/font> or check for previous versions at the Internet Archive. Yahoo! is not affiliated with the authors of this page or responsible for its content.
6634A Series

6634A Series

Temperature Stabilized Resistance Standards

Perfect for Automated Measurement Systems or as a Laboratory Standard


G
UILDLINE
I
NSTRUMENTS
6634A S
ERIES
is a modular series
of Resistance Standards that are rack mountable or simply
set on a bench. The 6634A Series provides a set of precision
resistance standards in a temperature controlled chamber of
30 ± 0.01 °C.

There are 10 standard resistance values covering the range
of 0.1 ohm to 100 Megohm. Each resistance element is
isolated and has a 4-terminal connection at the back panel.
Chamber temperature set points of 35 °C and 40 °C ± 0.01 °C
are available on request. Temperature monitoring is
provided by a precision PRT sensor installed in the chamber
with a 4-terminal connectors on the front panel. The Model
6634A is intended to be used as a Working Standard
Resistance Reference for automated resistance
measurement systems.

Four standard model variations are available with 5, 8, 9 or
10 resistance elements installed. Special values or other sets
of standard resistance values may be ordered.

The 6634A Series is an Excellent Solution as
Working Resistance Standard for Automated
Resistance Measurement Systems or a
Laboratory Primary Resistance Standard!


Resistance elements are electrically isolated and bonded to
an aluminium block to reduce thermal gradients in the inner
chamber. The inner chamber is designed to electrically
shield the individual elements with a guard terminal at the
back panel.

Design of the 6634A reduces thermal bridges between the
control and monitoring circuits and the resistance elements.
The individual resistance element design is based on the
proven Guildline Model 9334 Resistance Standards and
achieves excellent long term stability and low power
coefficients.

Gold plated 5-way binding posts provide for very low
thermal EMF when connected to bare copper cables or gold
plated connections. When used with a low thermal scanner
and automated DCC Resistance Bridge such as the Guildline
Model 6622A Series, full automation of resistance
measurements to 1G ohms is attainable.
Resistance Range: 0.1 to 100 M in
Decades
Temperature Coefficient ± 0.005 ppm/°C
Stabilities as Low as < 2 ppm/year
Models Available For Thermometry
applications
Eliminates Oil Bath Requirements
Ambient Temperature Range: 23°C ± 5°C
Internal PRT Stability: ±0.01°C / year
Custom Internal Temperature Set Points
Temperature Regulation: ± 0.01°C/year
Guarded Resistance Element Chamber
Custom Values / Models Available
CE Marked
Values up to 100 T with Guildline Model
6636
6634A S
ERIES
F
EATURES

6634A Series

of Temperature Stabilized Resistance Standards


6634A Specifications


Nominal
Resistance
(
)
Nominal Initial
Tolerance
1

(± ppm)
Calibration
Uncertainty
2

(±ppm)
24 Hour
Stability
(± ppm)
12 Month
Stability
3

(± ppm)
Temperature
Coefficient
(± ppm/°C)
Maximum
Voltage
(V)
0.1
10 0.5
0.1
3
0.01
0.1
1
10
0.3
0.01
2
0.005
0.32
10
10 0.3
0.01
2
0.005
1.0
100
10
0.35
0.01
2
0.005
3.2
1k
10 0.3
0.01
2
0.005
10
10k
10
0.3
0.01
2
0.005
32
100k
15 1
0.02
2.5
0.01
100
1M
25
6
0.04
3
0.02
320
10M
35 9
0.2
4
0.2
1000
100M
50
15
0.5
15
0.2
1000

Note 1: Nominal initial tolerance is defined as the maximum variation of resistance mean values as initially adjusted at the point of sale.

Note 2: Calibrated in ambient conditions of 23 °C, referred to the unit of resistance as maintained by the National Research Council of Canada or the NIST and
expressed as a total uncertainty with a coverage factor of k = 2. A calibration report stating the measurement values and uncertainty is provided with each unit.

Note 3: Stability is exclusive of the effects of applying power above 20 mW, but not exceeding the maximum voltage, in terms of hysteresis and short term
temperature stabilization.

G
ENERAL
S
PECIFICATIONS


Temperature Stability
± 0.01 °C over 1 year, exclusive of self heating effects of the resistors
Output Resistance Range
0.1
to 100M . (Special values between 0.1 and 100M available at time of order. For higher values
see Guildline 6636 Temperature Stabilized Resistance Standard Series.
PRT Sensor:
1 Year Stability ± 0.01 °C
Resistance 100
± 0.1% at 0°C
0-100°C Temperature Coefficient 0.392
/°C
Power Requirements
100, 120, 220, 240V ± 10%
Frequency: 50/60 Hz ± 10%
15 VA Maximum
Operating
18 °C to 28 °C (64 ~ 80°F), < 70% RH, non-condensing
Environmental:
Storage
-20 °C to 60 °C (-4 ~ 140 °F), < 90% RH, non-condensing
Height Width Depth Weight
Dimensions
132 mm
5.2 in
440 mm
17.4 in
503 mm
19.8 in
11 kg
24 lbs
Note:
Add 10mm (0.4 in) to height for bench top feet


6634A-10
Standard with 10 Decade Elements 0.1 to 100M
6634A-9
Standard with 9 Decade Elements 0.1 to 10M
Guild
line

IS DISTRIBUTED BY
:

6634A-8
Standard with 8 Decade Elements 1 to 10M

6634A-7
Standard with 7 Decade Elements 1 to 1M

6634A-6
Standard with 6 Decade Elements 1 to 100k

6634A-5
Standard with 5 Decade Elements 1 to 10k

Note: Report of Calibration and Calibration Certificate Included (ISO17025 accredited)

6634A/SSRV
Single element substitution of any decade value between 0.1 to 100M

6634A/SPRV
Single element substitution of any special value between 0.1 to 100M

/TM6634A
Technical Manual (Included)
Guildline Instruments Limited
/ST-X
Optional Internal Temperature Set point (Specify 35
°C
or 40
°
C)
21 Gilroy Street, PO Box 99
/Lead-11
Low Thermal Lead Pair w/Gold Plated Banana Plugs, 1M length
Smiths Falls, Ontario
/Lead-12
Low Thermal Lead Pair w/Gold Plated Banana Plugs, 2M length
Canada, K7A 4S9
*Other Precision Leads Available Call and tell us your requirements

Phone: (613) 283-3000

Fax: (613) 283-6082
Optional Calibration Services (Charge)

Web:
www.guildline.com
/Cal
Additional CAL Point (Specify level of power dissipation other than 10mW)
Email:
sales@guildline.com
30555-00-85_B Copyright © 2007.02.27 Guildline Instruments Limited. All rights reserved. Subject to change without notice.