OPERATION AND MAINTENANCE MANUAL
FOR SWR AUTOTESTERS AND BRIDGES
1. INTRODUCTION
This manual provides product descriptions and
specifications for ANRITSU Series 59, 63, and 97
SWR Autotesters and Series 58, 60, 62, and 87 SWR
Bridges. It also includes procedures for measuring
the directivity of these co mponents.
2. GENERAL DESCRIPTION
The SWR Autotesters and bridges (Figure 1) are
broadband microwave measurement instruments.
They are used with other test instruments for making fixed- and swept-frequency return loss (SWR)
measurements ov er a wide range of radio frequencies. Return loss measurements are made to check
the performanc e of s ys t ems, subsystems, and mi c rowave components such as amplifiers, directional
couplers, attenuators, filters, splitters, and terminations.
The ANRITSU SWR Autotesters and bridges are
precision-balanced Wheatstone bridges. Except for
the two 4-port comparison-type instruments (Models
59A50 and 58A50) that use an offset termination in
the reference arm, every model has an internal precision reference termination included in one arm of
its bridge. The major difference between the SWR
Autotester and the SWR bridge is that the SWR
Autotester contains a built-in RF detector.
3. PERFORMANCE SPECIFICATIONS
Performance specifications for SWR Autotesters are
listed in Table 1; specifications for SWR bridges are
listed in Table 2.
NOTE: ANRITSU Company was formerly known as WILTRON Com pany.
Figure 1. Typical ANRITSU SWR Autotester and SWR Bridge
490 JARVIS DRIVE ● MORGAN H ILL, CA 95037-2809
P/N: 10100-00008
REVISION : N
PRINTED: OCTOBER 1997
COPYRIGHT 1983 ANRITSU CO.
Table 1. SWR Autotester Performance Specifications
Models
Directivity
(dB)
Accuracy➀
Input Z
(ohms)
Test Port
Connector
59 Series Comparison SWR Autotester, 10 MHz to 18 GHz
59A50 36
0.01–8 GHz:
8–18 GHz:
0.016 ±0.06ρ2 ➁➂
0.016 ±0.1ρ
2
50 GPC–7
63 Series SWR Autotesters, 10 MHz to 4 GHz
63A50
63N50 Type N Male
40➃
0.01 ±0.06ρ
2
50
GPC7
63NF50 Type N Female
97 Series SWR Autotesters, 10 MH z to 18GHz
0.01–8 GHz 8– 18 GHz
97A50 36
97A50-1 40
97S50
35
0.016 ±0.06ρ
0.01 ±0.06ρ
0.018 ±0.08ρ
2
0.016 ±0.1ρ
2
0.01 ±0.1ρ
2
0.018 ±0.12ρ
97SF50 WSMA Female
97S50-1
38
0.013 ±0.08ρ
2
0.013 ±0.12ρ
2
2
2
GPC–7
WSMA Male
50
2
WSMA Male
97SF50-1 WSMA Female
97N50
35
0.018 ±0.08ρ
2
0.018 ±0.12ρ
2
Type N Male
97NF50 Type N Female
Physical
Dimensions:
7.6 x 5.1 x 2.8 cm
(3 x 2 x 1
1
⁄8 in.)
plus connector s
Weight:
340 g (12 oz)
Dimensions:
6.7 x 5.1 x 2.54 cm
5
(2
⁄8 x 2 x 1 in.)
plus connector s
Weight:
340 g (12 oz)
Dimensions:
7.6 x 5.1 x 2.8 cm
1
(3 x 2 x 1
⁄8 in.)
plus connector s
Weight:
340 g (12 oz)
97N50-1
38
0.013 ±0.08ρ
2
0.013 ±0.12ρ
2
Type N Male
97NF50-1 Type N Female
All Models
Insertion Loss (from input to test port): 6.5 dB nominal
Detector Output Polarity: Negative
Output Time Cons tant: 2 µs
Maximum Power Input: 0.5 wat ts (+27 dBm)
Input Connector: Type N Female
Detector Output Connector: BNC Female
➀ Where ρ is the reflection coefficient being measured. Accuracy includes the effects of test port reflections and directivity.
➁ When used with 28A50-1 Precision Termination. The effective directivity of the SWR Aut otester can be increased t o 60 dB by using the
Ripple Extraction return loss measurement technique with the 18A50 Air Line and 29A50-20 Offset Termination.
➂ See paragraph 4 for explanation of accuracy and other terms.
➃ 46 dB directivity available as Option 1. Option 1 accuracy: 0.005 ±0.06ρ2.
2 SWR OMM
Table 2. SWR Bridge Performance Specifications
Models
Directivity
(dB)
Accuracy➀
Input Z
(ohms)
Test Port
Connector
58 Series Comparison SWR Bridge, 2 to 18 GHz
2–3 GHz:
58A50 35
4–18 GHz:
0.018 ±0.32ρ2 ➁ ➂
3–4 GHz:
0.018 ±0.2ρ
0.018 ±0.13ρ2
2
50 GPC–7
60 Series SWR Bridges, 5 MHz to 2 GHz
60A50
60N50 Type N Male
40➃
0.01 ±0.09ρ
2
50
GPC–7
60NF50 Type N Female
62 Series SWR Bridges, 10 MH z to 1GHz
62N75➄
62NF75 75 Type N Femal e
40
0.01 ±0.12ρ
2
75 Type N Male
62B75 75 BNC Male
62BF75 75 BNC Female
87 Series SWR Bridges, 2 to 18 GHz
87A50
87A50-1
35
38
2–3 GHz:
3–4 GHz:
4–18 GHz:
2–3 GHz:
3–4 GHz:
4–18 GHz:
0.018 ±0.32ρ
0.018 ±0.2ρ
0.018 ±0.13ρ2
0.013 ±0.32ρ
0.013 ±0.2ρ
0.013 ±0.13ρ2
2
2
2
2
50 GPC–7
Physical
Dimensions:
6.7 x 5.1 x 2.2 cm
5
(2
⁄8 x 2 x 7⁄8 in.) plus connectors
Weight:
340 g (12 Oz)
Dimensions:
6.7 x 5.1 x 2.54 cm
5
(2
⁄8 x 2 x 1 in.) plus conne ctors
Weight:
340 g (12 oz)
Dimensions:
6.7 x 5.1 x 2.54 cm
5
(2
⁄8 x 2 x 1 in.) plus conne ctors
Weight:
170 g (6 Oz)
Dimensions:
7.3 x 5.1 x 2.86 cm
5
(2
⁄8 x 2 x 1 1⁄8 in.) plus connectors
Weight:
340 g (12 Oz)
All Models
Insertion Loss (from input to test port): 6.5 dB nominal
Maximum Power Input: 0.5 wat ts (+27 dBm)
Input Connector: Type N Female, stainless steel, except 67B and 67F Series that have BNC Female
➀ Where ρ is the reflection coefficient being measured. Accuracy includes the effects of test port refl ections and directivity.
➁ When used with 28A50-1 Precision Termination. The effective directi vity of the bridge can be increased to 60 dB by using the Ripple
Extraction return loss measurement technique with the 18A50 Air Line and 29A50-20 Offset Termination.
➂ See paragraph 4 for explanation of accuracy and other terms.
➃ 46 dB directivity available as Option 1. Option 1 accuracy: 0.005 ±0.09ρ2.
➄ 75Ω Type N Female connectors will withstand occasional mating with 50Ω connectors without damage.
SWR OMM 3
4. EXPLANATION OF SWR
REFERENCE
PLANE
MALE
PIN
DEPTH
(INCHES)
REFERENCE
PLANE
FEMALE
PIN
DEPTH
(INCHES)
0
1
2
3
4
5
1
2
3
4
2
11
2
AUTOTESTER AND BRIDGE
SPECIFICATIONS
Certain key specification terms are explained below.
a. Accuracy. This three-element term defines
the accuracy with which an SWR Autotester or
bridge can make a reflected signal measurement. The three elements (
0.01 ±0.06 ρ2) are
described below.
1st Element: (0.01) is the directivity of the SWR
Autotester or bridge expressed as a reflection
coefficient (40 dB for this example, see Table 6).
2
2nd and 3rd Elem ents: ±0.06
ρ
is the depreciation in accuracy due to test port mismatch (impedance discontinuity). Element 2 (0.06) is the
inherent test port mismatch expressed as a reflection coefficient. The 3rd el ement, rho (ρ), is
the reflection coefficient of the device under test
(DUT). The entire expression describes the
measurement uncertainty caused by the reflected signal being re-reflected by the test port
mismatch.
a. Beware of Destructive Pin Depth on Mating
Connectors. Before mating, measure the pin
depth (Figure 2) of the device that will mate with
the SWR Autotester or bridge, using a ANRITSU
Pin Depth Gaug e (Figur e 3) or equi valent. Based
on SWR Autotesters and bridges returned for
repair, destructive pin depth of mating connectors is the major cause of failure in the field. (A
destructive pin de pth ha s a ce nte r p i n tha t i s t oo
long in respect to the connector’s reference
plane.) When the SWR Autotester or bridge is
mated with a connector having a destructive pin
depth, damage will likely occur to the SWR
Autotester or bridge.
b. Direc tivity. A figure of merit expr essed in dB.
This figure represents the ratio of the power
levels as seen at the output port when (1) the
test port signal is fully reflected, and (2) the test
port is perfectly terminated.
c. Frequency Sensitivity. The maximum varia-
tion in output power/voltage that can be expected due to a change in frequency over the
specified range when the input power is held
constant
d. Output Time Constant. The amount of time
required for the selected output pulse to either
rise from the 10% to the 90% point o r fall from
the 90% to the 10% point on the wave form.
5. PRECAUTIONS
The SWR Autotesters and bridges are high-quality,
precision laboratory instruments and should receive
the same care and respect afforded such instruments. Complying with the following precautions
will guarantee longer component life and less equipment downtime due to connector failure. Also, such
compliance will ensure that SWR Autotester or
bridge failures are not due to misuse or abuse—two
failure modes not covered under the ANRITSU warranty.
Figure 2. N Connector Pin Depth Definition
Figure 3. Pin Depth Gauge
The center pin of SWR Autotester or bridg e c on nectors has a precision tolerance measured in
mils (1/1000 inch). Connectors on test devices
that mate with SWR Autotesters and bridges
may not be precision types and may not have the
proper depth. They must be measured before
mating to ensure suitability. When gauging pin
depth, if the SWR Autotester or bridge connector
measures out of tolerance (Table 3) in the “+”
4 SWR OMM
region of the gauge (F igure 3), the center pin is
too long. Mating under this condition will likely
damage the SWR Autotester or bridge connector.
On the other hand, if the test device connector
measures out of tolerance in the “–” region, the
center pin is too short. While this will not cause
any damage, it will result in a poor connection
and a consequent degradation in performance.
b. Avoid Over Torquing Connectors. Over
torquing connectors is destructive; it may damage the connec tor c ent er pi n. Fin ger-t ight is usually sufficient, especially on Type N connectors.
Should it be necessary to use a wrench to tighten
SMA or WSMA c onnectors , use a to rque w rench
that breaks at 5 inch-pounds. As a general rule,
never use pliers to tighten connectors.
c. Do Not Disturb Teflon Tuning Washers On
Connector Center Pins. The center conduc-
tor on many SWR Autotester or bridge connectors contains a small teflon tuning washer located near the point of mating (interface) (Figure
4). This washer compensates for minor impedance discontinuities at the interface. The
washer’s location is critical to the SWR
Autotester or bridge’s performance. Do not dis-
turb it.
TEFLON WASHER
Table 3. Pin-Depth Tolerance, SWR
Autotesters and Bridges
Series
58, 59,
87,
1
97
58, 59,
87, 97
97 TEST – N 207 – 0 .0 00
60, 63 INPUT – NF 207 +0. 000
60 OUTPUT – NF
60, 63 TEST – A +0.000
62 INPUT – NF 207 +0.000
62 TEST – N 207 – 0 .0 00
Port/
Conn. Type
INPUT – NF 207 + 0 .000
OUTPUT – NF 207 +0.000
TEST – A +0.000
TEST – NF 207 +0.000
TEST – S
TEST – SF
TEST – N 207 +0.000
TEST – NF 207 +0.000
OUTPUT – NF
TEST – NF 207 +0.000
2
2
Pin Depth
(MILS)
–0.010
–0.010
–0.003
+0.003
–0.003
–0.0025
–0.0035
–0.0003
–0.0007
–0.020
–0.003
+0.003
–0.003
–0.020
+0.018
–0.018
Legends an d Notes
Typical Mode l Number:
Gauge
Reading
Same As
Pin Depth
207 +0.00 0
–0.003
Same As
Pin Depth
N/A
Same As
Pin Depth
207 +0.00 0
–0.003
Same As
Pin Depth
207 +0.00 0
–0.018
Same As
Pin Depth
97SF50
NOTE
The teflon washer is shown on a GPC-7 connec-
Impedance
Connector Type (Test Port
Connector on Bridges and
SWR Autotesters
Impedance
tor. A similar washer may be installed on any
ANRITSU precision connectors.
Figure 4. Tuning Washer on GPC-7 Connector
Connector Type Abbreviations:
N = Type N male
NF = Type N female
A = GPC-7
SWR OMM 5
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