. (WHD)
½ 19” Rack 2U High
467 x 374 x 216 mm. packed in card carton.
Mass 2.8 kg. approx. (3.5 kg. packed in card carton)
C2
P1
C1
P2
Resistance
Standard

Operating Instructions
MTS Range
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MILLIOHMMETER TEST STANDAR
D
D TYPE MTS1
A
A
Resistance
Value
(Ohms)
Uncertaint
y
of
adjustment
at 20°C
Dissipated
Max
Watts
Current
Max
Amps
Typical Temp.
Coefficient
15 to 20°C
100 kΩ±0.01% 0.1 1 mA <10 ppm
10 kΩ±0.01% 0.1 3 mA <10 ppm
1 kΩ±0.01% 0.6 25 mA <10 ppm
100 Ω±0.01% 0.6 75 mA <10 ppm
19 Ω±0.01% 0.43 150 mA <10 ppm
10 Ω±0.01% 0.45 212 mA <10 ppm
1.9 Ω±0.01% 0.475 500 mA <10 ppm
1 Ω±0.01% 0.56 750 mA <10 ppm
100 mΩ±0.01% 0.625 2.5 A <10 ppm
10 mΩ±0.01% 0.25 5 A <10 ppm
1 mΩ±0.01% 0.1 10 A <10 ppm
MILLIOHMMETER TEST STANDAR
D
D TYPE MTS2
Resistance
Value
(Ohms)
Uncertaint
y
of
adjustment
at 20°C
Dissipated
Max
Watts
Current
Max
Amps
Typical
Temp.
Coefficient
15 to 20°C
400 kΩ±0.01% 0.1 0.45 mA <10 ppm
40 kΩ±0.01% 0.1 1.5 mA <10 ppm
4 kΩ±0.01% 0.1 5 mA <10 ppm
400 Ω±0.01% 0.1 15 mA <10 ppm
40 Ω±0.01% 0.1 50 mA <10 ppm
4 Ω±0.01% 0.1 150 mA <10 ppm
400 mΩ±0.01% 0.1 500 mA <10 ppm
40 mΩ±0.01% 0.1 1.5 A <10 ppm
4 mΩ±0.1% 0.4 10 A <10 ppm
400 Ω±0.1% 0.04 10 A <10 ppm
MILLIOHMMETER TEST STANDAR
D
D TYPE MTS3
Resistance
Value
(Ohms)
Uncertaint
y
of
adjustment
at 20°C
Current
Max 2
seconds
Amps
Typical Temp.
Coefficient
15 to 20°C
5 Ω±0.05% 1 A <10 ppm
500 mΩ±0.05% 10 A <10 ppm
50 mΩ±0.05% 10 A <10 ppm
5 mΩ±0.1% 10 A <10 ppm

Operating Instructions
MTS Range
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NOTES
MTS1
A
A & MTS2
The stated currents are for the reference conditions stated. A 25% overload is
permissible for short periods of time.
MTS3
Is designed for calibration of the Microhmmeter type RCP2A the max. current
stated above is only valid for a pulse current as produced by the RCP2A . The
MTS3 is not intended to be used for measurements where a continuous current
is used.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com

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Operating Instructions
MTS Range
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Operating Instructions
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610034 Rev 4